Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow

	Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow
	Ma, Shuang ; Zhu, Xiaoxue ; Zhang, Jing ; Zhang, Lirong ; Che, Rongxiao ; Wang, Fang ; Liu, Hanke ; Niu, Haishan ; Wang, Shiping ; Cui, Xiaoyong
刊名	ECOLOGY AND EVOLUTION
	2015-09-01
英文摘要	Organic nitrogen (N) uptake by plants has been recognized as a significant component of terrestrial N cycle. Several studies indicated that plants have the ability to switch their preference between inorganic and organic forms of N in diverse environments; however, research on plant community response in organic nitrogen uptake to warming and grazing is scarce. Here, we demonstrated that organic N uptake by an alpine plant community decreased under warming with C-13-N-15-enriched glycine addition method. After 6years of treatment, warming decreased plant organic N uptake by 37% as compared to control treatment. Under the condition of grazing, warming reduced plant organic N uptake by 44%. Grazing alone significantly increased organic N absorption by 15%, whereas under warming condition grazing did not affect organic N uptake by the Kobresia humilis community on Tibetan Plateau. Besides, soil NO3-N content explained more than 70% of the variability observed in glycine uptake, and C:N ratio in soil dissolved organic matter remarkably increased under warming treatment. These results suggested warming promoted soil microbial activity and dissolved organic N mineralization. Grazing stimulated organic N uptake by plants, which counteracted the effect of warming.; Organic nitrogen (N) uptake by plants has been recognized as a significant component of terrestrial N cycle. Several studies indicated that plants have the ability to switch their preference between inorganic and organic forms of N in diverse environments; however, research on plant community response in organic nitrogen uptake to warming and grazing is scarce. Here, we demonstrated that organic N uptake by an alpine plant community decreased under warming with C-13-N-15-enriched glycine addition method. After 6years of treatment, warming decreased plant organic N uptake by 37% as compared to control treatment. Under the condition of grazing, warming reduced plant organic N uptake by 44%. Grazing alone significantly increased organic N absorption by 15%, whereas under warming condition grazing did not affect organic N uptake by the Kobresia humilis community on Tibetan Plateau. Besides, soil NO3-N content explained more than 70% of the variability observed in glycine uptake, and C:N ratio in soil dissolved organic matter remarkably increased under warming treatment. These results suggested warming promoted soil microbial activity and dissolved organic N mineralization. Grazing stimulated organic N uptake by plants, which counteracted the effect of warming.
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/5512]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Ma, Shuang,Zhu, Xiaoxue,Zhang, Jing,et al. Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow[J]. ECOLOGY AND EVOLUTION,2015.
APA	Ma, Shuang.,Zhu, Xiaoxue.,Zhang, Jing.,Zhang, Lirong.,Che, Rongxiao.,...&Cui, Xiaoyong.(2015).Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow.ECOLOGY AND EVOLUTION.
MLA	Ma, Shuang,et al."Warming decreased and grazing increased plant uptake of amino acids in an alpine meadow".ECOLOGY AND EVOLUTION (2015).