摘要
以1994年和2001年的TM图像作为原始数据,在GIS技术支持下,对西藏自治区那曲县的草地资源利用和草地退化的现状进行了分析,并在此基础上探讨了草地退化强度变化和草地型动态演替的规律。研究结果表明:那曲县草地资源处于低效利用状态,草地退化现象明显;草地退化强度呈现出从无明显、轻度退化向中、重度退化演替的趋势,主要体现为无明显、轻度退化草地面积比重下降,中、重度退化草地面积比重上升;草地型呈现出从高质量型向低质量型演替的趋势,主要体现为藏北嵩草草地型——高山嵩草草地型、高山嵩草草地型——紫花针茅草地型、藏北嵩草草地型——紫花针茅草地型的转移。
TM images of study area in 1994 and 2001 are chosen as the basic data, using GIS technique, the situation of grassland utilization and grassland degradation is firstly analyzed. Then, the trend of grassland degradation intensity and grassland types succession is discussed. Results show that （1） the grassland resource is in low efficiency development and grassland degradation is serious in Naqu county. （2） Grassland degradation tends to be more and more serious, which can be proved by the decrease of non-degraded and lightly degraded grassland and the increase of medium-degraded and seriously degraded grassland. （3） The constructive species are in reverse succession, which can be proved by the change of K. littledalei into K. pygmaea, the change of K. pygmaea into S. purpurea and the change of K. littledalei into S. purpurea.
出处
《水土保持研究》
CSCD
北大核心
2007年第2期98-100,共3页
Research of Soil and Water Conservation
基金
佛山科学技术学院项目"基于3S技术的草地植被退化与土壤退化互动关系研究"
国家重大基金项目(50099620)资助
关键词
草地退化
动态度
那曲县
grassland degradation
change rate
Naqu county
