关键词: 带鱼, 小型鱼类, 空间异质性, 变异函数

Abstract: By using multiple data resources and 3S techniques, this paper analyzed the landscape patterns of Minjiang River upper reach in 1986, 1995 and 2000, with the focus on the responses of main landscape types to the anthropogenic activities. The results showed that in the study area, grassland and forestland were the main landscape types, occupying 96.1%, 96.38% and 95.23% of the total in 1986, 1995 and 2000, respectively, and other landscape types were scattered in them. These two landscape types controlled the landscape pattern change and ecological processes of the whole study area. Different landscape types had great differences in their responses to anthropogenic activities intensity (AHI). Low AHI was beneficial to the landscape restoration of forestland; high coverage grassland was sensitive to all grades AHI except grade 1, and only strictly decreasing AHI could maintain its landscape; while medium coverage grassland was sensitive to lower and medium AHI, with the landscape degraded and the area decreased. High intensity management activities could change the landscape patterns to a desirable direction.

Key words: Hairtail, Small-scale fish, Spatial heterogeneity, Semivariogram