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.
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.
出处
《土壤》
CAS
CSCD
北大核心
2005年第4期405-409,共5页
Soils
基金
中国科学院知识创新工程重要方向项目(K2CX2-404)
"863"项目(2001AA245013)资助。
关键词
小麦
磷肥
冠层光谱
敏感波段
关键生育期
Wheat, P fertilizer, Canopy spectral reflectance, Sensitive bands, Key developmental stages
