摘要
设置3个年度修枝高度至6、5、4 m和不修枝A、B、C、D(CK)四个处理,研究修枝对立木生长、林下光照及植被的影响。结果表明:修枝对杉木生长无显著影响,处理A、B、C与对照比,树高增益分别为-1.05、-0.62、-0.43个百分点,胸径增益分别为-1.05、-0.16、0.22个百分点,材积增益分别为-2.50、-1.60、1.40个百分点,波动范围极小。不同强度修枝林冠下光照率存在极显著差异,处理A、B、C分别比不修枝提高25.30、13.39、7.30个百分点。不同强度修枝林下植被种类及鲜重也存在极显著差异,与对照比,处理A、B、C植被种类分别增多275%、250%、200%,植被鲜重分别增加483%、428%、386%。
4 treatments(A,B,C and D)of 3 annual pruning heights to 6 m,5 m and 4 m and no pruning(CK)were set up to study the effect of pruning on growth of Chinese fir,understory light and vegetation.The results showed that there was no obvious influence of pruning on the growth of Chinese fir.The tree height increment was-1.05%,-0.62%and-0.43%,the DBH increment was-1.05%,-0.16%and 0.22%,and individual volume increment was-2.5%,-1.6%and 1.4%with treatments A,B and C compared with control,respectively,with very small fluctuation range.There was an extremely significant difference in light rate with different pruning intensities.The light rate with treatments A,B and C was 25.30%,15.39%and 7.30%higher than that in control,respectively.There was an extremely significant difference in understory vegetation species and fresh weight.The amount of understory vegetation species with treatments A,B and C was 275%,250%and 200%,and the fresh weight was 483%,428%and 386%higher than that in control,respectively.
作者
何善情
HE Shanqing(Forestry Bureau of Huitong County,Huitong 418300,China)
出处
《湖南林业科技》
2020年第1期18-23,共6页
Hunan Forestry Science & Technology
基金
国家科技支撑计划“针叶树速生丰产林定向培育技术研究”(2015BAD09B0101)
关键词
修枝
杉木
生长
光照强度
植被
pruning
Chinese fir
growth
light intensity
vegetation
