冬小麦冠层光谱与土壤供氮状况相关性研究

发布时间：2018-05-02 16:33

本文选题：冬小麦 + 冠层光谱　；参考：《农业机械学报》2017年05期

【摘要】：通过设置2个冬小麦品种不同氮素水平的完全随机区组试验,获取冬小麦关键生育期(返青期、拔节期、孕穗期、灌浆期)的土壤氮素、植株氮素和冠层光谱数据,通过分析土壤氮素与植株氮素间的相关关系,间接构建土壤氮素状况的光谱诊断模型。结果表明,不同施氮水平冬小麦各生育期冠层光谱与麦田土壤氮素含量差异显著,土壤硝态氮、碱解氮含量与冬小麦植株氮素含量的相关系数达到0.72以上,相关系数分别在0.72~0.84和0.75~0.82之间,均达极显著水平,而土壤全氮含量与冬小麦植株含氮量的相关性相对较差;研究证实土壤调节植被指数SAVI(1040,680)和比值植被指数RVI(1040,680)分别与土壤硝态氮、碱解氮含量具有重要的关系。另外,基于光谱参数SAVI(1040,680)的土壤硝态氮估算模型(R~2≥0.739 6)和基于RVI(1040,680)所构建的碱解氮含量估算模型(R~2≥0.810 0)具有较好的估测能力,可以实现利用冠层光谱对土壤氮素状况的实时、快速估测。
[Abstract]:Soil nitrogen, plant nitrogen and canopy spectral data were obtained from 2 Winter Wheat Varieties with different nitrogen levels and nitrogen levels in the critical growth period of Winter Wheat (green period, jointing stage, booting stage and filling stage). By analyzing the relationship between nitrogen and plant nitrogen, the spectral diagnosis of soil nitrogen status was indirectly constructed. The results showed that the canopy spectrum of winter wheat at different growth stages and nitrogen content in wheat field were significantly different. The correlation coefficient of soil nitrate nitrogen, alkaline nitrogen content and winter wheat nitrogen content reached more than 0.72, and the correlation coefficients were between 0.72~0.84 and 0.75~ 0.82, respectively, and the total nitrogen content of soil was reached. The correlation of the nitrogen content of winter wheat was relatively poor; the study confirmed that the soil regulated vegetation index SAVI (1040680) and the ratio vegetation index RVI (1040680) had an important relationship with soil nitrate nitrogen and alkaline nitrogen content respectively. In addition, the estimation model of soil nitrate nitrogen based on spectral parameters SAVI (1040680) and RVI (1040) (1040) 680) the estimation model of alkali hydrolysable nitrogen content (R~2 > 0.8100) has a good estimation ability. It can be used to realize the real-time and rapid estimation of soil nitrogen using canopy spectrum.

【作者单位】：山西农业大学农学院;山西省农业科学院作物科学研究所;
【基金】：国家自然科学基金项目(31371572、31201168)
【分类号】：S158;S512.11

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