scholarly journals Impact of ecological restoration techniques on the dynamics of degraded ecosystems of the mounts of Saida: Case of the forests of Doui Thabet (West Algeria)

2020 ◽  
Vol 7 (2) ◽  
pp. 98-121
Author(s):  
Aouadj Sid Ahmed ◽  
Nasrallah Yahia ◽  
Hasnaoui Okkacha ◽  
Khatir Hadj
Keyword(s):  
Pinus Halepensis ◽  
Pistacia Lentiscus ◽  
Seedling Density ◽  
Controlled Burning ◽  
Tetraclinis Articulata ◽  
Restoration Techniques ◽  
Different Seasons ◽  
Field Device ◽  
Degraded Ecosystems ◽  
The Impact

AbstractThe aim of the present study aims to establish the impact of different restoration techniques (soil and vegetation works) of five pioneer species of the Doui Thabet forest (Mounts of Saida, West of Algeria): Pinus halepensis, Pistacia lentiscus., Tetraclinis articulata, Juniperus oxycedru,. and Stipa capensis (= S. tenacissima L.) between 2018 and 2020. An experimental field device covering an area of 1 ha has been installed in the Doui Thabet forest in a Pinus halepensis massive more than 80 years old. The following work was carried out: mechanical grinding of the vegetation (chopping), turning (scarification of soil) to a depth of 10 cm, tillage (Deep ploughing) to a depth of 20 cm, controlled burning of branches, clearing of Stipa capensis, seedlings planted in different seasons for certain species (Stipa capensis = S. tenacissima L.), monitoring of stump rejections and natural sowing. The sowing result varies according to the species and restoration techniques, it is high for Pinus halepensis and Stipa capensis. It is low for Tetraclinis articulata and Juniperus oxycedrus and none for Pistacia lentiscus while for Stipa capensis it is quite high when planted in autumn compared to spring. Turning and burning have proven to be the most abundant treatments for regeneration and growth. Grinding has medium seedling density and growth, while deep tillage and natural sowing showed low seedling density and growth.

scholarly journals Evaluación de la supervivencia y del crecimiento en la reforestación del proyecto piloto de Albatera tras 12 años

2016 ◽  
Vol 3 (2) ◽  
pp. 40-49
Author(s):  
John Molina ◽  
V. Ramón Vallejo ◽  
Alberto Villagrosa
Keyword(s):  
Pinus Halepensis ◽  
Pistacia Lentiscus ◽  
Ceratonia Siliqua ◽  
Quercus Coccifera ◽  
Juniperus Oxycedrus ◽  
Tetraclinis Articulata ◽  
Olea Europea ◽  
Chamaerops Humilis ◽  
Sobre Todo

El presente trabajo consiste en el seguimiento y evaluación de los resultados de la restauración forestal ecológica realizada en la cuenca de Albatera durante los años 2003 y 2004, poniendo énfasis en la supervivencia después del verano de 2014 comparada con la supervivencia registrada en los años anteriores.Para la toma de los datos ha sido necesario desplazarse a la cuenca durante 20 días entre los meses de febrero y marzo del 2015 para recoger datos de supervivencia y tamaño de las diez especies estudiadas: tres especies arbóreas (Pinus halepensis, Tetraclinis articulata, Ceratonia siliqua) y siete arbustivas (Pistacia lentiscus, Quercus coccifera, Rhamnus lycioides, Ephedra fragilis, Chamaerops humilis, Juniperus oxycedrus y Olea europea ssp sylvestris). Además fue necesario realizar otras tareas como la revisión de los datos históricos de las repoblaciones realizadas como del clima de la zona.Los resultados muestran mayor supervivencia y crecimiento de los plantones plantados en la solana sobre los de umbría, y sobre todo sobre los ubicados en la unidad de terrazas forestales. Además se encontró una mayor supervivencia de los especímenes plantados en la campaña del año 2004 respecto a los introducidos en la campaña del 2003.

scholarly journals Restoring degraded ecosystems through the biowaste application: Stability of agreggates, infiltration and vegetation cover

2018 ◽  
pp. 63-79 ◽  
Author(s):  
Paloma Hueso González ◽  
Juan Francisco Martínez-Murillo ◽  
José Damián Ruíz-Sinoga
Keyword(s):  
Pinus Halepensis ◽  
Aggregate Stability ◽  
Mediterranean Area ◽  
Management Technique ◽  
Organic Residues ◽  
Secondary Products ◽  
Environmental Implications ◽  
Infiltration Rates ◽  
Restoration Techniques ◽  
Degraded Ecosystems

