基于遥感技术的退耕还林工程动态监测研究——以四川天全县为例

Dynamic Monitoring on Reforestation Project Using Remote Sensing Technology:Taking Tianquan County as an Example

在1999年SPOT 5遥感图像退耕还林本底解译成果数据的基础上,利用2011年SPOT 5遥感影像作为数据更新的资料,通过遥感图像数字处理和信息提取,对退耕还林工程进行评价。结果表明:1研究区朝着有利于生态环境改善的方向发展,森林覆盖率从63.31%升至63.94%,土地利用变化的突出特征是林地、草地的增加和陡坡耕地、宜林地的减少;2研究区土壤物理性质得到改良,养分含量明显提高,野生动物数量和年均河流量增加;3优化了农村经济产业结构,林业收入总体呈增加趋势。

Based on the data of SPOT 5 remote sensing images in 1999, and digital processing and information extraction from remote sensing image, using SPOT 5 remote sensing image in 2011 as the data update, the paper evaluated the conversion of farmland to forest project. Results showed that： （1）Ecological environment of study area was improved, forest coverage rate rose to 63.94% from 63.31%, the prominent features of land use change was increase of woodland and grassland, decrease of steep cultivated slope land and barren land; （2）The soil physical properties were improved in the study area, the nutrient content was increased obviously, the amount of wild animals and the average annual river discharge was increased ; （3）The industrial structure of rural economy was optimized, the overall trend of forestry income was increased