不同发育阶段马尾松人工林生态系统碳贮量研究

对福建马尾松幼龄林、中龄林和成熟林生态系统中各组分的含碳率和碳贮量进行了比较研究。结果表明,不同发育阶段马尾松乔木层和凋落物层的含碳率为48.12%~52.59%,表现为成熟林最大、中龄林次之、幼龄林最小,0~100 cm土壤层含碳率亦表现出同样的规律,而林下植被层含碳率则表现为中龄林最大、幼龄林次之、成熟林最小;随林龄增大,马尾松林乔木层、凋落物层和土壤层碳贮量均逐渐增加,决定了生态系统总碳贮量亦逐渐增加,成熟林生态系统碳贮量为183.94 t/hm2,分别是幼龄林和中龄林的1.72倍和1.20倍,这种差异主要是由乔木层碳贮量的差异引起的。

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 MAP>YP>MP.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.