摘要
【目的】南方红豆杉古树在中国南方地区多呈零星分布状,较难形成具有一定个体数量的种群;对其古树的种群结构及动态进行分析,可为古树种群的恢复及古树后备资源培育提供科学依据。【方法】以福建连城县2个南方红豆杉古树种群为对象,通过绘制种群径级结构和存活曲线,编制静态生命表,计算种群动态变化指数,进行了种群结构和动态分析。【结果】(1)两个古树种群的Ⅰ径级个体数据均较少,赖源乡郭地村种群为衰退型种群,曲溪乡白石村为弱增长型种群。(2)静态生命表显示,两个种群达到中等径级后,种群的活力和生命期望值均开始下降。(3)赖源乡郭地村种群存活曲线为Deevey-Ⅱ型的b1变型,曲溪乡白石村的为Deevey-Ⅲ型。(4)两地种群在无干扰和有干扰下的数量变化动态指数分别为-3.03和7.5、-0.34和0.75,这与种群结构特征相吻合。【结论】减少人为干扰、提升种子萌发率及增加小径级的个体数是促进该区域南方红豆杉种群恢复的关键。
【Objective】The old trees of Taxus wallichiana var. mairei are mostly scattered in southern China,and it is difficult to form populations with a certain number of individuals. The analysis of the population structure and dynamics of the old trees can provide a scientific basis for the restoration and the cultivation of old tree resources. 【Method】In this study,the population structure and dynamics of two old trees populations of T. wallichiana var. mairei in Liancheng County of Fujian Province were analyzed by drawing a diagram of the diameter class structure and survival curves,compiling static life tables,and calculating population dynamic change indices.【Result】(1)The individuals of Ⅰ-diameter class of both old tree populations were small. The population in Guodi Village,Laiyuan was a declining population,while the other is a weak growth population in Baishi Village,Quxi.(2)Static life tables showed that the viability and life expectancy of two populations began to decline after reaching the intermediate diameter class.(3) The population survival curve of Guodi Village in Laiyuan was the b1 variant of Deevey-Ⅱ,and that of Baishi Village in Quxi was Deevey-Ⅲ.(4) The dynamic indices of population in the absence and presence of disturbance at two sites were-3.03 and 7.5,-0.34 and 0.75,respectively. This was consistent with the characteristics of population structure. 【Conclusion】Reducing anthropogenic disturbance,enhancing seed germination rate and increasing the individual numbers of small diameter classes are the keys to promote the recovery of old tree populations of T. wallichiana var. mairei in this region.
作者
谢春平
沈顺霆
刘大伟
俞筱押
黄绍虎
XIE Chunping;SHEN Shunting;LIU Dawei;YU Xiaoya;HUANG Shaohu(College of Science,Qiongtai Normal University,Haikou 571127,China;Nanjing Forest Police College/Key Laboratory of State Forest and Grassland Administration on Wild Life Evidence Technology,Nanjing 210023,China;School of Tourism,and Resource Environment,Qiannan Normal University for Nationalities,Duyun 558000,Guizhou,China;Forestry Science Institute of Nanchong,Nanchong 637099,Sichuan,China)
出处
《四川农业大学学报》
CSCD
北大核心
2022年第3期379-386,共8页
Journal of Sichuan Agricultural University
基金
国家林业和草原局生物安全与遗传资源项目(KJZXSA202031)
琼台师范学院人才引进项目(2022)
琼台师范学院热带生物多样性与资源利用实验室(QTPT21-5)。
关键词
种群结构
静态生命表
存活曲线
南方红豆杉
population structure
static life table
survival curve
Taxus wallichiana var.mairei
