岷江上游土地利用变化遥感动态监测

Dynamic monitoring of land use change through RS in the upper Minjiang river

岷江上游作为生态脆弱区,不仅具有得天独厚的林业和牧业资源,更是成都平原和岷江中下游的绿色屏障和天然水库。这里以岷江上游为研究区,基于1994年、2008年、2014年Landsat遥感影像数据提取的土地利用信息,从土地利用的变化方向、数量结构、利用程度等方面对20 a间的土地利用变化状况及区域差异进行分析。结果表明:①岷江上游土地利用类型主要以林地和草地为主;②1994年至2014年间,耕地先增加后减少,林地持续减少,草地先减少后增加,建筑用地持续增加;③各区县土地类型之间存在明显差异,土地利用程度不均衡,其中汶川县和松潘县处于发展期。定量分析岷江上游土地利用分布和程度,对于合理优化空间布局,积极响应国家退耕还林还草政策,推进岷江上游生态文明建设起到积极作用。

As an ecologically fragile area,the upper reaches of the Minjiang river not only have unique forestry and animal husbandry resources,but also serve as a green barrier and natural reservoir for the Chengdu plain,and the middle and lower reaches of the Minjiang river.Taken the upper reaches of the Minjiang river as the research area,and based on the land use information extracted from Landsat remote sensing image data in 1994,2008,and 2014,this paper provided an analysis of the land use change in the 20-year period from the aspects of land use change direction,quantity structure,degree of use and regional differences.The results showed that:(1)the class of land use in the upper reaches of the Minjiang river are mainly woodland and grassland;(2)from 1994 to 2014,area of arable land first increased and then decreased,area of forest land continued to decrease,area of grassland first decreased and then increased,and area of construction land continued to increase;(3)there were obvious differences in land class among districts and counties,and the degree of land use was uneven.Among them,the Wenchuan and Songpan Counties were in the development period.This article quantitatively analyzed the distribution and extent of land use in the upper reaches of the Minjiang river,which played a positive role in rationally optimizing the spatial layout,actively responding to the national policy of returning farmland to forests and grasslands,and promoting the construction of ecological civilization as well in the upper reaches of the Minjiang River.