New maps guide rangeland management decisions

New maps guide rangeland management decisions

A NEW tool is now available for guiding decisions about rangeland restoration based on mapping innovations developed by U.S. Department of Agriculture researchers.

Agricultural Research Service (ARS) scientist Brandon Bestelmeyer and others used a variety of ecological data to map environmental factors that affect landscape restoration efforts. The finished maps are called "ecological state" maps.

Bestelmeyer's team paired soil data and vegetation maps with state-and-transition models (STMs) to generate science-based assessments of rangeland conditions across landscapes, ARS said. STMs describe the types of plant communities that can occur on a specific soil type.

Sometimes, beneficial plant communities have persisted despite environmental challenges. Other times, these plant communities have been so altered by invasive plants, soil degradation or other processes that they require management interventions — reseeding, herbicide treatments, changes to grazing or other approaches — in order to be restored, if they can be restored at all.

The team used approximately 6 million acres in southwestern New Mexico for their study. This area features large expanses of desert grassland, savanna and shrubland. However, native shrubs have been encroaching on areas previously covered by perennial grasses, and erosion has degraded soils throughout much of the region.

The researchers used variations in woody cover density, perennial grass cover and soil erosion to develop general "ecological state" categories for plant communities. The team then gathered information on "ecological site" categories in the study area that vary in potential productivity due to climate and soils, ARS explained.

Combining these classifications yielded eight distinct ecological state categories that were mapped using digital soil maps, aerial imagery and field data. These maps can be used for assessing an ecological site's condition and potential for successful restoration.

The final maps delineated ecological state areas ranging in size from a few acres to 10,000 acres throughout southwestern New Mexico. These maps are being used for communication and planning by the U.S. Bureau of Land Management.

Bestelmeyer, who works at the ARS Jornada Experimental Range in Las Cruces, N.M., published results from this project in 2012 in Rangeland Ecology & Management.

Volume:85 Issue:31

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