增加降水及施氮对弃耕草地土壤线虫和小型节肢动物的影响  

Effects of water and nitrogen addition on soil nematodes and small arthropods in an oldfield grassland of north China

作　　者：宋敏[1] 

机构地区：[1]河南大学生命科学学院,河南开封475004

出　　处：《生态学杂志》2017年第3期631-639,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31600426)资助

摘　　要：降水格局变化及大气氮沉降对诸多生态过程及功能均有重要影响。然而,目前对于土壤动物对以上两种全球变化趋动因子的响应模式及机制仍缺乏充分认识。本研究利用野外控制试验技术,在中国北方平原弃耕草地生态系统模拟增加降水及大气氮沉降对土壤动物群落的影响。结果表明,增加降水及氮素添加对土壤螨类及跳虫的种群密度均无影响。增加降水使土壤线虫的数量显著增加了14.9%,氮沉降对土壤线虫的数量无影响,但显著增加了群落中食细菌性线虫的数量(45.8%)。本研究表明,土壤线虫对资源有效性及生境微环境变化响应的敏感性强于土壤小节肢动物,且增加降水与氮沉降之间不存在交互作用。Changes in precipitation and nitrogen deposition have profound impacts on ecological processes and functioning. However,the patterns and mechanisms of soil biota response to such changes are poorly understood. A field manipulative experiment was established to examine the responses of soil animal communities to water and nitrogen addition in an old-field grassland ecosystem. Neither water addition nor N deposition affected mite or collembolan abundance. Water addition significantly elevated soil nematode abundance by 14. 9%. Nitrogen addition had little effect on nematode abundance,but significantly increased the abundance of bacterivores by45.8%. Our results indicate that soil nematodes were more sensitive than soil meso-invertebrates to changes in resource availability and microenvironment. In addition,the data indicate that increasing precipitation and N deposition independently affected soil animal community.

关 键 词：降水格局变化 氮沉降 螨虫 跳虫 线虫 

分 类 号：S812[农业科学—草业科学]