顾及光谱位置及秸秆还田活动影响的土壤有机质高光谱估算  

Hyperspectral estimation of soil organic matter considering spectral position and the effect of straw-returning activities

作　　者：谭超 林镇宏 贺秋华 栾海军 余姝辰 郑雅玲 邹娟 TAN Chao;LIN Zhenhong;HE Qiuhua;LUAN Haijun;YU Shuchen;ZHENG Yaling;ZOU Juan(School of Computer and Information Engineering,Xiamen University of Technology,Xiamen 361024,China;Hunan Key Laboratory of Remote Sensing Monitoring of Ecological Environment in Dongting Lake Area,Hunan Provincial Center of Natural Resources Affairs,Changsha 410004,China)

机构地区：[1]厦门理工学院计算机与信息工程学院,福建厦门361024 [2]湖南省自然资源事务中心洞庭湖区生态环境遥感监测湖南省重点实验室,湖南长沙410004

出　　处：《测绘通报》2025年第2期89-95,共7页Bulletin of Surveying and Mapping

基　　金：福建省自然科学基金(2023J011429,2023J011425);洞庭湖区生态环境遥感监测湖南省重点实验室开放课题(DTH Key Lab.2023.05);湖南省自然资源科技计划项目(20230151ST,20230142ST)。

摘　　要：土壤有机质(SOM)是衡量土壤健康和肥力的重要指标,准确估算SOM对农业可持续发展至关重要。高光谱技术结合机器学习为SOM的大范围且无损监测提供了可能。然而,现有研究尚未充分探讨土壤活性物质作用的敏感光谱范围内光谱位置的物理意义及农业秸秆还田活动的光谱效应。因此,本文提出了创新的Pearson相关系数与光谱位置联合优化算法(PAS),以解决这个问题。试验结果表明:PAS算法中,光谱位置与相关系数的比例为3∶7时,可有效提升模型预测性能;1260 nm特征波长是秸秆有机成分的光谱效应典型位点;1300 nm特征波长为1260 nm与SOM的相互作用典型位点;1320 nm特征波长受1260 nm、SOM及1340 nm的综合影响。本文论证了秸秆还田活动的光谱效应对SOM估算的重要影响,以及文中方法量化秸秆还田活动固碳效应的潜力。Soil organic matter(SOM)is an important soil health and fertility indicator.Accurate estimation of SOM is crucial for sustainable agricultural development.Hyperspectral technology combined with machine learning provides the possibility for large-scale and non-destructive monitoring of SOM.However,existing studies have not fully explored the physical significance of spectral positions within the sensitive spectral range of soil active materials and the spectral effects of agricultural straw return activities.Therefore,this study proposed an innovative Pearson correlation coefficient and spectral position joint optimization algorithm(PAS)to solve this problem.The experimental results show that:In the PAS algorithm,the spectral position to correlation coefficient ratio is 3∶7,which can effectively improve the model performance.The characteristic bands near 1260 nm are a typical site of straw organic components.The characteristic bands near 1300 nm are a typical site of interaction between 1260 nm and SOM.The characteristic bands near 1320 nm are affected by 1260 nm,SOM,and 1340 nm.This study demonstrates the important influence of the spectral effect of agricultural straw return activities on SOM estimation and the approach in this study to potentially quantify the carbon sequestration effect of straw return activities.

关 键 词：土壤有机质 高光谱 土壤活性物质 秸秆还田 地理加权回归 土壤固碳 

分 类 号：P237[天文地球—摄影测量与遥感]