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基于高分一號衛(wèi)星數(shù)據(jù)的冬小麥葉片SPAD值遙感估算
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國家高技術(shù)研究發(fā)展計(jì)劃(863計(jì)劃)資助項(xiàng)目(2013AA102401)


Remote Sensing Estimation of SPAD Value for Wheat Leaf Based on GF-1 Data
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    摘要:

    以陜西省關(guān)中地區(qū)冬小麥不同生育期冠層高光譜反射率為數(shù)據(jù)源,模擬國產(chǎn)高分辨率衛(wèi)星高分一號(GF-1)的光譜反射率,提取18種對葉綠素敏感的寬波段光譜指數(shù),構(gòu)建了基于遙感光譜指數(shù)的冬小麥葉片葉綠素相對含量(SPAD)遙感監(jiān)測模型,并利用返青期的GF-1衛(wèi)星數(shù)據(jù)對研究區(qū)的冬小麥葉片SPAD值進(jìn)行了估算和驗(yàn)證。結(jié)果表明:返青期、孕穗期和全生育期SPAD值均與TGI指數(shù)相關(guān)性最高,相關(guān)系數(shù)分別為-0.742、-0.740和-0.483。拔節(jié)期和灌漿期SPAD值分別與SIPI指數(shù)和GNDVI指數(shù)相關(guān)性最高,相關(guān)系數(shù)分別為0.788和0.745。GNDVI、GRVI和TGI植被指數(shù)在各個生育期都和冬小麥葉片SPAD含量在0.01水平下呈顯著相關(guān)?;诖?類植被指數(shù)構(gòu)建的冬小麥葉片SPAD值回歸模型精度較高,其中基于隨機(jī)森林回歸算法的估算模型效果最優(yōu),各類模型均在冬小麥拔節(jié)期的預(yù)測效果最佳。GF-1號衛(wèi)星數(shù)據(jù)結(jié)合SPAD-RFR模型對研究區(qū)冬小麥葉片SPAD的估算結(jié)果最為理想,可用于大面積空間尺度的冬小麥葉片SPAD值遙感監(jiān)測。

    Abstract:

    Region were applied to simulate the satellite spectral reflectance of domestic highresolution satellite GF-1,〖JP〗 and then eighteen broad vegetation indices which were sensitive to the chlorophyll content were obtained based on the simulation reflectance. The relationships between SPAD values and eighteen vegetation indices were analyzed at different growth stages of winter wheat, and the most related vegetation indices were selected to construct the remote sensing monitoring model of SPAD value for leaf by regression analysis. Finally, the models for wheat greenup stage were used to estimate the SPAD value for winter wheat leaf through GF-1 satellite data. The results showed that the SPAD values were highly related with the TGI index in greenup, booting and whole growth periods. The correlation coefficients were -0.742, -0.740 and -0.483, respectively. The SPAD values were significantly related with SIPI and GNDVI indices in jointing and grain filling stage, and the correlation coefficients reached to 0.788 and 0.745, respectively. The GNDVI, GRVI and TGI indices kept a good relationship with leaf SPAD values in each growth period at the 0.01 probability level. All the regression models proposed by GNDVI, GRVI and TGI indices performed well, especially the RandomForest regression model (SPAD-RFR). The best prediction results appeared at the jointing stage of winter wheat. It concluded that SPAD-RFR regression model based on the GF-1 satellite imagery data could effectively monitor the SPAD value for winter wheat leaf in the study area.

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李粉玲,王 力,劉 京,常慶瑞.基于高分一號衛(wèi)星數(shù)據(jù)的冬小麥葉片SPAD值遙感估算[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2015,46(9):273-281. Li Fenling, Wang Li, Liu Jing, Chang Qingrui. Remote Sensing Estimation of SPAD Value for Wheat Leaf Based on GF-1 Data[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(9):273-281.

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  • 收稿日期:2015-05-29
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  • 在線發(fā)布日期: 2015-09-10
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