The Factor On Carbon Stocks Of Platyclatdus Orientalis Plantation In Xuzhou

The Plantation is an important part of carbon storage in terrestrial ecosystems, the carbon ofplantation is affected by human activities, natural factors, stand condition and so on. the P.orientalis plantations as object of study in this paper, We got the carbon of understory shrubs,herbs, litter, the soil carbon reserves through field survey, use the models of the dry weight fordifferent P. orientalis biomass organs, this paper Estimate the Carbon storage of the Platyclatdusorientalis Plantation ecosystems at different stand density, different age, different thinning, theresults showed that:(1) Three different stands density of P. orientalis plantation unit area average carbon storagewere as follow:94.11t/hm2and (1679individual/hm2),79.06t/hm2and (2250individual/hm2),73.32t/hm2and (3074individual/hm2),in which, the carbon stocks of treelayer,understory shrub, herb layer and litter layer are decreased with the stand densityincreasing, the proportion of Carbon reserves in the soil layer in the system was increasedwith the increase in stand density.(2) Three different age of P. orientalis forest plantation ecosystems per unit area average carbonstocks were as follows: the40a P. orientalis forest plantation is90.67t/hm~2,48a P. orientalisforest plantation is82.60t/hm2and55a P. orientalis forest plantation is109.54t/hm~2,theindividual of P. orientalis plant biomass showing a rising trend with the stand age increased,the proportion of Tree layer of carbon reserves in the total ecosystem carbon storageshowing a clear upward trend with the ages increase, the biomass of Various organs of thetree layer with the increase of forest age increase. The results of soil organic carbon storage indifferent age of P. orientalis Plantation as follow: the40a P. orientalis Plantation is60.67t/hm~2,48a P orientalis Plantation is48.12t/hm~2,55a P. orientalis Plantation is56.00t/hm~2.(3) The secondary thinning plots (76.36t/hm~2)>the carbon reserves in first thinning plots(73.30t/hm~2)> the carbon reserves of original thinned plots(68.54t/hm~2), in which the tree layer ofcarbon reserves is as follow: the first thinning plots(37.35t/hm~2)> the secondary thinningplots (30.42t/hm~2)> the original thinned plots(28.13t/hm2), in the secondary thinning plotthe carbon reserves tree layer was significantly reduced, the individual biomass wassignificantly increased. The carbon stocks of soil layer showed that: the layer of soil carbonstock changes for thinning secondary (39.38t/hm~2)> original thinning (36.09t/hm~2)> firstthinning (32.47t/hm~2). The prediction conclusions is moderate thinning can increase thecarbon storage in P. orientalis Plantation ecosystems.