三种百合科植物meta种群的研究

Most if not all species live in patchy habitats. This has become increasingly true because of landscape fragmentation throughout the world. The set of local (patch) populations of a species in spatially discrete habitats may be called a metapopulation.At present, there have been extensive studies on the animal metapopulation. However, studies on the plant metapopulation are rare. In addition, studies on metapopulation in our country mostly focused on translating external papers and introducing the situation of their researches, and nearly there isn't material study on metapopulation.we study the metapopulation of Lilium tsingtauense. Based on long-term site studies and all-around investigation, we ascertained six subpopulations of Lilium tsingtauense at different altitude, applied GPS, GIS to make certain the orientation of individuals and mensurated their heights in each subpopulation, and estimated the age class of Lilium tsingtauense. At same time some environment factors have been test with which the species growth and development have relationship.Lilium tsingtauense, which mainly distributes in Mountain Lao, is an endemic, rare and endangered plant in China. Because of the disturbance of human, the habitats of Lilium tsingtauense have been fragmental. The species can only be found at altitude 400~1000m in the beauty spot of Bei Jiu Shui of Mountain Lao, and lives in patchy habitats. The habitat is located at the shade slope or semi-shade slope where the forest coverage was developed well and the sunlight and soil humidity can meet the needs of the species. The population of Lilium tsingtauense takes on the form of metapopulation. There are 6 patch in our study transect named population 1, population 2, population 3, population 4, population 5 and population 6. .After the studies about the height and leaves number structure by use statistic methods we know that the distribution curves of height is not fit the normal distribution while the leaves number distribution is. At the same time, the age structure, time-specific life table, survivorship curve, fecundity schedule and Leslie matrix were obtained through analysing the demography and age structures of each subpopulation. The results showed that the survivorship curve of subpopulation at altitude 490m pertained to "Ⅱ" shape, while others were "Ⅰ" shape. And through Leslie matrix analysis, we deduced, except of the subpopulation at altitude 490m, the subpopulations of Lilium tsingtauense will not die out if not been disturbed badly..We estimated the growth ability and resistance ability of both metapopulation and local population by use the method of quantitative analysis for population structural dynamics. The growth ability order is population 1> population 2> population 3> population 5> population 6 >metapopulation >population 4. Under the condition of random the persistence ability order is population1< population 3< population 5<population 2 < population 6 <metapopulation<population 4 while under non-random disturbance is population 5< metapopulation < population 3<population 6 < population 1 <population 4 <population 2 . Based on these, we analyzed the reasons and put forward preserving advice. We educed the principal factors that led the young seedling of Lilium tsingtauense population to die were imputed to the serious drought during 1~2years old, and the deficiency of solar light in the communities , as well as in weaker intrinsic resistance to unfavorable environmental conditions. Under proper conservation, the metapopulation of Lilium tsingtauense will not disappear in short term. We studied its distribution pattern by using the following measures: the test for fitting to the Poisson, negative binomial and Neyman A distribution. At the same time, we use negative binomial parameter, dispersal index, patchiness index, Cassie s index and clumping index, estimated the aggregation intensity. The results showed that the distribution pattern is typically aggregated, and the intensity of aggregation varied in different subpopulation.

选择3种百合科具有重要意义的植物，进行meta种群动态和种群存活力的分析，以此为范例⒅参飉eta种群研究的指标体系和技术体系。应用现代建模理论、计算机技术和地理信息低辰eta种群动态模型，提出确定最小存活种群大小的原则与方法，为保护生物学理论钩浜吞峁┲参飉eta种群的内容和证据。