【Objective】 To clarify the grain-filling characteristics,nutritional quality indexes and heterosis changes of the main maize cultivars from 1970s to 2000s in China,and explore the relationship among the different indexes and the utilization of heterosis of each index,which could be used for the breeding granules and quality and excellent maize new cultivars provide theoretical basis.【Methods】 Field experiments of maize single-cross varieties and their parents in different years were carried out to analyze the relationship among the active grain-filling period,average grain-filling rate,nutritional quality and the heterosis of each index of the main maize cultivars.【Results】 With the advancing of the years,the hundred-grain weight of the main maize cultivars in different years increased significantly（P<0.05）. Compared with the 1970s-1990s,the single-cross varieties in 2000s increased by 6.99%,6.86% and 14.99%,respectively. The heterosis increased significantly,and the grain bulk density increased significantly（P<0.05）. The active grain-filling period and average grain-filling rate of single-cross varieties in 2000s were significantly higher than those of single-cross varieties from 1970s to 1990s（P<0.05）. The heterosis of average grain-filling rate gradually increased with the progress of the years. Path analysis showed that grain starch and crude fat content had a positive direct effect on hundred-grain weight,while crude protein,soluble sugar and lysine content had a negative direct effect on hundred-grain weight. As the years advanced,the content of soluble sugar and crude protein in grains was significantly reduced（P<0.05）,and the content of starch and lysine was significantly increased（P<0.05）. The content of crude fat was the highest in the 1990s single-cross varieties,which was increased by 8.76%,10.41% and 9.94%,respectively,the differences were significant（P<0.05）.【Conclusion】 With the advancing of the years,the hundred-grain weight and grain bulk density of maize single-cross varieties increased significantly,the active grain-filling period and average grain-filling rate increased significantly,the starch and lysine contents of grain increased,the soluble sugar and crude protein contents decreased significantly,and the crude fat content changed in 1990s were significantly higher than 1970s,1980s and 2000s. Heterosis was obvious in hundred-grain weight,active grain-filling period,average grain-filling rate and crude fat.

【Objective】 In order to screen the excellent canola varieties suitable for planting in Hulun Buir Region.【Methods】 Qingza No. 5,the main cultivar in Hulun Buir Region,was used as the control,and the growth period,agronomic characteristics,yield,stress resistance and grain quality of 8 introduced canola varieties（Shuofengyou 067,Shuofengyou 66,Shuofengyou 963,Longyou No. 10,Guanyouza 705,Guanyouza 815,Liyouza 710 and Liyouza 819）were determined. The adaptability of different varieties in Hulun Buir Region was comprehensively evaluated.【Results】 The growth and development of eight introduced canola varieties were generally performing well in Hulun Buir Region. And they were better in lodging resistance,drought resistance,cold resistance,downy mildew resistance and virus resistance. Guanyouza 705 had a growth period of 102 days,with growing in order,strong stress resistance,low erucic acid and glucosinolate contents;the highest yield was 4 049.0 kg/hm²,which was 11.6% higher than that of the control;the oil content was 45.8%,which was 2.3% higher than that of the control.【Conclusion】 Guanyouza 705 had outstanding comprehensive characteristics,and could popularized as a main canola variety in Hulun Buir Region.

