九龙山珍稀濒危植物南方铁杉种群数量动态.docVIP

 植物生态学报 2008, 32 (5) 1146~1156 Journal of Plant Ecology (Chinese Version) 九龙山珍稀濒危植物南方铁杉种群数量动态 张志祥1 鹏1* 蔡妙珍1 康华靖1 廖承川2 刘春生1 楼中华1 刘 (1 浙江师范大学化学与生命科学学院,浙江金华 321004) (2 九龙山国家级自然保护区管理局,浙江遂昌 323300) 摘 要 针对九龙山国家级自然保护区南方铁杉(Tsuga tchekiangensis)种群的分布特点, 设置了10个具有代表性 的样地。以种群生命表及生存分析理论为基础, 编制了南方铁杉种群的静态生命表, 绘制了存活曲线、死亡率曲 线、消失率曲线、生存率曲线、累计死亡率曲线、种群死亡密度曲线和危险率曲线, 分析了种群数量特征; 同时 结合谱分析方法, 分析了南方铁杉种群数量的动态变化。结果表明: 1) 南方铁杉种群结构存在波动性, 幼年阶段 的个体较丰富, 成年个体数量相对较少, 种群趋于Deevey Ⅱ型。2) 南方铁杉种群死亡率和消失率曲线变化趋势 基本一致, 均出现两个高峰, 一个出现在第5龄级阶段, 另一个出现在第15龄级阶段。3) 南方铁杉种群的生存率单 调下降, 累计死亡率单调上升, 生存率下降趋势前期高于后期, 累计死亡率则相反。4) 4个生存函数曲线表明, 南 方铁杉具有前期稳定、中期锐减和后期衰退的特点。5) 种群动态的谱分析显示, 南方铁杉种群动态除受基波影响 外, 还存在着明显的小周期波动, 谐波A3处周期的波动与南方铁杉的高生长有关; A6处周期的波动与外界环境变 化有关; A8处周期的波动与南方铁杉进入生理衰退期有关。 关键词 种群生命表 存活曲线 生存分析 谱分析 种群数量动态 南方铁杉 POPULATION QUANTITATIVE CHARACTERISTICS AND RARE AND ENDANGERED TSUGA TCHEKIANGENSIS IN NATURE RESERVE OF CHINA DYNAMICS OF JIULONGSHAN ZHANG Zhi-Xiang1, LIU Peng1*, CAI Miao-Zhen1, KANG Hua-Jing1, LIAO Cheng-Chuan2, LIU Chun-Sheng1, and LOU Zhong-Hua1 1College of Chemistry and Life Science, Zhejiang Normal University, Jinhua, Zhejiang 321004, China, and 2Administration Bureau of Jiulong- shan Nature Reserve, Suichang, Zhejiang 323300, China Abstract Aims Our objective was to investigate population quantitative characteristics and dynam- ics of Tsuga tchekiangensis, which is listed as a Chinese national third protective plant with a small geographic distribution in subtropical forests of Jiulongshan Nature Reserve, Zhejiang Province, China. Methods Ten plots (20 m × 20 m) were investigated along different ridges from low to high altitude. We developed a static life table of T. tchekiangensis population based on the population life table and theory of survival analysis. Survivorship curves, mortality rate, killing power, survival rate, cumulative mortality rate, mortality density and hazard rate were determined, and population dynamics were ana- lyzed usin