摘要
陕西旬邑县子午岭的北桑寄生(Loranthus tanakae)寄生于子午岭优势种和建群种辽东栎(Quercus liaotungensis)上。该文通过调查子午岭北桑寄生的年龄结构,编制了北桑寄生的静态生命表,绘制了存活曲线、死亡率曲线、消失率曲线和生存函数曲线,分析了种群的动态变化。结果表明:子午岭北桑寄生种群存活曲线属于Deevey II型,有较为稳定的死亡率,消失率曲线和死亡率曲线变化趋势基本一致,均有两个高峰,一个出现在5龄,另一个出现在10龄,危险率曲线在6龄出现一个波动,生存率曲线和累计死亡率曲线分别呈下降趋势和上升趋势,均表现为前期高于后期,北桑寄生在8龄后进入衰老期。由生存函数曲线年龄阶段看出,子午岭北桑寄生种群具有前期、中期稳定,后期衰退的特点。
Aims Loranthus tanakae is a parasitic plant found on Quercus liaotungensis, which is a dominant and constructive tree species in forests of Mount Ziwuling. Our objective was to determine the ecological characteristics of L. tanakae in this region. Methods In the paper, based on investigations on the age structure of a L. tanakae population, a static life table was constructed, curves of survival, mortality, disappearance rate, and survival function were established, and the dynamics of the L. tanakae population were analyzed. Important findings The survival curve of the L. tanakae population studied is characterized as the type Deevey II, with relatively stable mortality. The pattern of the disappearance rate curve is similar to that of the morality curve; they both have two peaks： one occurring at the 5th age and the other at the 10 th age. A fluctuation occurred in the risk rate curve at the 6th age. The survival curve showed a declining trend while the cumulative morality rate curve displayed an uptrend, and the L. tanakae reached the senescence after the 8th age. According to the age composition of the survival curve, the L. tanakae population studied remained stable in the early and middle stages, but declined in the late stage.
出处
《植物生态学报》
CAS
CSCD
北大核心
2014年第7期687-693,共7页
Chinese Journal of Plant Ecology
基金
国家自然科学基金(31100311)
中央高校基本科研业务费专项资金(GK201302023)
关键词
生命表
北桑寄生
种群数量
生存分析
存活曲线
life table
Loranthus tanakae
population quantity
survival analysis
survival curve
