伐桩及林地地位指数对杉木萌芽更新的影响

Effects of Stump Diameter,Height and Woodland Site I ndex on Germination Renewal of Chinese Fir Planted Forest

2021年,在福建省南平市顺昌县洋口国有林场,以17年生的杉木人工林为研究对象,分析中龄林间伐1 a后不同伐桩高度(2~4、4~6、6~8、8~10 cm)、伐桩基径(6~14、14~22、22~30、30~38 cm)以及地位指数(16、20、22、24)对杉木萌芽更新的影响。研究结果表明:伐桩高度2~4 cm和4~6 cm的萌芽条数量和萌芽条根径最大,伐桩高度6~8 cm的萌芽条高度最大;伐桩基径6~14 cm的萌芽条数量最大,伐桩基径22~30 cm的萌芽条高度最大,伐桩基径14~22 cm的萌芽条根径最大;地位指数16和20的萌芽条数量、萌芽条高度、萌芽条根径均最大。总体而言,地位指数16~22、伐桩高度2~6 cm、伐桩基径14~30 cm时杉木萌芽更新效果较好。研究结果可为中林作业模式下杉木人工林的萌芽更新提供参考。

In 2021,in Yangkou State-owned Forest Farm,Shunchang County,Nanping City,Fujian Province,the 17-year-old Chinese fir plantation was taken as the research object,the different stumped heights(2~4,4~6,6~8,8~10 cm),the stumped pile diameters(6~14,14~22,22~30,30~38 cm)and the site index(16,20,22,24)of the middle-aged forest after one year of thinning were analyzed.the research shows that the number of sprout strips and the rhizome of sprout strips with the height of 2~4 cm and 4~6 cm are the largest,and the height of sprout strips of 6~8 cm is the largest;the rhizome of sprout strips with the number of 6~14 cm was the largest,the height of sprout strips of 22~30 cm was the largest,and the rhizome of sprout strips of 14~22 cm was the largest;the number of sprout strips,the height of sprout strips,and the rhizome of sprout strips were the largest at the status index of 16 and 20.In general,the germination regeneration effect of Chinese fir was better when the status index is 16~22,the height of stump is 2~6 cm,and the diameter of stump is 14~30 cm.