Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China

doi:10.3390/f9010002

	Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China
	Tian, Quanyan 1,4; He, Zhibin 1; Xiao, Shengchun 2; Du, Jun 1; Peng, Xiaomei 3; Chen, Longfei 1; Lin, Pengfei 1,4; Zhu, Xi 1,4; Ding, Aijun 1,4
刊名	FORESTS
	2018
卷号	9 期号:1 页码:14
关键词	Qinghai spruce stem radial changes sap flow environmental factors water-use efficiency
ISSN号	1999-4907
DOI	10.3390/f9010002
通讯作者	He, Zhibin(hzbmail@lzb.ac.cn)
英文摘要	Global climate change is likely to change precipitation patterns with consequences for tree water use and growth in semi-arid areas. However, little is known about the effects of variability in precipitation on growth- and water-related physiological processes of native trees in dry areas of northwestern China. In this study, sap flow and stem radial variability in four Qinghai spruce trees (Picea crassifolia) were monitored in the Qilian Mountains, China. Tree water deficit (W) and basal area increment (BAI) were calculated using stem radial variation; water-use efficiency (WUE) was then estimated as the ratio of BAI and sap flow (Jt). The results showed that sap flow density (Js) increased logarithmically with increasing W when W < 50 m, and then gradually stabilized. Multiple factor generalized additive models (GAM) showed that Js was closely related to all measured environmental variables except for daily mean temperature and relative air humidity. W was related to the minimum daily temperature and soil water content. WUE exhibited higher values in early July. Low WUE was observed under conditions of prolonged dry weather, but it quickly increased during rainy days. WUE decreased after precipitation events due to high transpiration. We concluded that, in these semi-arid areas, precipitation is the most important controlling factor in tree growth and transpiration.
资助项目	National Natural Science Foundation of China[41522102] ; National Natural Science Foundation of China[41601051] ; National Key Research and Development Program of China[2016YFC0501001] ; Funds for Creative Research Groups of China[41621001]
WOS关键词	CENTRAL TYROLEAN ALPS ; HEIHE RIVER-BASIN ; ARID NORTHWESTERN CHINA ; DESERT RIPARIAN FOREST ; PICEA-CRASSIFOLIA ; ENVIRONMENTAL-FACTORS ; POPULUS-EUPHRATICA ; PINUS-CEMBRA ; CANOPY CONDUCTANCE ; TEMPORAL DYNAMICS
WOS研究方向	Forestry
语种	英语
出版者	MDPI AG
WOS记录号	WOS:000424115000002
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China ; Funds for Creative Research Groups of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/57118]
专题	中国科学院地理科学与资源研究所
通讯作者	He, Zhibin
作者单位	1.Chinese Acad Sci, Linze Inland River Basin Res Stn, Chinese Ecosyst Res Network, Key Lab Ecohydrol Inland River Basin,Northwest In, Lanzhou 730000, Gansu, Peoples R China 2.Chinese Acad Sci, Key Lab Ecohydrol Inland River Basin, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China 3.Chinese Acad Sci, Key Lab Desert & Desertificat, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Tian, Quanyan,He, Zhibin,Xiao, Shengchun,et al. Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China[J]. FORESTS,2018,9(1):14.
APA	Tian, Quanyan.,He, Zhibin.,Xiao, Shengchun.,Du, Jun.,Peng, Xiaomei.,...&Ding, Aijun.(2018).Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China.FORESTS,9(1),14.
MLA	Tian, Quanyan,et al."Growing Season Stem Water Status Assessment of Qinghai Spruce through the Sap Flow and Stem Radial Variations in the Qilian Mountains of China".FORESTS 9.1(2018):14.