气候变化领域集成服务门户(CCPortal): Plant nitrogen concentration is more sensitive in response to degradation than phosphorus concentration in alpine meadow

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DOI	10.1016/j.ecoleng.2021.106323
	Plant nitrogen concentration is more sensitive in response to degradation than phosphorus concentration in alpine meadow
	Zhou, Tiancai; Zong, Ning; Sun, Jian; Hou, Ge; Shi, Peili
通讯作者	Shi, PL (通讯作者)
发表日期	2021
ISSN	0925-8574
EISSN	1872-6992
卷号	169
英文摘要	Exploring the early warning signals of plant and soil characteristics in response to degradation is of great theoretical significance to illuminate the underlying driving mechanism of alpine meadow degradation. Here, in alpine meadow of Damxung County on the Tibetan Plateau, a field survey along degradation gradients was conducted to measure plant and soil properties: from non-degradation to severely degradation, simultaneous impairments in plant total biomass, plant coverage, plant N concentration, soil moisture, soil total C and N were detected, which significantly (P<0.05) decreased by 85.36%, 54.30%, 25.23%, 26.95%, 28.94% and 12.85% in sequence, while no significant change in plant P concentration was observed. As grassland degradation increased, a consistent decrease of plant N: P ratios (<14) not only demonstrated that N was a strong limiting factor for plants growth, but also supported our hypothesis that plant N concentration was more sensitive in response to degradation than plant P concentration. Path analyses further indicated that soil moisture and soil total nitrogen were the most critical factors that mediated the plant N: P in response to degradation. Although our findings suggested that N resorption efficiency was improved after grassland degradation, the increase in grassland degradation would enhance the N concentration decoupling from P concentration, which in turn might further exacerbate the N limitation and the degradation in alpine ecosystems. The early-warning signals of grassland degradation obtained here not only can improve the understanding of grassland degradation, but also can provide guidance for the restoration and management of degraded alpine meadow on the Tibetan Plateau.
关键词	N-P RATIOS GRASSLAND DEGRADATION TERRESTRIAL PLANTS INORGANIC NITROGEN DEGRADED GRADIENTS SOIL NUTRIENTS STOICHIOMETRY RESORPTION VEGETATION COMMUNITY
英文关键词	Alpine meadow; Grassland degradation; Plant nutrients concentrations; Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Engineering
WOS类目	Ecology ; Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:000674452700008
来源期刊	ECOLOGICAL ENGINEERING
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260169
推荐引用方式 GB/T 7714	Zhou, Tiancai,Zong, Ning,Sun, Jian,et al. Plant nitrogen concentration is more sensitive in response to degradation than phosphorus concentration in alpine meadow[J]. 中国科学院青藏高原研究所,2021,169.
APA	Zhou, Tiancai,Zong, Ning,Sun, Jian,Hou, Ge,&Shi, Peili.(2021).Plant nitrogen concentration is more sensitive in response to degradation than phosphorus concentration in alpine meadow.ECOLOGICAL ENGINEERING,169.
MLA	Zhou, Tiancai,et al."Plant nitrogen concentration is more sensitive in response to degradation than phosphorus concentration in alpine meadow".ECOLOGICAL ENGINEERING 169(2021).