Study On Quantitative Ecology Of Elaeagnus Umbellata Thunb In Shanxi

This research use Elaeagnus umbellata Thunb as material, and use methods of quantitative ecology on the basis of field investigation, research on Elaeagnus umbellata Thunb population of ShanXi(Ivliang mountain、taihang mountain、zhongtiao mountain), and provide scientific basis for protecting Elaeagnus umbellata Thunb population. The research mainly explored Elaeagnus umbellata Thunb from the aspects of the population characteristics、classification and ordination、species diversity、 niche、species association. Result indicate that:(1) The geographical distribution of Elaeagnus umbellata Thunb is clustering distribution, and it mainly spread in the region that elevation is850m-1800m; and scope is to the south of Taiyuan.(2) There are158species in the community of Elaeagnus umbellata Thunb, belonging to49families and119. The composite family、Leguminosae、Rosaceae、the grass family are the bigger families; Artemisia、Lespedeza, Viola, Spiraea, Thalictrum, Lonicera, Acer are the bigger genera.(3) We divide Elaeagnus umbellata Thunb community into10category by using TWINSPAN, the first axle of DCA reflect the change of water in the environment, the second axle reflect the change of temperature, the diagonal line reflect altitudinal gradient. The DCA sequencing of dominant species is the same as that of quadrat, most of dominant species are cold-resistant、 drought-enduring, and locate above the axle.(4) index of species diversity, dominance index, evenness index, and we analyse the difference of every species from the aspects of coenotype and structure of community, result indicate that: there is consistent change among richness index, index of species diversity, dominance index, evenness index. The main factors were environmental factors has as slope direction, slope, Soil type. And communities strueture as well as communities species composition and disturb aneeofhumanactivities.(5) Use Levins niche breadth index、the Hurlbert index width and the Pianka niche breadth index overlap of Shanxi Elaeagnus umbellata Thunb community37niche were determined,the result showed that:Elaeagnus umbellata, Hippophae rhamnoides Linn., Rosa xanthina Lindl. and Vitex negundo Linn. var. heterophylla (Franch.) arborvitae shurb layer in the larger niche breadth,LNB and HNB4.90、4.13.3.64、3.53and0.92、0.40、0.25、0.22,respectively; Herb layer Artemisia vestita Wall.ex Bess.、Carex lancifolia C.B. Clarke and Artemisia dubia Wall. ex Bess. prbescens sumac larger niche breadth, the LAB and HNB is for4.24、4.23、3.97and0.44、0.44、0.35. In addition, in addation, species of bigger niche breadth may has small degree of overlap with other species。(6) Using X2test, Person and Spearman rank correlation analysis interspecies relationship the Elaeagnus umbellate communities, the results are consistent,but still exist difference。37dominant population appeared inapparent negative association,indicate that Elaeagnus umbellata Thunb community is in the unstable stage of succession,its structure of community and species composition is still not perfect and stable Based on the result of interspecific association and the characteristics Plants ecological adaptation, the37dominants were divied in to two groups。...