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	Litter species traits, but not richness, contribute to carbon and nitrogen dynamics in an alpine meadow on the Tibetan Plateau
	Jiang J. ; Li Y. K. ; Wang M. Z. ; Zhou C. P. ; Cao G. M. ; Shi P. L. ; Song M. H.
	2013
关键词	Litter N content CO2-C emission Net N mineralization Functional diversity Microbial biomass C and N Additive and non-additive effects microbial biomass nitrogen leaf-litter ecosystem function decomposition processes forest ecosystems direct extraction nutrient release plant diversity soil-nitrogen biodiversity
英文摘要	Litter, as afterlife of plants, plays an important role in driving belowground decomposition processes. Here we tested effects of litter species identity and diversity on carbon (C) and nitrogen (N) dynamics during litter decomposition in N-limited alpine meadow soil from the Qinghai-Tibet Plateau. We incubated litters of four meadow species, a sedge ("S", Kobresia humilis), a grass ("G", Elymus nutans), a herb ("H", Saussurea superba), and a legume ("L", Oxytropis falcata), in monoculture and in mixture with meadow soil. CO2 release was measured 21 times during the incubation, and soil available N and microbial biomass C and N were measured before and after the experiment. The organic C decay rate did not differ much among soils amended with monocultures or mixtures of litter, except in the H, S, L, and S+H treatments, which had much higher decay rates. Potential decomposable C pools were lowest in the control, highest in the L treatment, and intermediate in the S treatment. Mineralized N was completely immobilized by soil microbes in all treatments except the control, S+L, and S+G+L treatments. Litter mixtures had both additive and non-additive effects on CO2-C emission (mainly antagonistic effects), net N mineralization (mainly synergistic), and microbial biomass C and N (both). Overall, these parameters were not significantly correlated with litter species richness. Similarly, microbial C or N was not significantly correlated with litter N content or C/N. However, cumulative CO2-C emission and net N mineralization were positively correlated with litter N content and negatively correlated with litter C/N. Litter N content and C/N rather than litter species richness drove the release of CO2-C and net available N in this ecosystem. The antagonistic effects of litter mixtures contributed to a modest release of CO2-C, but their synergistic effects enhanced net available N. We suggest that in alpine meadow communities, balancing species with high and low N contents will benefit soil carbon sequestration and plant competition for available N with soil microbes.
出处	Plant and Soil
卷	373
期	1-2
页	931-941
收录类别	SCI
语种	英语
ISSN号	0032-079X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30485]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Jiang J.,Li Y. K.,Wang M. Z.,et al. Litter species traits, but not richness, contribute to carbon and nitrogen dynamics in an alpine meadow on the Tibetan Plateau. 2013.

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