36年生红锥天然次生林生物量研究

Study on Biomass of 36 Year Old Natural Secondary Forest of Castanopsis hystrix

[目的]研究36年生红锥天然次生林的生物量、生产力。[方法]采用样方收获法对红锥单株生物量、林分生物量和生产力进行研究,建立红锥各个器官的生长模型。[结果]平均木各器官生物量所占比例大小分别为树干>大枝>根蔸>树皮>叶>粗根>小枝>枯枝>中根>细根,平均木单株生物量达到1 253.389 kg/株,树干的生物量为705.593 kg/株,占到了整株生物量的56.29%;乔木层生物量为689.364 t/hm^(2),占林分总生物量的98.67%;红锥天然次生林分生产力为35.013 t/(hm^(2)·年),乔木层净生产力为31.803 t/(hm^(2)·年),占林分总生产力的90.83%;对红锥各个器官生物量进行生长方程拟合,结果表明树干、树皮、活枝、树叶、根系都以三次函数方程拟合最好。[结论]该研究可为红锥天然次生林的可持续发展经营提供指导。

[Objective] The aim of this study was to research the biomass and productivity of 36 year old Castanopsis hystrix natural secondary forest. [Method] The biomass per plant,stand biomass and productivity of C. hystrix were studied by quadrat harvesting method,and the growth model of each organ of C. hystrix was established. [Result] The proportion of biomass of each organ of average tree was trunk > big branch > root stump > bark > leaf > thick root > twig > withered branch > medium root > fine root. The average biomass of individual tree reached 1 253.389 kg/tree,and the biomass of trunk was 705.593 kg/tree. The biomass of tree layer was 689.364 t/hm^(2),accounting for 98.67% of the total stand biomass. The stand productivity of C. hystrix secondary forest plantation was 35.013 t/(hm^(2)·a)and the net productivity of tree layer was 31.803 t/(hm^(2)·a),accounting for 90.83% of the total productivity of the stand. The biomass of each organ of C. hystrix was fitted by the growth equation. The results showed that the cubic function equation was the best for stem,bark,live branch,leaf and root. [Conclusion] This study can provide guidance for the sustainable development and management of natural secondary forest of C. hystrix.