毛乌素沙地南缘沙地-荒漠草原景观 界面的判定

he experiment was carried out in Yanchi. Data on vegetation and soil properties collected on three 3.1-4.4km parallel transects at 100m intervals across sandy land/desert steppe transition zone were used to detect boundary location along the sandy land/grassland ecotone by using the moving split-window. Different desertification categories were divided along the sandy land/grassland transition zone. The results showed that: The boundaries detected using vegetation and soil properties overlapped, but they were not exactly congruent. Combining the dissimilarity profiles of soil particle size with importance value of plants, three boundaries were detected across sandy land/desert steppe ecotone. According to the three boundaries, we divided the whole transition zone into four desertification categories: shifting and semi-shifting dune, fixed and semi-fixed dune, saline bottomland and gentle slope hilly ridge.