采脂对湿地松幼林生长的影响与效益分析  

Analysis of resin tapping on growth influence and profit of young Pinus ellottii plantation

作　　者：唐生森 韦理电 蒙春江 杨章旗[1] 

机构地区：[1]广西壮族自治区林业科学研究院,广西南宁530002 [2]环江毛南族自治县华山林场,广西环江547100

出　　处：《中南林业科技大学学报》2017年第11期96-102,共7页Journal of Central South University of Forestry & Technology

基　　金：广西林业厅项目(2016-1);八桂学者专项经费(2011A015);国家"十二五"科技计划(2012BAD01B0203-4)

摘　　要：通过对5年生湿地松幼林连续5年的常规采脂,分析采脂对湿地松幼林生长的影响及其经济效益,研究开展湿地松早期利用的可行性。结果表明:采脂对5年生湿地松林木生长的抑制作用主要表现在前2年,对林木胸径、树高、单株材积生长均存在较大的负面影响;林木枯损率随采脂年数增加快速上升,到第5年时,采脂林分的枯损率为51.5%,是非采脂林分的2.5倍;松脂产量不稳定,第2年产脂量最高,整体随采脂年数的增加、林木径阶的减小而下降;若在10年生主伐,采脂林可获得98 919.8元/hm^2的松脂产值,是非采脂林分原木产值的3.6倍,采脂林分和非采脂林净现值分别为32 338.49元/hm^2和-2 977.4元/hm^2,内部收益率分别为39.5%和7.8%,采脂林分折现率远大于12%,非采脂林分折现率低于12%。综合分析认为,采脂对速生期的湿地松生长具有显著的抑制作用,使林木生长提前进入生长缓慢期;林木枯损主要出现在采脂后期,导致林分蓄积量损失严重,合理的采脂周期有待研究;松脂产值是开展湿地松早期利用的主要收益来源,而且效益可观,有利于缩短投资收回周期。After five years resin tapping of young slash pine in 5-year. Analyze the influence on growth and economic benefits after resin tapping. Then research the feasibility of slash pine early utilization. The results showed that： There has a big negative impact on 5 a born slash pine tree growth after resin tapping in the first two years. It could inhibit the growth of DBH, height, and individual volume. Tree Mortality increased with resin tapping rapid rise in the number of years. To the fifth year, resintapping stands mortality rate was 51.5%, it was 2.5 times as non-resin tapping stand. The turpentine production was not stable, has a highest yield in the second year, and declined with the increase of resin tapping years and the diameter decreases reduce. If final felling at 10 years old of slash pine tree, resin tapping stands would take a resin production of 98 919.8 yuarv＇ hm2, it was 3.6 times as non-resin tapping stand. Resin tapping and non-resin tapping stand have a NPV of 32 338.5 yuan/hm： and -2977.4 yuan/hm2 respectively, with an IRR of 39.5% and 7.8% respectively. Resin tapping stand IRR was much greater than 12%, but non-fat stand IRR was less than 12%. Comprehensive analysis showed that： There was a significantly inhibited on the fast-growing period of slash pine grown since resin tapping, so that advance forest growth into the slow growth period; Tree mortality occurred in the late of resin tapping was the cause to stand volume loss serious, a reasonable resin tapping period for further study; Resin tapping earnings was the main source income of carried out early utilization on slash pine, took a considerable benefits, and shorten the payback period.

关 键 词：湿地松 采脂 生长量 经济效益 

分 类 号：S791.246[农业科学—林木遗传育种]