A general predictive model for estimating monthly ecosystem evapotranspiration

Accurately quantifying evapotranspiration (ET) is essential for modelling regional‐scale ecosystem water balances. This study assembled an ET data set estimated from eddy flux and sapflow measurements for 13 ecosystems across a large climatic and management gradient from the United States, China, and Australia. Our objectives were to determine the relationships among monthly measured actual ET (ET), calculated FAO‐56 grass reference ET (ETo), measured precipitation (P), and leaf area index (LAI)—one associated key parameter of ecosystem structure. Results showed that the growing season ET from wet forests was generally higher than ETo while those from grasslands or woodlands in the arid and semi‐arid regions were lower than ETo. Second, growing season ET was found to be converged to within ± 10% of P for most of the ecosystems examined. Therefore, our study suggested that soil water storage in the nongrowing season was important in influencing ET and water yield during the growing season. Lastly, monthly LAI, P, and ETo together explained about 85% of the variability of monthly ET. We concluded that the three variables LAI, P, and ETo, which were increasingly available from remote sensing products and weather station networks, could be used for estimating monthly regional ET dynamics with a reasonable accuracy. Such an empirical model has the potential to project the effects of climate and land management on water resources and carbon sequestration when integrated with ecosystem models. Copyright © 2010 John Wiley & Sons, Ltd.

[1]  Xiaohua Wei,et al.  Annual runoff and evapotranspiration of forestlands and non‐forestlands in selected basins of the Loess Plateau of China , 2011 .

[2]  J. Vose,et al.  Quantifying structural and physiological controls on variation in canopy transpiration among planted pine and hardwood species in the southern Appalachians , 2011 .

[3]  G. Sun,et al.  Robbing Peter to pay Paul: tradeoffs between ecosystem carbon sequestration and water yield. , 2010 .

[4]  R. W. Skaggs,et al.  Energy and water balance of two contrasting loblolly pine plantations on the lower coastal plain of North Carolina, USA , 2010 .

[5]  A. Noormets,et al.  Response of carbon fluxes to drought in a coastal plain loblolly pine forest , 2010 .

[6]  B. Ewers,et al.  Evapotranspiration in intermediate‐aged and mature fens and upland black spruce boreal forests , 2009 .

[7]  Jiquan Chen,et al.  Energy balance and partition in Inner Mongolia steppe ecosystems with different land use types , 2009 .

[8]  G. Sun,et al.  Water and carbon dynamics in selected ecosystems in China , 2009 .

[9]  Jiquan Chen,et al.  Cultivation and grazing altered evapotranspiration and dynamics in Inner Mongolia steppes , 2009 .

[10]  S. Rambal,et al.  Long‐term transpiration change with rainfall decline in a Mediterranean Quercus ilex forest , 2009 .

[11]  R. B. Jackson,et al.  Ecohydrology in a human‐dominated landscape , 2009 .

[12]  Ge Sun,et al.  Sensitivity of pine flatwoods hydrology to climate change and forest management in Florida, USA , 2009, Wetlands.

[13]  A. Noormets,et al.  Poplar plantation has the potential to alter the water balance in semiarid Inner Mongolia. , 2009, Journal of environmental management.

[14]  Ge Sun,et al.  Impacts of Multiple Stresses on Water Demand and Supply Across the Southeastern United States 1 , 2008 .

[15]  John A. Stanturf,et al.  Modeling the Potential of the Northern China Forest Shelterbelt in Improving Hydroclimate Conditions 1 , 2008 .

[16]  Julien Lerat,et al.  Has land cover a significant impact on mean annual streamflow? An international assessment using 1508 catchments , 2008 .

[17]  Ge Sun,et al.  Drought during canopy development has lasting effect on annual carbon balance in a deciduous temperate forest. , 2008, The New phytologist.

[18]  M. Zeppel,et al.  The response of sap flow to pulses of rain in a temperate Australian woodland , 2008, Plant and Soil.

[19]  Ge Sun,et al.  Evapotranspiration estimates from eddy covariance towers and hydrologic modeling in managed forests in Northern Wisconsin, USA , 2008 .

[20]  Ge Sun,et al.  Estimating Forest Ecosystem Evapotranspiration at Multiple Temporal Scales With a Dimension Analysis Approach 1 , 2008 .

[21]  M. Zeppel,et al.  Long term trends of stand transpiration in a remnant forest during wet and dry years , 2008 .

