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Effect Of Soil Environment And Plant Functional Attributes On Nematode Diversity In Tibetan Alpine Meadows

Posted on:2021-04-22Degree:MasterType:Thesis
Country:ChinaCandidate:Y T WangFull Text:PDF
GTID:2370330647951027Subject:Ecology
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Soil nematodes are key components of soil food web,they play a crucial role in regulating nutrients cycling and energy flow in the ecosystem.Many studies reported the effect of soil environment,plant species richness and microbial diversity on taxonomic diversity and individual abundance of each functional group of soil nematodes.However,less is known about the response of soil nematodes functional diversity to soil environment,plant community functional attributes.In order to understand the interaction between soil nematodes and biotic and abiotic factors,we investigated soil nematodes communities in alpine meadows distributed on four contrasting environmental regimes(terrains: valley floor,northern and southern slopes,and ridge top)in three sites at the Tibetan plateau,to examine the association between soil environmental factors,plant community functional attributes and soil nematodes diversity(taxonomic diversity: nematode richness;nematode Shannon diversity.functional diversity: CWM,community-weighted mean of body-size;FDRao,Rao diversity of body-size;individual abundance of each functional group).The results show that:(1)taxonomic diversity of soil nematodes pronouncedly increases with soil p H,while the functional diversity of soil nematodes is significantly associated with soil fertility(i.e.both CWM and FDRao of body-sizes increase with increasing soil organic matter and nitrogen content,however,CWM and FDrao of bodysize increases with decreasing soil total phosphorus).The abundance of bacterivores and fungivores is significantly higher at valley floor,and the abundance of herbivores and omnivore-predators is lower in ridge top.In general,the abundance of most functional groups increases with increasing soil phosphorous,except omnivorepredators.The abundance of herbivores and omnivore-predators increases with increasing available nitrogen content.(2)Soil nematodes species diversity and functional diversity of body-sizes is no significant correlation with plant species richness,the abundance of bacterivores and fungivores is positively correlated with plant species richness,the abundance of herbivores and omnivore-predators is negatively correlated with plant species richness.Taxonomic diversity of soil nematodes is positively correlated with and leaf nitrogen and plant height of CWM,nematodes richness of taxonomic diversity increases with the increase of plant specific leaf area and plant height of FD,and increases with the decrease of plant leaf phosphorus of FD.Results show that nematode body size-based functional diversity is negatively correlated with plant specific leaf area of FD.More specifically,the abundance of bacterivores is negatively correlated with leaf dry matter content of CWM,and positively correlated with plant specific leaf area and height of CWM;the abundance of fungivores is negatively correlated with leaf nitrogen of CWM;there's no significant correlation between the abundance of herbivores and omnivorepredators with plant community-weight mean;the abundance of bacterivores increases with increasing plant specific leaf area and height of FD,but decreases with the increasing leaf phosphorus and nitrogen of FD;abundance of fungivores increase with the increasing plant specific leaf area of FD;the abundance of herbivores and omnivorepredators is not correlated with plant functional diversity.This paper emphasized the soil nematode diversity was closely related to soil environmental factors and plant community functional attributes,and taxonomic and functional diversity of soil nematodes were affected by different soil environmental factors and plant community functional attributes.The study providing new insight into understanding of community assembly of soil animals in Tibetan alpine meadows.
Keywords/Search Tags:alpine meadow, soil nematodes diversity, soil nematodes functional diversity, soil environment, plant community functional attributes
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