基于3S的黄土高原北部土地沙化分析——以陕西省神木县为例

Monitoring land desertification in northern area of the Loess Plateau by 3S technique——A case study of Shenmu County in Shaanxi Province

采用实地调查和遥感数据分析相结合的方式,分析黄土高原北部神木县的土地沙化变化趋势及社会背景因素,为草地沙化的有效遏制提供依据。结果表明,神木县的土地沙化呈"整体缩小局部扩展"趋势。1986-2004年,沙化土地面积减少了10%(750 km2)。土地沙化在地区间有很大差异,县西北部乡镇里沙化土地减少明显,而南部的黄土峁地区沙化土地有所增加。与社会统计资料对比分析后发现,耕地面积比例大、人均土地面积少的乡镇地区,土地沙化趋势明显。以上结果意味着农田利用对黄土峁地区土地沙化有很大影响,传统耕作方式的改变有助于遏制土地沙化。

The change of land desertification in Shenmu county of northern loess plateau was monitored by combing the field survey and remote sense data and the social factors affecting land desertification were discussed in this study.The results of this study showed that the areas of desertification land decreased by 10% from 1986 to 2004;however,spatial distribution of desertification was different,indicating that the area of desertification land decreased obviously in the northern west region and increased in the ...