黄连木种群性比格局研究

Study on Population Sex Ratio of Pistacia chinensis

在100 m×140 m固定样地中检验黄连木种群性比与繁殖植株密度、种群密度和林分密度的关系,分析微生境因子对黄连木种群性比的影响。结果表明:黄连木雌、雄植株数随取样面积的增加而增大,且种群性比显著偏雄性(检验,p<0.05);黄连木种群性比表现出显著的密度依赖性(p<0.001),雄株比例与繁殖植株密度、种群密度、林分密度均呈显著正相关;在10 m×10 m研究尺度上,雌树和雄树株数均与土壤全氮、有机碳、有机质以及枯落物厚度呈显著正相关,表明黄连木种群雌雄植株具有相似的资源需求;黄连木雄树株数与土壤湿度呈显著正相关,土壤全磷含量对黄连木种群性比具有显著负向影响,而土壤湿度则对种群性比表现出显著正向影响。

The relationship of population sex ratio with population density and stand density was tested in the dioecious tree species Pistacia chinensis within a 100 m×140 m permanent sample plot for studying effect of microenvironment factors on sex ratio.The results showed that number of male and female trees increased with the increase of sample areas.The sex ratio was significant male-biased（chi-square test,p0.05）.The population sex ratio exhibited significant density-dependence（p0.001）.Male tree proportion had evident positive relation with population and stand density.Within the plot,there was a significant positive correlation between number of male and female tree and total N,organic carbon,organic matter and litter depth.The result proved that it had similar demands for resource of both sexes of P.chinensis.The number of male P.chinensis significantly increased with soil moisture.Total P content in the stand showed significant negative effect on sex ratio,while soil moisture showed significant positive effect on sex ratio.