A PRELIMINARY STUDY ON CONES''BIOMASS OF PINUS TABULAEFORMIS PLANTATION
油松人工林球果生物量的初步研究

The relation of the cones' biomass of Pinus tabulaeformis to site conditions and factors of mensuration was studied by measuring the cones' biomass of average tree of Pinus tabulaeformis plantation under the different site conditions. The results of our study have showed that the cones' bicmass of Pinus tabulaeformis is most on the ridge and the southern slope of a mountain, moderate on its northern slope and least in its valley. There is a positive correlation between the cones' biomass of Pinus tabulaefor...