文献类型： 外文期刊

作者： Shi PeiJian ¹ ; Hui Cang ³ ; Men XingYuan ⁴ ; Zhao ZiHua ¹ ; Ouyang Fang ¹ ; Ge Feng ¹ ; Jin XianShi ² ; Cao HaiFeng ¹ ; Li, ¹ ;

作者机构： 1.Chinese Acad Sci, Inst Zool, State Key Lab Integrated Management Pest Insects, Beijing 100101, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Key Lab Sustainable Dev Marine Fisheries, Minist Agr, Qingdao 266071, Peoples R China

3.Univ Stellenbosch, Dept Bot & Zool, Ctr Invas Biol, ZA-7602 Matieland, South Africa

4.Shandong Acad Agr Sci, Inst Plant Protect, Jinan 250100, Peoples R China

5.Univ Calif Rivers

关键词： trophic level;stability;generalized additive model;monoculture;polyculture

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：6.038； 五年影响因子：4.754 ）

ISSN： 1674-7305

年卷期： 2014 年 57 卷 7 期

页码：

收录情况： SCI

摘要： Understanding how plant species richness influences the diversity of herbivorous and predatory/parasitic arthropods is central to community ecology. We explore the effects of crop species richness on the diversity of pest insects and their natural enemies. Using data from a four-year experiment with five levels of crop species richness, we found that crop species richness significantly affected the pest species richness, but there were no significant effects on richness of the pests' natural enemies. In contrast, the species richness of pest insects significantly affected their natural enemies. These findings suggest a cascade effect where trophic interactions are strong between adjacent trophic levels, while the interactions between connected but nonadjacent trophic levels are weakened by the intermediate trophic level. High crop species richness resulted in a more stable arthropod community compared with communities in monoculture crops. Our results highlight the complicated cross-trophic interactions and the crucial role of crop diversity in the food webs of agro-ecosystems.