2003-2023年滇池湿地景观格局变化特征研究
RESEARCH ON THE ECOLOGICAL ENVIRONMENTAL CHANGES IN DIANCHI LAKE WETLANDS BASED ON LANDSCAPE PATTERNS
赵一璐 1温兴平 1王怡晓1
作者信息
- 1. 昆明理工大学国土资源工程学院,昆明 650093;云南省矿产资源预测评价工程实验室,昆明 650093
- 折叠
摘要
滇池湿地是滇池生态系统的重要组成部分,在一定程度上对滇池及其周边城市生态环境具有指示作用.本文以2003-2023年Landsat系列遥感影像为数据源,运用Fragstats 4.2平台,计算将遥感影像通过支持向量机(support vector machine,SVM)分为湖泊湿地、人工湿地、生态缓冲林、农业用地、非湿地5类后专题图的景观格局指数,分析研究区内的景观格局演变情况.得到以下结果:SVM总体分类精度(Overall Accuracy,OA)为 0.86,Kappa 系数(Kappa Coefficient)为 0.83;西山区的部分景观格局变化较小;官渡区非湿地与农业、生态缓冲林景观转化率为90.10％,呈贡区、西山区内非湿地、农业用地景观相互转化率分别为80.17％和91.34％,农业用地和非湿地的相互转化为主要演变.结果表明:研究区内景观格局指数以2007年和2015年为节点,表现为"快速增长-增长减缓-缓慢降低",整体上景观破碎度增强,蔓延度指数增加,多样性和均匀性指数增加,景观趋于复杂,人类活动成为影响滇池湿地景观格局的主要因素.
Abstract
Dianchi Lake wetlands constitute an integral component of the Dianchi Lake ecosystem,playing a pivotal role in indicating the state of the ecological environment of Dianchi Lake and its surrounding urban areas.This study utilizes Landsat series remote sensing imagery from 2003 to 2023 as its data source and employs the Fragstats 4.2 platform.It classifies remote sensing imagery into five categories:lacustrine wetlands,artificial wetlands,ecological buffer forests,agricultural lands,and non-wetlands,using support vector machine(SVM)classification.The study calculates landscape pattern indices for the resulting thematic maps and investigates the evolution of landscape patterns within the study area.The findings are as follows:The overall accuracy(OA)of the SVM classification is 0.86,and the Kappa coefficient is 0.83.Parts of the Xishan District exhibit minor landscape pattern changes.In Guandu District,the rate of transformation of non-wetlands into agriculture and ecological buffer forests is 90.10％,while in Chenggong District and Xishan District,the mutual transformation rate between non-wetlands and agricultural lands is 80.17％and 91.34％,respectively.The primary evolution involves mutual conversions between agricultural lands and non-wetlands.The results indicate that landscape pattern indices in the study area exhibit distinct transitions in 2007 and 2015,manifesting a progression characterized by"rapid growth-diminished growth-gradual decline."Overall,there is an increase in landscape fragmentation,sprawl index,diversity,and evenness indices,signifying a heightened landscape complexity.Human activities emerge as the principal factor influencing the landscape pattern of Dianchi Lake wetlands.
关键词
遥感/景观生态/景观格局/湿地/滇池Key words
remote sensing/landscape ecology/landscape pattern/wetlands/Dianchi lake引用本文复制引用
出版年
2024
NETL
NSTL
万方数据