甘肃荒漠蜥蜴群落结构的研究

甘肃民勤地区荒漠晰蝎群落多样性与植物种数、植物多样性呈不显著负相关,与植物高度呈不显著正相关(P>0.1),与土壤含水量和pH值几乎无关。而与植物密度,植被覆盖度,食物种数、密度和多样性显著负相关(P<0.05)。植物密度、植被覆盖度和食物是荒漠晰蝎群落结构的主导因子。主导因子通过对群落中优势种种群密度的调节控制群落结构。

COMMUNITY STRUCTURE OF DESERT LIZARD IN GANSU PROVINCE

This study was conducted in desert area of Minqin in Northern Gansu from 1 May to 12 June in 1989. Eleven lizard communities were investigated in order to reveal the interrelationships between community structure of desert lizaed and environmental spatial heterogeneity and to find out the determinants of community structure. This study also deals with the mechanism regulating and controlling community structure by determinants at population level.Four species of lizards were found, and the number of species in the communities ranged from 2 to 4. The community diversity of lizard was insignificantly negatively interrelated with the number of plant species and diversity of plant species(r= -0.3711, p>0.1 and r =-0.1925, p>0.1). Very little or no interrelationship occurred between community diversity of lizards and moisture contents and pH of soil (r = 0.0248 and r = 0.0196). Whereas the community diversity of lizards was negatively interrelated to coverage of vegetation and density of plants fairly significantly(r=-0.5537, p<0.05; r=-0.5511, p<0.05) and to the number of species, density and diversity of potential food resources significantly (r=-0.7260, p<0.01; r=-0.7407, p<0.01; r=-0.6411, p<0.01). The vegetation and food resources were the determinants of community structure. The determinants regulate the community structure by controlling the density of populations that compose the communities.