攸县黄丰桥国有林场大径材杉木实验形数与出材率研究OA
Study on the experimental shape number and timber yield rate of large diameter Cunninghamia lanceolata in Huangfengqiao state-owned forest farm of Youxian County
[目的]培育大径材一直是杉木林经营的关键目标.实验形数与出材率作为衡量大径材杉木质量的重要指标,在精准计算材积及评估价值方面发挥着至关重要的作用.[方法]以湖南省株洲市攸县黄丰桥国有林场为研究区,首先,选取 50 棵径阶为 32～46 cm的大径材杉木,计算实验形数并分析其随胸径和树高的变化规律;其次,利用大径材杉木胸径和树高、树干去皮和带皮直径数据,编制大径材杉木一元出材率表,通过对各径阶杉木出材率的加权平均,计算大径材杉木的平均出材率.[结果]大径材杉木实验形数取值范围为 0.370～0.489,平均值为0.412,随着胸径的增加而减少,随着树高的增加呈现先增加后减少再增加的趋势;大径材杉木平均出材率取值范围为 74.62%～84.93%,平均值为 82.07%,且随径阶的增大而减小.[结论]大径材杉木平均实验形数与实践中采用的杉木平均实验形数0.42 相差不大,使用杉木平均实验形数0.42 计算杉木材积,不会影响杉木的材积与价值评估;大径材杉木平均出材率高于实践中常采用的杉木平均出材率72.00%,当林分内大部分杉木为大径材时,使用72.00%估算大径材材积会低估杉木的材积与价值.研究结果可为攸县黄丰桥林场与其他地形和气候条件相似地区的大径材杉木材积估算和价值评估提供理论参考.
[Objective]Cultivating large-diameter timber is always the key objective of Chinese fir(Cunninghamia lanceolata)forest management.The experimental shape number and timber yield rate,as important indexes to measure the quality of the large-diameter timber fir,play a crucial role in accurately calculating its volume and evaluating its economic value.[Method]In this study,Huangfengqiao state-owned forest in Youxian County,Zhuzhou City,Hunan Province was selected as the research area.Firstly,fifty large diameter Chinese fir trees with diameter level of 32-46 cm were selected to calculate the experimental shape number and analyze the change law with DBH and tree height.Secondly,using the data of tree height,DBH with bark and DBH without bark,the yield table of large-diameter Chinese fir was prepared.The average timber yield rate of the large-diameter Chinese fir was calculated by weighted average of the yield rate in each diameter level.[Result]The experimental shape number of large-diameter fir tree ranged from 0.370 to 0.489,with an average value of 0.412,which decreased with the increase of DBH,and showed a trend of first increasing,then decreasing and then increasing with the increase of tree height.The average wood yield rate of the large-diameter timber Chinese fir ranged from 74.62%to 84.93%,and the average value was 82.07%,and it decreased with the increase of diameter level.[Conclusion]The average experimental shape number of the large-diameter Chinese fir is not much different from the experimental shape number of 0.42 usually used in practice.Thus,using 0.42 to calculate the volume of the fir would not affect the timber yield rate and economic value of Chinese fir.The average timber yield rate of the large-diameter timber of Chinese fir is higher than the average timber yield rate of 72.00%commonly used in practice.Therefore,in the stand with the majority of Chinese fir are large-diameter timber,using 72.00%to estimate large-diameter timber yield rate will underestimate the timber yield rate and economic value of Chinese fir.This study can provide a theoretical reference for the volume estimation and economic value assessment of the large diameter fir trees in Huangfengqiao Forest Farm in Youxian County and other areas with similar terrain and climate conditions.
张心怡;刘祺;叶剑阳;吕蒙;骆家富;奉永轩;唐涛
中南林业科技大学,湖南 长沙 410004中南林业科技大学,湖南 长沙 410004中南林业科技大学,湖南 长沙 410004中南林业科技大学,湖南 长沙 410004长沙木丰农林科技有限公司,湖南 长沙 410004长沙木丰农林科技有限公司,湖南 长沙 410004中南林业科技大学,湖南 长沙 410004
农业科技
杉木大径材实验形数出材率黄丰桥林场
Cunninghamia lanceolatalarge diameter timberexperimental shape numbertimber yield rateHuangfengqiao forest farm
《中南林业科技大学学报》 2026 (2)
80-88,9
湖南省教育厅优秀青年项目(22B0252)湖南省自然科学基金项目(2022JJ31000)国家自然科学基金自主项目(31470642).
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