赤皮青冈人工林生长及生物量估算  

Biomass estimation of the growth law of Cyclobalanopsis gilva plantations

作　　者：刘娜 李志辉[1] 王佩兰[1] 李何 LIU Na;LI Zhihui;WANG Peilan;LI He(College of Forestry,Central South University of Forestry and Technology,Changsha 410004,Hunan,China)

机构地区：[1]中南林业科技大学林学院,湖南长沙410004

出　　处：《中南林业科技大学学报》2022年第5期143-149,共7页Journal of Central South University of Forestry & Technology

基　　金：国家科技支撑计划项目(2012BAD21B03);湖南省自然科学基金青年基金项目(2021JJ41069);中央财政林业科技推广项目([2018]XT 07号);湖南省林业种苗专项项目“赤皮青冈优良种质资源收集保存技术与评价”。

摘　　要：【目的】研究赤皮青冈Cyclobalanopsis gilva人工林的生长规律,为赤皮青冈人工林的培育以及合理经营提供科学的理论基础,同时,也为培育和推广珍贵用材树种提供科学依据。【方法】在湖南省涟源市龙山国有林场34年生赤皮青冈人工林内设置标准样地(20 m×20 m),选择3株平均木进行树干解析,分析解析木的胸径、树高、材积的生长过程及生物量分布。【结果】34年生赤皮青冈去皮胸径总生长量为25.18 cm,在0~6 a,胸径生长过程处于缓慢状态,6~21 a生长速度加快,21~34 a胸径生长逐渐趋于平缓,且胸径生长随着树龄的增加不断增加。胸径连年生长量在12 a时达到峰值,为1.07 cm,12 a后逐渐下降并逐渐趋于平稳状态。赤皮青冈胸径平均生长量曲线变化稳定,胸径平均生长量在18 a时达到最大值,为0.8033 cm/a;34年生赤皮青冈树高总生长量为19.6 m,且树高总生长量随着年龄的不断增加而增加,0~6 a树高生长过程缓慢,12~34 a树高增长速度加快,且树高连年生长量波动变化明显,平均生长曲线和连年生长曲线分别在19、27 a时相交;34年生赤皮青冈材积总生长量为0.4254 m^(3),材积总生长量随着树龄的增长呈现出递增的关系,是一个先缓慢后加快的增长过程,材积总生长曲线呈“S”型,材积连年生长量和平均生长量曲线呈逐渐上升的趋势,且在34 a时连年生长量和平均生长量曲线还未相交,说明34年生赤皮青冈的材积仍处于增长的速生期,未达到数量成熟年龄;34年生赤皮青冈总生物量为422.867 kg,全树生物量分布以树干占比最高,其次为树根、树枝,树叶的生物量占比最低,树根生物量占比为粗根>中根>细根。【结论】34年生赤皮青冈仍未达到数量成熟龄,根据解析木分析情况预测赤皮青冈人工林将在60 a时达到主伐年龄,建议今后的抚育管理措施以调整林分密度和空间结构为主。【Objective】This study was conducted to investigate the growth law of Cyclobalanopsis gilva plantations,aiming to provide a scientific basis for the effective cultivation and management of C.gilva plantations.In the meantime,it provided the scientific basis for the promotion of the rare timber tree species.【Method】A standard plot(20 m×20 m)of the 34-year-old C.gilva plantation was set up in Longshan State-owned Forest Farm in Lianyuan,Hunan Province.Three average trees were selected from the standard plot for stem analysis and the growth law of DBH and height.In addition,the volume and biomass distribution were analyzed.【Result】The total DBH growth of the 34-year-old C.gilva plantation was 25.18 cm,which growth was slow at 0-6 a,and then became fast at 6-21 a and gradually flattened at 21-34 a.Overall,the DBH increased with the increase of tree age.The annual increment of DBH was the greatest at 12 a,and then gradually declined and flattened.The average growth curve of DBH of C.gilva was stable,and the maximum DBH was 0.8033 cm/a at 18 a.The total height growth of the 34-year-old C.gilva plantation was 19.6 m,which increased with tree age.The height growth was slow at 0-6 a,and then accelerated at 12-34 a.The annual increment of height fluctuated significantly,and the average growth curve and annual increment curve intersected at 19,27 a.The total volume growth of the 34-yearold C.gilva plantation was 0.4254 m3,which showed a positive relationship with tree age.The increase of total volume growth was gradually accelerated with tree age,and the total volume growth curve showed an“S”type.The annual increment curve and the average growth curve of volume displayed a gradual upward trend,and these two curves had not intersected at 34 a.This indicated that the 34-year-old C.gilva plantation was still in the fast-growing period of volume and did not reach the stage of quantitative maturity.The biomass of the 34-year-old C.gilva was 422.867 kg,and the proportion of stems was the highest,followed by roots

关 键 词：赤皮青冈 人工林 生长规律 生物量 

分 类 号：S718.556[农业科学—林学]