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Nitrogen addition regulates soil nematode community composition through ammonium suppression

Wei, Cunzheng and Zheng, Huifen and Li, Qi and Lü, Xiaotao and Yu, Qiang and Zhang, Haiyang and Chen, Quansheng and He, Nianpeng and Kardol, Paul and Liang, Wenju and Han, Xingguo (2012). Nitrogen addition regulates soil nematode community composition through ammonium suppression. PloS one. 7:8, 1-9
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Official URL: http://dx.doi.org/10.1371/journal.pone.0043384

Abstract

Nitrogen (N) enrichment resulting from anthropogenic activities has greatly changed the composition and functioning of soil communities. Nematodes are one of the most abundant and diverse groups of soil organisms, and they occupy key trophic positions in the soil detritus food web. Nematodes have therefore been proposed as useful indicators for shifts in soil ecosystem functioning under N enrichment. Here, we monitored temporal dynamics of the soil nematode community using a multi-level N addition experiment in an Inner Mongolia grassland. Measurements were made three years after the start of the experiment. We used structural equation modeling (SEM) to explore the mechanisms regulating nematode responses to N enrichment. Across the N enrichment gradient, significant reductions in total nematode abundance, diversity (H' and taxonomic richness), maturity index (MI), and the abundance of root herbivores, fungivores and omnivores-predators were found in August. Root herbivores recovered in September, contributing to the temporal variation of total nematode abundance across the N gradient. Bacterivores showed a hump-shaped relationship with N addition rate, both in August and September. Ammonium concentration was negatively correlated with the abundance of total and herbivorous nematodes in August, but not in September. Ammonium suppression explained 61% of the variation in nematode richness and 43% of the variation in nematode trophic group composition. Ammonium toxicity may occur when herbivorous nematodes feed on root fluid, providing a possible explanation for the negative relationship between herbivorous nematodes and ammonium concentration in August. We found a significantly positive relationship between fungivores and fungal phospholipid fatty acids (PLFA), suggesting bottom-up control of fungivores. No such relationship was found between bacterivorous nematodes and bacterial PLFA. Our findings contribute to the understanding of effects of N enrichment in semiarid grassland on soil nematode trophic groups, and the cascading effects in the detrital soil food web.

Authors/Creators:Wei, Cunzheng and Zheng, Huifen and Li, Qi and Lü, Xiaotao and Yu, Qiang and Zhang, Haiyang and Chen, Quansheng and He, Nianpeng and Kardol, Paul and Liang, Wenju and Han, Xingguo
Title:Nitrogen addition regulates soil nematode community composition through ammonium suppression
Series/Journal:PloS one (1932-6203)
Year of publishing :2012
Volume:7
Number:8
Page range:1-9
Number of Pages:9
Publisher:Public Library of Science
ISSN:1932-6203
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
K Forestry > K11 Forest engineering
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords: anthropogenic activities, soil communities, nematodes , structural equation modeling , soil nematode trophic groups, detrital soil food web, nitrogen enrichment
URN:NBN:urn:nbn:se:slu:epsilon-e-1497
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1497
Additional ID:
Type of IDID
Web of Science (WoS)000308221300013
DOI10.1371/journal.pone.0043384
ID Code:10387
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:17 Jun 2013 09:51
Metadata Last Modified:30 Mar 2015 15:02

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