DOI: 10.1029/2018JD028384
Scopus记录号: 2-s2.0-85051024016
论文题名: Modeling the Response of Daily Evapotranspiration and its Components of a Larch Plantation to the Variation of Weather, Soil Moisture, and Canopy Leaf Area Index
作者: Liu Z. ; Wang Y. ; Tian A. ; Webb A.A. ; Yu P. ; Xiong W. ; Xu L. ; Wang Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 14 起始页码: 7354
结束页码: 7374
语种: 英语
英文关键词: daily evapotranspiration and its components
; larch plantation
; leaf area index
; model coupling
; potential evapotranspiration
; soil moisture
Scopus关键词: Larix
英文摘要: An accurate prediction of forest evapotranspiration (ET) based on its components in response to a changing environment is essential for understanding interactions between the atmosphere, soil, and vegetation and for integrated forest-water management. The ET components of a pure larch plantation and the environment were monitored over 2 years in northwest China. The response functions of each ET component to individual driving factors were determined using upper boundary lines, then coupled to form the ET component modules, fitted with measured data in 2016 (May–September), and validated with measured data in 2015 (June–September). Results showed that (1) the response of daily transpiration (T) to potential ET (ETref) followed a binomial equation, and the response of T to relative extractable water (REW) of the 0- to 60-cm soil layer and canopy leaf area index (LAI) followed a saturated exponential growth function. The module was T = (−5.766 × 10−4ETref 2 + 0.005ETref–0.002) × (18.769 + 46.990 (1–exp(−8.555REW))) × (−14.662 + 17.428 (1–exp(−1.414LAI))). (2) The response of daily forest floor evapotranspiration (FE) to ETref, volumetric soil moisture (VSM) of the 0- to 30-cm soil layer, and LAI followed positive linear, saturated exponential growth and saturated exponential decay function. The module was FE = (6.697ETref–2.770) × (6.927–11.243exp(−1.959VSM)) × (0.032 + 1.162exp(−2.407LAI)). (3) The canopy interception (Ic) of individual rainfall events was mainly affected by precipitation amount (P) and LAI. The module was Ic = 0.446 LAI (1–exp(−0.112P)) + 0.097P. (4) The daily ET model was built up as ET = T + FE + Ic, which had good performance in both the calibration and validation period. It can be concluded that the variation of daily forest ET can be accurately predicted using the easily measurable driving factors of weather, soil, and vegetation. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113514
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Forestry Ecology and Environment of the State Forestry Administration of China, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, China; NSW Department of Primary Industries, Tamworth Agricultural Institute, Calala, NSW, Australia; Now at WaterNSW, Tamworth, NSW, Australia
Recommended Citation:
Liu Z.,Wang Y.,Tian A.,et al. Modeling the Response of Daily Evapotranspiration and its Components of a Larch Plantation to the Variation of Weather, Soil Moisture, and Canopy Leaf Area Index[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(14)