徐群　徐华东　李其哲　程智星

摘要：为了对树木年轮宽度进行精准辨识，研究一种基于阻抗仪的准无损活立木年轮宽度辨识方法。在凉水国家自然保护区的固定样地内，利用阻抗仪和生长锥分别采集活立木样本的阻抗数据和木芯样本，通过对阻抗数据的波形特征进行分析，构建一种活立木年轮宽度辨识方法，并对活立木样本的年轮宽度进行预测。最后对预测年轮宽度和真实年轮宽度（木芯样本分析所得）的关系进行统计分析，并建立相应的预测模型。基于阻抗波形数据预测的年轮宽度与真实年轮宽度差异很小。通过曲线拟合，幂函数模型反演真实年轮宽度的精度最高（R2=0.97）。这表明利用阻抗仪能够有效判定年轮宽度，且该方法具有快速方便、廉价和无损等优点，可能发展为一种通用方法。

关键词：活立木;年轮宽度;阻抗仪;曲线拟合

中图分类号：S781;X703.1文献标识码：A文章编号：1006-8023（2019）03-0032-04

A Method of Identifying Ring Width of Standing Tree by Using Resistograph Detector

XU Qun， XU Huadong*， LI Qizhe， CHENG Zhixing

（College of Engineering and Technology， Northeast Forestry University， Harbin 150040）

Abstract： In order to identify the tree ring width accurately， a Resistograph based method for standing tree ring width identification was studied. In a fixed plot of Liangshui National Nature Reserve， Resistograph waveform data and wood core samples of standing tree samples were collected using a Resistograph detector and a growth cone， respectively. By analyzing waveform characteristics of Resistograph data， a method for identifying  standing tree ring width was constructed， and predicted annual ring width was obtained. Finally， relationship between predicted and true annual ring width （from wood core sample analysis） was statistically analyzed， some corresponding prediction models were established. Results showed that difference between predicted annual ring width by Resistograph waveform data and true annual ring width was small. By curve fitting， the power function model had the highest accuracy in retrieving true annual ring width （R2=0.97）. It showed that Resistograph can effectively determine annual ring width. Due to its fast， convenient， cheap and non-destructive advantages， it  may become a general method.

Keywords：Standing trees; ring width; Resistograph; curve fitting

0引言

樹木年轮的意义不只是用于显示活立木的年轮数目[1-2]，还是活立木周围环境历史的记录器，它记录着过去环境的变化情况[3-4]。如果用某些特定的科学方法[5-7]加以分析和探索年轮，那么年轮中记录的气候变化过程和虫灾等灾害经历及环境污染物等均可重现[8]。在众多研究中，以树木年轮宽度作为代用资料研究仍占据主要地位，年轮宽度的测量主要是建立气候和树木生长的关系，用以过去气候历史的重建[9]。

当前有许多方法可以用来确定树木年轮的宽度。……