摘要
利用便携式光谱辐射仪测定了温室番茄叶片的光谱反射率,研究了不同施氮水平下特定光谱指数与叶片氮含量、光合速率及产量的关系。结果表明,温室番茄叶片的光谱反射率在可见光波段随供氮水平的升高而降低,在近红外波段随供氮水平的升高而增加。随施氮水平的提高,绿峰的蓝移和红边的红移现象明显,而红谷反射率与光合速率之间的关系可用二次方程拟合,相关系数达0.805。番茄叶片氮含量的敏感光谱波段为580~695 nm,740~900 nm,由695 nm、770 nm两个波段构建的高光谱指数（RVI、NDVI）与叶片氮含量的相关性显著。而基于原始光谱数据对番茄产量的估测也可在温室中得到很好的运用,其中光谱指数RV（I710,680）、VARI700和产量的拟合方程最优。
The spectral reflectance of greenhouse tomato leaves were measured by the ASD Field Spec FR spectrometer at full fruit period. The relationship between spectral indices and leaf nitrogen content, photosynthetic rate and yield at different nitrogen levels were studied. The results indicated that, with the rising of nitrogen supply levels, the spectral reflectance rate of greenhouse tomato leaves decreased in the visible light band, while increasing in the near-infrared band. With the nitrogen application level improved, the phenomenon of Green Peak blue shift and red shift of Red Edge were significantly. A quadratic curve equation could be used for describing the relationship between Red Valley reflectivity and leaf photosynthesis rates, which the correlation coefficient was 0.805. The sensitive bands of leaf nitrogen concentration were 580 - 695 nm and 740 - 900 nm. The correlation between spectral indices （RVI, NDVI）, which were combined by the 695 nm, 770 nm, and leaf nitrogen content was significantly. Using the original spectral data to forecast the tomato yield could also be well used in the greenhouse. The spectral indices, RVI （710, 680）, VARI700 have the optimal fitting equation with the yield.
出处
《土壤通报》
CAS
CSCD
北大核心
2012年第1期141-146,共6页
Chinese Journal of Soil Science
基金
国家重点基础研究发展“973”计划项目(2011CB100501)
国家863计划项目(2011AA100505)
国际合作项目(2010DFA34420)
国际科技合作项目(2010DFB30550)
农田碳氮水关系及高效利用机制研究(BSRF201003)
国家自然科学基金项目(30871447)
关键词
温室番茄
光谱反射率
叶片氮含量
光合速率
产量
Greenhouse tomato
Spectral reflectance rate
Leaf nitrogen content
Photosynthetic rate
Yield
