| Mountainous land use and land cover change, as a primary and important factor in weighing the change of the mountainous ecological environment, has received a lot of attention. The northern part of Ailao Mountain, located in the middle of Yunnan province, was selected as study area. Based on three Landsat MSS /TM/ETM satellite images, as well as"3S"technology combining with the method of mathematical statistics,the objective of this paper was to analyze the law of spatial(gradient, slope orientation and elevation) and temporal changes in land use/land cover on the northern part in the periods of 1974～1987 and 1987～2003. And analyzes land use/land cover change character in nature reserve and its meighbour region within the confine of the study area. It will prove to be meaningful in guiding the sustainable land use and the conservation of the environment in the Ailao Mountain.The main results were as follows:From the perspective of time succession, the type of land use in northern part of Ailao mountain has undergone violent change between 1974～2003. For both periods (1974～1987 and 1987～2003) forest land was the dominant type of land use, but this dominance was weakening, for example, in 1974～2003 the forest land decreased form 266076hm2 to 240249 hm2. In 1974～1987, dry land's net increase was 40217 hm2, and this was mainly resulted from the cut down of the woods, and in 1987～2003 the net decrease of dry land was 27827hm2, which were mainly converted into paddy field, forest land and shrub land. The grass land's changing trend was just the opposite with the forests, with a net decrease of 39224hm2 in 1974～1987, which were mainly converted into forests, paddy field and dry land, and a net increase of 8864 hm2 in 1987～2003, which was from dry land. Paddy field and shrub land have both increased in these two periods. The intensive human disturbance within the region had increased the landscape diversity index and evenness index, a decrease of... |
PDF Full Text Request