【Objective】 To study the effects of water and drought conditions on the photosynthetic characteristics and assimilate accumulation on different oat varieties.【Methods】 Using dry land varieties of oats（Yanke No. 2 and Pin No. 5）and irrigated land varieties of oats（Neiyan No. 5,Bayou No. 9）as the experimental materials,the experiment set up irrigation and dry cultivation conditions to determine the photosynthetic index and assimilation accumulation index of oats,and analyze the changes in photosynthetic characteristics and assimilate accumulation of different oat varieties under different water and drought conditions.【Results】 Under dry farming conditions,the leaf area index and photosynthetic characteristics of the four oat varieties declined to varying degrees compared with irrigation conditions. Among them,the leaf area index of the irrigated land variety Bayou No.9 was reduced by 10.07% in dry farming conditions and 34.99% lower in net photosynthetic rate compared with irrigation conditions;the net photosynthetic rate and photosynthetic potential index of dry land varieties were generally higher than those of irrigated land varieties. Dry land varieties had 15.04% higher leaf soluble sugar content at heading period than irrigated land varieties. Under irrigation conditions,the leaf area index and photosynthetic potential index of irrigated land varieties were higher than that of dry land varieties. The soluble sugar content of stems and leaves of irrigated land varieties in mature period was 27.57% lower than that of dry land varieties.【Conclusion】 The effects of water and drought conditions on the photosynthetic characteristics and material translocation of different oat varieties were significantly different. The leaves of dry land varieties had stronger photosynthetic production and assimilation capacity under dry farming conditions,while the stems and leaves translocate assimilation of irrigated land varieties was stronger than that of dry land varieties under irrigation conditions.

【Objective】 To investigate the effects of nitrogen（N）,phosphorus（P）and potassium（K）fertilizer on grain-filling and oil accumulation of confectionary sunflower.【Methods】 The experiment was carried out in Wuchuan,Inner Mongolia,and five treatment groups were set：FP（farmers used to apply fertilizer）,NE（nutrient experts recommended fertilization）,NE-N（no nitrogen fertilizer）,NE-P（no phosphate fertilizer）and NE-K（no potassium fertilizer）. The dry matter accumulation,crude fat content and fatty acid components in the seeds of confectionary sunflower were determined by regular sampling after flowering.【Results】 The dry matter accumulation in confectionary sunflower seeds showed an S-shaped curve,and reached the maximum at 19-20 days after flowering,then decreased gradually. The dry matter accumulation in NE treatment was higher than that in NE-N,NE-P and NE-K treatment,and the dry matter accumulation at inflection points of NE-N,NE-P and NE-K treatment was 89%,90% and 91% compared with NE treatment. The crude fat content in seeds also showed an S-shaped curve. The crude fat content in seeds under NE treatment was the highest,and the accumulation amount of crude fat at inflection points in NE-N,NE-P and NE-K treatment was 99%,94% and 93% compared with NE treatment. The changes of palmitic acid content and stearic acid content in seeds showed a power curve. Palmitic acid content tended to be stable at 37 days after flowering,accounting for 7%-8% of the total fatty acid content. The stearic acid content tended to be stable 29 days after flowering,accounting for 0.3%-0.5% of the total fatty acid content. Oleic acid content in seeds was low at the beginning of grain-filling,and peaked at 22 days after flowering. Oleic acid content in seeds accounted for 13%-17% of total fatty acid content at harvest time. The linoleic acid content increased from about 50% at the early stage of grain-filling,and accounted for 75%-80% of the total fatty acid content at harvest time.【Conclusion】 The dry matter accumulation and crude fat content of confectionary sunflower seeds showed an S-shaped curve,and the dry matter and crude fat accumulation of confectionary sunflower seeds reached the maximum at 19-20 days and 28-30 days after flowering,respectively. The main component of fatty acids in seeds was linoleic acid,and fertilization had little effect on the fatty acid components.

【Objective】 To clarify the effects of different amendments on soil salinization indexes,sunflower agronomic characteristics and yield in Hetao Irrigation Area,so as to provide a reference for the improvement of saline-alkali soil in this area.【Methods】 Randomized block test was used,4 treatments with no amendment（S1）,900 kg/hm² organic amendment（S2）,4 500 kg/hm² desulfurized gypsum（S3）,900 kg/hm² organic amendment + 4 500 kg/hm² desulfurized gypsum（S4）,comparative analysis of soil salinization indexes and sunflower agronomic characteristics and yield under different amendments.【Results】 The application of amendments reduced the total salt content and pH value of the soil compared with no amendments. The S4 treatment was significantly lower than the S1 treatment（P<0.05）,which decreased by 1.15 g/kg and 0.32,respectively. The application of amendments increased plant height,stem thickness,and disk diameter,and the S4 treatment was significantly higher than the S1 treatment（P<0.05）. The yield,grain weight per tray,and 100-seed weight of S4 treatment were significantly higher than those of S1 treatment（P<0.05）,increasing by 13.92%,21.15 g and 1.48 g respectively. There was no significant difference between S2 and S3 treatments（P>0.05）.【Conclusion】 900 kg/hm² organic amendment + 4 500 kg/hm² desulfurized gypsum had obvious effects on reducing the total salt content and pH value of the soil,promoting sunflower growth and increasing yield. It was a suitable amendment in saline-alkali soil of Hetao Irrigation Area.

