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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