作物学报 ›› 2019, Vol. 45 ›› Issue (8): 1238-1249.doi: 10.3724/SP.J.1006.2019.81084
WU Ya-Peng,HE Li,WANG Yang-Yang,LIU Bei-Cheng,WANG Yong-Hua,GUO Tian-Cai,FENG Wei()
摘要:
利用遥感技术实时监测小麦生长状况, 依据监测结果适时促控, 可提高产量。本研究以高产小麦品种周麦27为试验材料, 在不同试验地点设置了水氮耦合的大田试验, 筛选出了适宜监测冬小麦地上部氮积累量和生物量的植被指数, 并构建了不同产量水平下优选植被指数的动态模型。结果表明, (1)不同的水氮耦合模式显著影响小麦冠层光谱变化, 在350~700 nm和750~900 nm表现相反的反应特征; (2)对2个农学生长指标反应敏感且兼容性好的植被指数主要有修正型红边比率(mRER)、土壤调整植被指数[SAVI (825, 735)]、红边叶绿素指数(CIred-edge)和归一化差异光谱指数(NDSI), 其与产量间相关性较好的时期为拔节至灌浆中期; (3)双Logistic模型可以很好地拟合植被指数的动态变化, 高产和超高产水平下拟合精度较高(R 2 > 0.82), 而低产水平下相对较低(R 2 = 0.608~0.736)。比较而言, CIred-edge和SAVI (825, 735)用于评价小麦长势较为适宜。研究结果对作物因地定产、以苗管理、分类促控具有重要意义。
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