关键词: 大山雀, 破碎化, 斑块面积, 隔离度, 繁殖成功

Abstract: Shrubs are widely distributed in "Three Norths" of China, being the important component of shelter-forest systems. Based on the investigations and analyses of distribution, growing status, biomass, main nutrient in leaves and calorific value of 10 or so species of shrubs in Wulanaodu experimental area (which locates in the western end of Keerxing desert), quantitative evaluations of the efficiencies of shrubs for shelter, forage, fuel and weave are made in this paper.

Key words: Great Tit, Fragment, Forest patch size, Isolation, Reproductive success