关键词: 景观结构, 斑块密度, 基质, 廊道, 有性繁殖, 天然种群, 毛红椿, 适合度系数, 更新, 个体繁殖适合度

Abstract: Based on the TM5 satellite images and other relevant maps, e.g., the landform, soil and vegetation maps by GIS (PC ARC/INFO3.4D), the landscape of Yellow River delta was classified into 8 types and 30 subtypes. Accordingly, with the ratio of patch perimeter to area as well as the relative area and the spatial relations of landscape types as the indexes of identifying matrix, the landscape of Tamarix chinensis-Phragmites communis saline fluvo aquic soil inclined flat was discriminated as matrix in the landscapes of Yellow River delta. The corridors were discriminated by statistics of the ratio of patch perimeter to area step by step. The analyses on landscape fragmentation at Yellow River delta by patch density show that the patch density was bigger in ecotones, and the landscape fragmentation nearby old river courses was serious.

Key words: Landscape structure, Patch density, Matrix, Corridor, individual reproductive fitness, fitness coefficient, natural population, sexual reproduction, regeneration., Toona ciliata var. pubescens