黄龙县土地利用景观格局及其破碎化分析

GIS-based analyses of landscape pattern and landscape fragmentation of Huanglong County

目的揭示黄龙县土地利用景观格局,评价景观破碎化程度,为进一步决策提供科学依据。方法以黄龙县土地利用现状图为基本图件,利用地理信息系统(GIS)技术,结合景观格局分析软件Fragstats(栅格版),选取多种景观格局指标进行现状及其破碎化评价。结果①黄龙县土地利用的景观基质是林地景观,林地所占面积和周长最大,斑块规模都较大,基本连接成片,保持得较为完整;其次为草地、旱地;3者构成景观主要类型;②园地和城乡居民用地散布于整个景观中,其破碎化程度较高,人类活动对其影响程度较大;③草地的分形维数最大,其边界褶皱程度较高,但从整个景观来看,边界褶皱程度较小;④林地的结合度最高,连接性好,景观破碎化程度低。城乡居民用地和园地的结合度较低,连接性较差,景观破碎化程度高,但整体上看,景观连接性好,景观破碎化程度低。结论黄龙县景观局部破损,但整体较好。

Aim Revealing the landscape some references and suggestions for making pattern and landscape fragmentation of Huanglong County, it can give a strategic decision on land utilization in the future. Methods Based on the land-use map data of Huanglong County, the geographic information system and software of landscape pattern （Fragstats3.3） and a number of landscape pattern indices are used to analyze the spatial pattern of Huanglong County and the degree of fragmentation. Results The conclusions are as follows： 1 ） Matrix in the land-use landscape of Huanglong County is woodland landscape. Its patches are large-scale and most of them are conjunctive. Woodland is the most important landscape type with the largest area and perimeter in this region and has the highest integrity, followed by grassland and dryland. The three types consists of the main landscape types. 2） The urban and rural purpose land and orchard land show greater fragmentation and are deeply influenced by human being in the area. 3 ） The highest fractal dimension of the grassland shows a low degree of perimeter complexity in the landscape. 4） The cohesion index of the woodland is the highest, and that of the urban and rural land-use is the lowest. All of the results show that the orchard and settlement are highly fragmentized, and woodland has the highest integrity. As a whole, the landscape lightly fragmentizes and connects with each other well. Conclusion The landscape pattern and fragmentation of Huanglong County is partially destroyed, but it is good in a whole