摘要
本研究用光谱反射率直接建立 ND 指标与群体光合能力的关系。试验发现,ND 指标与小麦群体光合能力有极好的正相关性(r>r_(0.1)),ND 值随群体光合能力增加而增加;但 ND 值与叶面积指数之间相关不显著(-0.14<r<0.37)。因此表明 ND 值用于分析群体光合作用与叶面积系数所指的群体状况有所不同。通过本文还可以看出,ND 值随小麦生育期向后推移呈抛物线型,并且随小麦产量水平的提高 ND 值变大。由此可预示在研究小麦群体结构中,利用 MSS 光谱反射率反映群体光合效率比叶面积指数反映群体结构有更好的效果。
This study was carried out to relate directly the ND index of spec- tral reflectivity to crop canopy photosynthetic activity in winter wheat. It was found that,ND index was highly and positively correlated with the canopy photosynthesis,i.e.,ND value increased with the increase of canopy photosynthetic activity (r>0.01);whilst there was no significant correlation between ND index and LAI (—0.14<r<0.37). Therefore,it appears that ND value could be used as an indicator of canopy photosynthesfs,different from that revealed by LAI.Moreover it was shown that the ND value changed parabolieally with the pro- gess of wheat growth,and increased with the increase of yield.As a result,in the study of wheat population structure,it would be superior to indicate the canopy photosynthtic efficiency by MSS spectral reflec- tivity over to show the canopy structure by LAI.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
1989年第2期84-88,共5页
Journal of Hebei Agricultural University
关键词
小麦
光谱反射率
群体结构
Wheat
Spectral reflectivity
Canopy photosynthesis
LAI
