气候变化领域集成服务门户(CCPortal): Increased belowground tree carbon allocation in a mature mixed forest in a dry versus a wet year

CCPortal

DOI	10.1111/gcb.17172
	Increased belowground tree carbon allocation in a mature mixed forest in a dry versus a wet year
	Rog, Ido; Hilman, Boaz; Fox, Hagar; Yalin, David; Qubaja, Rafat; Klein, Tamir
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	2
卷号	30 期号:2
英文摘要	Tree species differ in their carbon (C) allocation strategies during environmental change. Disentangling species-specific strategies and contribution to the C balance of mixed forests requires observations at the individual tree level. We measured a complete set of C pools and fluxes at the tree level in five tree species, conifers and broadleaves, co-existing in a mature evergreen mixed Mediterranean forest. Our study period included a drought year followed by an above-average wet year, offering an opportunity to test the effect of water availability on tree C allocation. We found that in comparison to the wet year, C uptake was lower in the dry year, C use was the same, and allocation to belowground sinks was higher. Among the five major C sinks, respiration was the largest (ca. 60%), while root exudation (ca. 10%) and reproduction (ca. 2%) were those that increased the most in the dry year. Most trees relied on stored starch for maintaining a stable soluble sugars balance, but no significant differences were detected in aboveground storage between dry and wet years. The detailed tree-level analysis of nonstructural carbohydrates and delta 13C dynamics suggest interspecific differences in C allocation among fluxes and tissues, specifically in response to the varying water availability. Overall, our findings shed light on mixed forest physiological responses to drought, an increasing phenomenon under the ongoing climate change. How does drought affect mature forest trees' carbon allocation dynamics? Using a monthly mass balance of carbon assimilation and investment above- and belowground, we ask how trees from different species in a mixed Mediterranean forest respond to dry versus wet year. We found that in comparison to the wet year, carbon uptake was lower in the dry year, carbon use was the same, and allocation to belowground sinks was higher. The detailed tree-level analysis suggests interspecific differences of carbon allocation dynamics, specifically in response to the varying water availability.image
英文关键词	belowground; carbon allocation; carbon balance; drought; lipids; mixed forest; nonstructural carbohydrate
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:001160191600001
来源期刊	GLOBAL CHANGE BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303725
作者单位	Weizmann Institute of Science; Max Planck Society; Hebrew University of Jerusalem; Weizmann Institute of Science; Swiss Federal Research Station Agroscope; Arizona State University; Arizona State University-Tempe
推荐引用方式 GB/T 7714	Rog, Ido,Hilman, Boaz,Fox, Hagar,et al. Increased belowground tree carbon allocation in a mature mixed forest in a dry versus a wet year[J],2024,30(2).
APA	Rog, Ido,Hilman, Boaz,Fox, Hagar,Yalin, David,Qubaja, Rafat,&Klein, Tamir.(2024).Increased belowground tree carbon allocation in a mature mixed forest in a dry versus a wet year.GLOBAL CHANGE BIOLOGY,30(2).
MLA	Rog, Ido,et al."Increased belowground tree carbon allocation in a mature mixed forest in a dry versus a wet year".GLOBAL CHANGE BIOLOGY 30.2(2024).