Organic Carbon and Total Iron Effect on Soil Vis-SWNIR Spectraand Quantification of Their Contents Using PLS R Models     

H. Aïchi  Y. Fouad  D. Causeur  C. Walter 《Communications in Soil Science and Plant Analysis》2020,51(9):1253-1267

ABSTRACT

Many factors could influence simultaneously soil spectra. We aimed to study the single effect of organic carbon and total iron in soil visible and short-wave near-infrared spectra and to quantify their contents. Two datasets of soil mixture samples were prepared by mixing, in various fractions, an organic carbon-rich material with a total iron-rich material and then with a total iron-poor material. For these two datasets, contents in organic carbon are quite similar but contents in total iron are significantly different. Results show that samples of the same dataset have the same overall spectral shape. Organic carbon has a decreasing effect that affects the whole spectral range without showing any specific absorption peaks. By contrast, total iron has specific absorption peaks. Spectra of the second dataset characterized by soil mixtures with higher total iron contents were more compact within the spectral bands 400–440 and 920–950 nm. Besides, continuum removal enables to exaggerate absorption peaks of wavelengths linked to total iron content. Partial Least Squares Regression (PLS R) models of both total organic carbon and total iron assign high coefficients to the wavelengths that are considered relevant and conversely low coefficients to those that are considered irrelevant. Both organic carbon content and total iron content were well predicted. For these models, coefficients of determination were superior to 0.9 and RMSE was closed to zero. The global models calibrated on all the samples demonstrated that PLS R was able to integrate sample heterogeneity.  相似文献   

The Veterinarian's Companion for Common Dental Procedures          下载免费PDF全文

Loïc Legendre 《The Canadian veterinary journal. La revue veterinaire canadienne》2001,42(6):470

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Die AbschÄtzung der schwedischen WÄlder und ihre Bedeutung für den internationalen Holzhandel     

Professor Dr. oec. publ. h. c. Henrik Hesselman 《European Journal of Forest Research》1928,50(12):395-403

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Pathologic changes in the lungs of deer spontaneously infected with nematodes from the Protostrongylidae family]     

P Rezác  K Blazek 《Veterinární medicína》1991,36(5):315-320

Lungs of 30 animals of the red deer (Cervus elaphus hippelaphus) attacked by parasitic helminths were submitted to a histological examination, and the changes which were caused by the nematodes of Protostrongylidae family were estimated. The lungworm Varestrongylus sagittatus (Mueller, 1891) creates hatching tubercles of a dark-red or yellow-green and even ochre colour. The lobular catarrhal bronchopneumonia is a histological correlate. In hatching tubercles there are located adult nematodes, ova of 46 x 27 microns and larvae of the 1st stage. For the infection of the Elaphostrongylus cervi nematodes (Cameron, 1931), the typical changes are those of the character of disseminated interstitial pneumonia. In the pulmonary tissue affected in such a way, there are numerous haemorrhages often visible microscopically. In the capillaries of interalveolar septa there are ova of E. cervi that reach up to 83 microns in dependence on the degree of their development and in alveoli there are larvae of the 1st stage. Adults do not occur in lungs.  相似文献   

Bovine Hematology1     

R. J. Lorenz  O. c. Straub  W. J. C. Donelly  J. c. Flensburg  G. Gentile  M. Mammerickx  L. M. Markson  A. A. Ressang  S. M. Taylor 《Zoonoses and public health》1978,25(3):245-256

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Retropneumoperitoneal Visualization of Abdominal Organs in Domestic Animals1     

Borislav E&#x;kov  Branislav Petrovi&#x;c  Borislav Dragnovi&#x; 《Veterinary radiology & ultrasound》1976,17(1):23-31

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Serum selenium levels in sheep from birth to 90 days of age]     

M Prosbová  G Kovác  L Vrzgula 《Veterinární medicína》1979,24(6):331-336

The results of the study of the dynamics of selenium in the blood serum were compared in 31 piglets from birth to the age of 90 days. The analyzed selenium values in the blood serum immediately after birth (0.14--0.20 ppm) provide evidence of the intra-uterine placental passage of selenium. In the period of colostral and milk nutrition, the serum concentrations of selenium showed a statistically insignificant variation, followed by an abrupt drop of the level of the microelement in the weaning period (60th day). The individual values in this period ranged from 0.08 to 0.12 ppm. Towards the end of the study, the level of selenium in the blood serum of the piglets returned to its initial value; this indicates that although the critical period connected with weaning has a transient nature, it should be averted for preventing the occurrence of a selenium-deficit disease; this can be done by adding a supplement of 0.2% solution of sodium selenate or a combined preparation of selenium and vitamin E-Selevit.  相似文献   

Personalities /Persönliches     

Prof. Dr.  DDr. h. c. Yoshirnasa Nishikawa 《Reproduction in domestic animals》1994,29(3):333-333

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Sensitivity and Error Limits of Two Tests for Distemper Virus Neutralizing Antibody: A Conventional Neutralization Test and the “Single Dilution-Probit Test”     

J. P. Lo  S. E. Svehag  J. R. Gorham 《Acta veterinaria Scandinavica》1965,6(1):341

The sensitivity and error limits of a conventional in ovo neutralization test for antibody to distemper virus were compared with the same parameters of a single dilution-probit test for neutralizing antibody.With the former test, antibody was demonstrable in ferrets 8 days following a single subcutaneous injection of virus while probit analysis of data from the single dilution test revealed the appearance of antibody as early as 4 days post-immunization. The error terms of the single dilution test were relatively large as compared to those of the conventional test for antibody.Distinctly biphasic antibody responses were observed in ferrets following a single subcutaneous injection of distemper virus.  相似文献   

柑桔无病虫栽培试验初报   总被引：1，自引：0，他引：1  

林孔湘  李扬升  罗志达  唐国丕 《植物保护学报》1982,9(1):1-8

柑桔类的严重病虫主要由苗木带入新区,造成危害。因而培育不带有这些病虫的苗木(简称无病虫苗木),在隔离地点建立果园并采取防疫措施,殊为预防新果区发生此类病虫危害的根本办法。(林孔湘1975) 1974年春,我们开始采用热水消毒种子和采用洗刷接穗芽条并用蒸汽和药剂消毒接穗芽条的方法,在隔离地点培育各种柑桔类的无病虫实生苗和嫁接苗。1976年第一批无病虫苗木出圃,栽植在各地。在隔离和防疫条件不同的情况下,这些新果园发生的病虫危害有明显差异。隔离及防疫条件较好的果园,一年之后检查,除潜叶蛾外,没有发现任何其他病虫。而与有病虫的柑桔树接近的或虽有隔离而不注意防疫的果园,很快或不久便受到各种病虫侵害。试验结果表明,用无病虫苗木在隔离地点建立果园,并采用严格防疫措施,可长期不发生严重病虫的危害,既可保证不会发生黄龙病和斑黄病等类似病毒病的危害,又可节省喷药防病虫的费用。这是在国内外尚未见报道的一项技术革新。  相似文献