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Effects of crop species richness on the community of soil nematodes in an experimental agro-ecosystem

文献类型： 外文期刊

作者： Lu, Zeng-bin 1 ; Dong, Dao-feng 2 ; Yang, Bing 3 ; Li, Li-li 1 ; Yu, Yi 1 ; Ouyang, Fang 4 ; Ge, Feng 4 ; Verma, Vijay-ch 1 ;

作者机构： 1.Shandong Acad Agr Sci, Inst Plant Protect, 202 North Rd Ind, Jinan 250100, Peoples R China

2.Shandong Acad Agr Sci, Vegetable Res Inst, Jinan 250100, Peoples R China

3.Chinese Acad Sci, Chengdu Inst Biol, Key Lab Mt Ecol Restorat & Bioresource Utilizat, Ecol Restorat Biodivers Conservat Key Lab Sichuan, Chengdu 610041, Peoples R China

4.Chinese Acad Sci, Inst Zool, State Key Lab Integrated Management Pest Insects, Beijing 100101, Peoples R China

5.Texas A&M Univ, Dept Entomol, College Stn, TX 77843 USA

关键词： Crop species diversity;Soil nematodes;Community composition;Crop biomass

期刊名称：EUROPEAN JOURNAL OF SOIL BIOLOGY （ 影响因子：2.846； 五年影响因子：3.618 ）

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收录情况： SCI

摘要： Biodiversity losses in terrestrial ecosystems may negatively affect the functioning of underground ecosystems, especially in trophic interaction networks. These effects have mainly been found in grassland ecosystems. The responses of underground agro-ecosystems to biodiversity loss are largely unknown. Here, the relationships between crop species diversity and the abundance, diversity and functional indices of soil nematodes were examined in a 4-yr field experiment across five crop species richness levels (1, 2, 4, 8, and 16). The relationships between crop biomass and nematode abundance or ecological indices were also tested. Crop species richness had no significant effects on either total abundance nematode, nematode abundance within each trophic group, or nematode ecological indices. However, the plant parasitic nematodes, Psilenchus and Partylenchus, significantly differed among crop species diversity. Crop biomass significantly increased the abundances of total nematodes, plant parasites and omnivores/predators, and decreased that of fungivores. Furthermore, the responses of PPI (Maturity index of plant-parasitic nematode), EI (Enrichment index), and SI (Structure index) to crop biomass were positive, although CI (Channel index) was negatively affected. Redundancy analysis (RDA) further showed that crop species diversity and crop biomass account for 0.7% and 1.9% of the variation in nematode abundance, respectively. Our results clearly indicate that soil nematode abundance and community composition was more affected by crop biomass than by crop species diversity in agricultural systems. (C) 2016 Elsevier Masson SAS. All rights reserved.

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