天然更新的檫木林的生物量和生产力

Biomass Production and Productivity of Natural Regenerated Sassafras tzumu Trees

摘要:

通过对标准木的测定,建立相对生长方程,研究了福建省建阳书坊林场天然更新的擦木（Sassafras tzumu）林分的生物量和生产力,结果表明:20年生擦木林分平均现存生物量为58 693 kg hm^-2,平均年生产力为4 259 kg hm^-2,擦木生物量与胸径间存在极显著回归关系,大部分生物量集中于树体中下部,生物量的径级分布以20 cm径级积累值最大。这些结果对阔叶林的营造及共生态系统结构与功能的研究具有现实意义。

Abstract:

Biomass production and productivity of a Sassafras t.zumu forest were measured by models of allometry method in Jianyang Shufang Forest Farm of Fujiang Province. The forest was naturally regenerated by dominant S. tzumu after final cutting of Cunninghamia lancenlata plantation at about 20 year's succession with density of S. tzumu trees ca. 480 individuals per ha. The results showed that mean total biomass production and mean annual productivity of S. tzumu trees were 58 693 kg hm^-2 and 4 259 kg hm^-2, respectively．Vertical distribution of biomass indicated that most biomass was accumulated below middle height of trees．In accordance with the diameter class distribution of biomass，the maximum biomass appeared at trees with 20 cm dbh．This research is useful for broad-leaved forest planting．