文献类型：期刊文献

英文题名：Active summer carbon storage for winter persistence in trees at the cold alpine treeline

作者：Li, Mai-He[1,2,3] Jiang, Yong[3] Wang, Ao[1,2] Li, Xiaobin[4,5] Zhu, Wanze[6] Yan, Cai-Feng[7] Du, Zhong[8] Shi, Zheng[9] Lei, Jingpin[10,11] Schonbeck, Leonie[2] He, Peng[2,3] Yu, Fei-Hai[1] Wang, Xue[1,2,3]

第一作者：Li, Mai-He

通信作者：Wang, X[1];Wang, X[2];Wang, X[3]

机构：[1]Taizhou Univ, Zhejiang Prov Key Lab Plant Evolutionary Ecol &, Taizhou 318000, Peoples R China;[2]Swiss Fed Res Inst WSL, Forest Dynam, Zuercherstr 111, CH-8903 Birmensdorf, Switzerland;[3]Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Liaoning, Peoples R China;[4]Shanghai Jiao Tong Univ, State Key Lab Microbial Metab, Shanghai 200030, Peoples R China;[5]Shanghai Jiao Tong Univ, Sch Life Sci & Biotechnol, Shanghai 200030, Peoples R China;[6]Chinese Acad Sci, Inst Mt Hazard & Environm, Chengdu 610041, Sichuan, Peoples R China;[7]Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China;[8]China West Normal Univ, Coll Land & Resources, Nanchong, Sichuan 637002, Peoples R China;[9]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China;[10]Chinese Acad Forestry, Res Inst Forestry, Beijing 10091, Peoples R China;[11]Nanjing Forestry Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Jiangsu, Peoples R China

年份：2018

卷号：38

期号：9

起止页码：1345-1355

外文期刊名：TREE PHYSIOLOGY

收录：;Scopus(收录号：2-s2.0-85051102580);WOS:【SCI-EXPANDED(收录号:WOS:000452456200008)】；

基金：We sincerely thank Dr Peter Millard and three anonymous referees for their insightful comments on our paper. This work was supported by the National Natural Science Foundation of China (41371076, 31570501), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB15010302) and the Fundamental Research Funds for the Central Nonprofit Research Institution of CAF (CAFYBB2014ZD001), and is also partly supported by Sino-Swiss Science and Technology Cooperation (SSSTC) program (EG 06-032015).

语种：英文

外文关键词：alpine treeline; altitudinal gradient; carbon balance; nitrogen; non-structural carbohydrates; starch; sugars

摘要：The low-temperature limited alpine treeline is one of the most obvious boundaries in mountain landscapes. The question of whether resource limitation is the physiological mechanism for the formation of the alpine treeline is still waiting for conclusive evidence and answers. We therefore examined non-structural carbohydrates (NSC) and nitrogen (N) in treeline trees (TATs) and low-elevation trees (LETs) in both summer and winter in 11 alpine treeline cases ranging from subtropical monsoon to temperate continental climates across Eurasia. We found that tissue N concentration did not decrease with increasing elevation at the individual treeline level, but the mean root N concentration was lower in TATs than in LETs across treelines in summer. The TATs did not have lower tissue NSC concentrations than LETs in summer. However, the present study with multiple tree species across a large geographical scale, for the first time, revealed a common phenomenon that TATs had significantly lower NSC concentration in roots but not in the aboveground tissues than LETs in winter. Compared with LETs, TATs exhibited both a passive NSC storage in aboveground tissues in excess of carbon demand and an active starch storage in roots at the expense of growth reduction during the growing season. This starch accumulation disappeared in winter. Our results highlight some important aspects of the N and carbon physiology in relation to season in trees at their upper limits. Whether or to what extent the disadvantages of winter root NSC and summer root N level of TATs affect the growth of treeline trees and the alpine treeline formation needs to be further studied.