图们江区域土壤保持服务空间分布特征研究--以延边朝鲜族自治州为例  

Spatial pattern of soil conservation service in Tumen River region——A case study in Yanbian Korean Autonomous Prefecture,China

作　　者：崔永男 李明玉[1] CUI Yongnan;LI Mingyu(College of Geography and Ocean Science,Yanbian University,Yanji Jilin 133000,China;Forestry Bureau of Helong City,Helong Jilin 133500,China)

机构地区：[1]延边大学地理与海洋科学学院,吉林延吉133000 [2]和龙市林业局,吉林和龙133500

出　　处：《延边大学农学学报》2021年第2期85-91,共7页Agricultural Science Journal of Yanbian University

基　　金：国家自然科学基金(41461036);2019年吉林省“十三五”科学技术项目(JJKH20191124KJ)。

摘　　要：地形因子作为重要的地理驱动要素,对土壤保持服务空间格局具有重要影响。延边朝鲜族自治州地处图们江区域,地貌单元多样,地形条件复杂。该文基于数字高程模型数据提取高程、坡度、地形起伏度和地形位指数,探究土壤保持服务的地形梯度特征。结果表明:1)2015年延边朝鲜族自治州土壤保持服务空间差异大,整体呈西低东高趋势,土壤保持总量为2.69×10^(8) t,单位面积土壤保持量为6254 t/km^(2);2)区域地形呈西高东低趋势,地形因子之间关系复杂,除安图县南部外,坡度、地形起伏度和地形位指数高值区均位于高程中高值区;3)土壤保持服务随地形起伏度的增高而升高,随高程、坡度和地形位指数呈先减少后增加的趋势。依据地形梯度和土壤保持服务之间关系,需要因地制宜地进行土壤规划和管理,为促进土壤资源可持续利用提供科学依据。Topographic factor,as an important driving factor of geography,has an important influence on soil service space pattern.Yanbian Korean Autonomous Prefecture is located in Tumen River region,with diverse geomorphic units and complex topographic conditions.In this paper,DEM was used to extract elevation,slope,topographic relief and topographic position index to explore topographic gradient characteristics of soil conservation service.The results showed that:1)In 2015,Yanbian Korean Autonomous Prefecture had a large difference in the spatial pattern of soil conservation service,with an overall trend of low in the west and high in the east.Thevolume of soil conservation service was 2.69×10^(8) t,and the soil conservation volume per unit area was 6254 t/km^(2).2)The elevation in the region showed a trend of low elevation in the west and low elevation in the east,and the relationship between topographic factors was complex.Except for the southern part of Antu County,the slope,topographic relief and topographic elevation high valueswere all located in the mid-high elevation region;3)Soil maintenance service increased with the increase of topographic,and decreases first and then increases with elevation,slope and topographic position index.According to therelationship between topographic gradient and soil conservation services,planning and management should be adapted to local conditions to provide a scientific basis for promoting sustainable utilization of soil resources.

关 键 词：地形梯度 土壤保持服务 景观格局 延边朝鲜族自治州 

分 类 号：S157[农业科学—土壤学]