| In this paper, the natural secondary broad-leaved mixed forest in Youhua Town,Zhubei Town of Qingyang county and Yeshan forest farm of Tongling county as theobject of study, the representative position has been chosen to set up sample sites.Calculate the spatial structure of all forest type’s spatial structure parameters and soilphysical and chemical nature of the indicators, analysis and comparison of differentforest types in spatial structure characteristics and the corresponding types of soilphysical and chemical physical and chemical properties and their relationship to eachother, Provide the basis for Stand spatial structure adjustment and optimization ofvegetation recovery, improve soil fertility, woodland water conservation functionevaluation and so on.Type I is the Deciduous forest composed of Quercus acutissima Carruth, Quercuschenii Naka and Liquidambar formosana Hance; Type Ⅱ is the D eciduo us broad-leavedforest composed of Quercus and Zelkova serrata; Type Ⅲ is the D eciduo us broad-leavedforest composed of Quercus acutissima Carruth, Castanopsissclerophylla,Cyclobalanopsis glauca and Quercus acutissima Carruth; Type Ⅳ isthe Deciduous broad-leaved forest composed of Quercus acutissima Carruth,Platycarya strobilacea and Liquidambar formosana Hance. Stand dominant tree speciesof the four forest types are Quercus acutissima, Carruth, stand diameter normaldistribution test showed that the diameter of structural features of the stand diameterdistribution were the same age forest stands.The total average uniform angle of this4forest types is0.49、0.51.0.51and0.56, theoverall spatial distribution pattern of Type I, TypeⅡand Type Ⅲ isrando m distribution,Type Ⅳ is reunion distribution, Quercus acutissima Carruth as the dominant treespecies is random distribution. But the Quercus acutissima Carruth as the dominanttree species showed a weak degree of mixed, and associated tree moderate to severemixed. The average size of each type of stand number descending order TypeⅣ（0.52）,TypeⅡ（0.50）, Type Ⅰ（0.49）, Type（0.47）, the overall growth of trees in moderationgrowth momentum; stand dominant species in the average size than the associatedspecies than the number of general.This4forest types in soil pH increased with increasing soil depth, soil showed acid.The average total N of various types of trees between0.72-1.58g/kg, the average total P of various types of trees between0.58-0.80g/kg, the average total K of various types oftrees between6.03-24.11g/kg, total K content is higher than total N and total P. AvailableN average content is49.15-102.93mg/kg, available N average content is5.99-8.52mg/kg,available K average content is47.73-88.29mg/kg, available N content is higher thanavailable K and available P, Low content of available P, In the mild to moderate barren,available K in moderate barren, Subtropical regions characteristics of soil nutrient.The capacity of various types of soil quality with increasing soil depth and increased,saturated moisture content, total porosity, capillary porosity and non-capillary porositytrend changes in the quality and soil capacity trends in the opposite. Various types of soilquality capacity of type II (1.407)> type I (1.367)> Type III (1.324)> Type IV (1.045),Type IV soil is the most loose, permeable ventilation best performance, Various types ofsoil total porosity weighted mean as follows:45.6%,44.0%,44.6%and54.8%(Table5-9), TypeⅣof soil perm eability of the best, Type I, Type II and Type III soilpermeability can be considerable.Various types of soil water-holding capacity, capillary water and capillary waterwith soil depth changes with the corresponding soil porosity variation. Type II (2639.3t/hm~2and) and type III (2674.4t/hm~2and) the overall soil maximum water holdingcapacity quite, Type Ⅳ whole, the soils water-holding capacity of the largest (3289.6t/hm~2);This4forest types in soil overall non-capillary water-holding capacity in orderwas the type II (641.5t/hm~2), type IV (550.0t/hm~2), type III (544.0t/hm~2and) and type I(533.9t/hm~2),Type Ⅱ non-capillary water-holding capacity strong, Type I and Type III,Type IV non-capillary water-holding capacity gap difference is little.Stand spatial structure and soil nutrient index existed correlation, at the0.05significance level, mingling index and neighborhood comparisom and all P content hadcorrelation. The fitting equation is: Y=0.226X11.625x2+1.395, the regression analysistesting of residuals wa smaller.Stand spatial structure index and the soil to hold water each indicator there is acertain correlation, degree of confidence but only stand angle scale and soil non-capillarywater content model in more than99%,significant correlation, the expression isY=587.177x–119.153... |
PDF Full Text Request