Study on the carbon storage and distribution of Pinus massoniana Lamb plantation ecosystem at different growing stages

Pinus massoniana Lamb is one of the most important tree species of timber plantations in South China,playing an important role in mitigating the rise of atmospheric CO_2.The carbon content and carbon storage of Pinus massoniana Lamb at different growing stages were measured.The results were showed as follows:The carbon contents of the tree,litter and soil for 100 cm depth were in the sequence of MP(mature-plantation)MAP(middle-aged plantation)MP(young plantation),whereas the carbon content of understory layer was in the sequence of MAPYPMP.The carbon storage of Pinus massoniana Lamb plantation ecosystem increased with the increment of age,of which the MP was 1.72 times as that of YP,and 1.20 times as that of MAP respectively,and most of the differences among forest ecosystems occurred in the tree layer.