砍灌和间伐对杉木人工林生长的影响

Effects of Shrub Cutting and Thinning on the Growth of Cunninghamia lanceolata Plantations

通过在青阳县连续3年开展幼龄林砍灌除草和中龄林间伐对杉木人工林生长等的影响研究。结果表明,砍灌除草处理的平均胸径增长率比对照高出14.13%,不同时期、处理间对杉木幼龄林胸径都有显著的影响(P=0.02<0.05,P=0.03<0.05);砍灌除草处理的树高增长率比对照高出4.54%,不同时期对杉木幼龄林树高有极显著的影响(P=0.00<0.01),但处理间对杉木幼龄林树高影响不显著(P=0.71>0.05)。间伐处理的平均胸径增长率比对照高出1.35%,不同时期、处理间对杉木中龄林胸径均有极显著的影响(P=0.008<0.01,P=0.001<0.01);间伐处理的平均树高增长率比对照高出3.24%,不同时期对杉木中龄林树高有极显著的影响(P=0.000<0.01),处理间对杉木中龄林树高有显著的影响(P=0.031 4<0.05)。抚育措施对杉木人工林生长具有重要影响,本研究旨在为试验区杉木人工林结构优化和高效培育提供依据。

In this paper a 3-year-long study was made on the effects of shrub cutting and weeding （CSW） in young forest and thinning in middle-aged forest on the growth of Cunninghamia lanceolata plantations in Qingyang County. The results showed that the DBH growth rate of the plantations treated with CSW was 14.13% higher than that of the control group, and different times and treatment had significant effects on the DBH growth of the young plantations （P〈0.05 = 0.02, P=0.03〈0.05）; the height growth rate of the plantations treated with CSW was 4.54% higher than that of the control group, and different times had highly significant effects on the height growth of the young plantations （P=0.00〈0.01） while the treatment showed no significant effects （P=0.71 〉0.05）; the mean DBH growth rate with thinning treatment was 1.35% higher than that of the control group, different times and treatment had highly significant effects on the DBH growth （P=0.008〈0.01,P=0.001〈0.01）; the mean height growth rate of the middle-aged plantations with thinning treatment was 3.24% higher than that of the control group, the monitoring time had highly significant effects on the height growth of the middle -aged plantations （P=0.000〈0.01）, and the treatments had significant effects on the height （P=0.0314〈0.05）. Tending measures had significant effects on the growth of C. lanceolata plantations. The study was aimed to provide basis for the structure optimization and highly efficient cultivation of C. lanceolata plantations in the test area.