湖南省栎类天然次生林胸径地位指数表研制  

Establishment of a diameter at breast height site index table for natural secondary oak forest in Hunan Province

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

机构地区：[1]中南林业科技大学林学院,湖南长沙410004 [2]国家林业和草原局中南林业调查规划设计院,湖南长沙410014

出　　处：《森林与环境学报》2019年第3期265-272,共8页Journal of Forest and Environment

基　　金：国家林业公益性行业科研专项"闽楠;青冈栎次生林提质增量关键技术研究与示范"(201504301);中南林业科技大学研究生创新基金项目(20181001)

摘　　要：为了对湖南省栎类天然次生林的立地质量进行准确的分析与评价,编制了湖南栎类天然次生林胸径地位指数表。以湖南省国家森林资源连续清查(1989—2014年,共6期)复查结果中以栎类为优势树种的146个样地的399组胸径-年龄数据为建模样本,首先拟合各种胸径生长方程,根据决定系数(R^2)、残差平方和(SSE)以及均方根误差(RMSE)确定最优导向曲线方程;然后,根据胸径变动系数随年龄变化趋于平缓时的年龄作为基准年龄,根据基准年龄时胸径的绝对变动幅度以及指数级个数的比值确定指数级距(C);最后利用标准差调整法、变动系数调整法以及相对胸径法分别编制湖南栎类天然次生林胸径地位指数表。结果表明:通过对7个常用的数学模型进行胸径生长方程的拟合,最后选定逻辑斯蒂方程作为最优导向曲线方程,选择基准年龄为40 a,指数级距为3 cm,编制了湖南栎类天然次生林胸径地位指数表。根据样本胸径理论值和实际值进行卡方检验的结果以及同一个样地的地位指数跳级情况,判别地位指数表的准确程度。检验结果表明,3种方法中相对胸径法编制的地位指数表精度最高,其卡方检验值低于临界值,同时验证样地的地位指数有跳级现象的样本数占总样本数23.6%,并且只是上下各跳一级,说明所编的地位指数表具有较高的准确性,可用于湖南省栎类天然次生林的立地质量评价。In order to accurately analyze and evaluate the site quality of natural secondary oak forest in Hunan Province, China, a diameter at breast height (DBH) site index table of natural secondary oak forest in Hunan Province was compiled. Based on a continuous review of the national forest resources in Hunan Province from 1989 to 2014, a total of 399 pairs of DBH-age data from 146 plots dominated by oak species were used as modeling samples. First, the growth equations for DBH were fitted. The optimal guiding curve equation was determined by the coefficient of determination ( R 2), the sum of squares due to error (SSE), and the root mean squared error (RMSE). Then, the datum age was calculated according to the age at which the variation coefficient of the DBH tended to vary little with age. The exponential distance was determined according to the ratio of the absolute variable range of the DBH at the datum age to the exponential number. Finally, the DBH site index tables for natural secondary oak forests in Hunan Province were compiled using the standard deviation adjustment method, the coefficient of variation adjustment method, and the relative DBH method. The results showed that the growth equation for DBH could be fitted by seven commonly used mathematical models. The logistic equation was selected as the optimal guiding curve equation. The datum age was 40, and the exponential distance was 3 cm. The standard deviation adjustment method was used to compile the DBH site index table for natural secondary oak forest in Hunan. The accuracy of the DBH site index table was determined from the results of a chi-square test of the theoretical values and the actual values for the DBH sample and whether there was an advanced placement of the status index at the same sample site. The test results showed that the site index table compiled by the relative DBH method was the most accurate. Its chi-square test value was lower than the critical value, and the number of samples that showed a jump phenomenon for the site index in th

关 键 词：栎类 天然次生林 胸径 年龄 地位指数 湖南省 

分 类 号：X821[环境科学与工程—环境工程]