Community Structure And Leaf Function Characters Of Quercus Liaotungensis On Different Slopes In Lingkongshan,Shan Xi

The study of community structure has an indispensable theoretical and practical significance for the protection of species diversity,the sustainable management and optimal utilization of plant resources.At the same time,plant functional properties have been the focus of ecological research since the last century,which can directly describe the response of species to the changes of the external environment.Among them,leaf functional properties are the most widely studied and have irreplaceable research value,which is closely related to the acquisition and utilization of resources.Taking Quercus liaotungensis Forest in Lingkong mountain of Shanxi Province as the research object,the community structure characteristics of different community levels in different slopes were analyzed.At the same time,8 leaf functional properties of Quercus liaotungensis community,including leaf length,maximum leaf width,leaf thickness,leaf length width ratio,leaf dry matter content,specific leaf area,leaf tissue content and leaf water content,were selected for correlation and difference study.The following conclusions are drawn:(1)Quercus liaotungensis is rich in plant species.The total number of plant species was in shade slope > sunny slope > half shade and half sunny slope.Quercus liaotungensis is a constructive species.(2)Among 7 kinds of life types in Quercus liaotungensis of Lingkongshan Mountain,the high bud and underground bud were the main life forms of Quercus liaotungensis community.(3)The diametral structure and vertical structure of Quercus liaotungensis population in the three slopes are similar,and all of them belong to spindle type.(4)The dominant species of the three slope-downward arbor species was Quercus liaotungensis.The dominant species on the sunny slope of the shrub layer is The Shield spear,the half-shade and half-shade slope is the squirrel plum,and the best one for studying the cloudy slope.The main life forms of Quercus liaotungensis community in Lingkong mountain,Shanxi Province are the two kinds of life forms: high bud plant and underground bud plant.(5)The shannon-Wiener index and richness index of the arbour layer had the largest negative slope and the Pielou evenness index had the largest positive slope.Shannon-wiener index and Pielou uniformity index of shrub layer were the smallest in the positive slope,while richness index was the largest in the positive slope.Herbaceous layer Shannon-Wiener index had the largest negative slope,richness index had the largest positive slope,and Pielou evenness index had the largest negative and positive slope.(6)The slope direction had a greater impact on the correlation between leaf functional properties.There are significant differences in leaf water content,leaf thickness,leaf tissue density,leaf length width ratio and sub dry matter content at 0.01 level in different slopes,while the difference of specific leaf area was significant at 0.05 level,and the difference of leaf area and maximum leaf width was not significant.(7)There was a significant positive correlation between the maximum leaf width and leaf area(P < 0.01),and a significant negative correlation between leaf water content and dry matter content(P < 0.01).There is a difference between the correlation of leaf functional traits between high and low density,indicating that the density will affect the correlation of leaf functional traits.The leaf thickness and specific leaf area of high-density Quercus liaotungensis were larger than that of low-density Quercus liaotungensis,and the dry matter content of high-density Quercus liaotungensis was higher than that of low-density Quercus liaotungensis.Slope under the leaf tissue density difference was not significant,Yin half sunny slope and slope of leaf tissue density as a density increases to a trend of increase the reduction,under the sun and shade half sunny slope leaf area and leaf width of the size of the biggest is increases with density increase with the decrease of the first,Shady slope is along with the density increases,the ratio of leaf width in three kinds of slope downward regularity is not obvious.