种植密度对夏播油莎豆光合特征及光响应影响的研究初报

doi:10.3969/j.issn.2096-1197.2019.05.02

Abstract

Abstract: To study the effect of planting density on the photosynthetic characteristics of summer-sown Cyperus esculentus L.at the late tillering stage,and to provide a practical basis for summer-sown Cyperus esculentus L. in the central and western regions of Inner Mongolia.This study systematically analyzed the effect of 2 planting density on the diurnal variation of photosynthesis and the light response curve in the late tillering stage.The results showed that the diurnal variation of net photosynthetic rate and stomatal conductance in the late tillering stage of Cyperus esculentus L. under different planting densities showed a bimodal curve trend.The two peaks of net photosynthetic rate were the highest under the treatment of 125 000 plants/hm²,with the values of 12.16 [μmol/（m²·s）] and 9.49 [μmol/（m²·s）],respectively,which were higher than those under the treatment of 143 000 plants/hm².The photosynthetic rate was 0.25% and 13.93% higher,repsectively.The average stomatal conductance of 125 000 plants/hm² was 0.94% higher than that of 143 000 plants/hm².The intercellular CO₂ concentration showed a single peak curve change trend of first decreasing and then increasing,and the daily average intercellular CO₂ concentration showed a high level of 143 000 plants/hm²>125 000 plants/hm².The transpiration rate showed an inverted "V" type change,and the average daily transpiration rate was 143 000 plants/hm²>125 000 plants/hm².The maximum net photosynthetic rate simulated by the non-rectangular curve was the maximum with the treatment of 125 000 plants/hm² 19.87 [μmol/（m²·s）],which was 4.97% higher than the treatment of 143 000 plants/hm²,and the simulated dark respiration rate of 125 000 strains/hm² was the maximum.The order of light saturation point （LSP） and light compensation point （LCP） was 143 000 plants/hm²>125 000 plants/hm².Based on the comprehensive analysis of the effects of two planting densities on the characteristics of photosynthetic performance changes,the practical basis for summer sowing of Cyperus esculentus L. was provided.It was preliminarily determined that planting density of 125 000 plants/hm² were better for summer sowing of Cyperus esculentus L. in central and western Inner Mongolia.

Key words: Cyperus esculentus L., Planting density, Summer sowing, Diurnal variation of photosynthesis, Light response curve

CLC Number:

S565

ZHANG Xiangqian, FANG Jing, LU Zhanyuan, ZHAO Xiaoqing, REN Yongfeng, SHI Gongfu, CHEN Liyu, CHENG Yuchen, ZHANG Dejian, LIU Zhanyong, LI Yahua. The effect of photosynthesis characteristics and light response of summer planting Cyperus esculentus L. was studied[J].Journal of Northern Agriculture, 2019, 47(5): 9-15.

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The effect of photosynthesis characteristics and light response of summer planting Cyperus esculentus L. was studied

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