摘要
在冀北山地选取典型生态公益林为研究对象,比较分析抚育间伐对其林木胸径、林分单株材积和总蓄积量的影响。结果表明:1)抚育间伐促进了林木胸径的增长,间伐林分各个树种的平均胸径均大于对照林分,间伐林分胸径年平均增长量(0.52cm)是对照林分胸径年平均增长量(0.28cm)的1.86倍;抚育间伐增加了林分大径阶林木的比例,使林分径阶分布更接近正态分布,且分散程度下降;2)抚育间伐后,各个林分的单株材积均得到了提高,其中落叶松白桦混交林中落叶松单株材积年增长量增加最大;3)抚育间伐后林分蓄积生长量(45.67m3/hm2·年)比对照样地(40.16m3/hm2·年)提高了13.73%;4)抚育间伐整体上降低了林分的总蓄积量,间伐样地林分总蓄积量平均值(69.997 1m3/hm2·年)比对照样地(93.997 9m3/hm2·年)降低25.52%。因此,抚育间伐有利于生态公益林林分结构的调整,促进林分保留木的生长,改善林分与生长有关的各种生态功能的提高。
Experimental plots were established for thinning effects on the DBH, individual vol- ume and total stand volume in the representative ecological non-commercial forest （mixed broadleaf-conifer forest,larch and white birch mixed forest, larch forest, Populus davidiana forests） on mountainous area of northern Hebei province. The results show as the follows： 1） Thinning had promoted the growth of DBH,the DBH of each species in thinning stands were higher than unthinning stands. The mean annual DBH growth in thinning stands（0.52 cm） was 1.86 times that in thinning stands（0.28 cm）. Thinning had promoted the ratio of higher diameter class, and made the stand diameter distribution closer to normal distribution which-proved, the growth of individual volume of the Lari：r principis-rupprechtii in LB-4 was the largest which had increased 10 times. 3）After thinning, the total stand volume in thinning stand（45. 67m3/hm2· a）increased by 13.73% than in unthinning stand（40.16ma/hm2 · a）. 4）Thinning had decreased the total stand volume as a whole. The average of total stand volume in thinning stand（69. 9971ma/hm2 ·a） decreased by 25.52% than in unthinning stand（93. 9979ma/hm2 · a）. Therefore, thinning is propitious to adjust the stand structure of the ecological non-commer- cial forests and promote the individual volume of stands, to improve the various ecological functions of stand.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
2015年第2期31-36,共6页
Journal of Hebei Agricultural University
基金
国家林业公益性行业科研专项(201404206-02)
国家林业公益性行业科研专项(20100400205)
关键词
抚育间伐
生态公益林
胸径
材积
thinning ecological forest diameter at breast height volume
