| 不同磷肥水平的小麦冠层多光谱特征研究 |
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| 引用本文： | 任红艳,潘剑君,张佳宝.不同磷肥水平的小麦冠层多光谱特征研究[J].土壤,2005,37(4):405-409. |
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| 作者姓名： | 任红艳 潘剑君 张佳宝 |
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| 作者单位： | 1. 南京农业大学资源与环境学院,南京,210095
2. 中国科学院南京土壤研究所,南京,210008 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目（K2CX2-404）和“863”项目（2001AA245013）资助. |
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| 摘 要： | 利用便携式冠层光谱仪对小麦进行连续观测获取光谱数据。本文分析了小麦在不同P肥施用水平及生育期变化情况下冠层的光谱响应特征,运用t-检验等统计方法获得了小麦冠层光谱对不同P肥水平的敏感波段,并由此找到判断P肥施用是否合理的关键生育期。结果表明小麦冠层光谱的近红外波段(810~1100nm)对P素的相应关系优于可见光波段,870nm等近红外波段为小麦P素敏感波段;从拔节期到孕穗期前后为其P素丰缺状况光谱诊断的关键生育期;归一化植被指数(NDVI)也可与小麦产量建立很好的回归方程。
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| 关 键 词： | 小麦 磷肥 冠层光谱 敏感波段 关键生育期 |
SPECTRAL REFLECTANCE CHARACTERISTICS OF WHEAT DIFFERENT IN PHOSPHORUS FERTILIZER APPLICATION RATE |
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| REN Hong-yan,PAN Jian-jun and ZHANG Jia-bao.SPECTRAL REFLECTANCE CHARACTERISTICS OF WHEAT DIFFERENT IN PHOSPHORUS FERTILIZER APPLICATION RATE[J].Soils,2005,37(4):405-409. |
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| Authors: | REN Hong-yan PAN Jian-jun and ZHANG Jia-bao |
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| Institution: | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095,College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 and Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 |
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| Abstract: | With a mobile spectral radiometer, spectral reflectance of wheat canopy was observed continuously. And analysis was done of spectral response from the canopy of wheat variant in P fertilization rate at various developmental stages and relationship between spectral reflectance and wheat yield. Statistic technologies such as T-test were used to search for sensitive bands of wheat canopy reflectance responding to different P fertilization levels and hence a key developmental stage for determining whether or not P fertilization is reasonable. The results show that NIR (810 ~ 1100 nm) exhibited much better ability to differentiate variant P fertilizer levels than VIS, especially during the stage from jointing to booting, so that NIR (810, 870, 950 and 1100 nm) could be defined as sensitive bands to P nutrition of wheat and the stage from jointing to booting could be determined to be the key developmental stage to diagnose wheat P nutrition by means of canopy reflectance. Thus a good regression equation can be built up between NDVI and wheat yield. |
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| Keywords: | Wheat P fertilizer Canopy spectral reflectance Sensitive bands Key developmental stages |
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