| Particulate matter pollution is a serious air pollution problem. It has a harmful effect on plant, animal and human health no matter the particles come from natural or man-made activities. Forests has the obvious function of atmospheric particulates, improving air quality, clear forest regulation air particles of physiological processes and ecology is the study of the mechanism of important directions. In order to study the typical forest ecosystems on atmospheric particles blocking function, and the relationship between forest structure and forest block function, we select a Ribbon and Flake studied forest distribution in two common forms. This research focuses on urban areas for the study of forest ecosystems to explore Ribbon and Flake in two forest ecosystems in the seasonal variation of airborne particulate concentration distribution and diurnal variation of different season, forest eco-system on the efficiency of air particulate matter concentrations block seasonal variation and .diurnal variation, and further study of forest block airborne particulate matter concentration factors. Finally, Bayesian multivariate linear regression method, and the establishment of functional model of single-factor structure block. Based on the forest ecosystem structure and block feature coupling model and linear programming to optimize its research, ultimately regulate forest structure adjustment block the function of the forest ecosystem. The main results are as follows:(1) the band airborne particulate matter concentration in the plantation to bimodal distribution, four species of diurnal variation of size of airborne particulate matter concentration rules are basically the same, bimodal trend spring, summer first increased and then decreased unimodal trend increased after the first fall in autumn and winter of Valley type changes. Seasons four seasons second half belt on blocking efficiency of coarse particles are positive, forest belts on except spring PM2.5 fine particles blocking efficiency is positive, remaining seasons forest belt of fine particulate matter (PM2.5, PMi) blocking efficiency of all negative values. Spring forest belt on the blocking efficiency of fine particles changes with the width change of waveform. Summer forest belt on the blocking efficiency of fine particles in a straight line downward trend.(2) Four kinds of particle concentration at night than during the day, most species of airborne particulate matter concentration in the forest during the day than forest, and the night otherwise. Day blocking efficiency of most tree species of the four seasons is negative, night is positive, block the difference in efficiency between 0 and larger forest and the forest of airborne particulate matter concentration difference greater. Efficiency of various species of the four size block size in absolute terms are basically the same:Begonia, Catalpa, Ginkgo biloba< Cherry, Sophora japonica, Ash< Blue peach, Acacia, Koelreuteria Paniculata, Begonia, Catalpa tree and Ailanthus altissima. Winter forest air particulate matter concentration with the least forest airborne particulate matter concentrations.(3) Plantation on air particles real of block function and air particles real concentration, and meteorological factors and plantation structure three a factors of correlation analysis results displayed:spring summer season air particles real concentration and plantation block function significantly related, autumn related sex poor, winter basic not related; temperatures, and relative humidity and block rough particles real of capacity is are related relationship, and and fine particles real of block capacity is negative related relationship.(4) the Crown most associated with Plantation on blocking power of TSP, PM10, PM2.5, blocking efficiency of General, correlation with PM1 the worst; LAI and closed degrees of correlation basic consistent; sparse through degrees and tablets-like plantation block efficiency is negative related relationship, and TSP block efficiency related most strong, and PM10, and PM2.5 of block efficiency related sex General, and PM1 of correlation worst; plantation on air particles real concentration of block efficiency and average dbh, and average tree high, and woodland area, and herb height, and herb cover degrees basic not related.(5) through Bell leaves Republika method established has single factor structure-block function model, and multiple linear model, using linear planning of method, determine has suitable of plantation structure, suitable band-like plantation structure for:closed degrees should in [0.38,0.82] range within, leaves area index should in [1.82,3.01] range within, sparse through degrees should in [0.21,0.61] range within; suitable tablets-like-like plantation structure for:closed degrees should in [0.44,0.90] range within, Leaf area index in the [1.92,4.62] within the sparse should be [0.12,0.45] range. |
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