Stem CO2 efflux of Abies fabri in subalpine forests in the Gongga Mountains, Eastern Tibetan Plateau

doi:10.1093/jpe/rtw100

	Stem CO2 efflux of Abies fabri in subalpine forests in the Gongga Mountains, Eastern Tibetan Plateau
	Zhao, Guang 1,2; Liu, Gangcai 1; Zhu, Wanze 1; Zhao, Jixia 1,2; Wang, Xuemei 1,2; Wang, Yaoyao 1,2; Jia, Min 1,2
刊名	JOURNAL OF PLANT ECOLOGY
	2017-12-01
卷号	10 期号:6 页码:1001-1011
关键词	stem CO2 efflux Q(10) DBH sapwood nitrogen contents subalpine forests
ISSN号	1752-9921
DOI	10.1093/jpe/rtw100
通讯作者	Zhu, Wanze(wzzhu@imde.ac.cn)
英文摘要	Aims Despite the importance of stem CO2 efflux (E-s) in ecosystem carbon cycling and energy balance, little is known about temporal variation in the temperature coefficient (Q(10)) and sapwood nitrogen concentrations ([N]) and their intrinsic links with E-s. The objectives of this study were: (i) to examine the response of E-s to temperature in a subalpine region and (ii) to explore the influence of stem diameter and [N] on E-s. Also, we will test the hypothesis that (i) E-s in trees has thermal acclimation and (ii) E-s will be well correlated with diameter at breast height (DBH) and [N]. Methods Here, a horizontally oriented soil chamber technique was applied to measure E-s of Abies fabri in two subalpine forest stands in Southwestern China from May to December 2014. We also examined the variability in E-s, Q(10) and [N] in trees and monitored the relationship between temperature, [N], DBH and E-s. Important Findings During the measurement period, E-s showed an apparent seasonal trend, following the change in air temperature, increasing from May and peaking in July, then continuously decreasing until December. The mean E-s for the growing and dormant seasons were 1.45 and 0.25 mu mol.m(-2).s(-1), respectively, and E-s in the mature forest was significantly higher than in the immature forest. The area-based E-s was positively correlated with DBH and sapwood width (SW), while volume-based E-s showed negative relationship with DBH and SW. Across the five diameter classes, 69.8-89.0% of the variation in E-s could be explained by air temperature. The temperature sensitivity (Q(10)) of E-s ranged from 2.98 to 5.61 during the measurement period, with a higher Q(10) appearing in the growing season than in the dormant season. There was a significant linear relationship (P < 0.01) between [N] and E-s (expressed based on two different units). Additionally, exponential models of E-s against [N] and air temperature were applied to estimate E-s.
资助项目	National Nature Science Foundation of China[41471232] ; Knowledge Innovation Priority Project of the Chinese Academy of Sciences[KZCX2-EW-309]
WOS关键词	NORWAY SPRUCE TREES ; MAINTENANCE RESPIRATION RATES ; JAPANESE RED PINE ; WOODY-TISSUE ; PLANT RESPIRATION ; RAIN-FOREST ; CONTRASTING CLIMATES ; SEASONAL-VARIATIONS ; ROOT RESPIRATION ; CARBON-DIOXIDE
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000417978400012
资助机构	National Nature Science Foundation of China ; Knowledge Innovation Priority Project of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/60685]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhu, Wanze
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Mt Hazards & Environm, 9,Block 4,Renminnanlu Rd, Chengdu 610041, Sichuan, Peoples R China 2.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Guang,Liu, Gangcai,Zhu, Wanze,et al. Stem CO2 efflux of Abies fabri in subalpine forests in the Gongga Mountains, Eastern Tibetan Plateau[J]. JOURNAL OF PLANT ECOLOGY,2017,10(6):1001-1011.
APA	Zhao, Guang.,Liu, Gangcai.,Zhu, Wanze.,Zhao, Jixia.,Wang, Xuemei.,...&Jia, Min.(2017).Stem CO2 efflux of Abies fabri in subalpine forests in the Gongga Mountains, Eastern Tibetan Plateau.JOURNAL OF PLANT ECOLOGY,10(6),1001-1011.
MLA	Zhao, Guang,et al."Stem CO2 efflux of Abies fabri in subalpine forests in the Gongga Mountains, Eastern Tibetan Plateau".JOURNAL OF PLANT ECOLOGY 10.6(2017):1001-1011.