Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities

Livestock grazing and atmospheric nitrogen (N) deposition have been reported as important factors affecting soil communities. However, how different large herbivore grazing and N addition may interact to affect soil biota in grassland ecosystems is unclear. Nematodes are the most abundant metazoan i...

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Autores principales:	Ying Chen, Yao Zhang, Uffe N. Nielsen, Quanhui Ma, Xiang Zhang, Xuewen Huang, Duofeng Pan, Xiuquan Yue, Jushan Liu, Deli Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Cattle grazing Grassland management Mixed grazing Nitrogen enrichment Sheep grazing Soil nematodes Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/0fc80c4f92b84f54b9545be29aa0f77d
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spelling	oai:doaj.org-article:0fc80c4f92b84f54b9545be29aa0f77d2021-12-01T04:54:54ZCattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities1470-160X10.1016/j.ecolind.2021.107876https://doaj.org/article/0fc80c4f92b84f54b9545be29aa0f77d2021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21005410https://doaj.org/toc/1470-160XLivestock grazing and atmospheric nitrogen (N) deposition have been reported as important factors affecting soil communities. However, how different large herbivore grazing and N addition may interact to affect soil biota in grassland ecosystems is unclear. Nematodes are the most abundant metazoan in soil ecosystems, play critical roles in regulating carbon and nutrient dynamics, and are valuable bioindicators. We examined the independent and interactive effects of grazing regimes (no grazing; sheep grazing; cattle grazing; mixed grazing of sheep and cattle) and N addition (ambient N; N addition) on soil nematodes in a meadow steppe. We found that grazing and N addition interacted to influence total nematode abundance, trophic group abundance, generic richness, diversity and several nematode-based indices (maturity index, channel ratio, enrichment index). In cattle grazing treatment, N addition significantly increased total nematode abundance, and the abundance of bacterial feeders, plant feeders, and omnivore-predators, and generic richness. By contrast, in the sheep and mixed grazing treatments, N addition had a negative effect on the same variables. Moreover, N addition reduced nematode maturity, enrichment and structure indices, and enhanced nematode channel ratio, in most grazing treatments, except mixed grazing where N addition had no effect on these variables. Structural equation modeling (SEM) revealed that N addition indirectly reduced nematode abundance and richness through increased soil NO3−-N content, whereas the effects of grazing were associated with increased relative biomass of grasses. Our results suggested that the response of soil nematodes to N addition strongly depended on herbivore assemblages. Nitrogen addition enhanced soil nematode diversity and maintained a relatively complex and mature soil food web in the presence of cattle rather than sheep grazing. Furthermore, our study highlighted that under N deposition, cattle grazing could benefit the soil nematode community.Ying ChenYao ZhangUffe N. NielsenQuanhui MaXiang ZhangXuewen HuangDuofeng PanXiuquan YueJushan LiuDeli WangElsevierarticleCattle grazingGrassland managementMixed grazingNitrogen enrichmentSheep grazingSoil nematodesEcologyQH540-549.5ENEcological Indicators, Vol 129, Iss , Pp 107876- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Cattle grazing Grassland management Mixed grazing Nitrogen enrichment Sheep grazing Soil nematodes Ecology QH540-549.5
spellingShingle	Cattle grazing Grassland management Mixed grazing Nitrogen enrichment Sheep grazing Soil nematodes Ecology QH540-549.5 Ying Chen Yao Zhang Uffe N. Nielsen Quanhui Ma Xiang Zhang Xuewen Huang Duofeng Pan Xiuquan Yue Jushan Liu Deli Wang Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
description	Livestock grazing and atmospheric nitrogen (N) deposition have been reported as important factors affecting soil communities. However, how different large herbivore grazing and N addition may interact to affect soil biota in grassland ecosystems is unclear. Nematodes are the most abundant metazoan in soil ecosystems, play critical roles in regulating carbon and nutrient dynamics, and are valuable bioindicators. We examined the independent and interactive effects of grazing regimes (no grazing; sheep grazing; cattle grazing; mixed grazing of sheep and cattle) and N addition (ambient N; N addition) on soil nematodes in a meadow steppe. We found that grazing and N addition interacted to influence total nematode abundance, trophic group abundance, generic richness, diversity and several nematode-based indices (maturity index, channel ratio, enrichment index). In cattle grazing treatment, N addition significantly increased total nematode abundance, and the abundance of bacterial feeders, plant feeders, and omnivore-predators, and generic richness. By contrast, in the sheep and mixed grazing treatments, N addition had a negative effect on the same variables. Moreover, N addition reduced nematode maturity, enrichment and structure indices, and enhanced nematode channel ratio, in most grazing treatments, except mixed grazing where N addition had no effect on these variables. Structural equation modeling (SEM) revealed that N addition indirectly reduced nematode abundance and richness through increased soil NO3−-N content, whereas the effects of grazing were associated with increased relative biomass of grasses. Our results suggested that the response of soil nematodes to N addition strongly depended on herbivore assemblages. Nitrogen addition enhanced soil nematode diversity and maintained a relatively complex and mature soil food web in the presence of cattle rather than sheep grazing. Furthermore, our study highlighted that under N deposition, cattle grazing could benefit the soil nematode community.
format	article
author	Ying Chen Yao Zhang Uffe N. Nielsen Quanhui Ma Xiang Zhang Xuewen Huang Duofeng Pan Xiuquan Yue Jushan Liu Deli Wang
author_facet	Ying Chen Yao Zhang Uffe N. Nielsen Quanhui Ma Xiang Zhang Xuewen Huang Duofeng Pan Xiuquan Yue Jushan Liu Deli Wang
author_sort	Ying Chen
title	Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
title_short	Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
title_full	Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
title_fullStr	Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
title_full_unstemmed	Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
title_sort	cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/0fc80c4f92b84f54b9545be29aa0f77d
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Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities

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