Model-Based Integrated Methods for Quantitative Estimation of Soil Salinity from Hyperspectral Remote Sensing Data:A Case Study of Seffected South African Soils

Soil salinization is a land degradation process that leads to reduced agricultural yields. This study investigated the method that can best predict electrical conductivity (EC) in dry soils using individual bands, a normalized difference salinity index (NDSI), partial least squares regression (PLSR), and bagging PLSR. Soil spectral reflectance of dried, ground, and sieved soil samples containing varying amounts of EC was measured using an ASD FieldSpec spectrometer in a darkroom. Predictive models were computed using a training dataset. An independent validation dataset was used to validate the models. The results showed that good predictions could be made based on bagging PLSR using first derivative reflectance (validation R2 = 0.85), PLSR using untransformed reflectance (validation R2 = 0.70), NDSI (validation R2 = 0.65), and the untransformed individual band at 2257 nm (validation R2 = 0.60) predictive models. These suggested the potential of mapping soil salinity using airborne and/or satellite hyperspectral data during dry seasons.     

中国吉林省和韩国野生大豆的遗传多样性及遗传关系分析

利用9对多样性较高的SSR引物分析了来自中国吉林省(36份)和韩国(40份)野生大豆材料的遗传多样性,结果表明:在全部76份材料中,共检测到172个等位基因,每对引物平均获得19.1个.其中,在韩国的野生大豆资源中,每对引物检测到等位基因数11-18个,平均13.7个.中国吉林省的野生大豆资源中,每对引物检测到等位基因数5～16个,平均12.3个.不论中国吉林省还是韩同的野生大豆都具有较高的多态性信息含世(PIC),分别为0.821和0.868,两者遗传多样性并没有明显差异,聚类分析结果表明可将中国吉林省与韩闻的野生大豆分为两大类群.     

Diffuse idiopathic skeletal hyperostosis with prominent appendicular bone proliferation in a dog

This report described radiographic and CT features of atypical diffuse idiopathic skeletal hyperostosis in a 5 year-old, female Shih-tzu showing marked proliferative bone lesions in the appendicular skeleton with minor spinal changes. Continuous or flowing bony bridge formation of vertebrae is used as the gold standard for diagnosing diffuse idiopathic skeletal hyperostosis. However, this criterion seems not to be suitable for appendicular type diffuse idiopathic skeletal hyperostosis, as in the present case. Diffuse idiopathic skeletal hyperostosis is a progressive skeletal disease, and thus, enthesophytosis and the multiple bony proliferations at insertion sites of ligaments and tendons to appendicular bones in a lamellar or trabecular pattern were considered diagnostic features of the appendicular type of diffuse idiopathic skeletal hyperostosis.