Three hydro‐seeding revegetation techniques for soil erosion control on anthropic steep slopes     

J. Albaladejo Montoro  J. Alvarez Rogel  J. Querejeta  E. Díaz  V. Castillo 《Land Degradation \u0026amp; Development》2000,11(4):315-325

Erosion control at low–medium radioactive waste disposal sites is an important concern. A study was carried out in El Cabril (Córdoba, Spain) on two 40 per cent anthropic steep slopes in order to test the effectiveness of hydro‐seeding techniques for controlling soil erosion. Two groups of 10 m × 3 m plots were established. The treatments tested were: hydro‐seeding with the application of vegetal mulch (VM); hydro‐seeding with added humic acids (HA); hydro‐seeding with vegetal mulch and humic acids added (VM + HA); and a control without hydro‐seeding or soil amendment (C). Fifteen run‐off producing rainfall events were recorded during the study period, with intensities ranging between 2 mm h⁻¹ and 33·6 mm h⁻¹. All treatments significantly reduced runoff and soil loss (p < 0·05). The VM+HA treatment was the most effective, reducing 98·5 per cent of total soil loss. The HA treatment (97·1 per cent reduction) was also more effective than the VM treatment (94·8 per cent reduction). A great reduction in runoff and sediment yield was observed in the treated plots during the first stages after hydro‐seeding. This result may be attributed to the combined effect of: (a) the protection against raindrop impact due to the application of straw and mulch to the soil surface, and (b) a general improvement in the soil's structure brought by the organic amendments. Seven months after hydro‐seeding, an increase in the density of the plant cover could be added to the beneficial effects mentioned above. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Habitat characterization,anthropogenic impacts and conservation of rhodolith beds off southeastern Malta     

Luke Tabone  Leyla Knittweis  Ricardo Aguilar  Helena Alvarez  Joseph A. Borg  Silvia Garcia  Patrick J. Schembri  Julian Evans 《水产资源保护:海洋与淡水生态系统》2024,34(4):e4148

Submicroscopy of Aggregates of Luvic Phaeozems under Different Land Uses in the Southeast of the Buenos Aires Province,Argentina     

Maria Fernanda Alvarez  Margarita Luisa Osterrieth 《Eurasian Soil Science》2018,51(12):1487-1496

Eurasian Soil Science - Soil aggregates are key elements of soil structure that play an important role in several soil processes. One of the major factors that affect soil structure are the...  相似文献   

Simple estimation of available water capacity in soils of semiarid and subhumid environments     

Josefina Luisa De Paepe  Alfredo Angel Bono  Roberto Alvarez 《Arid Land Research and Management》2018,32(2):133-148

Soil available water capacity (AWC) is an important factor affecting soil productivity in semiarid and subhumid environments and is mainly determined by the soil textural composition. As the soils of these environments usually present fairly uniform textures across depth, we hypothesized that it would be possible to accurately estimate the whole-profile AWC using surface information. Our objective was to test this hypothesis in the Argentine Semiarid Pampas. Information was collected from 152 sites where AWC was measured in 20?cm layers up to a depth of 140?cm or up to the upper limit of the petrocalcic horizon, when present. In each case, whole profile AWC was estimated using a one-step and a two-step approach, comparing multiple regression and artificial neural networks as modeling techniques. Both modeling methods were effective (R²?>?0.76, P?相似文献   

In Vitro and In Vivo Feedstuff Digestibility for Snook,Centropomus undecimalis,Juveniles          下载免费PDF全文

Iratzio Lemus  Carlos Maldonado  Gerard Cuzon  Adolfo Sanchez  Gabriela Gaxiola  Alfonso Alvarez  Martha Guerrero 《Journal of the World Aquaculture Society》2018,49(1):205-215

The degree of hydrolysis (DH) of the ingredients was evaluated for Centropomus undecimalis juveniles. The in vitro experiment included wheat gluten (WG), corn gluten (CG), soybean meal (SBM) and pretreated phytase (SBM + phytase), soy protein concentrate (SPC), canola meal (CAN) and pretreated phytase (CAN + phytase), poultry byproduct meal (PBPM), chicken meal (CHKM), dried whey (DW), Pota meal (PM: mix of giant squid, fish soluble protein concentrate, crustacean meal, and fish oil), and Protiblend (PTB: aquatic and render mix). The highest acidic DH occurred with PTB (0.38 ± 0.06), CHKM (0.33 ± 0.3), and PBPM (0.25 ± 0.03). In the alkaline condition, PTB (1.6 ± 0.17 and 0.98 ± 0.05 for pyloric caeca and intestine, respectively) and CG (1.04 ± 0.4 and 0.75 ± 0.2 for caeca and intestine, respectively) provided the highest DH values. In vitro digestibility demonstrated that PTB was the highest (85.3%) followed by PBPM (51.4%), CAN + phytase (47.6%), CG (45.1%), and CHKM (46.5%). The in vivo experiment concerned the WG, CHKM, PBPM, PM, and PTB diets plus a reference diet with fishmeal (Ref diet). The total %DH was different (P < 0.05) with the lowest values for the WG diet (0.34 ± 0.09%) and Ref diet (0.34 ± 0.15). Free amino acid released during digestion was displayed for these diets and a bifactorial analysis produced no difference (P > 0.05). The apparent digestive coefficients ranged from 89.8 to 92.9% for protein and from 68 to 71.4% for energy.  相似文献   

