摘要
为了探明不同立地及间伐强度对马尾松林生长的影响,在桂西北田林县西部选择6年生马尾松人工幼林设置固定监测样地,即间伐强度30%、25%、20%和0%(ck为对照)依次为A区1 050、1 125、1 200、1 500株.hm-2;B区1 400、1 500、1 600、2 000株.hm-2;C区1 500、1 600、1 700、2 125株.hm-2。经过连续5a的观测,当林分生长至11年生时得出如下结果:1)A区间伐强度20%以及B区和C区间伐强度分别为30%对胸径生长较大,分别比不间伐提高2.2%～10.5%;2)A区、B区和C区间伐强度依次为20%、25%和30%对树高生长较大,分别比不间伐提高0.6%～6.3%;3)A区间伐强度20%以及B区和C区间伐强度分别为30%对单株蓄积生长较大,分别比不间伐提高3.1%～24.9%,但林分单位面积蓄积则分别比不间伐下降5.9%～24.2%。
In order to verify the effects of different sites and thinning intensities （TIs） on the growth of the young Pinus massoniana plantations,three fixed monitoring sampling plots （labeled A,B,and C） were set up in 6-year-old plantations with different site conditions. Three TIs （30 %, 25 %, 20 %, and control 0 %） were adopted in each sampling plot, and the tree densities corresponded to each thinning intensity were plot A：1 050,1 125,1 200,and 1 500 tree . hm-2,plot B：1 400,1 500,1 600,and 2 000 tree . hm-2,plot C： 1 500,1 600,1 700, and 2 125 tree . hm- 2, respectively. After 5-year continuous observation when the stands were 11-year-old,positive effects on the growth of DBH （diameter at breast height） were observed in plot A with TI of 20% ,and plot B and C with the TI of 20% ,increased by 0.6% to 6.3%. For the height growth,3.1% to 24.9%increases were found in plot A,B,and C with TIs of 20%,25% ,and 30% ,respec- tively. Higher volume growth of individual tree was found in plot A with the TI of 20 % ,and plot B and C with TIs of 30%,increased from 3.1%to 24.9 % fro, the stock volume per unit area however, decreased by 5.9% to 24.2%.
出处
《西北林学院学报》
CSCD
北大核心
2013年第1期141-145,共5页
Journal of Northwest Forestry University
基金
桂西北干热河谷区马尾松大径材培育技术研究(桂百科计字[2007-19号])
关键词
马尾松
人工幼林
立地因子
间伐强度
林木生长
桂西北地区
Pinus massoniana
planted young forest
site factor
thinning intensity
forest tree growth
northwestern Guangxi
