Environmental and physiological controls on sap flow in a subhumid mountainous catchment in North China

doi:10.1016/j.agrformet.2017.03.018

IEECAS OpenIR > 黄土与第四纪地质国家重点实验室（2010~）

	Environmental and physiological controls on sap flow in a subhumid mountainous catchment in North China
	Tie, Qiang 1; Hu, Hongchang 1; Tian, Fuqiang 1; Guan, Huade 2; Lin, Henry 3,4
	2017-06-15
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY
卷号	240 期号:2017 页码:46-57
文章类型	Article
摘要	To accurately quantify tree transpiration and determine related hydrologic and physiological processes, it is important to have reliable information on environmental and physiological controls on sap flow. The objective of this study is to explore the environmental and physiological controls on sap flow in a headwater catchment in the subhumid mountainous region of North China, which has pronounced environmental specificities in hydro-climatic conditions, bedrock properties, and edaphic features. Sap flow in Aspen (Populus davidiana) (one of the dominant tree species in the region) and relevant environmental and physiological factors were measured from 2013 to 2014. The results indicate the following: (1) The dominant controlling factor of sap flow switched from a meteorological to a physiological factor when leaf area index (LAI) dropped to a low value (approximately <1 m(2) m(-2)) around early October; (2) LAI exhibited a threshold control on possible maximum sap flow with a LAI threshold value of 3.5 m(2) m(-2), while environmental factors led to fluctuations in sap flow within the upper bound that was determined by the physiological factor LAI; (3) Photosynthetically active radiation (PAR) was the key environmental factor controlling sap flow as a whole, while at the monthly timescale the controls of environmental factors on sap flow had significant seasonal variability; (4) The diurnal relationships between sap flow and environmental factors revealed evident hysteresis loops, which were markedly influenced by the radiation factor. With the combination of the environmental factor PAR and the physiological factor LAI, an empirical regression equation (SFD = 0.7059PAR * LAI + 4.5068, R-2 = 0.8862, n = 207) was established for sap flow estimation in the study area. These results shed light on the hydrologic and physiological processes involved in tree transpiration, and contribute to the refinement of tree transpiration models in regions under similar environmental conditions. (C) 2017 Elsevier B.V. All rights reserved.
关键词	Sap Flow Subhumid Mountainous Region Aspen (Populus Davidiana) Photosynthetically Active Radiation Leaf Area Index Threshold Control
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI	10.1016/j.agrformet.2017.03.018
关键词[WOS]	TREE WATER-USE ; SOIL-MOISTURE ; CANOPY CONDUCTANCE ; ARID REGION ; STOMATAL CONDUCTANCE ; SOLAR-RADIATION ; LEAF-AREA ; TRANSPIRATION ; FOREST ; RESPONSES
收录类别	SCI
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000405881400006
引用统计	被引频次：75[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/5432
专题	黄土与第四纪地质国家重点实验室（2010~）
作者单位	1.Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China 2.Flinders Univ S Australia, Sch Environm, Adelaide, SA, Australia 3.Chinese Acad Sci, Inst Earth Environm, Xian 710061, Peoples R China 4.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Tie, Qiang,Hu, Hongchang,Tian, Fuqiang,et al. Environmental and physiological controls on sap flow in a subhumid mountainous catchment in North China[J]. AGRICULTURAL AND FOREST METEOROLOGY,2017,240(2017):46-57.
APA	Tie, Qiang,Hu, Hongchang,Tian, Fuqiang,Guan, Huade,&Lin, Henry.(2017).Environmental and physiological controls on sap flow in a subhumid mountainous catchment in North China.AGRICULTURAL AND FOREST METEOROLOGY,240(2017),46-57.
MLA	Tie, Qiang,et al."Environmental and physiological controls on sap flow in a subhumid mountainous catchment in North China".AGRICULTURAL AND FOREST METEOROLOGY 240.2017(2017):46-57.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Environmental and ph（3804KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	请求全文