Short-term Effect of Thinning on the Growth of Chinese Fir Plantation
With the Chinese fir plantations on Jiangle State-owned Forest Farm in Fujian,we took four different thinning intensity by 50％,33％,25％ and 20％ management measures and no-thinning to study the growth of DBH,height and volume structure in different thinning intensities.The moderate thinning trees can cut small grade,and the diameter distribution curve of left type weakened.The growth of stand average diameter at breast height with the thinning intensities of 20％,25％,33％ and 50％ were 0.99,1.05,1.25,and 1.30 cm,respectively,greater than the growth of no thinning of 0.83 cm,and in the different thinning intensity,DBH growth descending order was the dominant outweigh,medium outweigh and inferior wood.The growth of stand average height after thinning intensity of 20％,25％,33％ and 50％ were 0.94,0.91,0.89,and 1.01 m,respectively,and the growth of no thinning was 0.92 m,no difference with each other.The stand density had no effect on the growth of tree height.By stand volume structure analysis,after 1-year thinning,the volume growth rate was increased with the increasing thinning intensity.
Chinese fir plantationThinning intensityThe growth of stand
NETL
NSTL
万方数据
维普
