Effects of Density Regulation on Carbon Storage of Pinus massoniana Plantation Ecosystem
An investigation of the effects of density regulation on carbon deposits was conducted on a 12-year-old Pinus massoniana plantation located in Taijiang County of Guizhou Province.Besides the control (CK,without regulated,2 610 plant · hm-2),three densities were set up:high (H,1 800 plant · hm-2),medium (M,1 566 plant · hm-2),and low (L,1 350 plant · hm-2).The results showed that density regulation helped improving the carbon accumulation in the tree layer,understory vegetation and litter layer.The amounts of carbon storage was in the order of tree layer＞soil layer ＞ litter layer ＞ undergrowth layer under all densities.The carbon storages in tree layers with high,medium and low densities were 2.58,5.69,and 1.38 t · hm-2 higher than that of the control;in soil layer,3.50,4.95,and 13.43 t · hm-2 higher,in litter layer,1.88,2.59,and 4.14 t · hm-2 higher;and in undergrowth layer,0.14,0.27,and 0.36 t · hm-2 higher.The carbon storages of understory vegetation and undergrowth layer were significantly different compared with CK(p＜0.05).The total carbon storages of the ecosystem with H and M densities were 8.1 t · hm 2 and 13.49 t · hm-2 higher than the CK,and with L density,7.54 t · hm-2 less than the CK.It was concluded that the total carbon storage of P.massoniana plantation ecosystem with M density was the highest,indicating that M density should be adopted in the management of middle-age P.massoniana plantation.
carbon depositsplantationecosystemPinus massonianadensity control
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NSTL
万方数据
维普
