中国油松生物量的研究

依据853株标准木、425块标准地实测资料对中国各地油松单木生物量、林分生物量及林分第一性生产力进行了分析比较。

A Study on the Biomass of Chinese Pine Forests

Based on 853 sample trees and 425 plots, the biomass of individual tree, the biomass of stands and the net primary productivity of Chinese Pine (Pinus tabulaeformis Carr. ) forests are studied. The allom-etric equation lnW=a+b ln(D2H) is fit to every component of the biomass of individual tree. The ratios of the stem, of the branch and of the leaf to the biomass aboveground are around 70%, 20%and 10% respectively. The underground biomass is about 23% of the aboveground biomass. The mean biomass of stands is around 60t/ha for 14-29year old stands and 130t/ha for 30-70 year old stands. The regression equation lnW=a + b ln(pD2H) is fit to each component of the biomass of a stand. The net primary productivity of Chinese Pine stands averages around 9 t/ha · a. The hightest is 12 for east Liaoning and the lowest is 6 for west Liao-ning. The productivity (NP) increases with the increase of precipitation (P), NP=- 0.545 + 0.0143P. The productivity of underground biomass is around 25% of that of aboveground. The average leaf efficiency(NP/Wleaf) is 1.3t/a·t, the hightest 1.74 is found in east Liaoning and the lowest 0.87 in north Hebei. The average productivities of Chinese Pine forests in 4 climatic regions are : (Ⅰ) the warm temperate semi-moist region 7 t/ha·a; (Ⅱ) the warm temperate wet semi-moist region 9; (Ⅲ) the warm temperate moist region 11. and (Ⅳ) the subtropical moist region 14.