生态学报2018，Vol.38Issue(10)：3616-3627,12.DOI:10.5846/stxb201704170689
氮添加对贝加尔针茅草原土壤线虫群落特征的影响
Effects of nitrogen addition on soil nematode community characteristics in Stipa baicalensis steppe
摘要
Abstract
The community characteristics of soil nematodes in a Stipa baicalensis steppe in Inner Mongolia under different nitrogen treatments (0,15,30,50,100,150,200,300 kg N hm-2 a-1) were studied by field investigation and sample analysis using the morphological classification method.In total,52 genera were identified in all the samples.The dominant species were Helicotylenchus,Acrobeles,and Aphelenchus.Soil nematodes showed an obvious surface convergence phenomenon,and their relative density was not significant.Based on the functional groups,the addition of Bacterivores nematodes and Predators/Omnivores showed a negative correlation with the increase in nitrogen application level.The ecological indices such as abundance (SR),diversity (H'),and evenness (J') of soil nematodes increased with the increase in nitrogen application level,reaching their maximum values at N50.In all treatments,the pathway index was less than 0.75,indicating that fungi decomposed organic matter in the soil.The ecological indicators showed that nitrogen application at ＜ N50 can improve the soil environmental condition and reduce the effects of plant parasites on plant communities and productivity.When the amount of nitrogen applied was ＞N100,the soil pH value decreased significantly,the nitrate nitrogen and ammonium nitrogen contents increased significantly,the soil life history k countermeasures were significantly reduced,and r countermeasures were significantly increased,significantly altering the soil nematode community structure.关键词
贝加尔针茅草原/施氮/土壤线虫/功能指标/生态指数Key words
Stipa baicalensis steppe/nitrogen application/soil nematode/functional index/ecological index引用本文复制引用
张爱林,赵建宁,刘红梅,洪杰,张乃芹,杨殿林..氮添加对贝加尔针茅草原土壤线虫群落特征的影响[J].生态学报,2018,38(10):3616-3627,12.基金项目
国家自然科学基金项目(31170435) （31170435）
