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The response of ecosystem carbon and nitrogen pools to experimental warming in grasslands: a meta-analysis

Journal of Plant Ecology 2022年第4期15卷 733-742页

作者： Junliang Zou Juying Wu Bruce Osborne Yiqi Luo Beijing Research&Development Centre for Grass and Environment Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China UCD School of Biology and Environmental Science and UCD Earth Institute University College DublinBelfeldDublin 4Ireland Center for Ecosystem Science and Society Department of Biological SciencesNorthern Arizona UniversityFlagstaffAZUSA

carbon(C)and nitrogen(N)coupling processes in terrestrial ecosystems have the potential to modify the sensitivity of the global C cycle to climate *** the degree to which C–N interactions contribute to the sequestration of terrestrial ecosystem C(C_(seq)),both now and in the future,remains *** this study,we used a meta-analysis to quantitatively synthesize C and N responses from feld experiments on grasslands subjected to simulated warming and assessed the relative importance of three properties(changes in ecosystem N amount,redistribution of N among soil,litter and vegetation,and modifcations in the C:N ratio)associated with grassland C_(seq) in response to *** increased soil,litter and vegetation C:N ratios and approximately 2%of N shifted from the soil to vegetation and ***-induced grassland C_(seq) was the result of the net balance between increases in vegetation and litter C(111.2 g·m^(−2))and decreases in soil C(30.0 g·m^(−2)).Warming-induced accumulation of C stocks in grassland ecosystems indicated that the three processes examined were the main contributors to C_(seq),with the changes in C:N ratios in soil,litter and vegetation as the major contributors,followed by N redistribution,whilst a decrease in total N had a negative effect on C_(seq).These results indicate that elevated temperatures have a signifcant infuence on grassland C and N stocks and their coupling processes,suggesting that ecological models need to include C–N interactions for more accurate predictions of future terrestrial C storage.

关键词： climate change carbon sequestration carbon–nitrogen interactions grasslands nitrogen limitation stoichiometry

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