云南省岩溶地区土地利用对石漠化景观格局演变的影响分析
收稿日期: 2021-12-14
修回日期: 2022-01-10
网络出版日期: 2022-03-31
基金资助
国家自然科学基金项目(32160405);云南省“万人计划”人才培养项目(YNWR-QNBJ-2018-334)
Influence of Land Use on Landscape Pattern Evolution of Rocky Desertification in Karst Areas of Yunnan,China
Received date: 2021-12-14
Revised date: 2022-01-10
Online published: 2022-03-31
以云南省为研究区,基于GlobeLand30获取土地利用分布数据,对Landsat影像进行决策树分类,获取石漠化等级分布数据,定量分析云南省岩溶地区土地利用对石漠化景观格局演变的影响程度,结果表明:1)2000—2020年云南岩溶地区土地利用类型以耕地、林地及草地为主,耕地与建设用地面积逐年增加;2)无石漠化面积逐年增加,重度石漠化面积逐年减少,整体石漠化等级有所改善,高等级石漠化斑块面积减少,即优势度降低;3)石漠化主要发生在林地与草地,发生于耕地的石漠化面积呈增加趋势,发生于林地和灌木的石漠化面积除极重度等级外,均呈减少趋势;4)土地利用及石漠化景观格局的面积周长维数分别降低了0.000 7和0.002 2,而凝聚度指数、聚合度指数、分离度指数、香浓多样性和香农均匀度均呈负相关,石漠化景观类型的复杂程度随土地利用的变化而降低,石漠化状况持续改善。研究将有助于对石漠化治理成效进行宏观定量评估,为今后生态恢复及石漠化科学治理提供依据。
田湘云 , 张超 , 陈棋 , 史小蓉 , 王妍 . 云南省岩溶地区土地利用对石漠化景观格局演变的影响分析[J]. 林草资源研究, 2022 , 0(1) : 61 -69 . DOI: 10.13466/j.cnki.lyzygl.2022.01.008
In order to explore the land use types and the temporal and spatial characteristics and evolution laws of rocky desertification grades in karst areas of Yunnan Province,the effects of different land use types on rocky desertification grades were analyzed. The data of land use type was obtained based on GlobeLand30,and the data of rocky desertification grade was obtained by using ENVI to classify the decision tree of Landsat image. The spatial analysis of land use type and rocky desertification landscape pattern were carried out by ArcGIS and Fragstats. The results in the karst area of Yunnan from 2000 to 2020 showed that: 1) The main types of land use were cultivated land,woodland and grassland,and the area of cultivated land and construction land was increased year by year. 2)The area of non-rocky desertification increased year by year,the area of severe rocky desertification decreased year by year,the overall grade of rocky desertification tended to improve,and the area of high-grade rocky desertification patch decreased,namely the dominance decreased. 3) Rocky desertification mainly occured in woodland and shrubbery,the area of rocky desertification in cultivated land showed an increasing trend,and the area of rocky desertification in woodland and grassland showed a decreasing trend except for the grade of extremely severe rocky desertification. 4) The PAFRAC of land use type and rocky desertification landscape pattern decreased by 0.0007 and 0.0022 respectively,while COHESION,AI,DIVISION,SHDI and SHEI showed negative correlation. The complexity of rocky desertification landscape type decreased with the change of land use landscape type,and the situation of rocky desertification improved continuously. This study was helpful to evaluate the effectiveness of rocky desertification control and provided a scientific basis for ecological restoration and rocky desertification control in the future.
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