雅鲁藏布江上中游地区不同农牧活动强度下的景观格局分异

Variations on landscape pattern under different intensity activities for cropping and pasturing in the upper and middle reaches of Yarlung Zangbo River

本文分别以雅鲁藏布江上中游三个不同农牧活动强度区——低强度区仲巴、中强度区昂仁和高强度区日喀则三县/市为例,分析了该三个研究片区的不同农牧活动干扰强度下的景观格局变异。结果表明:自上游的仲巴至中游的日喀则,随着人类农牧活动强度的加大,景观格局亦随之呈现规律性的变异,自然景观和半自然景观面积百分比逐渐下降,而包括耕地及居民地在内的人工景观面积比例上升明显;上游的仲巴片区景观形状简单、粒径粗大、分离度小、景观多样性低,而至中游地区的日喀则片区,则表现为景观形状复杂、粒径小、分离度大、景观多样性丰富。

Taking Zhongba county ,Angren county, Rikase city located at the upper and middle reaches of Yarlung Zangbo River as landscape units, this paper studied the variations on landscape pattern under different intensity activities for cropping and pasturing in the three areas. The results showed that：down from Zhongha at the upper reaches to Rikaze at the middle ones,regular variations occur on the landscape pattern with human disturbance intensity on cropping and pasturing increasing. The area percentage for natural and semi - natural landscape decreases while the one for artificial landscape including cultivated land and construction land increases significantly. In Zhongba,the landscape structure appeared to be simpler with coarse grains and a less rich diversity. While in Rikaze,the landscape showed a complicated shape with finer grains and a relatively richer diversity.