Effects of Inti ial Planting Spacing on Growth and Above-ground Biomass of Populous Plantation
A plot survey was conducted in a 5-year-old Populous plantation with four planting spacing (spacing of 2 m×3 m, 2 m× 4 m, 2 m×5 m, and 2 m×6 m) to study the influence of initial spacing on the growth and biomass accumulation .Initial planting spacing had significant effects on diameter at breast height ( DBH) and single tree volume ( P<0.05) , but had no significant effects on single tree height and stand biomass .With the increase of planting density , single tree DBH , tree vol-ume, crown and individual above-ground biomass were decreased , but stand biomass was increased .DBH and tree height were positively correlated to stem , branch and leaf biomass .The equation of y=-0.400 6x2+16.671x-104.12 was applica-ble to the relationship between individual above-ground biomass and DBH .In terms of a combination of stand level biomass accumulation, we suggested a planting density of 2 m×3 m for plantation in western plain area of Shangdong Province .
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