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覆膜种植是干旱区绿洲农业普遍采用的方式,大面积覆膜种植对农作物早期NDVI生长状况监测具有较大的影响。本文在张掖绿洲以大面积种植的玉米为测定对象,选择黑膜和透明膜覆盖与裸地种植进行地面反射光谱特征研究,揭示覆膜种植对玉米生长初期NDVI识别的影响。结果表明:黑膜和透明膜与裸地之间的光谱反射率都存在显著差异(P<0.05);在325~1035 nm波段波长范围内,黑膜、透明膜、裸地光谱反射率平均值总体特征为透明膜(25.9%)>裸地(13.9%)>黑膜(13.7%);对使用较多的Landsat和MODIS数据而言,覆膜率与NDVI之间呈线性回归,其中透明膜覆盖率与NDVI的线性趋势回归斜率大于黑膜覆盖度;地膜覆盖种植对玉米早期生长NDVI识别有较大的影响。
Film mulching is a commonly used method of oasis agriculture in arid areas. Large-area mulching has a great influence on the monitoring of early NDVI growth of crops. In this paper, a large area of maize was planted in Zhangye oasis. The characteristics of ground reflectance spectrum were studied by covering black film with transparent film and bare land. The effects of plastic film planting on the NDVI identification of early maize growth were revealed. The results showed that there was a significant difference (P <0.05) in the spectral reflectance between the black film and the bare film and the bare film (P <0.05). In the wavelength range from 325 nm to 1035 nm, the mean value of spectral reflectance The overall characteristics were transparent film (25.9%)> bare land (13.9%)> black membrane (13.7%); for more Landsat and MODIS data, the linear regression was between coating rate and NDVI, Linear regression of coverage and NDVI showed that the regression slope was larger than that of black film. Plastic film mulching had a greater impact on the identification of early NDVI in maize.