Cattle grazing mitigates the negative impacts of nitrogen addition on soil nematode communities
文献类型： 外文期刊
作者： Chen, Ying 1 ; Zhang, Yao 1 ; Nielsen, Uffe N. 2 ; Ma, Quanhui 1 ; Zhang, Xiang 1 ; Huang, Xuewen 3 ; Pan, Duofeng 4 ; Yu 1 ;
作者机构： 1.Northeast Normal Univ, Inst Grassland Sci, Jilin Songnen Grassland Ecosyst Natl Observat & R, Key Lab Vegetat Ecol,Minist Educ, Changchun 130024, Peoples R China
2.Western Sydney Univ, Hawkesbury Inst Environm, Penrith, NSW 1797, Australia
3.Hulunbuir Univ, Sch Life Sci, Hulunbuir 021008, Peoples R China
4.Heilongjiang Acad Agr Sci, Inst Forage & Grassland Sci, Harbin, Peoples R China
关键词： Cattle grazing; Grassland management; Mixed grazing; Nitrogen enrichment; Sheep grazing; Soil nematodes
期刊名称：ECOLOGICAL INDICATORS （ 影响因子：4.958； 五年影响因子：5.846 ）
ISSN： 1470-160X
年卷期： 2021 年 129 卷
页码：
收录情况： SCI
摘要： 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.
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