基于林木多期直径测定数据的异龄林年龄估计方法Ⅱ  

Age estimation method Ⅱ of uneven-aged forest based on the data of multistage diameter measurement

作　　者：龙时胜 曾思齐[1] 甘世书[2] 肖化顺[1] 刘洵 向博文 LONG Shisheng;ZENG Siqi;GAN Shishu;XIAO Huashun;LIU Xun;XIANG Bowen(Central South University of Forestry and Technology, Changsha 410004, Hunan, China;Central South Forest Inventory and Planning Institute of State Forestry Administration, Changsha 410014, Hunan, China)

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]国家林业局中南林业调查规划设计院,湖南长沙410014

出　　处：《中南林业科技大学学报》2019年第6期23-29,59,共8页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(201504301);中南林业科技大学研究生创新基金项目(20181001)

摘　　要：基于林木多期直径测定数据,拟合直径与年龄相关的生长模型,为异龄林年龄结构的确定提供估计方法。以木荷异龄林为研究对象,通过确定异龄林林分内各树种的年龄变异范围,对林木第一期测量直径取随机年龄,获取林分内所有林木的直径与年龄信息对,进而利用Richards方程拟合各树种的直径生长方程,最后将加权平均直径代入生长方程求算出各树种及林分的平均年龄。结果表明:1)木荷异龄林林分内木荷树种的年龄变异范围为[-7.46*ln(1-(D/20.06)^0.371),-17.24*ln(1-(D/26.78)^0.381)],马尾松的年龄变异范围为:[-8.55*ln(1-(D/15.32)^0.478),-6.41*ln(1-(D/10.01)^0.326)],杉木的年龄变异范围为:[-10.75*ln(1-(D/21.04)^0.587),-10.53*ln(1-(D/12.20)^0.576)]。2)木荷估计年龄与真实年龄的最大绝对误差≤3年,最大绝对相对误差<20%,平均绝对百分误差<11%;马尾松估计年龄与真实年龄的最大绝对误差≤1年,最大绝对相对误差<10%,平均绝对百分误差≤5%;杉木估计年龄与真实年龄的最大绝对误差≤3年,最大绝对相对误差≤15%,平均绝对百分误差<10%;林分估计年龄与真实年龄的最大绝对误差均≤3年,最大绝对相对误差均<20%,平均绝对百分误差均<11%,预测效果较好,其估计方法可以应用于科研和生产实践。Based on the multi-stage diameter measurement data of forest trees, the study fitted the growth model between the diameter and age, aimed to provide an estimation method for the determination of age structure of uneven-aged forest. By determining the age variation range of different tree species in Schima superba uneven-aged forest, the first stage diameter of trees was measured at random age, furthermore, the diameter and age information of all the trees in the stand were obtained.The Richards equation was used to fit the diameter growth equation of each species,then the average age of each species and the forest were calculated by substituting weighted mean diameter. Results showed that: 1) The age variation range of the schima superba species in Schima superba uneven-aged forest was [-7.46*ln(1-(D/20.06)^0.371),-17.24*ln(1-(D/26.78)^0.381)], the age variation range of the Pinus massomiana was [-8.55*ln(1-(D/15.32)^0.478),-6.41*ln(1-(D/10.01)^0.326)], the age variation range of the Cunninghamia lanceolata was [-10.75*ln(1-(D/21.04)^0.587),-10.53*ln(1-(D/12.20)^0.576)]. 2) The maximum absolute error between the estimated age and the real age of Schima superba was not more than three years, the maximum absolute relative error was less than 20%, and the average absolute percentage error was less than 11%. The maximum absolute error between the estimated age and the real age of Pinus massomiana was not more than one years, the maximum absolute relative error was less than 10%, and the average absolute percentage error was not more than 5%. The maximum absolute error between the estimated age and the real age of Cunninghamia lanceolata was not more than three years, the maximum absolute relative error was not more than 15%, and the average absolute percentage error was less than 10%. The maximum absolute error between the estimated age and the real age of stand was not more than three years, the maximum absolute relative error was less than 20%, and the average absolute percentage error was less than 11%. The predic

关 键 词：多期直径 异龄林 林分年龄 

分 类 号：S758.56[农业科学—森林经理学]