摘要
为了解以采集种实为主的人为干扰对闽楠种群结构和数量的动态影响,分析闽楠种群的干扰历史,以广西壮族自治区富川瑶族自治县的闽楠天然林为研究对象,分析种群龄级和高度级结构,编制静态生命表,绘制存活曲线,采用生存分析理论与数量化分析法研究种群结构与动态,并运用时间序列模型对种群数量动态进行预测。结果表明:采集干扰对闽楠种群结构影响较大,采集干扰导致更新层个体减少,但种群的生存率提高,低龄级个体向高龄级补充的成功率提高;在无采集干扰的蚌贝村村委(BB)的闽楠种群中,幼苗死亡率更高,乔木层个体结构呈衰退趋势。采集干扰对闽楠种群动态趋势无明显影响,两个种群都是增长型,但采集干扰提高了种群的存活率。BB的闽楠种群存活曲线为Deevey-Ⅲ型;采集干扰的白面寨(BMZ)闽楠种群则更倾向于Deevey-Ⅱ型。采集干扰可以提高闽楠种群稳定性和抗干扰能力,在未来3、6、9个龄级后,种群个体数有所增加,种群呈增长趋势;人为干扰可以缩短种群发展到合理结构所需的时间,幼苗、幼树高死亡率是影响闽楠种群结构和天然更新的关键因素,人为干扰是促使闽楠成为群落优势种的原因之一。
The dynamic effects of human disturbances on Phoebe bournei were studied in the forests of Fuchuan County,Guangxi,China.The aim was to gather data on seed collection,population structure,and quantity dynamics,and to analyze the disturbance history of the P.bournei population.Field surveys were used to create age and height class structure diagrams,a static life table,and survival curves.Population survival status was determined from the amount and survival analyses,and the population dynamics were predicted by a time sequence model.The results showed that collection disturbance had a large influence on the population structure of P.bournei.Collection disturbance reduced the number of individuals in the upper layer.However,the population survival rate increased,and the younger(supplemented)individuals that survived to advanced age improved.In the undisturbed population,the seedling mortality rate was higher,and the population structure of the tree layer trended downwards.Collection disturbance did not influence the dynamics of the P.bournei population.Both populations grew,but collection disturbance increased the population survival rate.The survival curve of the BB population(undisturbed)trended towards Deevey-Ⅲtype,and the BMZ population(disturbed)trended towards Deevey-Ⅱtype.Collection disturbance improved the stability and anti-interference.Time series predictive analysis showed that the number of individuals increased in the 3,6,and 9 age classes and that the number of individuals and the overall population trended upwards.Human disturbance shortened the time required for the P.bournei population to develop into a mature structure and may explain why it became a dominant species in the community.High seedling and sapling mortality were also key factors that affected the population structure and natural regeneration of P.bournei.
作者
林建勇
李娟
李俊福
唐复呈
于永辉
梁瑞龙
LIN Jianyong;LI Juan;LI Junfu;TANG Fucheng;YU Yonghui;LIANG Ruilong(Forest Management Institute,Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning,Guangxi 530002,China;Key Laboratory of Central South Fast-growing Timber Cultivation of Forestry Ministry of China,Nanning,Guangxi 530002,China;Natural Resources Bureau of Fuchuan Yao Autonomous County,Fuchuan,Guangxi 542700,China;Guangxi Gaofeng Forest Farm,Nanning,Guangxi 530001,China)
出处
《森林与环境学报》
CSCD
北大核心
2020年第4期377-385,共9页
Journal of Forest and Environment
基金
广西科技计划项目(桂科AB17292066,桂科AB16380092)
广西自然科学基金项目(2016GXNSFBA380032)。
关键词
闽楠
种群结构
种群动态
静态生命表
生存分析
采集干扰
Phoebe bournei
population structure
population dynamics
static life table
survival analysis
collection disturbance
