基于双波段光谱仪CGMD-302的小麦叶面积指数和叶干重监测  

Monitoring leaf area index and leaf dry weight of winter wheat with dual-wavebands spectrometer CGMD-302

作　　者：周晓楠[1] 黄正来[1] 张文静[1] 马尚宇[1] ZHOU Xiaonan;HUANG Zhenglai;ZHANG Wenjing;MA Shangyu(School of Agronomy,Anhui Agricultural University,Hefei 230036,China)

机构地区：[1]安徽农业大学农学院,合肥230036

出　　处：《中国农业大学学报》2017年第1期102-111,共10页Journal of China Agricultural University

基　　金：公益性行业(农业)科研专项(201303109-5);国家"十二五"科技支撑项目(2011BAD16B06;2012BAD04B09;2012BAD14B13)

摘　　要：为探究双波段光谱仪CGMD-302在监测小麦长势上的可靠性与精准性,同时使用高光谱仪UniSpec SC与双波段光谱仪CGMD-302测试各生育时期小麦冠层信息,并定量分析了植被指数NDVI、RVI、DVI与叶面积指数和叶片干重之间的线性关系。结果表明,基于相同波段反射率计算出的高光谱仪植被指数和双波段光谱仪植被指数均能较好监测小麦群体长势。在CGMD-302监测的叶面积指数模型中,拟合方程的决定系数(R^2)均高于0.89,用以检验模型的均方根误差(RMSE)和相对误差(RE)分别小于0.792和0.225;叶片干重模型中,决定系数(R2)均高于0.85,用以检验模型的均方根误差(RMSE)和相对误差(RE)分别小于440kg/hm^2和0.239。通过分析发现,施氮270kg/hm^2既能保证产量又能兼顾品质,可作为适宜施氮量。适宜施氮量下,拔节期和孕穗期小麦适宜叶面积指数分别为:3.65±0.09和5.95±0.32;适宜叶干重分别为:(1 554±168)和(2 231±130)kg/hm^2。结合CGMD-302监测模型可推算出拔节期和孕穗期适宜冠层群体的植被指数区间并应用于冠层群体诊断。In order to examine the reliability and precision of dual-wavebands spectrometer CGMD-302,this study tested wheat canopy morphology by using hyper-spectrometer UniSpec SC and dual-wavebands spectrometer CGMD-302 simultaneously and analyzed linear relationships between vegetation index NDVI,RVI,DVI,and leaf area index（LAI）and leaf dry weight（LDW）quantitatively.Date analyses showed that both vegetation indices from UniSpec SC and CGMD-302 could monitor the growth condition of winter wheat.A linear relationship model was established between vegetation indices by dual-wavebands spectrometer and growth parameter.In the model of vegetation indices and LAI,the determination coefficients（R2）were not less than 0.891,with root mean square error（RMSE）and relative error（RE）not more than 0.792 and 0.225 respectively.In the model of vegetation indices and LDW,the R2 was not less than0.85,with RMSE and RE not more than 440kg/hm^2 and 0.239 respectively.It was found that the nitrogen fertilizer270kg/hm^2 not only guaranteed the yield but also took the quality into account,which can be used as the appropriate amount of nitrogen fertilizer.Under appropriate nitrogen fertilizer,wheat suitable leaf area index at jointing and booting stages were respectively 3.65±0.09 and 5.95±0.32respectively;And the appropriate leaf dry weight were respectively 1 554±168kg/hm^2 and 2 231±130kg/hm^2.With the CGMD-302 monitoring model,suitable vegetation index interval of canopies could be calculated at jointing and booting stages of winter wheat.

关 键 词：冬小麦 叶面积指数 叶片干重 双波段光谱仪 监测模型 

分 类 号：S127[农业科学—农业基础科学]