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在全国杉木中心产区福建选择杉木幼龄林、中龄林和成熟林,进行不同发育阶段杉木人工林生态系统各组分含碳率、碳贮量和年净固碳量的比较研究。结果表明:不同发育阶段杉木林乔木层、林下植被层和凋落物层含碳率介于40.25%~53.52%之间,均表现为中龄林最大,成熟林次之,幼龄林最小;而0~100 cm土层土壤含碳率则表现为成熟林最大,中龄林次之,幼龄林最小。随林龄增大,杉木人工林生态系统碳贮量逐渐增大,成熟林分别是幼龄林和中龄林的1.63倍和1.19倍,而这种差异主要是由乔木层碳贮量差异引起的。不同发育阶段杉木林年净固碳量表现为中龄林最大,分别比幼龄林和成熟林大3.487 t/(hm2.a)和3.748 t/(hm2.a),其中中龄林乔木层年净固碳量分别比幼龄林、成熟林大2.713 t/(hm2.a)和3.033 t/(hm2.a),占总差异的77.8%和80.9%。
Cunninghamia lanceolata forest, middle-aged forest and mature forest were selected to study the carbon sequestration, carbon storage and annual net carbon sequestration in different components of the Chinese fir plantation ecosystem. The results showed that the carbon content of arbor, understory and litter layer in different development stages ranged from 40.25% to 53.52%, which were the highest in middle age, the second in mature and the youngest in young. Soil carbon content in 0-100 cm soil layer was the largest in mature forest, followed by middle-aged forest, and smallest in young-aged forest. With the increase of forest age, the carbon storage of Eucalyptus plantation ecosystem increased gradually, while that of mature forest was 1.63 times and 1.19 times of that of young forest and middle age forest, respectively. However, this difference was mainly caused by the difference of carbon storage in arbor layer of. The net carbon sequestration of Cunninghamia lanceolata plantations in different developmental stages was the largest in the middle-aged stands, which were 3.487 t / (hm2.a) and 3.748 t / (hm2.a) higher than the young and mature stands, respectively. Among them, The annual net carbon sequestration was 2.713 t / (hm2.a) and 3.033 t / (hm2.a) respectively, accounting for 77.8% and 80.9% of the total respectively.