Effect of National Reserve Forest Conversion and Harvesting Intensity on the Growth of Pinus massoniana Plantation
This study aims to investigate the impact of cutting intensity on the growth of Pinus massoniana plantations in the national reserve forest.The research object was then selected as the Pinus massoniana plantations in Shiqian County,northeastern Guizhou Province.The forest age(medium-aged forest and nearly mature or over-ma-ture forest)and canopy density(medium and high canopy density)were also combined as well.Three cutting inten-sities were implemented:light cutting(LT)with 10%～20%removal,moderate cutting(MT)with 21%～30%re-moval,and heavy cutting(HT)with 31%～40%removal.Variance analysis and Duncan's multiple comparison anal-ysis were carried to investigate the influence of cutting intensity on the growth of Pinus massoniana after three-year observations.The results indicate that the cutting intensity significantly dominated the diameter at the breast height and individual tree volume of Pinus massoniana.The most sensitive effects were found in the medium-aged forests with the medium canopy density.The annual growth rate of these forests increased with the intensity of cutting.While there was the limited promotion effect of cutting intensity on tree height growth.It was recommended to prioritize the medium-aged forests with the medium and high canopy densities,as well as nearly mature or over-mature forests with the medium canopy density,under the cutting intensity of 31%～40%after comparison.The finding can provide a strong reference to cultivate the Pinus massoniana with the large-diameter timber in the national reserve forest.
National reserve forest cultivationcutting intensityPinus massonianaincrement
NETL
NSTL
万方数据
维普
