气候变化领域集成服务门户(CCPortal): Multi-year nitrogen accumulation weakens the stabilizing effect of species asynchrony on drought resistance in a Tibetan alpine meadow

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DOI	10.1016/j.agrformet.2023.109617
	Multi-year nitrogen accumulation weakens the stabilizing effect of species asynchrony on drought resistance in a Tibetan alpine meadow
	Hou, Ge; Zhou, Tiancai; Shi, Peili; Sun, Jian; Zong, Ning; Yu, Jialuo; Song, Minghua
发表日期	2023
ISSN	0168-1923
EISSN	1873-2240
卷号	340
英文摘要	Although the impacts of exogenic nitrogen (N) enrichment and drought on grassland community productivity are well known, their interactive effects on community stability remain insufficiently understood. In this study, a seven-year N enrichment experiment was conducted in a Tibetan alpine meadow to examine the effects of Naltered species richness, species dominance, species asynchrony, and pre-drought biomass on community stability, resistance, and resilience during two natural drought stresses (the first severe drought stress in 2015, FDS, and the second light drought stress in 2019, SDS). Our results indicate that N enrichment did not alter species richness but significantly reduced species asynchrony and dominance. Community stability showed a significant correlation with species asynchrony and dominance while remaining independent of species richness. Drought resistance, which was positively associated with community stability, was primarily influenced by species asynchrony and pre-drought biomass, rather than species dominance. Remarkably, the slopes of resistance in relation to the aforementioned factors were steeper in SDS than in FDS, despite SDS being lighter than FDS, indicating a more sensitive response to drought resistance to long-term N accumulation. In contrast, resilience was unaffected by species richness but increased with the rate of N addition. During the FDS, drought resistance and community stability were primarily governed by species asynchrony, while during the SDS, pre-drought biomass overwhelmingly determined drought resistance, surpassing the role of species asynchrony. These findings demonstrate the opposite effects of multi-year N accumulation on species asynchrony and pre-drought biomass, both of which reduce drought resistance and community stability over time. Therefore, our results contribute to a deeper understanding of grassland community stability in the face of N enrichment and natural drought stresses, aiding in predictions of grassland responses to ongoing global environmental changes.
关键词	Nitrogen enrichment Natural drought stresses Species asynchrony Pre-drought biomass Resistance Stability
英文关键词	ECOSYSTEM STABILITY; TEMPORAL STABILITY; PLANT DIVERSITY; BIODIVERSITY; GRASSLAND; PRODUCTIVITY; PRECIPITATION; CLIMATE; RESILIENCE; ENRICHMENT
WOS研究方向	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001052282300001
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
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/283728
作者单位	Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS
推荐引用方式 GB/T 7714	Hou, Ge,Zhou, Tiancai,Shi, Peili,et al. Multi-year nitrogen accumulation weakens the stabilizing effect of species asynchrony on drought resistance in a Tibetan alpine meadow[J]. 中国科学院青藏高原研究所,2023,340.
APA	Hou, Ge.,Zhou, Tiancai.,Shi, Peili.,Sun, Jian.,Zong, Ning.,...&Song, Minghua.(2023).Multi-year nitrogen accumulation weakens the stabilizing effect of species asynchrony on drought resistance in a Tibetan alpine meadow.AGRICULTURAL AND FOREST METEOROLOGY,340.
MLA	Hou, Ge,et al."Multi-year nitrogen accumulation weakens the stabilizing effect of species asynchrony on drought resistance in a Tibetan alpine meadow".AGRICULTURAL AND FOREST METEOROLOGY 340(2023).