关键词: 冬麦春播, 穗分化阶段, 生理指标, 籽粒产量, 抗寒性, 主成分分析

Abstract: Film mulch planting is commonly adopted in oasis agriculture in arid zone, and largescale film mulch cultivation may have significant effects on the remote sensing monitoring for NDVI of crop’s early growth. In order to better understand spectral reflectance characteristics of different mulch materials, this study employed black film and transparent film, compared with bare cropland, to illustrate the impact of film mulch planting on NDVI identification in corn’s early growth. The results showed that the spectral reflectance among black film, transparent film and bare cropland existed significant difference (P<0.05). At 325-1035 nm wavelength, the average spectral reflectance of transparent film, bare cropland and black film were 25.9%, 13.9% and 13.7%, respectively. For Landsat and MODIS data, relationship between the mulching area and NDVI was linear in largescale film mulch cultivation area, and the slope of the regression equation of the transparent film was larger than that of the black film. These results indicated that the mulch film planting had significant influence on identifying the corn’s early growth based on NDVI monitoring.

Key words: winter wheat sowing in spring,  , spike differentiation stage, physiological indices, grain yield, cold tolerance, principal component analysis.