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United States Department of Agriculture (USDA) 2010

QUANTIFYING THE ROLE OF SOIL AND CLIMATE AS CONTROLS OF SEMIARID ECOSYSTEM FUNCTION

Soil Climate Semi-Arid

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : QUANTIFYING THE ROLE OF SOIL AND CLIMATE AS CONTROLS OF SEMIARID ECOSYSTEM FUNCTION

Identification : ARZT-1367190-H21-155

Pays : Etats Unis

Durée : Oct 1, 2010 à Sep 30, 2013

Domaine : Soil, Plant, Water, Nutrient Relationships ; Appraisal of Soil Resources ; Soil and land, general ;

Partenaire : UNIVERSITY OF ARIZONA 888 N EUCLID AVE TUCSON

Objectifs
The overall objective is to integrate digital soil mapping techniques with measures of soil physical properties, soil-water dynamics, and ecosystem production to characterize semi-arid ecosystem response to climate forcing over large areas of southern Arizona. The overall hypothesis is that soil physical properties modulate ecosystem response to climate variability through control of soil-water dynamics and availability. Thus quantifying in detail the spatial patterns of soil physical properties such as clay or rock content provides a first order means to constrain potential ecosystem response to climate forcing. The proposed research involves coupled field and laboratory studies to address this objective and hypothesis : 1. Determine spatial patterns of soil physical properties important to quantifying soil-water availability using a combination of digital soil mapping, field based soil survey and characterization, and pedotransfer functions ; 2. Quantify how site specific soil physical properties modulate temporal patterns of soil-water variability across a range of soil types ; 3. Characterize the temporal and spatial variation in aboveground vegetation productivity as it relates to soil physical properties using a combination of remote sensing and field monitoring techniques.

Descriptif
The proposed work will utilize digital soil mapping techniques to predict the spatial distribution of key soil physical properties required for input to traditional pedotransfer functions for predicting soil hydraulic properties. These data will provide a fundamental core of information regarding potential soil-water availability and dynamics that may be coupled with climate and vegetation data to constrain potential ecosystem productivity. Few of these studies have quantified in detail the high resolution temporal variation in soil-water availability and its relation to aboveground primary productivity. The work proposed here will address this knowledge gap through a combination of site-specific modeling and observation across a range of soil types. These data will explicitly link soil physical and hydraulic properties to aboveground productivity with the goal of transferring this knowledge to larger areas using the digital soil mapping techniques. We propose to combine both intensive ground based monitoring and remotely sensed vegetation indices of vegetation production over short-temporal scales in order to generate a time series of vegetation dynamic at both the local site-specific scale as well as the over larger spatial areas. It is postulated that vegetation dynamics will vary significantly among soil types and that these dynamics will follow soil physical property control of soil-water dynamics and response to local climate forcing

Présentation : USDA

Page publiée le 22 septembre 2015, mise à jour le 9 novembre 2017