干旱区生态环境知识资源中心(Arid): Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low-energy headwater catchment

Arid

DOI	10.1002/eco.2125
	Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low-energy headwater catchment
	Wang, Hailong 1,4; Tetzlaff, Doerthe 1,2,3; Soulsby, Chris 1,2
通讯作者	Wang, Hailong
来源期刊	ECOHYDROLOGY
ISSN	1936-0584
EISSN	1936-0592
出版年	2019
卷号	12 期号:6
英文摘要	Transpiration mediated by physiology is driven by the meteorological variables. Understanding their relationships is crucial to advancing terrestrial ecohydrological studies. Here, we used sap flow measurements in Scots pine to examine the temporal responses of transpiration to temperature (Ta), vapour pressure deficit (VPD), and net radiation (Rn). Seasonal variations and the hysteresis between sap flux density (Js) and meteorological variables were investigated. The results show that VPD and Rn were dominant factors influencing hourly Js. Daily peaks of Js lagged behind peaks of Ta, VPD, and Rn, by ~2-4 hr. Anticlockwise hysteresis loops between Js and Ta and VPD were observed, and the size of loops change with prevailing weather conditions (i.e., rainy or rainless) and seasons. Longer time lags were found in April and September than in other months. The hysteresis is partly related to the low energy, humid nature of the site which resulted in limited moisture stress to the trees, and thus the trees did not necessarily need a conservation mechanism to restrict water loss as proposed by other studies in semi-arid areas. Release and refill of trunk water storage could plausibly contribute to the hysteresis, although the effect may be entwined with atmospheric demand making it difficult to separate without sophisticated measurements. This study highlights the diversity in plant water relations across temporal scales and seasons and calls for more work across geographic locations and climates.
英文关键词	environmental changes hysteresis sap flow Scots pine transpiration trunk water storage
类型	Article
语种	英语
国家	Scotland ; Germany ; Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000489267200012
WOS关键词	WATER-USE ; CANOPY CONDUCTANCE ; ENVIRONMENTAL CONTROLS ; STOMATAL CONDUCTANCE ; STORED WATER ; STORAGE DYNAMICS ; TRANSPIRATION ; TREE ; FOREST ; MODEL
WOS类目	Ecology ; Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215143
作者单位	1.Univ Aberdeen, Sch Geosci, Northern Rivers Inst, Aberdeen, Scotland; 2.Leibniz Inst Freshwater Ecol & Inland Fisheries, IGB, Dept Ecohydrol, Berlin, Germany; 3.Humboldt Univ, Dept Geog, Berlin, Germany; 4.Sun Yat Sen Univ, Sch Civil Engn, Guangzhou 510275, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Wang, Hailong,Tetzlaff, Doerthe,Soulsby, Chris. Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low-energy headwater catchment[J],2019,12(6).
APA	Wang, Hailong,Tetzlaff, Doerthe,&Soulsby, Chris.(2019).Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low-energy headwater catchment.ECOHYDROLOGY,12(6).
MLA	Wang, Hailong,et al."Hysteretic response of sap flow in Scots pine (Pinus sylvestris) to meteorological forcing in a humid low-energy headwater catchment".ECOHYDROLOGY 12.6(2019).