Contribution of bacterivorous nematodes to soil resistance and resilience under copper or heat stress
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https://doi.org/10.1007/s42832-020-0045-3
RESEARCH ARTICLE
Contribution of bacterivorous nematodes to soil resistance and resilience under copper or heat stress {
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Xiaoyun Chen1,2, , Wenfeng Xue1, , Jingrong Xue1, Bryan S. Griffiths2, Manqiang Liu1,3 ,* 1 Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China 2 SRUC, Crop and Soil Systems Research Group, West Mains Road, Edinburgh, EH9 3JG, UK 3 Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China
ARTICLE INFO
ABSTRACT
Article history:
The functional performance of soil ecosystems following disturbance determines ecosystem
Received December 10, 2019
stability, and although contributions of bacterivorous nematodes to soil ecosystems are
Revised May 11, 2020 Accepted May 27, 2020
recognized, their roles in functional stability have received little attention. The objective of this study was to evaluate the roles of bacterivorous nematodes in functional stability following
Keywords:
stress. In a factorial laboratory experiment, soil microcosms were prepared with two levels of nematode abundance, either an enriched abundance of bacterivores (Nema soil) or
Stress
background abundance of nematodes (CK soil), and three levels of stress, copper, heat, or
Soil resistant
an unstressed control. The resistance and resilience of nematode abundance, as well as soil
Soil resilience
microbial function by determining decomposition of plant residues and microbial substrate
Bacterivores
utilization pattern using a BIOLOG microplate, were followed post stress. The relative changes
Functional stability
of two dominant bacterivores, Acrobeloides and Protorhabditis, responded differently to stresses. The resistance and resilience of Protorhabditis were greater than that of Acrobeloides to copper stress during the whole incubation period, while both bacterivores only showed higher resilience under heat stress at the end of incubation. The enrichment of bacterivores had no significant effects on the soil microbial resistance but significantly increased its resilience to copper stress. Under heat stress, the positive effect of bacterivores on soil resilience was only evident from 28 days to the end of incubation. The differences in the responses of soil function to stress with or without bacterivores suggested that soil nematodes could be conducive to ecosystem stability, highlighting the soil fauna should be taken into account in soil sustainable management. © Higher Education Press 2020
1 Introduction Soil is one of the most important resources for human activity and, as a part of the global ecosystem, its stability has a significant contribution to the sustainable development of the
* Corresponding author E-mail address: [email protected] (M. Liu) { These authors contributed equally to this work.
Earth resources (Tilman et al., 2002; Brussaard et al., 2007; Nielsen et al., 2015). Soils are under increasing pressures and soil biota particularly i
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