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林草资源研究 ›› 2026›› Issue (2): 102-114.doi: 10.13466/j.cnki.lczyyj.2026.02.010

• 技术方法 • 上一篇    下一篇

基于星载激光雷达与光学遥感数据的龙竹地上生物量反演

王明星1(), 舒清态1(), 夏翠芬1, 吴再昆1, 周赛1, 段丹丹2, 李圣娇3   

  1. 1 西南林业大学 林学院, 昆明 650224
    2 北京市农林科学院信息技术研究中心, 北京 100097
    3 滇西应用技术大学 测绘与信息工程学院, 云南 大理 671000
  • 收稿日期:2024-10-23 修回日期:2025-09-30 出版日期:2026-04-28 发布日期:2026-09-30
  • 通讯作者: 舒清态,教授,主要研究方向为林业3S技术与应用。Email:shuqt@163.com
  • 作者简介:王明星,硕士研究生,主要研究方向为林业遥感。Email:wmxing7@163.com
  • 基金资助:
    “十四五”国家重点研发计划“竹资源多尺度精准高效监测技术”(2023YFD2201205);地方高校联合专项-青年项目“基于机载LiDAR协同高光谱数据的树种精细分类”(202101BA070001-015)

Inversion of aboveground biomass of Dendrocalamus giganteus by using spaceborne LiDAR and optical remote sensing data

WANG Mingxing1(), SHU Qingtai1(), XIA Cuifen1, WU Zaikun1, ZHOU Sai1, DUAN Dandan2, LI Shengjiao3   

  1. 1 College of Forestry, Southwest Forestry University, Kunming 650224, China
    2 Information Technology Research Center, Information Technology Research Center,Academy of Agriculture and Forestry Sciences, Beijing 100097, China
    3 School of Surveying, Mapping and Information Engineering,Western Yunnan University of Applied Technology, Dali 671000,Yunnan, China
  • Received:2024-10-23 Revised:2025-09-30 Online:2026-04-28 Published:2026-09-30

摘要:

探究全球生态系统动力学调查多波束激光雷达数据(简称GEDI数据)与哨兵2号光学遥感数据(简称Sentinel-2数据)联合估测竹林地上生物量的潜力,对评估森林生态系统状态具有重要作用。以云南省玉溪市新平彝族傣族自治县(简称新平县)为研究区,以GEDI数据及Sentinel-2数据为主要信息源,提取GEDI数据的51 661个光斑参数,使用克里金插值法获取连续的、完整的地表信息,并结合Sentinel-2数据以及52块样地数据,使用随机森林(RF)以及梯度提升回归树(GBRT)2种模型,对新平县龙竹生物量进行估算,结果表明:1)GEDI L2B级数据提供的modis_treecover、landsat_treecover、digital_elevation_mode、modis_nonvegetated这4个参数以及Sentinel-2 Level-2A级反射率影像计算的DVI、ARVI、RVI、NDVI这4个植被指数与龙竹地上生物量具有较高的相关性,可用于估测县域尺度龙竹地上生物量;2)单一信息源建模时,GBRT模型表现优于RF模型,使用单一Sentinel-2数据时,GBRT估测精度中的决策系数(R2)为0.84、均方根误差(RMSE)为11.00 t/hm2,RF精度中R2为0.74、RMSE为14.17 t/hm2,采用单一GEDI数据时,GBRT的估测精度中R2为0.92、RMSE为7.77 t/hm2,RF的精度中R2为0.87、RMSE为9.95 t/hm2;3)结合GEDI数据及Sentinel-2数据时,GBRT的预测精度较高(R2为0.93,RMSE为7.47 t/hm2),而RF的预测精度略低(R2为0.88,RMSE为9.60 t/hm2);4)综合GEDI数据和Sentinel-2数据的评价结果,估算出新平县龙竹生物量为1.45×107 t,平均生物量为61.91 t/hm2。研究结果表明,结合GEDI数据和Sentinel-2数据估算新平县龙竹生物量,可为多数据整合的县域多源遥感反演提供参考。

关键词: GEDI, Sentinel-2, 机器学习, 地上生物量, 龙竹

Abstract:

Investigating the potential of combining Global Ecosystem Dynamics Investigation(GEDI)multi-beam LiDAR data(referred to as GEDI data)with Sentinel-2 optical remote sensing data(referred to as Sentinel-2 data)for estimating aboveground biomass in bamboo forests plays a crucial role in assessing the state of forest ecosystems.This estimation is essential for evaluating the condition of forest ecosystems.With Xinping Yi and Dai Autonomous County,Yuxi City,Yunnan Province as the research area and by utilizing GEDI data alongside Sentinel-2 data as primary information sources,a total of 51 661 point parameters were extracted from the GEDI data.Utilizing Kriging interpolation,continuous and comprehensive surface information was generated.In conjunction with Sentinel-2 data and 52 sample images,two modeling techniques,involving Random Forest(RF)and Gradient Boosting Regression Trees(GBRT),were employed to estimate the biomass of Dendrocalamus giganteus in Xinping County.The results indicated that:1)The four parameters provided by GEDI L2B data,namely modis_treecover,landsat_treecover,digital_elevation_mode,and modis_nonvegetated,along with the four vegetation indices calculated from Sentinel-2 Level-2A surface reflectance imagery,including DVI,ARVI,RVI,and NDVI,exhibited a high correlation with the above-ground biomass of Dendrocalamus giganteus.They can be used to estimate the above-ground biomass of Dendrocalamus giganteus at the county scale.2)In single-source modeling scenarios,GBRT demonstrates superior performance compared to RF:With exclusive use of Sentinel-2 data vegetation indices,GBRT achieves estimation accuracy metrics of the coefficient of determination with R2 of 0.84 and the root mean square error(RMSE)of 11.00 t/hm2,whereas RF yields R2 is 0.74 and RMSE is 14.17 t/hm2.This performance trend persists when utilizing GEDI data parameters,where GBRT attains R2 of 0.92 and RMSE of 7.77 t/hm2,contrasting with RF’s results of R2 of 0.87 and RMSE of 9.95 t/hm2.3)When combining GEDI data parameters and vegetation indices,GBRT achieves higher predictive accuracy with R2 of 0.93 and RMSE of 7.47 t/hm2,whereas RF shows slightly lower accuracy with R2 of 0.88 and RMSE of 9.60 t/hm2.4)Based on the evaluation results of GEDI data and Sentinel-2 data,the biomass of Dendrocalamus giganteus,Xinping County is estimated to be 1.45×107 t,with an average biomass of 61.91 t/hm2.This demonstrates that combining GEDI data and Sentinel-2 data optical remote sensing to estimate the biomass of Dendrocalamus giganteus,Xinping County would provide a reference for multi-source remote sensing inversion in county-level data integration.

Key words: Global Ecosystem Dynamics Investigation(GEDI), Sentinel-2, machine learning, aboveground biomass, Dendrocalamus giganteus

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