广西北部湾生态系统构成与格局及其变化评估

采用面向对象的遥感影像解译方法和空间统计分析技术,获取2000、2005和2010年广西北部湾生态系统动态变化信息,深入分析北部湾生态系统类型构成与格局变化特点和演变规律,评估北部湾经济区的生态环境状况,结果表明:北部湾经济区生态系统主要以森林生态系统为主。所有生态系统中,研究期间森林、农田和城镇面积持续增加,而灌丛、草地、湿地反之;草地面积变化率较大;草地转为森林、灌丛转为森林和森林转为农田较为突出;土地覆被转换指数(LCCI)转化强度值反应出北部湾生态系统土地覆被整体转好;而斑块数(NP)、平均斑块面积(MPS)、边界密度(ED)和蔓延度(CONTAG)等指标变化,表明北部湾生态系统的景观异质性、景观的破碎度呈降低的趋势。

Change Evaluation of Ecosystem Composition and Structure base on Beibu Gulf Economic Zone Guangxi

This paper use the object-oriented remote sensing image method and spatial statistical analysis techniques to obtain change information of 2000,2005 and 2010 year in Guangxi Beibu gulf, analysis the change features and evolution law of the Beibu Gulf ecosystem zone from the ecosystem composition and structure, and assess ecological environment. The results showed that the ecosystem of the Beibu Gulf economic zone is mainly composed of forest ecosystem. During the research, the types of forest, farmland and towns is increasing, and the thickets, grassland and wetland is reducing. Also, the change Rate of grassland area is biggest. And the grassland change into forest, shrubs change into forests and forests change into farmland are more and more top. Land cover conversion index (LCCI) transformation strength value indicates that the whole of study area land cover turned for the better, and Landscape heterogeneity and landscape fragmentation shows the tendency of decrease by the change of NP, MPS, ED and CONGTAG index.