Responses of Soil Nematode Abundance and Diversity to Long-Term Crop Rotations in Tropical China

文献类型： 外文期刊

第一作者： Zhong Shuang

作者： Zhong Shuang;Jim Zhiqiang;Zhong Shuang;Zeng Huicai

作者机构：

关键词： banana;ecological index;nematode community;rotation system;taxon;trophic group

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2015 年 25 卷 6 期

页码：

收录情况： SCI

摘要： A field experiment was carried out from 2003 to 2013 in the Wanzhong Farm of the Hainan Island, China, to determine the effects of two long-term banana rotations on the abundance and trophic groups of soil nematode communities in the island. The experiment was set out as a randomized complete block design with three replications of three treatments: banana-pineapple rotation (AB), banana-papaya rotation (BB) and banana monoculture (CK) in a conventional tillage system. Soil samples were taken at depths of 0-10, 10-20 and 20-30 cm, and nematodes were extracted by a modified cotton-wool filter method and identified to the genus level. Nematode ecological indices of Shannon-Weaver diversity (H'), dominance index (lambda), maturity index (MI), plant parasite index (PPI), structure index (SI), enrichment index (EI), and channel index (CI) were calculated. A total of 28 nematode genera with relative abundance over 0.1% were identified, among which Tylenchus and Paratylenchus in the AB, Thonus in the BB, Tylenchus and Helicotylenchus in the CK were the dominant genera. The rotation soils favored bacterivores, fungivores and omnivores-predators with high colonizer-persister (c-p) values. Soil food web in the rotation systems was highly structured, mature and enriched as indicated by SI, MI and DI values, respectively. Higher abundance of bacterivores and lower values of CI suggested that the soil food web was dominated by a bacterial decomposition pathway in rotation soils. Nematode diversity was much higher after a decade of rotation. Soil depth had significant effects on the abundance of soil nematodes, but only on two nematode ecological indices (lambda and MI).

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