关键词: 景观格局变化, CA-Markov模型, 土地利用, 挠力河流域

Abstract: With the aid of the CA-Markov model,impacts of land use on the wetland landscape pattern of the Naoli River Watershed was analyzed.Results show(1) the wetland landscape pattern varied significantly,with the largest patch index(LPI) of wetland landscape,and the perimeter-area fractal dimensions(PA-FRAC) of cultivated land and water body declining gradually,while the interspersion & juxtaposition index(IJI) of marsh and residential land,the aggregation index(AI) of wet meadow and cultivated land,and the fragmentation degree of cultivated land landscape increased ascending gradually,leading to shrinkage of the wetland landscape from lands of high relief in the circumference of the basin to the narrow corridor alongside the central river from 1967 to 2000;(2) variation of the land use was significant,reflected in rapid expansion of farmland and residential land,and mergence of farmlands in distribution;and dominance of the landscape shifted from by wetland to by farmland;and(3) variation of the intensity of land use between time phrases were remarkable.Disturbance of the wetland landscape by human activities increased in intensity in the period from 1967 to 2000,leading to rise of the proportion of artificial landscape in area from 26.5% to 67.8%,and of the intensity of land use impact from 1.690 to 2.394.The simulated impact intensity of land use on the basin was lower than the actual data in 2000.It is,hence,concluded that the disturbance intensity in the period of 1983-2000 was higher than in the period of 1967-1983.Based on variation of the areas of residential land and the wetland,temporal differences in contribution of population expansion and drainage activity to the impact of land use on the wetland landscape pattern can be distinguished in the Naoli River Watershed.

Key words: landscape spatial pattern, CA-Markov model, land use, Naoli River Watershed