基于GIS的梭梭年轮测量方法

年轮信息对重建气候和预测环境的动态变化有重要意义。为准确测量梭梭年轮间距等各项参数,研究基于GIS对扫描后的梭梭圆盘PS图像赋予坐标系统,通过ENVI图像分类软件结合GIS测量工具,完成梭梭年轮间距测量;利用WinDENDRO年轮分析系统验证测量结果的准确性。结果表明: 两种方法测量结果差异不显著(P=0.63),配对平均值差值为0.87 μm,测量结果准确可信。研究构建的方法可以用于梭梭年轮间距测量,并为面积、周长等年轮参数的自动化测量奠定了基础。该方法也可替代现有专业树木年轮分析系统用于部分年轮参数测量。研究结果有助于梭梭树轮气候学分析和种群年龄结构调查。

GIS-based measurement of Haloxylon ammodendron tree ring

Tree ring data is of significance for reconstructing climate and predicting environmental dynamics. In order to accurately measure spacing and other parameters of Haloxylon ammodendron tree ring, we first assigned coordinate system to the scanned H. ammodendron disc PS images based on GIS, and then completed the H. ammodendron tree ring spacing measurement by using ENVI image classification software and GIS measuring tool. The measurement accuracy was proved by WinDENDRO tree ring analysis system. The results showed that there was no significant difference between those two methods (P=0.63), and that the difference of paired mean value was 0.87 μm, indicating that the measured results were accurate and reliable. The constructed method in this study could be used to measure the spacing of H. ammodendron tree ring, which lay the foundation for the automatic measurement of tree ring parameters such as area and perimeter. Our method could replace the current professional tree ring analysis system for some ring parameter measurement. The study would contribute to the dendroclimatology analysis and the investigation on age structure of H. ammodendron population.