Carbon Stock Of Main Forest Types In Fujian Province And Carbon Sequestration Of Cunninghamis Lanceolata Plantation

Carbon dioxide in the atmosphere was made to go on heightening which was likely to effect the global climate change due to misusing nature resources, especially the activities of destroying forests immoderately, burning biofuels and fossil fuels, altering manners of using the soil and draining the swamp. Forest is the principal part of the land ecosystem which does not only have the important action for maintenance of the area entironment, but also is one of important conditioners of carbon dioxide in the atmosphere. So it is very important to study the action of forest for adjusting the global carbon balance and vindicating the global climate and so on. Presently, the studies of carbon stock and carbon balance of forest ecosystem have already been reported frequently in China and abroad, but the study of factors of influencing carbon stock and carbon sequestration of the forest is reported a fat lot. Carbon stock and dynamic changes of the main forest ecosystems in Fujian Province was estimated firstly in the current study, then the factors of influencing carbon storage and carbon sequestration of Cunninghamis lanceolata plantation were studied primarily. The main conclusions were drawn as followss:(1) Total carbon storage of the main forest ecosystems in Fujian Province was 20757.540 104t , equivalent to 76110.980 X 104t of carbon dioxide and accounting for 5.6% of total carbon stocks of the whole forest in China. In the constitute of forest types, broadleaves were the most important part, secondly Pinus massoniana, thirdly Cunninghamis lanceolata and fourthly bamboo species. They were accounting for 91.9% by total carbon storage of the forest in Fujian Province. In the constitute of ages, young-aged and middle-aged forests were the most important parts which accounted for 80.07% by total carbon storage. Forest in Fujian Province will be huge potential carbon collection along with the mature and development of it.(2) Carbon storage of forest ecosystem in Fujian Province in 1998 increased by 16.74% to in 1988 (17780.756 X104t) and 18.37% to in 1993 (17535.965 X 104t) . In the constitutes of forest types, Pinus massoniana which was the most important part of carbon stock of forest ecosystem in 1988 was replaced with broadleaves in 1993 and in 1998. In addition, the degrees of Cunninghamis lanceolata and bamboo species were also advanced constantly.(3) Carbon stock of the tree of Cunninghamis lanceolata have remarkable correlativity with stand conditions, age and density. The more superior the stand conditions were, the larger carbon stock of the tree was. It will increase constantly with age. Carbon storage of the tree was also influenced by density in a certain degree. But the distribution of it was not too influenced.(4) The model of estimated carbon stock of the tree among stand conditions and age and density was used to estimate carbon stock of the tree of Cunninghamis lanceolata and may beused to forecast the influence of carbon management of the forest on carbon storage of the tree of Cunninghamis lanceolata. It has definite practical meaning.(5) Carbon stock of the soil which is the important part of carbon storage in Cunninghamis lanceolata ecosystem accounted for from 25.76% to 76.78% of total carbon stock. The extrends signifiablly positive correlation existed between carbon stock of the soil and biomass of the tree(p<0.01). It was that total nitrogen's effect on carbon stock of the soil in Cunninghamis lanceolata was largest by using path analysis among stand factors, climate factors and soil carbon stock.(6) Repeated monoculture of Cunninghamis lanceolata was unfavorable for carbon accumulation in Cunninghamis lanceolata plantation. With rotations of repeated monoculture of Cunninghamis lanceolata increased, carbon stock decreased gradually. Compared to the first generation Cunninghamis lanceolata, carbon storage of the vegetation in the second-generation and the third-generation Cunninghamis lanceolata respectively decreased by 28.44% and 42.46%. Soil carbon stock of them respectivel...