The relative contributions of intra- and inter-specific variation in driving community stoichiometric responses to nitrogen deposition and mowing in a grassland
| Autor: | Junjie Yang, Xiao-Tao Lü, Shuang-Li Hou, Xingguo Han, Hai-Wei Wei, Zhi-Wei Zhang, Jiang-Xia Yin, Zhuo-Yi Liu, Yan-Yu Hu, Guo-Jiao Yang |
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| Rok vydání: | 2019 |
| Předmět: |
China
Nutrient cycle Biogeochemical cycle Environmental Engineering 010504 meteorology & atmospheric sciences Nitrogen chemistry.chemical_element 010501 environmental sciences 01 natural sciences Grassland Animal science Nutrient Species Specificity Ecological stoichiometry Environmental Chemistry Fertilizers Waste Management and Disposal 0105 earth and related environmental sciences geography geography.geographical_feature_category Phosphorus Plant community Plants Pollution chemistry Cycling |
| Zdroj: | Science of The Total Environment. 666:887-893 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2019.02.322 |
| Popis: | Aims The stoichiometric characteristics of plant communities are important controller for several fundamental ecological processes. The effects of environmental changes on community stoichiometric characteristics are driven by intra- and inter-specific variation. However, the relative importance of both pathways has seldom been empirically examined. Methods We quantified the relative contribution of intra- and inter-specific variation to the changes of community nitrogen (N) and phosphorus (P) concentrations after seven-year factorial N addition and mowing treatments in a semi-arid grassland of northern China. Results Nitrogen addition significantly increased community N and P concentrations and N:P ratio. Mowing significantly increased community N concentration and N:P. Intra-specific variation contributed more than inter-specific variation to the total variability of all the nutritional and stoichiometric characteristics, with intra-specific variation accounting for 68%, 70%, and 75% of the total variation in community-level N, P, and N:P, respectively. Negative covariations between the contribution of intra- and inter-specific variation occurred for community N and P concentrations. Further, N addition and mowing interacted to affect the impacts of intra- and inter-specific variation on community N concentration and N:P stoichiometry. Conclusions Our results highlight different ways of trait selection for N addition and mowing treatments. Interactions between those two factors make it more difficult to accurately predict the responses of plant-mediated biogeochemical cycles under co-occurrence of environmental changes. |
| Databáze: | OpenAIRE |
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