喀斯特山区不同强度石漠化与人口因素空间差异性的定量研究

利用喀斯特石漠化生态脆弱区2004年的ASTER遥感影像,在GIS操作平台上获取了研究区喀斯特石漠化景观和人口分布信息,用数学方法定量分析了石漠化比重与人口指标的相互关系,并建立起与之相应的数学模型。结果表明:石漠化的严重程度只与人口密度、农户居住的聚集程度及单位面积上的壮劳动力数量等3个人口指标有密切关系,与其他人口指标关系不大,且不同强度石漠化的人口影响因子不同,数学关系迥异。在石漠化严重的地区,人口密度、农户居住的聚集程度、单位面积上的劳动力数量等人口指标相对较低。人口主要集中分布在石漠化面积比例相对较小的地区,但这些区域的潜在石漠化比例却相对较高,这是值得引起重视的。

Quantitative Research of the Space Dependence of Different Grades Rocky Desertification and the Factor of Population in Karst Mountain Area

The authors utilized ASTER remote sensing image in 2004 of fragile karst rocky desertification district, and GIS operating platform, obtained the karst rocky desertification data and population distribution information of the studied area. With the mathematics method, the interreaction of proportion of rocky desertification and population indexes was opened out quantifficationally. The result shows as follows: the proportion and the severity of rocky desertification has only close relations with the density of population, gathering degree of peasants and strong work force quantity, which has not relations with other indexes of people. In addition, the influencing factor are so different in the area of various grades rocky desertification, and mathematics relations are different too. In serious rocky desertification area, the indexes of density of population, gathering degree of peasants, workforce quantity are relatively lower. The population are mainly distributed in slight rocky desertification region relatively, however, the proportion of potential rocky desertification is higher in this kind of region, which deserves paying much more attention.