持续受渍对油菜叶片光谱特性的影响

发布时间：2018-03-30 16:03

本文选题：油菜　切入点：渍害　出处：《江苏农业科学》2017年05期

【摘要】：针对目前只能用最终产量诊断油菜是否受渍的现实,基于光谱反射曲线能准确反映作物水分胁迫状况,为实现油菜渍害的快速、无损鉴别,通过田间试验,在油菜蕾薹期和花期,利用光谱仪每隔3 d定期采集油菜华油杂668、中双9号2个品种,在不受渍(CK)和充分受渍(地下水近地表)6、9、12、15、18 d后叶片的光谱反射率数据,分析油菜受渍时间对油菜叶片光谱特性的影响。研究结果表明,在花期持续受渍的21 d内,叶片光谱反射率相比未受渍油菜,在550~700 nm及1 400~1 500 nm区间内升高,在750~950 nm区间内降低;其NDVI、NDWI指数基本随受渍时间的增加而降低。通过光谱曲线的一阶导数提取红边位置后发现,当渍害胁迫超出了油菜机体自我调节阈值时,其叶片反射光谱的红边位置随受渍时间的增加发生蓝移现象,且蓝移幅度随渍水时间增加而增大。通过比较油菜品种华油杂668、中双9号在蕾薹期、花期的红边位置,结果表明油菜品种华油杂668的抗渍能力比中双9号强。建议用NDVI、NDWI指数变化,结合红边位置是否蓝移诊断油菜是否受渍。
[Abstract]:In view of the fact that the final yield can only be used to diagnose whether rape is infested or not, based on the spectral reflection curve, the crop water stress can be accurately reflected. In order to realize the rapid and nondestructive identification of rape waterlogging, the field experiment was carried out.The spectral reflectance data of two rape cultivars, Huayuza 668 and Zhongshuang 9, were collected by spectrometer every 3 days at bolting stage and flowering stage.The effect of soaking time on the spectral characteristics of rape leaves was analyzed.After extracting the red edge position by the first derivative of the spectral curve, it was found that when the waterlogging stress exceeded the self-regulating threshold of rape body, the red edge position of the leaf reflectance spectrum of rape leaves shifted blue with the increase of soaking time.The amplitude of blue shift increases with the increase of waterlogging time.By comparing the red edge position of the rape varieties Huayuza 668 and Zhongshuang 9 in bud bolting and flowering, the results showed that the waterlogging resistance of the rape variety Huayuza 668 was stronger than that of Zhongshuang 9.It is suggested that the NDWI index change and the blue shift of red edge position should be used to diagnose rape stains.
【作者单位】：长江大学农学院;湖北省荆州农业气象试验站;
【基金】：公益性行业(农业)科研专项(编号:201203032) 长江大学校级大学生创新创业训练计划(编号:20150082)
【分类号】：S422;S565.4

【相似文献】