气候变化领域集成服务门户(CCPortal): Temperature rather than N availability determines root exudation of alpine coniferous forests on the eastern Tibetan Plateau along elevation gradients

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DOI	10.1093/treephys/tpad067
	Temperature rather than N availability determines root exudation of alpine coniferous forests on the eastern Tibetan Plateau along elevation gradients
	Yang, Han; Zhang, Peipei; Wang, Qitong; Deng, Shaojun; He, Xi; Zhang, Xinjun; Wang, Ruihong; Feng, Qiuhong; Yin, Huajun
发表日期	2023
ISSN	0829-318X
EISSN	1758-4469
起始页码	1479
结束页码	1492
卷号	43 期号:9
英文摘要	Root exudation fulfills fundamental roles in regulating carbon (C)-nutrient cycling in forest ecosystems, yet the main ecological drivers of root exudation and underlying mechanisms in forests under natural gradients remain poorly understood. Here, we investigated the intraspecific variation of root exudation rates in two alpine coniferous forests (Abies faxoniana Rehder et Wilson and Abies georgei Orr) along two elevation gradients on the eastern Tibetan Plateau. Meanwhile, the fine root traits and associated climate and soil parameters were assessed to examine the effects of elevation-dependent changes in climatic and soil nutrient conditions on root exudation. Results showed that root exudation rates decreased with increasing elevation and were positively correlated with mean air temperature. However, the relationships of root exudation with soil moisture and soil nitrogen availability were not significant. The structural equation model (SEM) further revealed that air temperature affected root exudation both directly and indirectly through the effects on fine root morphology and biomass, implying that the adaption of root C allocation and fine root morphological traits to low temperatures primarily resulted in declined root exudation at higher elevations. These results highlight the perceived importance of temperature in determining the elevational variation of root exudation in alpine coniferous forests, which has foreseeably great implications for the exudate-mediated ecosystem C and nutrient processes in the face of drastic warming on the eastern Tibetan Plateau.
关键词	climatic variables fine root traits nutrient availability
英文关键词	ORGANIC-CARBON; PINE FOREST; SOIL; NITROGEN; RHIZOSPHERE; ALTITUDE; RESPIRATION; TRAITS; SIGNATURES; COMMUNITY
WOS研究方向	Forestry
WOS记录号	WOS:001008829200001
来源期刊	TREE PHYSIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283850
作者单位	Chinese Academy of Sciences; Chengdu Institute of Biology, CAS; Chinese Academy of Sciences; Chengdu Institute of Biology, CAS; Chinese Academy of Sciences; Chengdu Institute of Biology, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Tibet Agriculture & Animal Husbandry University; Tibet Agriculture & Animal Husbandry University
推荐引用方式 GB/T 7714	Yang, Han,Zhang, Peipei,Wang, Qitong,et al. Temperature rather than N availability determines root exudation of alpine coniferous forests on the eastern Tibetan Plateau along elevation gradients[J],2023,43(9).
APA	Yang, Han.,Zhang, Peipei.,Wang, Qitong.,Deng, Shaojun.,He, Xi.,...&Yin, Huajun.(2023).Temperature rather than N availability determines root exudation of alpine coniferous forests on the eastern Tibetan Plateau along elevation gradients.TREE PHYSIOLOGY,43(9).
MLA	Yang, Han,et al."Temperature rather than N availability determines root exudation of alpine coniferous forests on the eastern Tibetan Plateau along elevation gradients".TREE PHYSIOLOGY 43.9(2023).