近30年来卧龙自然保护区土地覆盖变化动态分析

Dynamics Analysis of Land Cover Changes in Wolong Nature Reserve in Recent 30 Years

以卧龙自然保护区1970、1990、2000年三个时期土地利用数据,结合GIS空间分析技术,对该区域的土地覆盖变化进行动态分析。结果表明,1970￣1990年,卧龙自然保护区土地覆盖变化是很明显的,常绿林面积增加4254 hm2,混交林面积减少3854.76hm2,落叶林面积减少542.97 hm2,灌丛面积增加5170.5 hm2,草地面积减少3987 hm2,耕地减少1261.98 hm2。对土地覆盖变化的动态度和转移矩阵进行分析表明,水体没有明显变化,荒地由无到有,耕地表现为单向式转变,而其他类型表现为双向式转变;从动态监测结果来看,耕地主要向常绿林和灌丛转变;落叶林表现为与常绿林、混交林及灌丛之间的双向变化;常绿林表现为混交林、灌丛及草地之间的双向变化;混交林表现为与落叶林、常绿林及灌丛之间的双向变化;灌丛表现为与常绿林、混交林及落叶林之间的双向变化;草地表现为与灌丛及常绿林之间的双向变化。

Land use/land cover change is the core of global change research. Combining GIS technology and time series of land use data in 1970, 1990 and 2000, land cover and use change in Wolong Nature Reserve was analyzed dynamically. The results showed that there was obvious change in land cover and land use in this area in recent 30 years. Ever green forest and shrub had increased 4 254 hm^2 and 5 170.5 hm^2. And mixed forest, deciduous forest , grassland and farmland decreased 3 854.76 hm^2, 542.987 hm^2, 3987hm^2 and 1261.987 hm^2, respectively. A transformation matrix showed that water had no clearly change and barren had increased. In addition, farmland had one-way change while the other types had two-way changes, Furthermore, dynamic monitoring results implied a complex two-way transformation change.