干旱区生态环境知识资源中心

In 1988 and 1992, personnel with the Jornada Experimental Range in southern New Mexico chemically treated a large grassland area for mesquite (Prosopis glandulosa). The treatments were successful in defoliating nearly 100% of the mesquite plants present. Since treatment, plant recovery and invasion has resulted in current mesquite densities of about 2% cover. We assessed vegetation index information derived from meteorological satellite imagery recorded over seven growing seasons (1987-1993). The data were used to track the photosynthetic activity of mesquite canopy from pre-treatment through both treatments. Differences in seasonal landscape greenness characteristics derived by analysis of the satellite data show the effect of the chemical treatment, as well as the recovery of the mesquite. This research demonstrates the potential utility of satellite derived information in assessing vegetation response to implementation of range management strategies. Similar techniques applied over longer time periods could be utilized to monitor ecosystem health and aid in managing arid shrublands.