中文摘要：

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0～100cm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3．487t／（hm^2·a）和3．748t／（hm^2·a）．其中中龄林乔木层年净固碳量分别比幼龄林、成熟林大2．713t／（hm^2·a）和3．033t／（hm^2·a）．占总差异的77．8％和80．9％。

英文摘要：

Chinese fir （ Cunninghamia lanceolata （ Lamb. ） Hook. ） , a fast - growing evergreen coniferous tree with high yield and excellent quality, is one of the most important tree species of timber plantations in the South China,the total area of which is around 9.11 million hectares in China, playing an important role in mitigating the rise of atmospheric CO2. The carbon content, carbon storage and annual carbon net fixation of Chinese fir of different growing stages were measured. The results were as follows：the carbon content of the tree, litter and understory layer was in the sequence of MAP （ middle - aged plantation ） 〉 MP（ matureplantation） 〉 MP（young plantation）, whereas the carbon content of soil at the depth from 0 to 100 cm was in the sequence of MP 〉 MAP 〉 YP. The Carbon storage of Chinese fir plantation ecosystem increased with the increasement of age , which of MP was 1.63 times that of YP, and 1.19 times that of MAP, respectively, and most of the differences among forest ecosystems were in the tree layer; the annual net carbon fixation of MAP was 3.487 t/（hm^2 · a） more than that of YP, and 3. 748 t/（hm^2 · a） more than that of MP, of which 77.85% and 80.9% were in the tree layer.