黑龙江省西南部土地沙漠化敏感性评价

Study on Land Desertification Sensitivity Evaluation in South-west Heilongjiang Provence

以黑龙江省西南部的土地沙漠化敏感性为研究对象,从自然和人为影响因素中选取湿润指数、土壤类型、起沙风的天数、植被覆盖和景观破碎度等5个因子作为评价指标,按土地沙漠化敏感度的高低将研究区划分为5级:极高敏感区、高敏感区、中敏感区、低敏感区和不敏感区,在GIS技术的支持下对研究区的土地沙漠化敏感性进行评价。结果表明:评价区域内有88.9%的面积为轻度敏感和中度敏感,有15.3%的区域为高度敏感,无极敏感区域;从土地沙漠化敏感性的空间分布来看具有从西南向东北具有逐渐降低的趋势;最后结合沙漠化敏感性的等级,提出了防治土地沙漠化的建议。

With the land desertification sensitivity of the south-west Heilongjiang province as a research object, five factors, such as moisture index, the soil types, days of wind speed＆gt;6 m/s, vegetation covering degree and fragmentation are chosen to assess the desertification sensitivity based on GIS. Five classes of land desertification sensitivity ranging from low to extreme were generated： non-sensitivity zone, low sensitivity zone, moderate sensitivity zone, high sensitivity zone and extreme sensitivity zone. The result show that about 88.9% of study area are low sensitivity or moderate sensitivity, 15.3% of which is in high sensitivity and non in extreme sensitivity; the desertification sensitivity in the whole region is decreasing from south-west to north-east from the spatial distribution; At last the advices and countermeasures for different zones are put forward.