叶绿素指数与最大羧化速率相关性研究  

Relationships between Remotely Sensed Chlorophyll Index and Maximum Carboxylation Rate

作　　者：包永康 周艳莲[1] 单良 Bao Yongkang, Zhou Yanlian, Shan Liang(School of Geographic and Oceangraphic Science ,Nanjing University, Nanjing 210023 ,China)

机构地区：[1]南京大学地理与海洋科学学院,江苏南京210023

出　　处：《遥感技术与应用》2018年第2期267-274,共8页Remote Sensing Technology and Application

基　　金：国家重点研发计划项目"陆地生态系统模型与遥感数据同化研究"(2016YFA0600202);国家自然科学基金项目"陆地生态系统净碳交换量遥感估算模型构建"(41371070);"阴叶和阳叶对冠层叶绿素荧光的贡献及其与光合作用关系"(41671343)

摘　　要：以陆地生态系统碳循环机理为基础建立的生态模型是估算区域和全球陆地生态系统GPP时空变化特征的有效手段。叶片最大羧化速率(V_(cmax))是生态系统机理模型中不可或缺的参数,准确模拟V_(cmax)对于GPP模拟具有重要意义,然而,传统方法获取大范围V_(cmax)耗时耗力。利用MERIS遥感数据以及站点实测V_(cmax)数据,分析不同站点3种叶绿素指数,即MCARI、TCARI和MTCI分别与冠层V_(cmax)的关系,以及同一站点不同时间序列MTCI与冠层V_(cmax)的相关性。结果表明:叶绿素指数与冠层V_(cmax)之间相关性显著。其中3种叶绿素指数中,MTCI与冠层V_(cmax)关系最为显著;不同站点,MTCI与冠层V_(cmax)相关性随着植被类型的差异而不同。研究结果为利用遥感数据估算具有时空变化特征的V_(cmax)提供了可能。Process-based ecological models,which simulate carbon exchange at the land-surface,were powerful and indispensable tools for calculating regional and global spatiotemporal variations of terrestrial Gross Primary Productivity（GPP）.Vcmax（maximum carboxylation rate）,one of the most critical parameters in the ecological models,was of significance in accurate calculation of GPP.However,the traditional methods of obtaining Vcmax is time-consuming and laborintensive.In this study,correlations between three types of chlorophyll index（Modified Transformed Chlorophyll Absorption in Reflectance Index,Transformed Chlorophyll Absorption in Reflectance Index,and MERIS Terrestrial Chlorophyll Index）and canopy Vcmax was analyzed for different sites,and correlations between MTCI and canopy Vcmax for different time series of the same site.Results showed there were strong relationships between chlorophyll indices and canopy Vcmax.In the three types of chlorophyll index,the results show the most obvious correlations between MTCI and canopy Vcmax.For different time series of the same site,the relationship varies with different plant type.Results indicated that the remotely sensed chlorophyll index has ability to estimate Vcmax with spatial and temporal variations.

关 键 词：最大羧化速率 MERIS 叶绿素指数 相关性 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]