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WATER RESOURCES RESEARCH,
VOL. 44,
W03429,
doi:10.1029/2006WR005588,
2008
Vegetation-hydrology dynamics in complex terrain of semiarid areas: 1. A mechanistic approach to modeling dynamic feedbacks
Valeriy Y. Ivanov
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA Center for the Environment, Harvard University, Cambridge, Massachusetts, USA
Rafael L. Bras
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
Enrique R. Vivoni
Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Abstract
Vegetation, particularly its dynamics, is the often-ignored linchpin of the land-surface hydrology. This work emphasizes the
coupled nature of vegetation-water-energy dynamics by considering linkages at timescales that vary from hourly to interannual.
A series of two papers is presented. A dynamic ecohydrological model [tRIBS + VEGGIE] is described in this paper. It reproduces
essential water and energy processes over the complex topography of a river basin and links them to the basic plant life regulatory
processes. The framework focuses on ecohydrology of semiarid environments exhibiting abundant input of solar energy but limiting
soil water that correspondingly affects vegetation structure and organization. The mechanisms through which water limitation
influences plant dynamics are related to carbon assimilation via the control of photosynthesis and stomatal behavior, carbon
allocation, stress-induced foliage loss, as well as recruitment and phenology patterns. This first introductory paper demonstrates
model performance using observations for a site located in a semiarid environment of central New Mexico.
Received 4
October
2006;
accepted 3
January
2008;
published 29
March
2008.
Keywords: ecohydrology;
hydrology;
vegetation-water-energy dynamics;
distributed hydrologic modeling;
semiarid regions;
biophysical and biochemical processes.
Index Terms: 1813 Hydrology: Eco-hydrology; 1878 Hydrology: Water/energy interactions (0495); 1847 Hydrology: Modeling; 1879 Hydrology: Watershed.
Subscriber Access to Full Article (Nonsubscribers may purchase for $9.00, Includes print PDF, file size: 12165731 bytes)
Citation: Ivanov, V. Y., R. L. Bras, and E. R. Vivoni
(2008),
Vegetation-hydrology dynamics in complex terrain of semiarid areas: 1. A mechanistic approach to modeling dynamic feedbacks,
Water Resour. Res.,
44,
W03429,
doi:10.1029/2006WR005588.
Copyright 2008 by the American Geophysical Union.
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