摘要
四川省若尔盖保护区不仅是重要的水源涵养地且生物多样性丰富,对该地区进行景观生态格局动态分析有利于若尔盖高原湿地资源的科学保护和利用。选用2004、2009年Landsat5 TM影像和2014、2016年Landsat8 OLI遥感数据,在ENVI5.5软件平台中对其进行不同时相影像的配准、融合、裁剪等预处理后,采用监督分类方法,将研究区景观分为湖泊、沼泽、高覆盖度草甸、低覆盖草甸、沼泽化草甸和沙化地/裸地6种类型,并通过分类后比较法得到景观类型转移矩阵。最后,利用Fragstats4.2软件选取了8个主要景观指标,对若尔盖保护区的景观格局进行了斑块类型和景观水平的对比分析。结果表明:(1)2004—2016年间,沼泽、沼泽化草甸等景观向低、高覆盖度草甸转变的趋势尤为明显;(2)2004—2016年间,沼泽面积逐步减少;2009年后,沼泽面积趋于稳定,减少速率变小;(3)总体上,若尔盖保护区的基本景观生态格局变化不大,草甸是研究区优势度最高的景观类型。
Zoige Nature Reserve in Sichuan province is not only an important water resource conservation area,but also one of the key biodiversity areas in China.Dynamic analysis of landscape ecological pattern in this area is beneficial for scientific protection and utilization of wetland resources in Zoige Plateau.In this paper,Landsat5 TM images in 2004 and 2009 and Landsat8 OLI remote sensing data in 2014,2016 were selected,and the landscape of the study area was divided into lakes,swamps,high-coverage meadows,low-coverage meadows,swamped meadows and desertification by using supervised classification method after the preprocessing of registration,fusion and cropping of images in different phases in ENVI5.5 software platform.At last,eight major landscape indexes were selected using Fragstats4.2 software,and the landscape pattern of Zoige Nature Reserve was compared and analyzed at patch types and landscape levels.The results showed that:(1)From 2004 to 2016,the landscape such as swamps and swamped meadows shifted to low-coverage and high-coverage meadows;(2)From 2004 to 2016,the swamp area gradually decreased.After 2009,the swamp area tended to be stable and the decreasing rate slowed down;(3)In a word,the basic landscape ecological pattern of Zoige Nature Reserve has slight change,and the meadow is the most dominant landscape type in the study area.
作者
冯佳
董鑫
赵姗姗
FENG Jia;DONG Xin;ZHAO Shanshan(Collge of Environmental Science and Engineering,China West Normal University,Nanchong 637000,China;Nanchong Key Laboratory of Ecological Environment Protection and Pollution Prevention in Jialing River Basin,China West Normal University,Nanchong 637000,China;Key Laboratory of Southwest China Wildlife Resource Conservation(Ministry of Education),Nanchong 637009,China;Collge of Management,China West Normal University,Nanchong 637000,China)
出处
《四川林业科技》
2021年第1期52-59,共8页
Journal of Sichuan Forestry Science and Technology
基金
西华师范大学青年教师科研资助项目(19D041)。
关键词
若尔盖保护区
景观格局
动态分析
Zoige Nature Reserve
Landscape pattern
Dynamic analysis
