...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Sensor Letters: A Journal Dedicated to all Aspects of Sensors in Science, Engineering, and Medicine >Detection of Corn Chlorophyll Content Using Canopy Spectral Reflectance
【24h】

Detection of Corn Chlorophyll Content Using Canopy Spectral Reflectance

机译：冠层光谱反射检测玉米叶绿素含量

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The canopy spectral reflectance and chlorophyll content of corn were measured and analyzed under different nitrogen treatments. The characteristics of canopy spectral reflectance were described at different stages. Investigation of canopy reflectance under the different nitrogen treatment showed that R_(Normal) > R_(Low) > R_(High) shooting stage. At trumpet stage, the canopy reflectance in low fertilizing region was higher than others were in the visible region and the corn canopy reflectance of normal fertilizing region was same as high fertilizing region. It was obvious that the over-fertilizer could not help to increase the corn nitrogen uptake. The correlation between spectral reflectance and chlorophyll content was discussed based on different growth stages and different nitrogen levels. The results showed the relation under normal nitrogen treatment was better than others were, r_(Normal) > r_(High) > r_(Low). Analysis of the relations at different growth stages showed on the band of 400～1000 nm the absolute value of correlation coefficient increased and reached the maximum at shooting stage, it decreased until anthesis-silking stage, and then rebounded at milking stage. The positive correlations were found at shooting and milking stage, while negative correlations were found at tilling, trumpet and anthesis-silking stage. It was indicated that the sensitive stages to detect the chlorophyll content were shooting and trumpet stage which with high absolute value of correlation coefficient above 0.6 around 550 nm. In order to detect the chlorophyll content of corn, 558 nm, 667 nm, 714 nm and 912 nm were selected to establish the MLR model and PLSR model. The results showed that PLSR was more capable of building chlorophyll content models reflecting correct relations among multi-variables compared with MLR. In the meanwhile, 558 nm, 667 nm and 714 nm were selected to build different vegetation indices such as GDVI, GRVI, NDCI, DVI, RVI and NDVI. The correlation coefficient between DVI and chlorophyll content was higher than others were and DVI was used to establish binomial model and exponential model at shooting stage (r~2 = 0.80) and trumpet stage (r~2 = 0.66) respectively which were higher than PLSR. It also provided a feasible method to detect chlorophyll content non-destructively.
机译：在不同的氮处理下，测量并分析了玉米冠层光谱反射率和叶绿素含量。在不同阶段描述了冠层光谱反射率的特征。不同氮处理条件下的冠层反射率研究表明，R_（正常）> R_（低）> R_（高）射击阶段。在喇叭口阶段，低施肥区的冠层反射率高于可见区，正常施肥区的玉米冠层反射率与高施肥区相同。显然，过量施肥不能帮助增加玉米氮的吸收。根据不同的生长阶段和不同的氮水平，讨论了光谱反射率与叶绿素含量之间的关系。结果表明，在正常氮处理下，r_（正常）> r_（高）> r_（低）的关系更好。分析不同生长阶段的关系，结果表明，在400〜1000 nm波段，相关系数的绝对值在射击阶段达到最大值并达到最大值，直到花粉生长期才下降，然后在挤奶阶段反弹。在射击和挤奶阶段发现正相关，而在耕作，喇叭和花粉生长期发现负相关。结果表明，检测叶绿素含量的敏感阶段是射击阶段和喇叭阶段，在550 nm附近具有较高的相关系数绝对值大于0.6。为了检测玉米叶绿素含量，选择了558 nm，667 nm，714 nm和912 nm建立MLR模型和PLSR模型。结果显示，与MLR相比，PLSR更能建立反映多变量之间正确关系的叶绿素含量模型。同时，选择了558 nm，667 nm和714 nm来建立不同的植被指数，例如GDVI，GRVI，NDCI，DVI，RVI和NDVI。 DVI与叶绿素含量之间的相关系数高于其他指标，并且DVI被用于建立射击阶段的二项式模型和指数模型（r〜2 = 0.80）和小号阶段（r〜2 = 0.66），均高于PLSR。 。这也提供了一种无损检测叶绿素含量的可行方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号