【Objective】 To clarify the influence of controlled-release nitrogen fertilizer on the agronomic characteristics and yield of Panicum miliaceum L. in the hilly areas of the Loess Plateau.【Methods】 A randomized block trial design was used to analyze no fertilizer（T0）,urea（TN）,controlled-release nitrogen fertilizer[T1（N 120 kg/hm²）,T2（N 108 kg/hm²）,T3（N 96 kg/hm²）,T4（N 84 kg/hm²）,T5（N 72 kg/hm²）]on the effect of plant height,stem thickness,leaf area per plant and yield of Panicum miliaceum L..【Results】 Compared with the TN treatment,T1 treatment increased the plant height,stem thickness and leaf area per plant in the late growth stage. With the reduction of controlled-release nitrogen fertilizer,the plant height,stem thickness and leaf area per plant of Panicum miliaceum L. all decreased trend. The yield of Panicum miliaceum L. was extremely significantly correlated with leaf area per plant,and significantly correlated with plant height and stem thickness. Fertilization could significantly increase the yield of Panicum miliaceum L. ,which increased by 30.31%-42.92% compared with T0 treatment in two years;with the reduction of controlled-release nitrogen fertilizer,the yield of Panicum miliaceum L. showed a downward trend.【Conclusion】 One-time basal application of controlled-release nitrogen fertilizer with pure nitrogen of 120 kg/hm² was beneficial to the improvement of agronomic characteristics and yield of Panicum miliaceum L. ,and could be used as a feasible controlled-release nitrogen fertilizer application rate for Panicum miliaceum L. planting in the hilly areas of the Loess Plateau.

【Objective】 To improve the organic carbon content of alkalinized soil,and the ability of water and fertilizer conservation in cultivated soil and sustainability of land-use in Hetao Irrigation Area.【Methods】 Taking the lightly alkalinized soil in Hetao Irrigation Area as the research object,five treatments including addition of biochar,addition of cow manure,addition of sheep manure,addition of corn straw and conventional fertilization（control）were set up in the field positioning experiment from 2019 to 2020. The total amount of straw returned to the field in spring was taken as the benchmark,that is,the amount of organic carbon was 2 400 kg/hm². The physicochemical properties and organic carbon density of 0-60 cm soil layer were analyzed.【Results】 Compared with the control group,the pH value of the 0-30 cm soil layer was decreased by 4.4%,the alkalinization degree was decreased by 0.4%,the organic carbon density was increased by 30.9%;and the pH value of 30-60 cm soil layer decreased by 2.3% treated with addition of biochar. Compared with the control group,the available potassium content in 0-30 cm soil layer was increased by 45.2%,the total nitrogen content was increased by 38.0%,the water-stable aggregates larger than 2 mm and 0.25-2 mm were increased by 158.05% and 81.51%,the organic carbon density was increased by 52.4%;and the content of available potassium and available phosphorus in 30-60 cm soil layer was increased by 35.6% and 41.7% respectively treated with addition of cow manure. Compared with the control group,the total nitrogen content in 0-30 cm soil layer was increased by 30.0%,and the water-stable aggregates larger than 2 mm was increased by 357.45%;and the content of available phosphorus in 30-60 cm soil layer was increased by 39.1% treated with addition of sheep manure. Compared with the control group,the water-stable aggregates larger than 2 mm and 0.25-2 mm in 0-30 cm soil layer were increased by 77.62% and 83.01% treated with addition of corn straw.【Conclusion】 Different organic matter had different effects on the physicochemical properties of the slightly alkaliznied soil in Hetao Irrigation Area. The addition of biochar had a good effect on soil salinity and alkalinity improvement. The effect of addition of cow manure and sheep manure on soil physicochemical properties and soil nutrients was better,while the comprehensive effect of applying cow manure on soil physicochemical properties and organic carbon pool was the best,which was conducive to soil water and fertilizer conservation and sustainable production in Hetao Irrigation Area.

