结合放射线法和无人机影像提取冠幅估算杉木碳储量研究  

Study on Carbon Storage Estimation of Cunninghamia lanceolata in Longquan

作　　者：王杰芬 夏磊 林露花 胡璐璐 徐怀兴 王聚中 徐小军[2] WANG Jiefen;XIA Lei;LIN Luhua;HU Lulu;XU Huaixing;WANG Juzhong;XU Xiaojun

机构地区：[1]浙江省龙泉市林业局,浙江龙泉323700 [2]浙江农林大学环境与资源学院,浙江杭州311300

出　　处：《浙江林业科技》2023年第5期42-50,共9页Journal of Zhejiang Forestry Science and Technology

基　　金：地方与高校合作项目(H20220013)资助。

摘　　要：分别以树龄18年和27年的杉木Cunninghamia lanceolata纯林为研究对象,利用大疆M300无人机获取样地1和样地2可见光影像,结合放射线法提取两个样地内378株杉木单木冠幅并与实测冠幅作精度分析,根据实测冠幅、胸径和树高,分别建立冠幅-胸径以及胸径-树高回归模型,并将提取冠幅代入冠幅-胸径回归模型得到胸径估计值,将胸径估计值代入胸径-树高回归模型得到树高估计值,最后将单木胸径和树高估计值代入杉木碳储量相对生长方程,估计杉木单木和样地碳储量。结果表明,杉木胸径与树高符合线性函数关系,两者决定系数R^(2)在0.89以上,胸径和冠幅符合线性关系,样地1和样地2的R^(2)分别为0.55和0.61;基于无人机提取的单木冠幅精度在71.55%以上,基于提取冠幅得到的杉木单木胸径和树高估计值精度分别为78.24%和79.80%以上;样地1和样地2杉木单木碳储量估计值分别在3.92~35.49 kg之间和15.07~53.72 kg之间,两个样地的精度分别为46.00%和54.60%,对于样地尺度,样地1和样地2杉木碳储量估计值分别为63.98 t·hm^(-2)和45.23 t·hm^(-2),采用本文方法得到的样地杉木平均冠幅、胸径、树高和碳储量估计精度均在89.77%以上。利用无人机影像冠幅信息可准确估计出样地碳储量,为智能、快速、准确获取杉木林分碳储量提供了一种可行的技术。In February 2022,2 pure 18-year and 27-year Cunninghamina lanceolata plantations in Longquan city,Zhejiang province were selected for establishment of 9 sample plots each.Determinations were carried out on crown width,DBH and height of each tree in 18 sample plots.The crown width of 378 C.lanceolata trees were extracted by visible light images from Dajiang M300 UAV and accuracy analyzed with the measured one by local transect method.According to the measured crown width,DBH and tree height,the regression models of crown width and DBH and of DBH and tree height were established.The extracted crown width is used to estimate the DBH based on regression model of crown width and DBH,and the DBH estimates are used to estimate the tree height based on regression model of DBH and tree height.The individual tree DBH and tree height estimates are input into the relative growth equation of carbon storage to estimate the carbon storage of individual tree and stand.The result showed that the relationship between DBH and tree height was linear function,and the coefficient of determination(R^(2))is over 0.89.The relationship between DBH and crown width was linear,and R^(2) were 0.55 and 0.61 for different plantation.The accuracy of individual tree crown width extracted from UAV images was more than 71.55%,and the accuracy of individual tree DBH and tree height estimates based on extracted crown width were more than 78.24% and 79.80%.Carbon storage estimates of individual tree for 2 plantations ranged from 3.92 kg to 35.49 kg and from 15.07 kg to 53.72 kg,with accuracies of 46% and 54.60%.Carbon storage estimates were 63.98 t/ha and 45.23 t/ha of two plantations.

关 键 词：冠幅 碳储量 无人机 放射线法 

分 类 号：S758.5[农业科学—森林经理学]