不同经营模式杉木人工林乔木层碳储量研究

Plantations carbon storage in arbor layer for different management models of Cunninghamia lanceolata plantation

以中林龄杉木人工林为研究对象,通过对自然演替(模式1)、近自然经营(模式2)和间伐集约经营(模式3)3种经营模式林分样地的林木胸径、树高、蓄积量、生物量及各器官组织含碳率的跟踪测定与估算,分析比较不同经营模式杉木人工林生长及乔木层碳储量差异。结果表明:自然演替(模式1)的林分林木平均胸径、树高及蓄积量均最低,依次分别为17.31 cm、14.3 m和222.57 m^(3)·hm^(-2);近自然经营(模式2)和集约经营(模式3)的平均胸径、树高及蓄积量均较高,且差异不显著。不同经营模式由于林分密度存在差异,林木各器官生物量也呈现出较大差异,主要表现为:树干>根>枝>树皮>叶;各经营模式间林木生物量最大的为集约经营(模式3),其次为近自然经营(模式2),林分生物量最小的经营模式是自然演替(模式1)。不同经营模式碳储量因林木生物量不同也呈现出较大差异,其中乔木层碳储量最大的经营模式是集约经营(模式3),乔木层总碳储量为129.17 t·hm^(-2),其次是近自然经营(模式2)(106.45 t·hm^(-2)),自然演替(模式1)的乔木层总碳储量最小,仅为85.81 t·hm^(-2);各经营模式林木器官组织碳储量分布格局相同且和生物量分布格局具有相似性,同样表现为树干>根>枝>树皮>叶。

Taking the medium-aged Cunninghamia lanceolata plantation as the research object,the differences in the growth of C.lanceolata plantations and the carbon storage of arbor layer were compared and estimated by the tracking determination and estimation of the growth of it and the carbon storage of arbor layer in three business modes:natural succession(mode 1),near-natural management(mode 2),and thinning intensive management(mode 3).The results showed that the average breast diameter,tree height and volume of stand trees without disturbing natural management were the lowest,at 17.31 cm,14.3 m and 222.57 m 3·hm^(-2),respectively.The average breast diameter,tree height and stock volume of near-natural(mode 2)and intensive management(mode 3)were high,and the differences were not significant.Due to the difference in stand density,the biomass of various organs of forest trees also showed great differences in different management modes,mainly as follows:trunk>roots>branches>bark>leaves.Among the business models,the largest forest biomass was thinning intensive management mode 3,followed by near-natural management(mode 2),and the business mode with the smallest stand biomass was natural management(mode 1).Among them,the largest carbon storage in the arbor layer was thinning intensive management(mode 3),the total carbon storage of the arbor layer was 129.17 t·hm^(-2),followed by the near-natural management(mode 2)(106.45 t·hm^(-2)),and the total carbon storage of the natural management(mode 1)was the smallest,only 85.81 t·hm^(-2).The distribution pattern of carbon storage of forest organs and tissues in each business mode was the same and similar to the distribution pattern of biomass,which was also manifested as trunk>roots>branches>bark>leaves.