LAUSR

Rangelands in arid and semi-arid regions are the main source of livestock feed. The fragmentation of these ecosystems by continuous grazing gives rise to the modification of ecological processes, which alters the structure and functionality of plant communities. Therefore, the use of geographic information systems and the analysis of satellite images are important to monitor spatial changes and to evaluate these areas in the Tamaulipan Highlands of northeastern Mexico. This work aimed to evaluate the current state of the rangelands and to determine the percentage of modified areas as well as propose the time of permanence, succession, or recovery of five different areas destined for rangelands. For the analysis, Landsat satellite scenes from the period 1973–2020 were used: they were classified into four categories using segmentation and maximum likelihood analysis, as well as a cross-tabulation method to determine the degree of succession. An increase in rangelands was found in three of the five areas analyzed in the period from 1973 to 2020. As rangeland areas increase, the coverage of pine–oak forests, submontane–thorny scrub, and anthropogenic areas, decreases. The disturbance processes were not linear, and the increase in rangeland areas was greater in xerophilous scrub and secondary vegetation. This work is the first contribution that evaluates the changes in land use and cover in grazing areas compromised by continuous grazing in the Tamaulipan Highlands and Mexico. In addition, the results indicate the importance of performing studies based on the coexistence of wildlife and livestock as well as the interaction between soil degradation and plant diversity with the increase in rangelands.