从农户调查看退耕还林还草工程路径选择问题

在地理信息系统和遥感技术的支持下,综合利用嘉陵江中下游地区的土地利用数据和DEM数据等,分析了该区的耕地资源现状及其对地形因子的响应,以及近50 a来耕地资源的时空变化趋势。结果表明:研究区耕地面积经过长期的增加以后,正在迅速减少,但减少的结构不合理。建议在合理有效退耕还林、保护生态环境的同时,应确保耕地的数量和质量,维护区域粮食安全。

Path Selection in Conversion of Cropland to Forest and Grassland Project in View of Peasant Household Investigation

Based on the technology of GIS and RS,applying the land use coverage data and DEM,the status of cultivated lands,and relations between the cultivated lands and landform in the areas of the middle and lower reaches of the Jialing River were analyzed,we also investigated spatiotemporal variation trend of cultivated land resources in the past 50 years.Results indicate the cultivated land area decreases abruptly after a long-term increase,but structure of the increased lands is unreasonable.So we must pay attention to both quantity and quality,which helps to the ecological environment construction,cultivated land resource uses,reforesting formerly cultivated land inspection,food security and so on.