Density Control of Slash-pine Pulpwood Forest and Its Management

An experiment was conducted on different types of thinning and planting density to explore a density control over slash-pine pulpwood forest and its management technology.Results show that there are significant differences in breast-diameter,height,volume and total yield with 8-year-old and 12-year-old stands, and obvious differences in wood property with 8-year-old stands of different densities;and that the growth of height,breast-diameter,volume and wood property of 8-year-old corresponds to stand density: the more trees,the higher the height;the less trees,the bigger the breast-diameter;the more trees,the greater the volume,and the density of a medium size,the best the property.Results also show that the suitable initial planting space is 2 m×2 m and 2 m×2.5 m;so the planting density is 2 505 trees /hm2 and 1995 trees /hm2;and that after 4 years of thinning,when 2 505 treess/hm2 stand undergoes a reduction of 25% and 1995 trees/hm2 stand does 20%,the volume reaches 224.08 m3·hm-2 and 206.64 m3·hm-2 and the total yield including the thinning volume reaches 244.56 m3·hm-2 and 218.72 m3·hm-2.In order to cultivate slash-pine pulpwood forest with good quality and high yield,8-year-old stands should undergo a thinning of 20 to 25% reduction.