It is a good question. Actuelly exist several direct impact such as a decrease in crop production, fewer amount of water to disposition for plants, increase of the percentage of arid land, fewer rainfall, more temperature, more plant diseases, increase of the electric conductivity in soil, NDVI decrease, etc.
Because of the climate change the vegetation coverage will gradually change in terms of structure and content (species), and in some cases will be gradually degrading. At the same time, landscapes are in some cases strongly influenced by human activities. So, this double effect will increase the lost of the fragile land cover patters. Briefly, like this.