【摘要】 探讨了广西禄峰山林场16年生4种密度湿地松Pinuselliottii人工林生态系统的碳积累、分配及与林分密度的关系。结果表明:4种密度湿地松人工林生态系统碳库的空间分布序列均为土壤层>植被层>死地被物层,碳库总量范围为264 834～323 978t·hm-2,平均为291 663t·hm-2,随着林分密度的增大而增加。植被层的碳贮量范围为96 614～110 717t·hm-2,占碳库总量的35 40%,各组分碳贮量排列均为树干>树根>树枝>树叶,碳贮量的地上/地下之比为7 185～7 922,随着密度的增大而下降。随着林分密度的增加,死地被物层的碳贮量由5 746t·hm-2增加至9 181t·hm-2,占2 17%～2 83%。土壤层(0～60cm)的碳贮量平均为180 94t·hm-2,占60 32%以上。密度组Ⅰ,密度组Ⅱ,密度组Ⅲ和密度组Ⅳ的年净固定碳量依次分别为9 729t·hm-2,9 882t·hm-2,11 239t·hm-2和11 946t·hm-2,平均为10 699t·hm-2。表7参16更多还原

【Abstract】 Carbon accumulation and distribution were studied in 16-year-old experimental slash pine plantations with four kinds of different densities at Lufeng Forest Farm in Guangxi Autonomous Region.The results indicated that the spatial distribution sequence of carbon storage ranked as soil layer>vegetation stratum>litter floor,the total carbon storage ranged from 264.834 t·hm~ ( -2) to 323.978 t·hm~ ( -2) ,with an average value of 291.663 t·hm~ ( -2) ,and increased along with enlarging of density in 4 kinds of different densities of slash pine plantation ecosystem.Carbon storage of vegetation stratum ranged from 96.641 t·hm~ ( -2) to 110.717 t·hm~ ( -2) ,amounted for 35.40% of the total carbon storage.Carbon storage of different components all was in the order as trunk>root>branch>leaf,and the carbon storage ratio of the over ground and the under ground ranged from 7.185 to 7.922 and descended along with enlarging of density in the vegetation stratum.Carbon storage of litter floor increased from 5.746 t·hm~ ( -2) to 9.181 t·hm~ ( -2) along with enlarging of stand densities,occupied 2.17% to 2.83% of the total carbon storage.Carbon storage of forest land soil(0～60 cm) averaged 180.94 t·hm~ ( -2) ,occupied more than 60.32% of the total carbon storage.Annual net fixing carbon amounts of density Ⅰ,Ⅱ,Ⅲ,Ⅳ were 9.729,9.882,11.239 and 11.946 t·hm~ ( -2) ,respectively,with an average value of 10.699 t·hm~ ( -2) .These results could provide some basic data for the carbon budget estimation of a forest ecosystem and dynamic simulation.[Ch,7 tab.16 ref.]更多还原