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DOI10.1016/j.agrformet.2024.109960
Energy availability and leaf area dominate control of ecosystem evapotranspiration in the southeastern US
发表日期2024
ISSN0168-1923
EISSN1873-2240
起始页码349
卷号349
英文摘要Evapotranspiration (ET) links water, energy, and carbon balances, and its magnitude and patterns are changing due to climate and land use change in the southeastern U.S. Quantifying the environmental controls on ET is essential for developing reliable ecohydrological models for water resources management. Here, we synthesized eddy covariance data from 24 AmeriFlux sites distributed across the southeastern U.S., comprising 162 site -years of flux data representing six representative ecosystems including cropland vegetation mosaic (CVM), deciduous broadleaf forests (DBF), evergreen needle -leaf forests (ENF), grasslands (GRA), savannas (SAV), and wetlands (WET). Our objectives were to assess the daily, seasonal, and annual variability in ET and to develop practical predictive models for regional applications in ecosystem service analysis. We evaluated the response of ET to climatic and biotic forcings including potential evapotranspiration (PET), precipitation (P), and leaf area index (LAI), and compared the performance of these empirical ET models based and those developed using machine learning algorithms. Our results showed that the mean daily ET varied significantly, ranging from 1.36 mm d(-1) in GRA to 2.30 mm d(-1) in SAV, with a numerical order : GRA < DBF < ENF < WET < CVM < SAV. In this humid region, mean annual PET exceeded P in 16 out of the 24 flux sites. Using the Budyko framework, we showed that ENF had the highest evaporative efficiency (ET/P). PET and leaf area index (LAI) emerged as the most influential factors explaining ET variability. Artificial neural networks (ANN) and random forest (RF) models demonstrated superior capabilities in predicting monthly ET across sites over generalized additive modeling (GAM) and multiple linear regression (MLR) methods. The present study confirmed that the Southeast region is generally ' energy limited ' , implying that atmospheric demand along with vegetation information can be used to reliably estimate monthly and annual ET. Our study provides valuable insights into how ET of specific ecosystems is controlled by climatic and land surface drivers, enabling the development of reliable predictive models for regional extrapolation of flux measurements in water resource management in the humid southeastern U.S. region.
英文关键词Eddy covariance; Modeling; Land -use change; Budyko; Machine learning
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:001218727200001
来源期刊AGRICULTURAL AND FOREST METEOROLOGY
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/305671
作者单位North Carolina State University; United States Department of Agriculture (USDA); United States Forest Service; Commonwealth Scientific & Industrial Research Organisation (CSIRO); University of Alabama System; University of Alabama Tuscaloosa; United States Department of Agriculture (USDA); United States Forest Service; Clemson University; University System of Georgia; Georgia Institute of Technology; United States Department of Agriculture (USDA); United States Forest Service; Texas A&M University System; Texas A&M University College Station
推荐引用方式
GB/T 7714		 . Energy availability and leaf area dominate control of ecosystem evapotranspiration in the southeastern US[J],2024,349.
APA (2024).Energy availability and leaf area dominate control of ecosystem evapotranspiration in the southeastern US.AGRICULTURAL AND FOREST METEOROLOGY,349.
MLA "Energy availability and leaf area dominate control of ecosystem evapotranspiration in the southeastern US".AGRICULTURAL AND FOREST METEOROLOGY 349(2024).
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