Above- and belowground trait linkages of dominant species shape responses of alpine steppe composition to precipitation changes in the Tibetan Plateau

NWIPB OpenIR

	Above- and belowground trait linkages of dominant species shape responses of alpine steppe composition to precipitation changes in the Tibetan Plateau
	Zheng, Zhi; Zhang, Yue; Zhang, Shihu; Ma, Qun; Gong, Dajie; Zhou, Guoying
	2021
发表期刊	JOURNAL OF PLANT ECOLOGY
卷号	14 期号:4
摘要	Aims Human activities and global changes have led to alterations in global and regional precipitation regimes. Despite extensive studies on the effects of changes in precipitation regimes on plant community composition across different types of grassland worldwide, few studies have specifically focused on the effects of precipitation changes on high-altitude alpine steppe at community and plant species levels in the Tibetan Plateau. Methods We investigated the effects of growing-season precipitation changes (reduced precipitation by 50%, ambient precipitation, enhanced precipitation by 50%) for 6 years on plant community composition in an alpine steppe of the Tibetan Plateau by linking above- to belowground traits of dominant species. Important Findings We found that reduced precipitation shifted community composition from dominance by bunchgrass (primarily Stipa purpurea) to dominance by rhizomatous grass (primarily Leymus secalinus). Roots and leaf traits of L. secalinus and S. purpurea differed in their responses to reduced precipitation. Reduced precipitation enhanced root vertical length and carbon (C) allocation to deep soil layers, and decreased the leaf width in L. secalinus, but it did not change the traits in S. purpurea. Moreover, reduced precipitation significantly enhanced rhizome biomass, length, diameter and adventitious root at the rhizome nodes in L. secalinus. These changes in traits may render rhizomatous grass greater competitive during drought stress. Therefore, our findings highlight important roles of above- and belowground traits of dominant species in plant community composition of alpine steppe under precipitation change.
关键词	precipitation change functional group dominant species Stipa purpurea Leymus secalinus soil moisture plant traits alpine steppe the Tibetan Plateau
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/60762
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Zheng, Zhi,Zhang, Yue,Zhang, Shihu,et al. Above- and belowground trait linkages of dominant species shape responses of alpine steppe composition to precipitation changes in the Tibetan Plateau[J]. JOURNAL OF PLANT ECOLOGY,2021,14(4).
APA	Zheng, Zhi,Zhang, Yue,Zhang, Shihu,Ma, Qun,Gong, Dajie,&Zhou, Guoying.(2021).Above- and belowground trait linkages of dominant species shape responses of alpine steppe composition to precipitation changes in the Tibetan Plateau.JOURNAL OF PLANT ECOLOGY,14(4).
MLA	Zheng, Zhi,et al."Above- and belowground trait linkages of dominant species shape responses of alpine steppe composition to precipitation changes in the Tibetan Plateau".JOURNAL OF PLANT ECOLOGY 14.4(2021).