摘要
采用聚集度指标和编制静态生命表的方法,对伏牛山区红豆杉种群的空间格局及其演化动态进行了研究,结果显示:(1)伏牛山区红豆杉种群的空间分布格局总体上呈现聚集分布状态,聚集程度从幼苗阶段到老龄阶段的发育过程中,呈现先降后升的U型变化趋势;(2)不同龄级的红豆杉树存活量差别较大,种群存活曲线属于Deevey-Ⅲ型;(3)幼苗期和幼树期的红豆杉死亡率高,Ⅲ级(3m高)以后死亡率明显下降,种群数量趋于稳定。本研究表明,伏牛山自然保护区天然红豆杉种群呈现明显的衰退趋势,严酷的环境筛致使红豆杉幼苗死亡率高可能是该种群衰退的主要原因,但树木资源缺乏保护而被滥伐或盗伐、生境被破坏等影响也不容忽视。施行严格的封育政策并辅以人工繁育措施,是保护和恢复该宝贵资源的当务之急。
Based on the aggregation indices and time-specific life table,the structure and dynamics of natural Taxus chinensis population were studied.The results showed that：（1）the natural Taxus chinensis resources distributed sporadically,but they relatively concentrated in the distribution area,and the aggregation class decreased first and then seemed to follow the U-shaped curve in the process of seedling to old trees;（2）the differences of survival amount were significant among the age classes,the survival curve followed the Deevey-Ⅲ type;（3）the mortality was higher at the stage of seedling and sapling,but it declined significantly afterⅢlevel（3m）.These results indicated that the trends of natural Taxus chinensis population were a recession in Funiushan Mountain,high mortality of seedlings caused by harsh environmental sieve might be the main reason for the decline of population,meanwhile lack of resources protection induced the illegal felling trees,habitat destruction and so on also could not be ignored.So it is urgent to take measures to protect and restore the precious resources and to take the strict closure policy and auxiliary measures of artificial breeding.
出处
《水土保持研究》
CSCD
北大核心
2016年第3期262-268,共7页
Research of Soil and Water Conservation
基金
河南省科技攻关计划项目"中国中部伏牛山特有红豆杉生态适应性与繁育关键技术研究"(122102310652)
河南省环境科学重点学科(Pxy-zdxk-2013003)
平顶山学院高层次人才科研启动经费(2012005)
关键词
濒危植物
生命表
种群结构
红豆杉
时间序列分析
endangered plant
life table
population structure
Taxus chinensis
time series analysis
