Prediction of soil depth using environmental variables in an anthropogenic landscape, a case study in the Western Ghats of Kerala, India   总被引：4，自引：0，他引：4  

Sekhar L. Kuriakose  Sanjaya Devkota  D.G. Rossiter  V.G. Jetten 《CATENA》2009,79(1):27-38

Soil (regolith) depth is a crucial input for modeling earth surface phenomena. However, most studies ignore its spatial variability. Techniques that map the spatial variability of soil depth are of three types: (1) physically-based; (2) empirico-statistical from environmental correlates; and (3) interpolation from point observations. In an anthropogenic landscape, soil depth does not depend primarily on natural processes, making it difficult to apply a physically-based approach. The present study compares empirico-statistical methods with geostatistical methods for predicting soil depth in such a landscape: Aruvikkal catchment (9.5 km²) in the Western Ghats of Kerala, India. Regression kriging applied on blocks of 20 m by 20 m using the environmental covariates elevation, slope, aspect, curvature, wetness index, land use and distance from streams, proved to be the best predictor of soil depth. This model explains 52% of the variability of soil depth in the catchment; with a prediction variance of 0.05 to 0.19. A Gaussian simulation was attempted for a more realistic visualization of the depth, as opposed to the smooth kriging prediction. The most important explanatory variable of soil depth in this landscape is land use, as expected from the strong human intervention.  相似文献   

Detection of avian influenza viruses and differentiation of H5, H7, N1, and N2 subtypes using a multiplex microsphere assay     

Kuriakose T  Hilt DA  Jackwood MW 《Avian diseases》2012,56(1):90-96

  相似文献   

Vibrio alginolyticus infection in Asian seabass (Lates calcarifer,Bloch) reared in open sea floating cages in India     

Sulumane Ramachandra Krupesha Sharma  Gaurav Rathore  Dev K Verma  Narasimhulu Sadhu  Kuttickal Kuriakose Philipose 《Aquaculture Research》2012,44(1):86-92

Asian seabass (Lates calcarifer) has been designated as a candidate species for open sea cage culture in India. A case of vibriosis in Asian seabass reared in open sea floating cages is reported. Haemorrhage and ulcer were observed grossly in the diseased fish. The pathogen, identified as Vibrio alginolyticus based on biochemical and molecular characterization, was isolated from liver, gill, kidney, brain and blood. Histological examination of the diseased fish showed congestion, haemorrhage and necrosis in vital organs. The LD₅₀ studies showed that the organism was virulent to Asian seabass, and the LD₅₀ value was 10^3.2 CFU g^?1 fish.  相似文献   

Chronic stress due to high stocking density in open sea cage farming induces variation in biochemical and immunological functions in Asian seabass (Lates calcarifer,Bloch)   总被引：1，自引：0，他引：1  

Narasimhulu Sadhu  S. R. Krupesha Sharma  Shoji Joseph  Praveen Dube  K. K. Philipose 《Fish physiology and biochemistry》2014,40(4):1105-1113

Stocking density is an important factor in cage aquaculture of finfish. Effects of high stocking density (35 fish cubic m^?1) on a range of biochemical and immunological parameters in Asian seabass reared in open sea floating net cages were compared to fish held in relatively low density (15 fish cubic m^?1). The results revealed that chronic stress due to high stocking density induced variations in most of the parameters studied as evidenced by increased cortisol and glucose levels and decreased activity of lysozyme, myeloperoxidase and complement. Production of reactive oxygen species, total leucocyte count and total serum protein were also decreased, whereas anti-protease, alkaline phosphatase and acid phosphatase activities were increased in high stocking-density group when compared to low stocking-density group. Effects of chronic stress due to high stocking density were discussed in relation to variations in these parameters.  相似文献