喀斯特地区林地地类变化对地形因子的响应——以贵州龙里县为例

Response of Topographic Factors to Forest Land Change in Karst Area: a Case from Longli County of Guizhou Province

以典型的喀斯特地区—贵州省龙里县为研究对象,利用地貌类型和隶属度函数提取喀斯特地貌区域,并对地形因子重新划分等级,建立不同地形等级研究区,利用地类转移矩阵对龙里县2011年至2016年5年间地类相互之间转移变化做出定量分析,并结合重要性指数等指标研究不同地形情况下的地类变化的速度、方向和程度。结果表明,地形起伏度和坡度对地类之间的转移影响较大,海拔影响次之,坡向相关性不大。随着地形起伏以及坡度的变化,各种地类的变化以及相互之间转移速率均呈现规律性。随着地形起伏的增加,乔木林地和非林地移入速率也随之增加,其他地类加快向这两种地类转移。随着坡度的增加乔木林地和非林地趋于稳定,灌木林地变化面积增加,其余地类变化面积基本稳定在相同水平。

By taking a typical Karst area-Longli County of Guizhou Province as a case,through relevant data on Karst landforms were collected through landform type and membership function,and different terrain levels were established through terrain factor classification.Based on Land Transfer Matrix,the land transformation of Longli county from from 2011 to 2016 was constructed and quantitatively analyzed,and several land change indicators on speed,direction and extent were studied.The results showed that terrain relief and slope had the greatest impact on the land type transformation,followed by altitude impact,and low correlation with aspect.With the fluctuation of terrain and the slope change of,the changes of various land types and the transformation rate among them showed a regular rule.With terrain fluctuation increasing,the rate of arbor forest land and non-forest land transfer increased,and other land types had an accelerated tendency to transfer to these two types.With slope increasing,the arbor forest land and non-forest land tend to be stable,the change area of shrub land increased,and the remaining land area kept stable at the same level.