摘要
秃山白树是中国特有单种属植物山白树的变种,为国家二级保护植物,仅分布于山西历山自然保护区。为更好地了解其种群数量动态,保护该种群持续稳定发展,在历山自然保护区,采用样地与样方调查相结合的方法,调查了秃山白树的种群结构,编制了秃山白树静态生命表,绘制了其年龄结构图、存活曲线、死亡曲线、消失率曲线、生存函数曲线、累积死亡率函数曲线、危险率函数曲线和死亡密度函数曲线。结果表明:秃山白树种群幼龄级个体数量较多,老龄个体数量较少,表明现阶段秃山白树整体为增长型种群;种群死亡率生长前期高于后期,在Ⅱ和Ⅳ龄级的年龄阶段出现死亡率高峰,种群存活曲线趋于De-evey-Ⅱ型;生存率曲线单调下降,累积死亡率曲线单调上升,其下降或增加的幅度是前期高于后期;种群死亡密度函数曲线较为平缓,在Ⅲ龄级死亡密度较大;危险率函数随着龄级的增加不断增大。
Sinowilsonia henryi var. glabrescens is a variety of S. henryt, a Lhlnese endemic and monotypic species, and one of the national secondclass protective plants in China, only distribu ting in the Lishan Mountain Nature Reserve in Shanxi. To better understand the quantitative dy namics of S. henryi vat. glabrescens population and to facilitate its sustainable and steady devel opment, the methods of plot survey and quadrat investigation were adopted to study the popula tion structure of S. henryi vat. glabrescens in the Reserve. The static life table of the population was compiled, and its age structure, survival curve, mortality curve, disappearance rate curve, survival function curve, cumulative morality function curve, hazard rate function curve, and death density function curve were drawn. In this population, young and infant plants were in lar ger quantity, while aged ones were fewer, indicating that this population was overall a growing population. Its morality was higher at early stage than at late stage, and peaked between the Ⅱ and Ⅳ age stages. The survival curve was more of Deevey-Ⅱ type, and the survival function curve decreased monotonically while the cumulative morality function curve was in monotonic in crease, the decreasing or increasing range being higher at early stage that at late stage. The death density function curve was relatively stable, with a higher rate during the m age class. The haz ard rate function curve was increasing with the growth of age class.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第1期52-58,共7页
Chinese Journal of Ecology
基金
山西省出国留学基金项目(20081073)资助
关键词
年龄结构
秃山白树
存活曲线
age structure
Sinowilsonia henryi vat. glabrescens
survival curve.
