秃杉林和连栽杉木林生物生产力及其分配特征

The Biomass Productivity and Distribution of the Taiwania flousiana Plantation and Successive Rotation Plantation of Cunninghamia lanceolata

对广西南丹县23年生秃杉(Taiwania flousiana)林和连栽杉木(Cunninghamia lanceolata)林生物量和生产力进行研究。结果表明:23年生秃杉林和连栽杉木林各器官生物量分配存在差异,秃杉林为干材>树根>树枝>树叶>树皮,连栽杉木林为干材>树根>树枝>树皮>树叶;23年生秃杉林和连栽杉木林乔木层生物量分别为195.21、136.32t/hm^2,其中干材生物量分别为118.32、87.91 t/hm^2;2种林分乔木层年净生产力分别为8.49、5.95 t/(hm^2·a),其中干材净生产力分别为5.14、3.82 t/(hm^2·a)。因此,秃杉林比连栽杉木林具有较高的生物量积累能力,可以作为杉木人工林采伐迹地更新的替代树种。

The biomass and productivity in the 23-year-old Taiwania flousiana plantation and successive rotation plantation of Cunninghamia lanceolata were studied in Nandan county.Results showed that there existed differences in the biomass of different organs ofT.flousiana plantation and successive rotation plantations of C.lanceolata,and theT.flousiana plantation was trunk>root>branch>leaf>bark,while the successive rotation plantations of C.lanceolata was trunk>root>branch>bark>leaf.The biomass of tree layer of 23-year-old T.flousiana plantation and successive rotation plantations of C.lanceolata were 195.21 t/hm2 and 136.32 t/hm2,respectively,among which trunk biomass was 118.32 t/hm2 and 87.91 t/hm2,respectively.The annual net productivity of tree layer of 23-year-oldT.flousiana plantation and successive rotation plantations ofC.lanceolata were 8.49 t/(hm2·a)and 5.95 t/(hm2·a)with trunk net productivity of 5.14 t/(hm2·a)and 3.82 t/(hm2·a),respectively.Therefore,T.flousiana plantation has higher biomass accumulation ability than that of successive rotation plantations ofC.lanceolata,and can be used as an excellent substitute tree for the regeneration of C.lanceolata plantation.