【Objective】 To study the effect of fig leaves biochar on wheat seed germination and seedling growth.【Methods】 Using fig leaves as the experimental material,biochar was prepared by burning at 400,500,and 600 ℃ for 6 h,and the morphology structure of biochar was observed by scanning electron microscope. The biochar extracts of fig leaves with concentrations of 2,6,10,20 g/L were prepared,and the effects of different concentrations of fig leaves biochar extracts on wheat seed germination and seedling growth were analyzed.【Results】 High-temperature carbonization treatment of fig leaves biochar could increase its porosity,but its yield decreased as the temperature increasing,while the pH value and ash content increased. The highest yield was 36.21% when the carbonization temperature 400 ℃. With the increase of preparation temperature and use concentration,the wheat seed germination rate decreased. When the concentration of biochar at 600 ℃ was 20 g/L,the germination rate only 55%;low concentration promoted and high concentration inhibited for the growth of wheat sprouts and roots;root-shoot ratio decreased with the increase of biochar concentration. The three types of biochar had a promoting effect on SOD activity of wheat seedling. As the biochar concentration increases,the SOD activity first increased and then decreased. When the concentration of biochar prepared at 600 ℃ was 10 g/L,the highest SOD activity could reach 260 U/mg. The effect of biochar prepared at 500 ℃ and 600 ℃ on POD activity of wheat seedling showed a trend from high to low. When the amount of biochar prepared at 500 ℃ was 2 g/L,the highest POD activity reached 207.6 U/mg.【Conclusion】 The carbonization temperature and use concentration of fig leaves biochar effected the seed germination rate and seedling growth of wheat,and biochar with high carbonization temperature had a significant effect on wheat seed germination and seedling growth. When the concentration was 2-10 g/L,it could promote wheat growth;when the concentration was 20 g/L,it could degrade wheat growth.

【Objective】 To clarify the differences in soil enzyme activity,microbial quantity and community composition under different short-term tillage methods in the irrigation area of Tumedchuan Plain,and provide a theoretical basis for the rational use of tillage methods in this region.【Methods】 The experimentation adopted the regional design;five tillage measures including no tillage（NT）,deep ploughing（DP）,subsoiling（SS）,strip deep rotation（SC）and farmer shallow rotation（CK）were set up;and the differences of soil enzyme activity,microbial quantity,microbial biomass carbon and microbial biomass nitrogen were analyzed;16S rRNA extender sequencing method was used to explore the microbial community composition.【Results】 DP and SS treatments had significant effects on the increase of soil microbial quantity,microbial biomass carbon,microbial biomass nitrogen and soil enzyme activity,and the difference was significant between years（P<0.05）. The composition of soil bacterial community under different tillage methods was similar,but there were significant differences in species abundance（P<0.05）,mainly reflected in Actinobactera，Proteobacteria，Chloroflex and Acidobacteria. Among them，Actinobactera，Chloroflexi and Acidobacteria were the most abundant bacteria in the soil dominant bacteria phyla under DP treatment，and RB41，Bacillus，Sphingomonas and Rubrobacter were the most abundant bacteria genus in SS treatment. DP and SS treatments significantly increased soil catalase activity，sucrase activity，protease activity，microbial quantity，microbial biomass carbon content，and microbial biomass nitrogen content，making Chloroflexi，Firmicutes and Planctomycetes and other bacteria genus such as RB41，Nordella，Bacillus，and Sphingomona increase，promoted material circulation；CK treatment of soil bacterial communities was not sensitive to changes in biological indicators；NT treatment increased Actinobactera and Gaiella，MND1；SC treatment increased Gemmatimonadetes and Sphingomonas.【Conclusion】Both subsoiling treatment and deep plowing treatments could significantly increase soil enzyme activity，microbial biomass and microbial community composition，and then improve soil quality. Among them，subsoiling treatment had the most significant effect，followed by deep plowing treatment.

