旅顺口区土地退化分区分级研究

目的]随着社会经济的高速发展,资源开发规模和强度不断扩大,土地退化的问题也逐渐显现出其弊端。方法]文章以2003年、2006年、2009年的旅顺口区土地利用数据为基础,运用GIS软件的叠置分析,空间分析对研究区土地退化分区分级研究。通过掌握土地利用变化的数量、时空模式及变化趋势来揭示研究区在不同时期、不同资源开发强度下土地退化的时空特征。结果]研究表明,研究区的土地退化类型在2003~2009年主要为土地污染、次生盐碱化、草地退化;荒草地和耕地面积在6年间共减少2068.12hm2,耕地土地利用动态度为-2.85%,荒草地土地利用动态度为-2.37%,建设用地土地利用动态度为2.25%,其他未利用地土地利用动态度为6.84%;在不同的研究时期和区域,土地退化的强度不同;根据分区区域面积加权计算,旅顺口区的耕地退化指数小于3,预计土地退化程度属于轻度退化,研究结果可信。结论]旅顺口区土地退化分区分级研究为今后旅顺口区的社会经济发展战略的决策和生态环境的管理提供了科学依据。

STUDY ON PARTITION AND GRADING OF LAND DEGRADATION IN LVSHUNKOU DISTRICT

Based on the land use map of LVshunkou district in 2003,2006 and 2009, this paper analyzed the partition and grading of land degradation using the overlay analysis, spatial analysis, the attribute query, and mapping technology with the support of GIS software.and then it revealed the temporal and spatial characteristics of land degradation in different periods and different resources development intensity by understanding the quantity, spatial and temporal patterns, and changing trends of land use change.The results showed that the degradation of the study area of land types in 2003-2009 years were mainly land pollution, secondary salinization, grassland degradation.The grassland and cultivated land area in 6 years totally reduced 2068.12 hm2,the dynamic degree of land use of cultivated, grassland, and construction land was-2.85%,-2.37%,and 2.25%,respectively.The land degradation strength was different in different periods and regions.The land degradation index in Lvshunkou district was less than 3, which indicated the land degradation degree was slightly degraded.