摘要
通过构建桫椤种群生态场模型,对福建瓜溪桫椤自然保护区内不同地段的桫椤种群生态场特性进行了分析和讨论.研究结果显示,在个体数量差异不大的情况下,种群生态场作用的强弱与种群内植株个体的大小具有明显的相关关系.地段Q3、Q4、Q5、Q6的桫椤种群以大、中型植株为主,个体生态场作用大,彼此间叠加强烈,形成的种群等势线较多,具有明显的梯度,呈现疏密不均变化;三维空间势曲面总体水平高,闭合范围大,种群内场作用强烈,作用空间大.地段Q1、Q2、Q7、Q8的桫椤种群以小型植株或幼苗、幼株为主,种群场内以个体场为主,或有微弱的叠加场,种群场等势线少,没有形成梯度;三维势曲面总体水平低,或呈现独立的个体场势面,不发生场叠加,种群内场作用弱,场波及范围小.
Ecological field characteristics of Alsophila spinulosa populations in different sites of the Guaxi Alsophila spinulosa Nature Reserve in Fujian, China were analyzed and discussed through constructing ecological field model. The results indicated that the ecological field effects were significantly correlative with individual sizes in the populations. In the populations of sites Q3, Q4, Q5 and Q6 predominated by large or middle-sized individuals, ecological field effects of individuals were great and superimposed intensively each other. Thus, the ecological equipotential lines of these populations were abundant and showed inhomogeneous variation in density with apparent gradients. These populations also had high three-dimension spatial curved surfaces and wide closed scopes of ecological potentials, reflecting the strong field effects and the large effect spaces. However, with respect to the populations of sites Q1, Q2, Q7 and Q8 mainly consisting of seedlings and young individuals, the majority of the individual ecological fields were small and they did not or weakly superimposed each other. As a result, the equipotential lines of these populations did not form pronounced gradients. And the three-dimension curved surfaces of the ecological potentials were low overall and there existed many potential surfaces of individual fields in the population without superimposition. These suggested that the field effects of the populations of sites Q1, Q2, Q7 and Q8 were weak and the influence extents were small. Fig 2, Tab 1, Ref 18
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2008年第4期475-480,共6页
Chinese Journal of Applied and Environmental Biology
基金
福建农林大学青年教师基金资助项目(05B04)
福建省自然科学基金资助项目(B0110026)~~
关键词
濒危植物
桫椤
种群
生态场
生态势
endangered plant
Alsophila spinulosa
population
ecological field
ecological potential