【Objective】 To obtain antagonistic bacteria with good biocontrol effect on rice blast and explore its control mechanism.【Methods】 The strain 5-8 with better control effect on rice blast was selected from 10 kinds of antagonistic bacteria in seedling stage. The bacteriostatic spectrum was determined by confrontation culture,and the taxonomic status was identified by physiological and biochemical indexes and 16S rDNA gene sequence homology analysis. The antibacterial substances produced by strain 5-8 were identified by PCR amplification and MALDI-TOF MS.【Results】 Strain 5-8 had the best control effect on rice blast,and the control effect could reach more than 90%,and it had a wide antibacterial spectrum and strong antibacterial activity against Sclerotinia sclerotiorum and Monilinia fructicola. 16S rDNA gene sequence homology analysis and physiological and biochemical indexes measurement results showed that strain 5-8 was Bacillus velezensis;the results of PCR amplification of progenin and ituron,combined with MALDI-TOF MS,preliminarily determined that strain 5-8 could produce ituron.【Conclusion】 The strain 5-8 was identified as Bacillus velezensis,which mainly control of rice blast by producing lipopeptide antibiotic ituron.

【Objective】 To screen suitable strawberry varieties for localized seedling raising in Hohhot.【Methods】 From 2018 to 2019,14 introduced strawberry varieties were selected for localized seedling raising by means of survey statistics and sampling determination,and the results of disease resistance,phenological period,fruit characteristics and yield were comprehensive analyzed.【Results】 The reproductive coefficients of different varieties were different,the reproductive coefficients of Baixue Princess and Miaoxiang No. 7 were the highest,reaching 1∶47 and 1∶48 respectively,followed by Baojiao,Pink Princess,Jingzangxiang,Tongzhou Princess and Taoxun,the reproductive coefficient ranged from 1∶30 to 1∶40;and the reproductive coefficients of Suizhu,Hongyan,Ganlu,Zhangji ranged from 1∶20 to 1∶30,the reproductive coefficients of Jingtaoxiang and Christmas Red were less than 1∶20. The plug seedlings were not infected with anthracnose,and some varieties were infected with powdery mildew. Tongzhou Princess and Zhangji were the most susceptible. Hongyan,Jingzangxiang,Zuoheqingxiang and Jingtaoxiang were slightly infected. Christmas Red and Suizhu were very early maturing,Miaoxiang No. 7,Zuoheqingxiang and Baixue Princess were relatively late maturing,and other varieties were early maturing.The soluble solid contents of Jingtaoxiang,Christmas Red and Suizhu were all above 11.00% during the whole fruiting period,the flavor quality was stable and did not decrease with the increase of temperature;the soluble solid contents of Tongzhou Princess and other varieties decreased with the increase of temperature. The yield of Suizhu was the highest,which was 61 612.80 kg/hm² and the yield per plant was 513.44 g;Miaoxiang No. 7 was the second with a yield of 41 303.55 kg/hm² and the yield per plant was 344.20 g;the yield of Baojiao was the lowest,which was 22 952.25 kg/hm².【Conclusion】 Suizhu,Miaoxiang No. 7,Ganlu were suitable for seedling breeding and planting in Hohhot;Baixue Princess,Pink Princess,Baojiao and Taoxun were suitable for seedling breeding in Hohhot;Christmas Red,Jingtaoxiang,Jingzangxiang and Hongyan were suitable for planting in Hohhot.

