重庆市岩溶区县土地利用景观破碎化及土壤侵蚀影响评价  

Estimation on the effect of soil erosion and land-use landscape fragmentation in Chongqing karst area

作　　者：彭月[1,2] 王建力[1,2] 魏虹[3,2] 李清[1,2] 

机构地区：[1]西南大学地理科学学院,重庆400715 [2]三峡库区生态环境教育部重点实验室,重庆400715 [3]西南大学生命科学学院,重庆400715

出　　处：《中国岩溶》2008年第3期246-254,共9页Carsologica Sinica

基　　金：重庆市院士基金专项项目(2003-7835);中国博士后科学基金资助项目(2003033483)

摘　　要：根据重庆岩溶区县土地利用景观破碎情况,采用双向指示种分析法和除趋势典范对应分析法对研究区县及各土地利用类型进行分类和排序,揭示其空间分布的景观生态学意义及土壤侵蚀对土地利用景观破碎化的影响。根据分析结果,可将研究区22种土地利用类型分为未利用地、平原耕地、山地耕地和灌草地4大类;可将研究区25个区县样方可分为低脆弱剧烈破碎区;低脆弱极强破碎区;低脆弱强破碎区;中脆弱中强破碎区;重脆弱中破碎区;重脆弱轻破碎区;中脆弱微破碎区7个样方群,空间上它们分属于渝东部、渝中部和渝西部3个区域,其土壤侵蚀性从东往西逐渐减弱。除趋势典范对应分析结果表明,较强的土壤侵蚀会加剧土地利用景观的破碎化,加剧破碎化的强度同土壤侵蚀等级呈现出相反的趋势。In order to reveal the landscape ecologic meaning and the influence to soil erosion by land-use type, the land-use type in the study area are classified and ordered by means of Two-way indicator species analysis （TWINSPAN） and Detrended canonial correspondence analysis （DCCA） on the basis of land-use landscape fragmentation in Chongqing karst region. The result shows that there are four types of land-use： Un-uses land, Plain farming, Knap farming, Shrub land and Grassland. The 25 studying quadrats are sorted into 7 quadrat clusters （ i.e. Low eco-environment grade and severe fragmentation ; Low eco-environment grade and very intensive fragmentation; Low eco-environment grade and intensive fragmentation; Middle eco-environment grade and middle intensive fragmentation; High eco-environment grade and middle fragmentation; High eco-environment grade and light fragmentation; Middle eco-environment grade and tiny fragmentation） that located in 3 areas （west of Chongqing, middle of Chongqing and east of Chongqing） from east to west, and the soil erosion rank decreased accordingly. The DCCA result show the strong soil erosion enhanced the landscape fragmentation, but the strength orders and the soil erosion rank goes by contraries （intensive erosion〉very intensive erosion〉severe erosion）.

关 键 词：岩溶 土地利用 景观破碎化 生态脆弱度 土壤侵蚀 重庆市 

分 类 号：F301.24[经济管理—产业经济] S157.1[农业科学—土壤学]