陕北农牧交错带土地利用景观格局动态变化研究

Landscape Patterns and Their Dynamical Changes in Agricultural and Pasturing Interlaced Zone of Northern Shaanxi Province

利用1986年、1993年和2000年3期遥感资料,基于遥感和GIS技术,选取反映景观格局特征的指数,分析了陕北农牧交错带景观格局及动态变化的特征。结果表明,陕北农牧交错带土地利用景观整体多样性增加,整个景观正从单一景观向多样化的景观过渡,景观类型在空间上呈离散性分布趋势,结构复杂,景观斑块间离散度增大,形状变得较为不规则,整体破碎度逐渐增大。

The landscape patterns and their dynamical changes of agricultural and pasturing interlaced zone of Northern Shaanxi Province in China from 1986 to 2000 are studied using three sets of multi-temporal remotely sensed data of TM, acquired in August of 1986, July of 1993, and August of 2000. Results show that the Shannon＇s diversity index of whole landscape has increased; the whole landscape is conversing from simple to diversified landscape; the landscape types present a dispersed distribution in space; the structure of the landscape becomes more complex. The fragmentation indexes for arable land, forest land, grass land and construct land have increased, which indicates that the disperse index between patches has increased and patch shape becomes more irregular. The fragmentation index of landscape has increased.