畜牧与饲料科学 ›› 2020, Vol. 41 ›› Issue (3): 28-34.doi: 10.12160/j.issn.1672-5190.2020.03.006

• 草业科学 • 上一篇    下一篇

短花针茅荒漠草原不同放牧强度土壤线虫群落研究

常虹1, 2, 3, 晔薷罕1, 2, 3, 刘亚红1, 2, 3, 邱晓1, 2, 3, 郝丽芬1, 乌尼尔1, 木兰1, 孙海莲1, 2, 3   

  1. 1.内蒙古自治区农牧业科学院,内蒙古 呼和浩特 010031;
    2.中国科学院内蒙古草业研究中心,内蒙古 呼和浩特 010031;
    3.生态草业可持续发展内蒙古自治区工程研究中心,内蒙古 呼和浩特 010031
  • 收稿日期:2020-03-25 出版日期:2020-05-30 发布日期:2020-06-17
  • 通讯作者: 孙海莲(1972—),女,研究员,博士,主要研究方向为草地生态学。
  • 作者简介:常虹(1983—),女,助理研究员,硕士,主要研究方向为草地生态学。
  • 基金资助:
    内蒙古自治区农牧业科学院青年创新基金项目“荒漠草原不同放牧强度对线虫群落多样性影响研究”(2017QNJJM12);内蒙古科技创新引导项目“内蒙古草原生态恢复技术、生态补偿绩效评估及区域承载分析研究与示范”(KCBJ2018061);2020年中国科学院内蒙古草业研究中心运行经费资助。

Study on Soil Nematode Communities in Plots with Different Grazing Intensities in Stipa breviflora Desert Steppe

CHANG Hong1,2,3,Yeruhan1,2,3,LIU Ya-hong1,2,3,QIU Xiao1,2,3,HAO Li-fen1,Wunier1,Mulan1,SUN Hai-lian1,2,3   

  1. 1.Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China;
    2.Inner Mongolia Prataculture Research Center,Chinese Academy of Sciences,Hohhot 010031,China;
    3.Inner Mongolia Ecological Grass Industry Sustainable Development Engineering Research Center,Hohhot 010031,China
  • Received:2020-03-25 Online:2020-05-30 Published:2020-06-17

摘要: 为探明短花针茅荒漠草原土壤线虫群落分布特征及不同放牧强度对土壤线虫群落的影响,该研究对短花针茅荒漠草原4个不同放牧强度草地的线虫群落进行了系统调查。结果表明:试验区共捕获18属7 200条/100 g干土线虫。拟丽突属、丽突属2个属分别占个体总数的22.78%、41.90%,为该地区的优势类群。多样性分析表明:线虫群落个体数、物种丰富度均为轻度放牧草地大于其余放牧强度草地;群落多样性指数为对照样地>轻度放牧草地>重度放牧草地>中度放牧草地;群落均匀度指数为重度放牧草地>对照样地>(轻度放牧草地=中度放牧草地)。生态指数分析表明:成熟度指数为轻度放牧草地>对照样地>中度放牧草地>重度放牧草地,可见轻度放牧草地和对照样地土壤较稳定,而重度放牧草地土壤受外界活动扰动程度最大;通道指数为中度放牧草地>重度放牧草地>轻度放牧草地>对照样地。此外,通过对不同放牧强度草地植物群落多样性、生物量、盖度、平均高度、枯落物干重、土壤含水量、酸碱度、土壤有机质等环境因子与土壤线虫群落特征指数进行多元逐步回归分析,阐明了放牧条件下影响土壤线虫群落的关键生态变量。研究结果可为确定有益于荒漠草原线虫群落生物多样性维护的放牧强度提供参考。

关键词: 荒漠草原, 放牧强度, 土壤线虫群落

Abstract: In order to investigate the distributive characteristics of soil nematode communities in Stipa breviflora desert steppe and to assess the effects of different grazing intensities on soil nematode communities, a systematic investigation on soil nematode communities in four test plots with different grazing intensities in Stipa breviflora desert steppe was conducted. A total of 7 200 nematodes per 100 g dry soil belonging to 18 genera were obtained in the test areas. The two genera of Acrobeloides and Acrobeles accounted for 22.78% and 41.90% of the total number of individuals, respectively, and they were the dominant genera in this region. Diversity analysis showed that the light grazing plot had higher number of individuals and species richness of nematode communities compared to the other grazing intensity plots. The highest community diversity index was observed in the control plot, followed by the light grazing plot, heavy grazing plot and moderate grazing plot. The community uniformity index was heavy grazing plot > control plot >(light grazing plot = moderate grazing plot). The ecological index analysis revealed that the maturity index was light grazing plot > control plot > moderate grazing plot > heavy grazing plot, indicating that the soil of light grazing plot and control plot was more stable, while that of the heavy grazing plot was mostly prone to be disturbed by external activities. The highest channel index was observed in the moderate grazing plot, followed by the heavy grazing plot, light grazing plot and control plot. Furthermore, via multiple stepwise regression analysis between the environmental factors including plant community diversity, biomass, coverage, average height, dry weight of litter, soil moisture, soil pH value, soil organic matter and other environmental factors of plots with different grazing intensities and the community characteristic indexes, the key ecological variables that affected the soil nematode communities under grazing conditions were determined. Our results provide a reference for determining the grazing intensity that is beneficial to the maintenance of the biodiversity of nematode communities in desert steppe.

Key words: desert steppe;grazing intensity;soil nematode community

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