Are active organic matter fractions suitable indices of management effects on soil carbon? A meta-analysis of data from the Pampas     

Carina Rosa Alvarez  Roberto Alvarez 《Archives of Agronomy and Soil Science》2016,62(11):1592-1601

Active fractions of organic matter have been proposed as early indices of changes in soil organic carbon (organic-C) induced by management. We performed a meta-analysis of published results from 31 field experiments conducted in the Pampas in which tillage and rotation effects on organic-C, microbial biomass carbon (microbial-C), light fraction carbon (light-C), particulate carbon (particulate-C) and basal respiration (mineralized-C) were assessed. We compared the changes of organic-C and the four active fractions between management treatments sampled at the same date and depth within each experiment. Pooling all the experiments, active fractions-C varied on average 1.2- to 3.0-fold more than organic-C, depending on the fraction considered, but these average changes were significantly greater than organic-C changes only for particulate-C. This later fraction showed to be more sensitive to agricultural practices than organic-C. In experiments in which organic-C changes were lower than 15–25%, the four labile fractions may show opposite trends than organic-C. Above this threshold, changes of active fractions generally copied organic-C changes and were greater. Consequently, the active fractions may be used as indicators of changes in organic-C only when this latter variable has already suffered a huge change. In these cases, it will be easier to simply measure organic-C.  相似文献   

Diversity of phenotypic (plant and grain morphological) and genotypic (glutenin alleles in Glu-1 and Glu-3 loci) traits of wheat landraces (Triticum aestivum) from Andalusia (Southern Spain)     

Marcela Ayala  Carlos Guzmán  Roberto J. Peña  Juan B. Alvarez 《Genetic Resources and Crop Evolution》2016,63(3):465-475

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Genetic diversity for seed storage proteins in Lebanon and Turkey populations of wild diploid wheat (<Emphasis Type="Italic">Triticum urartu</Emphasis> Thum. ex Gandil.)     

L. Caballero  M. A. Martín  J. B. Alvarez 《Genetic Resources and Crop Evolution》2009,56(8):1117-1124

Triticum urartu is a wild diploid wheat identified as donor of the A genome in the durum and bread wheats. This species has its natural distribution zone in the Fertile Crescent. Nine populations from this zone (five Lebanese and four Turkish) were analysed for the variation in the loci coding of endosperm storage proteins: glutenins (Glu-A ^u 1 and Glu-A ^u 3) and gliadins (Gli-A ^u 1 and Gli-A ^u 2). Up to 10 alleles for the Glu-A ^u 1 locus, 16 for the Glu-A ^u 3 locus, 15 for the Gli-A ^u 1 locus and 18 for the Gli-A ^u 2 locus were found. The Turkish populations showed greater diversity than the Lebanese populations, distributing mainly within populations, whereas the inverse process takes place for the Lebanese populations. The values of the genetic diversity indicated that, although these materials showed high level of variability, exist a real risk of genetic erosion.  相似文献   

Effect of paratuberculosis on the diagnosis of bovine tuberculosis in a cattle herd with a mixed infection using interferon-gamma detection assay     

Alvarez J  de Juan L  Bezos J  Romero B  Sáez JL  Marqués S  Domínguez C  Mínguez O  Fernández-Mardomingo B  Mateos A  Domínguez L  Aranaz A 《Veterinary microbiology》2009,135(3-4):389-393

Interferon-gamma (IFN-gamma) detection assay is being applied as an ancillary test to tuberculin tests in the diagnosis of bovine tuberculosis to detect the maximum number of infected animals. Among possible factors influencing the performance of tuberculosis-diagnostic tests, paratuberculosis, a widespread disease in Spain and other European countries, has been pointed out as a cause of false positive reactions. Still, its effect on the sensitivity of these tests in cattle has yet to be fully characterized. The impact of paratuberculosis in the apparent sensitivity of IFN-gamma assay was studied in a bullfighting cattle herd with a mixed tuberculosis-paratuberculosis infection, using culture of Mycobacterium bovis and Mycobacterium avium paratuberculosis as the gold standard to determine the infection status of every animal. A total of 218 animals were slaughtered and sampled for bacteriology after blood sampling. IFN-gamma assay showed a lower apparent sensitivity in animals with a mixed infection (50%) compared to all animals suffering tuberculosis (78.3%). This finding indicates that the presence of paratuberculosis in tuberculosis-infected herds could imply a serious impairment in the sensitivity of IFN-gamma detection test.  相似文献   

Silica content in soil solution and its relation with phytolith weathering and silica biogeochemical cycle in Typical Argiudolls of the Pampean Plain,Argentina—a preliminary study   总被引：1，自引：0，他引：1  

Natalia Borrelli  María Fernanda Alvarez  Margarita L. Osterrieth  Jorge E. Marcovecchio 《Journal of Soils and Sediments》2010,10(6):983-994

Purpose  

Little is known on the silica biogeochemical cycle in terrestrial environments. The aim of this work is to assess phytolith’s role on the biogeochemical cycle of Si in Typical Argiudolls under different vegetation of the Pampean Plain, Argentina.  相似文献