Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China
Zhu, XJ; Yu, GR; Hu, ZM; Wang, QF; He, HL; Yan, JH; Wang, HM; Zhang, JH
2015
Source PublicationECOLOGICAL INDICATORS
ISSN1470-160X
Volume52Pages:411-421
AbstractEvapotranspiration (ET), which is comprised by evaporation from soil surface (E), transpiration (T) and evaporation from the intercepted water by canopy (EI), plays an important role in maintaining global energy balance and regulating climate. Quantifying the spatiotemporal variations of T/ET (the ratio of T to ET) can improve our understandings on the role of vegetation ecophysiological processes in climate regulation. Using eddy covariance measurements at three forest ecosystems (Changbaishan temperate broad-leaved Korean pine mixed forest (CBS), Qianyanzhou subtropical coniferous plantation (QYZ) and Dinghushan subtropical evergreen mixed forest (DHS)) in north-south transect of Eastern China (NSTEC), we run the revised Shuttleworth-Wallace model (S-W model), validated its performance with the water vapor fluxes measured at two layers, and quantified the spatiotemporal variations of T/ET. The S-W model performed well in simulating ET and T/ET. The mean value of annual T/ET at three forests during the observation period all exceeded 0.6. The diurnal variation of canopy stomal conductance (G(c)) dominated that of TAT. The seasonal dynamics of T/ El was mainly shaped by that of leaf area index (LAI), vapor pressure deficit (VPD) and air temperature (T-a) through altering G, and the portion that the energy absorbed by canopy (P-EC) at temperate forest (CBS), while the seasonal dynamics of T/ET at subtropical forests (QYZ and DHS) were mainly affected by T-a, net radiation, VPD, and soil water content through altering G(c) and soil surface conductance (G(s)). The variation of mean annual G(c) governed the interannual varaition and spatial variation of T/ET. Therefore, forests in Eastern China played an important role in regulating climate through T and G(c) primarily affected the spatial and temproal variations of the role of forest Tin regulating climate. (C) 2015 Elsevier Ltd. All rights reserved.
SubtypeJournal
KeywordEddy covariance Shuttleworth-Wallace model Evapotranspiration The ratio of transpiration to evapotranspiration (T/ET) Forest
Subject AreaBiodiversity & Conservation ; Environmental Sciences & Ecology
WOS Subject ExtendedBiodiversity Conservation ; Environmental Sciences
WOS KeywordWATER-USE EFFICIENCY ; CARBON-DIOXIDE EXCHANGE ; GAP FILLING STRATEGIES ; NET ECOSYSTEM EXCHANGE ; LEAF-AREA INDEX ; GRASSLAND ECOSYSTEMS ; CANOPY CONDUCTANCE ; TERRESTRIAL ECOSYSTEMS ; CLOUD FOREST ; MIXED FOREST
Indexed BySCI
Language英语
WOS IDWOS:000350918600043
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44426
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Zhu, XJ,Yu, GR,Hu, ZM,et al. Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China[J]. ECOLOGICAL INDICATORS,2015,52:411-421.
APA Zhu, XJ.,Yu, GR.,Hu, ZM.,Wang, QF.,He, HL.,...&Zhang, JH.(2015).Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China.ECOLOGICAL INDICATORS,52,411-421.
MLA Zhu, XJ,et al."Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China".ECOLOGICAL INDICATORS 52(2015):411-421.
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