应用照片测量技术提取和自动校正年轮宽度  

Automation for measuring tree ring width and its correction based on photogrammetry

作　　者：罗春旺[1] 于健[1,2] 刘琪璟[1] 徐倩倩[1,3] 张国春[1,4] LUO Chun-wang YU Jian LIU Qi-jing XU Qian-qian ZHANG Guo-chun(College of Forestry, Belting Forestry University, Belting 100083, China jiangsu Polytechnic College of Agriculture and Forestry, Jurong 212400, Jiangsu , China Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China Sichuan Forest Inventory and Planning Institute, Chengdu 610081, China）.)

机构地区：[1]北京林业大学林学院,北京100083 [2]江苏农林职业技术学院,江苏句容212400 [3]中国农业科学院郑州果树研究所,郑州450009 [4]四川省林业调查规划院,成都610081

出　　处：《生态学杂志》2016年第10期2845-2851,共7页Chinese Journal of Ecology

基　　金：国家"863"计划项目(2013AA122003);江苏农林职业技术学院科技项目(110751168);国家林业公益性行业科研专项项目(200804001)资助

摘　　要：年轮宽度是进行树轮气候学、树木生长规律及森林生产力测算研究的重要环节,其偏差大小直接影响上述测量结果的准确性和精度。为简单并准确测量年轮宽度,本文介绍了一种借助常用的图象处理软件量测年轮宽度的方法。首先对年轮样品进行扫描,在扫描图像的基础上,利用遥感图像处理软件对样芯的年轮宽度进行提取,并根据三角函数原理对倾斜年轮进行宽度校正,整个过程实现自动化。结果表明:未经校正的年轮宽度与经过校正的年轮宽度存在差异,但校正后精度提高幅度不能确定,主要取决于样芯年轮的倾斜角度,倾角大的年轮校正效果明显。进一步证明图像分析方法在自动提取年轮宽度的适用性。本方法简便、易行,便于普及,在不具备专业年轮测量仪器或软件时,该方法更具有实际意义。Tree-ring width measurement is the key operation in studies of dendroclimatology, tree growth pattern and forest productivity; its bias magnitude directly affects the final results. Al- though specialized measurement systems or software are reliable tools for dendrochronology and tree growth analysis, it is inconvenient for labs without such devices. The purpose of this study was to develop a tree ring measuring algorithm which is easy to apply while keeping desired accu- racy, especially for labs without the aforementioned conditions. Based on imagery scanned from sample cores, tree ring widths were automatically positioned with an image processor that was commonly used in remote sensing. The extracted widths were corrected with a simple program based on triangle principle for inclined rings. After scanning, the imagery was measured with re- mote sensing software PCI Geomatiea, for which the geocorrection module was used. Results indi- cated that the final values under the high resolution were highly consistent with instrument-meas- ured ones, showing the effectiveness of the method. The method proposed in this paper was sim- ple to operate, convenient for popularization. In addition, it was both time- and cost-effective, especially when specialized instruments were not available.

关 键 词：年轮宽度 自动获取 年轮倾斜校正 图像处理 

分 类 号：S758[农业科学—森林经理学]