【Objective】 To establish tissue culture and rapid propagation system of Yishui edible Lilium brownii var. viridulum.【Methods】 The bulbs of Yishui edible Lilium brownii var. viridulum N6 were used as the experimental materials and MS medium was selected as the basic medium,and the tissue culture methods were used to induce buds in different parts of Yishui edible Lilium brownii var. viridulum explants,and the effects of different concentrations of plant growth regulators（6-BA,NAA,IBA）on adventitious bud induction,proliferation and rooting were analyzed and select the most suitable transplanting substrate.【Results】 The scales in the middle of the inner layer bulbs of Yishui edible Lilium brownii var. viridulum were selected as the highest explant induction rate,which was 55.56%,and the pollution rate was lower,which was 40.00%. The best adventitious bud induction medium was 1.0 mg/L NAA+1.0 mg/L 6-BA+MS,the induction rate was 96.67%;the best proliferation medium was 0.1 mg/L NAA+0.5 mg/L 6-BA+MS,the proliferation coefficient was 3.67,its adventitious buds grow in clusters,the seedlings were strong,and the plant growth was the best. The best rooting medium was 0.5 mg/L NAA+0.3 mg/L IBA+MS,the rooting rate was 93.33%,and the roots were strong and thick. The best transplanting substrate was domestic grass charcoal soil+sphagnum moss,the survival rate was 90%,and the average plant height was 7.75 cm.【Conclusion】 The best adventitious bud induction medium for obtaining Yishui edible Lilium brownii var. viridulum scale tissue culture was 1.0 mg/L NAA+1.0 mg/L 6-BA+MS,and the best proliferation medium was 0.1 mg/L NAA+0.5 mg/L 6-BA+MS,the best rooting medium was 0.5 mg/L NAA+0.3 mg/L IBA+MS,and the best transplanting substrate was domestic grass charcoal soil+sphagnum moss.

【Objective】 To explore the changes of endogenous hormones during storage of Helianthus tuberosus L. tubers,and to provide a theoretical basis for the use of hormones to regulate storage dormancy of Helianthus tuberosus L. tubers in production and scientific research.【Methods】 Tubers of Helianthus tuberosus L. cv. Tumet were harvested,dried and stored in shallow cellar covered with sand for 0,30,60,90 and 120 days. The contents of abscisic acid（ABA）,gibberellin（GA₃）and indoleacetic acid（IAA）in tubers of different storage time were determined by ELISA.【Results】 In the process of natural dormancy,the contents of three endogenous hormones in the tubers of Helianthus tuberosus L. changed significantly（P<0.01）compared with that of 0 d storage,and the content of ABA was the highest,followed by GA₃,and the content of IAA was the lowest;with the prolongation of dormancy time,ABA showed a trend of increasing-decreasing-decreasing rapidly,while GA₃ and IAA showed a trend of increasing-decreasing-increasing;GA₃/ABA and IAA/ABA decreased first and then increased,and increased significantly from dormancy release to germination（P<0.01）.【Conclusion】 Before natural dormancy,ABA content in the tubers of Helianthus tuberosus L. was higher. When the dormancy of tuber was released,the contents of GA₃ and IAA increased significantly,which indicated that the high content of growth promoting hormone could promote the germination of buds;the tubers of Helianthus tuberosus L. could be kept intact and plump in sand storage,but the tubers should be transferred to other low temperature environment for further storage when the temperature increased in the later stage.

Thin-shell Carya cathayensis was a deciduous tree belonging to Juglandaceae Carya,which was an excellent landscaping tree species. The paper introduced the current situation of introduction and breeding of thin-shell Carya cathayensis,and the characteristics of six main cultivated varieties：Pawnee,Mahan,Caddo,Wichita,Shoshoni and Jinhua.Three asexual propagation techniques of thin-shell Carya cathayensis including grafting,tissue culture and cutting were reviewed,and the existing problems were analyzed in the research. At the same time,the future research direction of thin-shell Carya cathayensis was prospected in order to provide basis for seedling production and related research of the plant.

