Ⅰ-72杨人工林生物量的研究

THE BIOMASS OF (1-72/58) POPLAR PLANTATION

本文就集约经营的Ⅰ-72杨6种密度人工林的生物量进行了测定与研究。按平均标准木法测定了Ⅰ-72杨地上部分生物量。文中还研究了不同密度的单株生物量、林分生物量及各年份的净生长量。根据调查数据、按相对生长法建立了估测林木干、皮、枝及叶生物量的幂函数方程。研究结果表明:6年生Ⅰ-72杨人工林平均总生物量(地上部分)为64—122t/ha。林分生物量与密度呈正相关;净生产量在10t/ha·a以上,高的可达20t/ha·a。林木地上部分(树干、树皮、树枝、树叶)的生物量比例分别为60—70％:10—12％:12—21％:3—5％。林分生物量的连年生长在造林后第三年开始大幅度增长。到调查年龄(第6年)为止,林分平均生物量仍保持上升趋势。林分密度的变化对单株及林分生物量均有显著影响。

In six kinds of densities. above-ground biomass of six-year-old poplar plantation (Ⅰ-72/58)was compared on intensively cultured plots in Shan dong province. The average-sampling-tree method was used to estimate the biomass and the net production of the poplar plantation of different age The biomass yields of six-year-old poplar plantation ranged from 64 to 122 t/ha in six kinds of densities; The higher the density, the more biomss of plantation was. The greatest net production was 20 t/ha. yr. in higher planting density (1000 trees/ha) and some others were over 10 t/ha. The proportions of biomass composition. (stems, barks, branches and leaves) were respectively as follows: 60—70％: 10—12％: 12—21％: 3—5％. The yield of biomass was increasing rapidly after second year in each density plantation and it still kept the increasing tendency when they were investigated. Allometric method was used too. The results of above mentioned two methods were compared. The comparision showed that both ways to estimate the biomass of poplar (Ⅰ-72) plantation were suitable.