There are, however, several publicly available

There are, however, several publicly available find protocol remote sensing and GIS-based products that are potentially useful as surrogates for these factors. Three data sources that might be Inhibitors,Modulators,Libraries useful for the spatially explicit estimation of pre-growing season soil water content are Landsat imagery, 30-m resolution digital Seliciclib CDK2 elevation models (DEMs), and digitized soil surveys with associated attribute data available from the U.S. National Cooperative Soil Survey (NCSS).Landsat multispectral Inhibitors,Modulators,Libraries satellite imagery might be used to account for the empirical relationship between evapotranspiration and the spatial distribution of soil water. Landsat imagery has been used to estimate accurately leaf area [6], which in turn should be highly correlated to evapotranspiration [7].

Empirical relationships Inhibitors,Modulators,Libraries Inhibitors,Modulators,Libraries between evapotranspiration and soil water content are site-and-date-specific, but are considerably easier to develop at a ranch scale than mechanistic modeling approaches. Such empirical models avoid the radiometric correction and universal calibration issues Inhibitors,Modulators,Libraries that mechanistic remote sensing-based models must confront. Satellite imagery also has been used to directly estimate soil Inhibitors,Modulators,Libraries water [e.g., 8], but the characteristics of the imagery have resulted in a focus on surface soil water, which is highly important for certain applications, but not particularly valuable Inhibitors,Modulators,Libraries for estimating plant growth, which is a function of water at plant rooting depths.DEMs can be used to derive hydrologically important topographic variables such as slope and aspect.

Topographic variables can be used to account for relative amounts of evapotranspiration across a landscape [9].

Terrain has been shown to be a better predictor of soil water content in wet versus dry conditions [9, 10]. Soil water content in semi-arid Montana environments, however, has been found to have limited correlation AV-951 Inhibitors,Modulators,Libraries with terrain subdivisions and topographic indices [10, 11].Soil water distribution might be more closely related to hydrologically important soil characteristics, such as texture, than to topographic variables in semi-arid Montana rangelands [10]. NCSS soil surveys provide one source of spatially explicit soil attribute data that might be appropriate for modeling soil water at a ranch scale.

Soil surveys, however, have limited accuracy [12]. Attribute selleck chemicals llc data is often interpolated and/or extrapolated from a handful of lab characterized pedons for an entire survey area [13].

The addition of site-specific soils data to soil water content models based on soil survey and terrain data has been recommended for future research in semi-arid Montana agricultural systems [10].The Dacomitinib overall goal of this study was to assess the ability of Landsat and ancillary soil and terrain data to model accurately BML-275 spring soil water content in semi-arid rangelands of the NGP.

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