黄龙山蔡家川林场景观格局分析及其破碎化评价

Analysis on Landscape Pattern of Forest Farm in Caijiachuan of Huanglongshan

基于1997年黄龙山蔡家川林场1∶50 000林相图和卫星航片的解译,利用景观分析软件Fragstats3.3,从景观总体特征、斑块面积、斑块数、斑块周长、分形维数和邻近度指数等方面对该区景观格局和破碎化程度进行分析和评价。结果表明,该区林地面积最大、最完整,其他景观类型多呈小面积零散分布;苗圃、采伐迹地、未成林地和预备造林地景观组分在景观中的周长比例及斑块边界周长较小,破碎化程度较高;各景观组分的分形维数均较低(接近于1),说明各景观组分斑块边界的褶皱程度较低,整个景观的边界形状较简单;林地的邻近度指数最大,破碎化程度最低,对整个生态系统稳定性的贡献最大。

Based on 1：50 000 stock map of forest farm in Caijiachuan of Huanglongshan and the interpretation of satellite aerial photo in 1997, the landscape pattem and its degree of fragmentation in this area were analyzed with landscape analysis software Frngstats 3.3 from overall characteristics, patch area,patch number,patch perimeter, fractal dimension and adjacent degree index of the landscape. The results showed that the forest land was the most complete with the largest area, other types of landscape mostly showed scattered distribution with small area. The perimeter ratio of nursery, cutting - blank, afforestation land and suitable forest land in the wbole＇landscape and their boundary perimeter of patch were smaller, and their degree of frag- mentation were higher. The fractal dimension of all landscape elements were low （close to 1） ,which indicated that the fold degrees of patch boundary of all landscape elements were lower ,and the boundary shape of the whole landscape was simple. The adjacent degree index of forest land was the biggest, and its degree of fragmentation was the lowest, so its contribution to-the stability of the whole ecosystem was the biggest.