[22]  Maosheng Zhao,et al.  Development of a global evapotranspiration algorithm based on MODIS and global meteorology data , 2007 .

[23]  J. Vose,et al.  A comparison of sap flux-based evapotranspiration estimates with catchment-scale water balance , 2007 .

[24]  R. Scott,et al.  Partitioning of evapotranspiration and its relation to carbon dioxide exchange in a Chihuahuan Desert shrubland , 2006 .

[25]  M. Zeppel,et al.  Daily, seasonal and annual patterns of transpiration from a stand of remnant vegetation dominated by a coniferous Callitris species and a broad-leaved Eucalyptus species , 2006 .

[26]  U. KyawThaPaw.  Unifying biomicrometeorological measurements , 2006 .

[27]  M. Battaglia,et al.  Above- and below-ground relationships, with particular reference to fine roots, in a young Eucalyptus globulus (Labill.) stand in southern Tasmania , 2006, Trees.

[28]  Bruce A. McCarl,et al.  Trading Water for Carbon with Biological Carbon Sequestration , 2005, Science.

[29]  S. Carpenter,et al.  Global Consequences of Land Use , 2005, Science.

[30]  Ge Sun,et al.  A COMPARISON OF SIX POTENTIAL EVAPOTRANSPIRATION METHODS FOR REGIONAL USE IN THE SOUTHEASTERN UNITED STATES 1 , 2005 .

[31]  Andrew W. Western,et al.  A rational function approach for estimating mean annual evapotranspiration , 2004 .

[32]  K. Wilson,et al.  OAK FOREST CARBON AND WATER SIMULATIONS: MODEL INTERCOMPARISONS AND EVALUATIONS AGAINST INDEPENDENT DATA , 2004 .

[33]  Alan G. Barr,et al.  Year‐round observations of the energy and water vapour fluxes above a boreal black spruce forest , 2003 .

[34]  Ge Sun,et al.  MODELING ACTUAL EVAPOTRANSPIRATION FROM FORESTED WATERSHEDS ACROSS THE SOUTHEASTERN UNITED STATES 1 , 2003 .

[35]  W. Oechel,et al.  Energy balance closure at FLUXNET sites , 2002 .

[36]  W. Oechel,et al.  Environmental controls over carbon dioxide and water vapor exchange of terrestrial vegetation , 2002 .

[37]  F. Chapin,et al.  Principles of Terrestrial Ecosystem Ecology , 2002, Springer New York.

[38]  Douglas E. Ahl,et al.  Tree species effects on stand transpiration in northern Wisconsin , 2002 .

[39]  R. B. Jackson,et al.  Water in a changing world , 2001 .

[40]  Lu Zhang,et al.  Response of mean annual evapotranspiration to vegetation changes at catchment scale , 2001 .

[41]  Dennis D. Baldocchi,et al.  A comparison of methods for determining forest evapotranspiration and its components: sap-flow, soil water budget, eddy covariance and catchment water balance , 2001 .

[42]  R. Betts.  Offset of the potential carbon sink from boreal forestation by decreases in surface albedo , 2000, Nature.

[43]  Kevin J. McGuire,et al.  Potential effects of climate change and urbanization on mean annual streamflow in the United States , 2000 .

[44]  Stan D. Wullschleger,et al.  A review of whole-plant water use studies in tree. , 1998, Tree physiology.

[45]  Charles J Vörösmarty,et al.  Potential evaporation functions compared on US watersheds: Possible implications for global-scale water balance and terrestrial ecosystem modeling , 1998 .

[46]  P. Milly.  Climate, soil water storage, and the average annual water balance , 1994 .

[47]  R. W. Skaggs,et al.  Hydrologic Model for Drained Forest Watershed , 1992 .

[48]  D. Currie.  Energy and Large-Scale Patterns of Animal- and Plant-Species Richness , 1991, The American Naturalist.

[49]  J. D. Helvey.  Interception by eastern white pine , 1967 .

[50]  Patricia M. Cisarik,et al.  A Comparison , 1913, Texas medical journal.

[51]  G. D,et al.  American Naturalist , 1867, Nature.

[52]  A. Noormets,et al.  WATER AND CARBON CYCLES IN HETEROGENEOUS LANDSCAPES : AN ECOSYSTEM PERSPECTIVE , 2007 .

[53]  Carl C. Trettin,et al.  Annual evapotranspiration of a forested wetland watershed, SC , 2007 .