抚育间伐对杉木牛长影响的成效分析

发布时间：2018-01-14 11:20

  本文关键词：抚育间伐对杉木牛长影响的成效分析　出处：《中南林业科技大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 杉木 抚育间伐 抚育成效 湖南省

【摘要】：森林抚育是促进林木生长、提高林木质量、实现森林多种效益最大化的必不可少的措施。杉木在湖南人工用材林中具有举足轻重的影响,是森林抚育的重点树种。本研究依托中央财政森林抚育补贴试点项目,以抚育样地和对照样地为一组,在湖南省范围内设置了 8组共16个样地,包括杉木中龄林和近熟林,观测抚育对林木生长的影响,连续4年,分析抚育对杉木胸径、树高、单株材积和单株生物量年生长和连年生长的影响,对抚育成效进行评价,以期为进一步做好森林抚育工作提供科学依据。主要研究结果如下:1)抚育样地林分平均胸径生长量明显大于对照样地。抚育样地林分平均胸径年生长量为B1(苏仙区)最高达1.7 cm·a-1,林分平均胸径年生长量排序为B1(苏仙区)A1(攸县)D1(金洞区)/H1(岳阳县)C1(苏仙区)G1(岳阳县)E1(金洞区)F1(泸溪县);林分胸径年均生长量抚育与对照差值以D(金洞区)为最大值为0.45 cm·a-1,F(泸溪县)最低为0.07 cm·a-1。抚育对杉木的胸径生长具有明显促进作用,平均抚育效益达到47.7%。抚育效益最高的金洞区样地,抚育效益大于70.0%,抚育效益最低为攸县样地,抚育效益不足10.0%。中龄林的抚育效果明显好于近熟林。2)抚育样地与对照样地林分平均树高年生长量相差不大,林分树高年均生长量抚育与对照差值相差苏仙区B最大为0.12 m·a-1,金洞区D产生了 0.03负值。总体上,抚育间伐对杉木树高生长的促进作用不大,平均抚育效益只有14.5%。3)抚育样地杉木单株材积生长量明显大于对照样地。单株材积年均生长量A1(攸县)最大为0.0273 m3·a-1,排序为A1(攸县)D1(金洞区)H1(岳阳县)B1(苏仙区)G1(岳阳县)E1(金洞区)C1(苏仙区)F1(泸溪县);单株材积年均生长量抚育与对照的差值D(金洞区)最大为0.0088 m3·a-1,F(泸溪县)最小为0.0015 m3·a-1。抚育对杉木的材积生长具有明显促进作用,平均抚育效益达到37.5%。抚育效益最高的金洞区E组样地,抚育效益大于60.0%,抚育效益最低为攸县样地,抚育效益不足10.0%。4)抚育样地杉木单株生物量生长量明显大于对照样地。单株生物量年均生长量A1(攸县)最高为15.14 kg·a-1,排序为A1(攸县)D1(金洞区)H1(岳阳县)G1(岳阳县)B1(苏仙区)E1(金洞区)C1(苏仙区)F1(泸溪县);单株生物量年均生长量抚育与对照的差值H(岳阳县)最大为4.8 kg·a-1,F(泸溪县)最低为0.78kg·a-1。抚育对杉木的生物量增长具有明显促进作用,平均抚育效益达到36.0%。抚育效益最高的金洞区E组样地,抚育效益大于60.0%,抚育效益最低为攸县样地,抚育效益不足10.0%。
[Abstract]:Forest tending is an indispensable measure to promote forest growth, improve forest quality and maximize forest benefits. Chinese fir has a significant influence in Hunan artificial timber forest. This study relies on the pilot project of central fiscal forest tending subsidy, and set up 8 groups of 16 sample plots in Hunan province, taking tending sample plots and opposite plots as a group. The effects of tending on the growth of Chinese fir (Cunninghamia lanceolata) for 4 years were observed. The effects of tending on DBH, height, volume and biomass of Chinese fir were analyzed. The effect of upbringing was evaluated. The main results are as follows: 1). The average DBH growth of tending plots was significantly larger than that of the control plots, and the annual average DBH growth of tending plots was up to 1.7 cm 路a-1 in Suxian district. The order of annual average DBH growth of stand is B1 (Suxian District) A1 (Youxian County D1) (Jindong District Ju / H1 (Yueyang County C1) (Suxian District G1) (Yueyang County F1) (Jindong District F1 (Luxi County)); The difference between average annual increment of DBH and control was 0.45 cm 路a ~ (-1) in Jindong area. The lowest value of F (Luxi County) was 0.07 cm 路a ~ (-1). Tending had obvious promoting effect on the growth of DBH of Chinese fir, and the average tending benefit was 47.7 cm 路a ~ (-1). The upbringing benefit was more than 70.00.The lowest was you county sample land. The tending effect of middle age forest was better than that of near mature forest. The difference between the average annual growth of stand height and the difference between the difference of the difference between the average growth of stand height and the control was 0.12 m 路a ~ (-1) in Suxian district, and 0.03 negative value was produced in D in Jindong area. Tending and thinning had little effect on the growth of Cunninghamia lanceolata. The average tending benefit was only 14.5. 3) the volume growth per plant of Chinese fir was significantly larger than that of the control plot, and the maximum annual volume growth A _ 1 (you county) was 0.0273 m3 路a ~ (-1). The order is A1 (Youxian D1) (Yueyang County B1 (Yueyang County B1) (Yueyang County G1) (Yueyang County D1) (Suxian District F1) (Luxi County 1); The difference between the average annual growth of volume per plant and that of the control was 0.0088 m3 路a ~ (-1) in the Jindong area, and the maximum value was 0.0088 m ~ (3) 路a ~ (-1). The minimum of F (Luxi County) is 0.0015 m3 路a ~ (-1). Tending plays a significant role in promoting the volume growth of Chinese fir (Cunninghamia lanceolata). The average tending benefit was up to 37.5.The group E sample land in Jindong district, which had the highest tending benefit, had tending benefit more than 60.00.The lowest tending benefit was you county sample land. The annual biomass growth of Chinese fir was 15.14 kg 路a ~ (-1) in the tending sample area, which was significantly larger than that in the same land, and the annual biomass growth per plant was 15.14 kg 路a ~ (-1) in Youxian County, the highest annual biomass growth rate was (15.14 kg 路a ~ (-1)). The order is A1 (Youxian D1) (Yueyang County G1 (Yueyang County G1) (Yueyang County B1) (Suxian District D1) (Suxian District F1) (Suxian District F1 (Luxi County); The difference between the average annual growth of biomass per plant and that of the control, H (Yueyang County), was 4.8 kg 路a ~ (-1). F (Luxi County) was the lowest 0.78 kg 路a ~ (-1). Tending significantly promoted the biomass growth of Chinese fir, and the average tending benefit was 36.0. The upbringing benefit is more than 60.0, the lowest is you county sample land, and the tending benefit is less than 10.0.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S791.27
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本文编号：1423369