摘要
选取1985、2000年Landsat5 TM及2015年Landsat8 OLI遥感影像为数据源,以格网化为基础,分别利用转移矩阵和景观类型转化强度指数对南四湖湿地近30年的景观类型转移状况、生态等级变化情况进行定量时空分析,结果表明:(1)近30年来南四湖自然湿地面积逐年下降,人工湿地面积逐年上升,非湿地略有增加,由1985年自然湿地为主导的"湖泊-芦苇-荷田"景观结构转变为2015年人工湿地主导的"养殖水面-水稻田-湖泊"结构;(2)湖区主要呈现出大量自然湿地向人工湿地转移的趋势,转出面积最显著的是芦苇,为501.88 km2,主要转化为养殖水面、水稻田。转入面积最大的是养殖水面,为305.70 km2,主要由芦苇、荷田及湖泊转化而来;(3)1985~2000、2000~2015和1985~2015年景观类型转化强度指数值分别为-0.73、-0.40和-1.12,景观生态等级降低,宏观生态状况驱差,但后15年较前15年生态转差程度有所减缓,转化剧烈区域分布在最容易被人为垦殖的湖区东西两侧。
Transition matrix and the index of landscape type change intensity were used to the quantitative spatiotemporalanalysis of the landscape type transfer and the changes of ecological grade in Nansi Lake wetland, Landsat5 TM in 1985,2000 and Landsat8 OLI remote sensing images in 2015 as data sources and grid model as the basis. The results showed that：① In the past 30 years, the natural wetland in Nansihu Lake has decreased year by year, the artificial wetland has increasedyear by year, and the non-wetland has increased slightly. The Landscape structure of ＂Lake, Reed and Lotus＂ dominated bynatural wetlands in 1985 was transformed into the ＂Aquaculture water, Rice paddy Field and Lake＂ structure dominated byartificial wetlands in 2015. ②There was a trend that a large number of natural wetlands were transferred to artificial wetlandsin the lake area. The most significant reduced area was reed with 501.88 km2, which was mainly transformed into aquaculturesurface and rice fields. The largest expanded area was aquaculture water with 305.70 km2, and it primarily came from reed,lotus fields and lake. ③The change intensity index values of landscape types in 1985/2000, 2000/2015 and 1985-2015 were -0.73/-0.40 and -1.12, respectively. The landscape ecological grade was reduced, the macro ecological condition becameworse, the degree of ecological deterioration in the latter 15 years had slowed down, and the region with the greatesttransformation was on the east and west sides of the lake, which was most susceptible to artificial reclamation.
作者
梁佳欣
李新举
高峰
许燕
LIANG Jia-xin;LI Xin-ju;GAO Feng;XU Yan(College of Resources and Environment/Shandong Agriculture University, Tai’an 271018, China;Management Center of Coal Mine Subsidence, Bureau of Natural Resources of Jining, Jining 272017, China)
出处
《山东农业大学学报（自然科学版）》
CSCD
北大核心
2018年第3期433-437,443,共6页
Journal of Shandong Agricultural University：Natural Science Edition
基金
国家自然科学基金项目(41171425)
关键词
南四湖湿地
转移矩阵
景观类型转化强度
格网化
景观时空变化
Nansi Lake wetland
transition matrix
landscape type change intensity
grid model
spatio-temporal variations oflandscape
