Dynamics of Forest Carbon Density in Xiangtoushan National Nature Reserve,Guangdong Province
In order to study the dynamics of carbon density of typical forest communities in Xiangtoushan National Nature Reserve in Guangdong province(XTSNR),five 1-hm2 forest ecosystem monitoring plots were constructed according to the vegetation type and age of the forest in XTSNR.The second censuses of the plots were conducted 5 years after the construction of the plots to analyze the changes of individual species,important values and carbon density within the plots.The results showed that:(1)With the natural restoration of the XTSNR forest,the individual density of the five plots increased significantly,and the individual density of the XTS-D plot increased the most(2356 plants·hm-2),while that of the XTS-E plot of the coniferous and broad-leaved mixed forest increased the least(228 plants·hm-2).(2)Compared with the initial census,the carbon density of XTS-A,XTS-B,XTS-C and XTS-D plots all increased,and the newly added carbon storage of mature forest XTS-D plots was the highest,with an increase of 22.41％.The carbon density of XTS-E mixed forest decreased by 9.23％.(3)The DBH class structures were different among the five plots;the middle DBH class(Ⅳ and Ⅴ)contributed the most to the carbon storage of the mature forest XTS-A sample;large DBH class(Ⅸ)had the highest carbon storage in overmature forest XTS-B;the carbon storage of young and middle-aged trees(XTS-C and XTS-D)was mainly concentrated in trees of middle and small DBH classes(Ⅱ-Ⅳ).(5)The top 10 species of carbon density in the five plots were basically the same.Although Pinus massoniana in XTS-E plot was still a tree with high carbon density and important value,its individual number and important value decreased.Among the five plots,broad-leaved tree species showed the fastest increase in carbon density.
forest carbon densityplant communityimportant valueXiangtoushan National Nature Reserve
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