毛乌素沙地中国沙棘种群数量动态研究

编号 zgly0000329427

文献类型 期刊论文

文献题名 毛乌素沙地中国沙棘种群数量动态研究

学科分类 220.1060;森林生态学

作者 李根前  赵粉侠  李秀寨  韦宇 

作者单位 西北农林科技大学 

母体文献 林业科学 

年卷期 2004,40(1)

页码 180-184

年份 2004 

分类号 S718.54 

关键词 毛乌素沙地  中国沙棘  种群数量  动态分析 

文摘内容 Based on the measurement of all individuals of population at different successional stage and following excavation of clones, the density and biomass dynamics of Hippophae rhamnoides L. subsp, sinensis population in Mu Us sandland were analyzed with the methods of plots arranged with age and reverse age class addition(RAA). The main results were as follows:(1)The density of clone population increased with the population growth before 5-year-old. The population biomass accumulating also increased by Logistic equation in the period of age structure of population developed from increasing type to mid-decreasing type.Then they tended to be decrease. While the population density, population biomass augmented again with the emergence of gap regeneration, and the dominant status of H.rhamnoides L.subsp, sinensis population and the stability of the community were maintained. (2)The decrease process of density of daughter ramets population lagged behind that of mother ramets population,and the numerical ratio of daughter ramets population within the population gradually enlarged. As the population thinned, the composition of population changed from more clones with less daughter ramets to less clones with more daughter ramets and the genetic diversity of population reduced. (3)The prosperous stage of biomass accumulation appeared from 8-year-old to 16-year-old and its peak appeared at 12-year-old. And the relationship between the individual mean weight and population density could be expressed by the law of power-3/2 in the period of age structure of population developed from stable type to decreasing type。