Nematode grazing promotes bacterial community dynamics in soil at the aggregate level

ISME Journal - Tập 11 Số 12 - Trang 2705-2717 - 2017
Yuji Jiang1, Manqiang Liu2, Jiabao Zhang1, Yan Chen1, Xiaoyun Chen2, Lijun Chen1, Huixin Li2, Xuexian Zhang3, Bo Sun1
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
2College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China
3Institute of Natural and Mathematical Sciences, Massey University at Albany, Auckland, New Zealand

Tóm tắt

Abstract Nematode predation has important roles in determining bacterial community composition and dynamics, but the extent of the effects remains largely rudimentary, particularly in natural environment settings. Here, we investigated the complex microbial–microfaunal interactions in the rhizosphere of maize grown in red soils, which were derived from four long-term fertilization regimes. Root-free rhizosphere soil samples were separated into three aggregate fractions whereby the abundance and community composition were examined for nematode and total bacterial communities. A functional group of alkaline phosphomonoesterase (ALP) producing bacteria was included to test the hypothesis that nematode grazing may significantly affect specific bacteria-mediated ecological functions, that is, organic phosphate cycling in soil. Results of correlation analysis, structural equation modeling and interaction networks combined with laboratory microcosm experiments consistently indicated that bacterivorous nematodes enhanced bacterial diversity, and the abundance of bacterivores was positively correlated with bacterial biomass, including ALP-producing bacterial abundance. Significantly, such effects were more pronounced in large macroaggregates than in microaggregates. There was a positive correlation between the most dominant bacterivores Protorhabditis and the ALP-producing keystone ‘species’ Mesorhizobium. Taken together, these findings implicate important roles of nematodes in stimulating bacterial dynamics in a spatially dependent manner.

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ISME Journal

Tập 11 Số 12

2705-2717

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