【Objective】 Analyze the international trade situation of China′s agricultural products before and after the Sino-US trade friction and the impact of Sino-US trade friction on the international trade of China′s agricultural products,so as to provide references for the long-term stable development of China′s agriculture.【Methods】 Based on the data of China′s agricultural trade volume with the United States,China′s agricultural trade volume,and China′s import volume and transaction volume of major agricultural products from the United States published by the Ministry of Commerce,statistical analysis and literature research methods were used to analyze the situation and structure of international trade import and export of China′s agricultural products.【Results】 Sino-US trade friction had a huge impact on China′s agricultural international trade. On the one hand,China′s imports of major agricultural products in the United States have dropped from 32 855 600 tons of soybeans in 2017 to 16 943 600 tons in 2019,and wheat imports from 1 549 100 tons in 2017 decreased to 361 400 tons in 2018;China′s import transaction volume with the United States dropped from 31.741 billion US dollars in 2017 to 20.523 billion US dollars in 2019. The Sino-US trade friction has posed a certain threat to China′s food security and agricultural market stability;on the other hand,Sino-US trade frictions have prompted China to adjust its foreign trade structure and accelerate the diversified development of agricultural trade.【Conclusion】 By improving the import and export structure of international agricultural products trade,reducing its trade dependence on the United States,developing the EU and Southeast Asian markets,actively exploring new international trade markets and adopting a diversified market structure,China can improve the competitiveness of its own agricultural products while ensuring food security.

【Objective】 To comprehensively understand and analyze the development process of Orthoptera insect taxonomy research,and provide reference for relevant scientific researchers.【Methods】 The data sources were the 1750—2000 Orthopteran insects taxonomy literature entries included in the Bibliographia Systematica Orthopterorum Saltatoriorum and the 2001—2019 Orthopteran insects taxonomy literature entries included in the Orthoptera Species File website,and the EndNote software was used to establish an Orthopteran insects taxonomy literature database,and based on the R language,the statistical analysis was carried out from three aspects：the distribution of annual literature,the amount of articles published by authors,and the amount of articles in source journals.【Results】 The taxonomy research of Orthoptera insects has gone through four development periods：budding period（1750—1778）,initial development period（1779—1829）,slow development period（1830—1947）and rapid development period（1948—2019）. There were a total of 281 core authors,of which 10 were high-yield core authors,and the Chinese entomologist ZHENG Zhemin published the most articles.From the distribution of source journals,a core journal group composed of 14 journals including Zootaxa,Journal of Orthoptera Research,Bulletin de la Société Entomologique de France,Articulata and Entomological News has been formed,among which Zootaxa was the largest number of articles.【Conclusion】 From 1750 to 2019,the number of articles on the taxonomy research of Orthoptera insects showed a fluctuating upward trend. At present,a stable core author group and core journal group have been formed.

【Objective】 The spatiotemporal fusion technology was used to generate high spatiotemporal resolution images,which provides an idea and method for the research of crop type identification.【Methods】 Taking part of the Hetao Irrigation Area（40°10′N-41°25′N,106°23′E-108°47′E）as the study area,based on MODIS and Landsat fusion images,using enhanced adaptive reflectance spatiotemporal fusion model（ESTARFM）,to predict Landsat images and build NDVI time series image data set. Combining the ground sample data,the real image and predicted image data sets were imported into the random forest classifier,and the main crop types in the study area were compared and analyzed.【Results】 The ESTARFM model fusion image had a clearer spatial expression ability,the predicted image and the real image had a better correlation between the bands,and the R value could reach more than 0.6. The overall accuracy of crop type identification using NDVI time series prediction image data set was 93.03%,which was 12.07% higher than the real image accuracy,and the Kappa coefficient was 0.89.【Conclusion】 The ESTARFM model could effectively solve the difficulty of image missing in a specific window period of crops,and provide a better application method for crop type identification research.