在二氧化碳地质储存(CCS)过程中,泄露CO2进入土壤,会影响到土壤生物和地表植被,从而影响生态系统稳定性,改变生态系统平衡.植被高光谱遥感是大面积监测CO2地质安全储存的有效方法之一.通过测定CO2泄漏胁迫下马铃薯叶片的高光谱反射率和叶绿素含量,对高光谱数据在400~800nm波长范围内进行光谱计算,得到10个主要光谱特征参数,将其与马铃薯的叶绿素含量变化特征进行相关分析.结果表明,CO2胁迫条件下,叶绿素含量变化与吸收谷底反射率、红边波长和吸收宽度密切相关,与吸收谷底位置、绿峰位置没有确定的数值关系.叶绿素含量与反射光谱特征方程:Y=1769.767X1+0.068X2+12.366X3-2260.315.该研究结果对CCS项目地表生态监测评估、遥感监测CO2泄漏点等都具有重要的现实意义与应用价值.%During the CCS project,the leakage of stored CO2 will enter into the surface soil and then influence soil microbe and land vegetation,which will influence ecosystem's stability and change the ecosystem balance.However,hyper spectral reflectance is one of the most effective methods to monitoring leakage during CCS project.Hyper spectral reflectance and chlorophyll content of potato under CO2 leakage stress were measured.Hyper spectral data in 400~800 nm wavelength range were calculated,and ten spectral parameters were obtained.The physical meaning of above parameters and their correlation with chlorophyll content of potato were analyzed.The results show that under the CO2 stress,chlorophyll content correlation to characteristic parameters which is normalized reflectance at max absorption position,red edge,and absorption width.Chlorophyll content retrieval equation is obtained:Y=1 769.767X1+0.068X2+12.366X3-2 260.315.The result of this paper has very important meaning and application values for CO2 geological storage monitoring and evaluating land-surface ecology under CO2 stress and monitoring the leakage spots by using remote sensing technique.
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