| In recent years, with the development of industry, the decrease of forest area and the destruction of biodiversity, large amounts of CO2and other harmful gases enter into the atmosphere, so that the global climate warms and the greenhouse effect is getting more and more serious. Along with the signing of "Kyoto Protocol" and the convening of South Africa and Durban Climate Congress, reducing emission and increasing carbon sink become the focus of attention of scholars and experts at home and abroad. In the terrestrial carbon cycle, forests are the body of absorbing CO2, therefore researching forest vegetation Carbon storage has a positive significance.Guang xi province is one of the important southern forest regions, and its forest vegetation types are rich. In this paper, the major forest vegetation Carbon storage and density in PingGui Management district of Guangxi are researched, and its dynamic change of two periods is analyzed, depending on the data of Forest management Inventory in2009and1999of PingGui Management district, Guangxi, with the use of biomass conversations factor function, combining with GIS technology. The primary results are:(1) The major forest vegetation Carbon storage in2009and1999of PingGui Management district is1645868.9t and1322930.9t,and its average carbon density is14.6t/hm2å'Œ11.5t/hm2.which is much lower than the average of the national and Guangxi province, indicating that there is a very large increase in potential in the forest carbon of the researched area.(2) Distributions of forest vegetation carbon storage and density by sublots in1999and2009were made by the use of GIS, and the condition of spatial distribution was analysised. According to comparative analysis of carbon storage, carbon density, area and population number by different towns, it is shown that human disturbance is limited to distribution of forest vegetation carbon storage.(3) The carbon storage of arboreal forest is1340323.1t and937633.0t in2009and1999with an occupation81.4%and70.9%of the total, which shows that arboreal forest play an important role in the local carbon pool. The Carbon storage of Chinese fir and Masson pine take the first place in arboreal forest with526883.0t and336563.7t in2009,398260.8t and361526.6t in1999.(4) The age group structure changes of arboreal forest have an important influence on carbon storage and carbon density. The carbon storage of all arboreal forest age groups in 2009in decreasing order is as follows:near mature forest, middle mature forest, mature forest, young forest, over mature forest; The area:middle mature forest, near mature forest, young forest, mature forest, over mature forest; The carbon density:over mature forest with42.3t/hm2, mature forest with28.9t/hm2, near mature forest with18.6t/hm2, middle mature forest with15.6t/hm2, young forest with3.6t/hm2; The carbon storage of all arboreal forest age groups in2009in decreasing order is as follows:middle mature forest, young forest, near mature forest, mature forest, over mature forest; The area:young forest, middle mature forest, near mature forest, mature forest, over mature forest; The carbon density:over mature forest with24.8t/hm2, mature forest with22.0t/hm2, near mature forest with19.3t/hm2, middle mature forest with13.5t/hm2, young forest with4.9t/hm2. The mature forest and over mature forest area were only accounted for10.0%and9.6%of the total area of the respective woodland, which shows that the carbon pool potential is enormous along with the changes of age group structure and the increase in the area of mature forest and over mature forest.(5) According to the structural analysis of carbon storage in the study area, policies and safe guard mechanism for increasing carbon storage of local forest vegetation have been put forward. |
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