Study on carbon storage of main forest types in southeast part of Guizhou province

The carbon storages of the main forest types in southeast of Guizhou province were investigated based on the biomass data collected from field surveys and the carbon contents of each tree organ with potassium dichromate method.The results show that the carbon storages of main forest types were from 334.32 to 566.79 t.hm-2,and the contents from the maximum to minimum was: Pinus massoniana plantation(566.79 t.hm-2),Cunninghamia lanceolata plantation(403.74 t.hm-2),deciduous broad-leaved forest(374.07 t.hm-2),evergreen broad-leaved forest(352.35 t.hm-2),coniferous and broad-leaved mixed forest(34.32 t.hm-2);in the similar forest ecosystems,the carbon storages in soil layer was the largest,with the value from 286.66 to 481.49 t.hm-2,the next was the canopy,being 15.23 ～ 74.58 t.hm-2,the third was the litter layer,while the shrubs layer and herbaceous layer were the minimum;The carbon storage in arborous layer of P.massoniana plantation was the biggest(74.58 t.hm-2),that in C.lanceolata plantation was the least(15.23 t.hm-2);the carbon storages differences among in layer of litter,shrubs and herbaceous were relatively small and not that far away;the average annual carbon sequestration of young and half-mature forests ranked by magnitude: coniferous and broad-leaved mixed forest P.massoniana plantation deciduous broad-leaved forest C.lanceolata plantation evergreen broad-leaved forest;the average annual carbon sequestration in different forest types gradually declined with the increment of the soil thickness.The carbon content rates in top soil showed that: P.massoniana plantationsconiferous and broad-leaved mixed forestevergreen broad-leaved forestdeciduous broad-leaved forestC.lanceolata plantations.The soil layer and canopy layer were the largest carbon pool in the whole forest ecosystem in the southeast of Guizhou province.