La transición hacia una economía circular, en la que los recursos se conserven y se reduzca la generación de residuos, es una necesidad real para lograr una economía sostenible. Dentro de ella, cobra particular importancia la gestión de los residuos orgánicos o bioresiduos, tanto por la cantidad que suponen como por las implicaciones ambientales de su mala gestión. El objetivo de este estudio es evaluar los efectos de los bioresiduos como técnicas de restauración en paisajes forestales mediterráneos degradados. Para el mismo, se utilizan dos tipos de acolchados orgánicos generados como subproductos de actividades silvícolas y agrícolas en el entorno más inmediato al área de estudio: (i) bioresiduo tipo acolchado de restos de paja y; (ii) bioresiduo tipo acolchados de astillas de pino carrasco (Pinus halepensis Mill.). Nuestros resultados describen un aumento de la macro-agregación y las tasas de infiltración del suelo, en los primeros en los 24 primero meses, tras la adición de los dos tipos de bioresiduos. Ello ha permitido un mejor aprovechamiento del agua disponible en el perfil del suelo, generando aumento en las tasas de supervivencia. Desde un punto de vista de gestión forestal, tras este estudio, se puede sugerir el uso de bioresiduos en los procesos de restauración de cubierta en áreas forestales mediterráneas. Nowadays, the transition to a Circular Economy, in which wastes can be reduced, responds to a real and tangible need. Base on this, the management of organic residues acquires special prominence. This is because of the huge amount of wastes pr oduced and the environmental implications of their mismanagement. Based on this premise, the objective of this study is to evaluate the effects of certain types of organic residues as restoration techniques in a degraded Mediterranean area. Two types of or ganic wastes are selected: (i) straw mulch; and (ii) mulch with chipped branch of Pinushalepensis Mill . The wastes have been generated as secondary products during forestry and agricultural activities in the surrounding area. Independently of the treatment applied, our results show an increase in macro - aggregate stability and in the infiltration rates. This implies more available water for plants and, thus, the increment in the rates of survival plants. Consequently, the use of bio - wastes can be an effectiv e management technique to restore Mediterranean degraded areas.

Static and Dynamic Studies of Gasoline in View of its Octane Number and its Toxic Effect

2013 ◽  
Vol 12 (7) ◽  
pp. 451-459
Author(s):  
Ashraf Yehia El-Naggar ◽  
Mohamed A. Ebiad
Keyword(s):  
Toxic Effect ◽  
Aromatic Hydrocarbons ◽  
Octane Number ◽  
Liquid Fuel ◽  
Positive Impact ◽  
Hydrocarbon Composition ◽  
Different Temperatures ◽  
Different Seasons ◽  
The One ◽  
The Impact

Gasoline come primarily from petroleum cuts, it is the preferred liquid fuel in our lives. Two gasoline samples of octane numbers 91 and 95 from Saudi Arabia petrol stations were studied. This study was achieved at three different temperatures 20oC, 30oC and 50oC representing the change in temperatures of the different seasons of the year. Both the evaporated gases of light aromatic hydrocarbons (BTEX) of gasoline samples inside the tank were subjected to analyze qualitatively and quantitatively via capillary gas chromatography. The detailed hydrocarbon composition and the octane number of the studied gasoline samples were determined using detailed hydrocarbon analyzer. The idea of research is indicating the impact of light aromatic compounds in gasoline on the toxic effect of human and environment on the one hand, and on octane number of gasoline on the other hand. Although the value of octane number will be reduced but this will have a positive impact on the environment as a way to produce clean fuel.

Biomass of understory species of Pinus halepensis Mill. forests in the Kassandra Peninsula - Chalkidiki

1998 ◽  
Vol 63 ◽  
Author(s):  
P. Smiris ◽  
F. Maris ◽  
K. Vitoris ◽  
N. Stamou ◽  
P. Ganatsas
Keyword(s):  
Moisture Content ◽  
Aboveground Biomass ◽  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Biomass Estimation ◽  
Regression Equations ◽  
Pistacia Lentiscus ◽  
Quercus Coccifera ◽  
Understory Species ◽  
Cistus Incanus

This  study deals with the biomass estimation of the understory species of Pinus halepensis    forests in the Kassandra peninsula, Chalkidiki (North Greece). These  species are: Quercus    coccifera, Quercus ilex, Phillyrea media, Pistacia lentiscus, Arbutus  unedo, Erica arborea, Erica    manipuliflora, Smilax aspera, Cistus incanus, Cistus monspeliensis,  Fraxinus ornus. A sample of    30 shrubs per species was taken and the dry and fresh weights and the  moisture content of    every component of each species were measured, all of which were processed  for aboveground    biomass data. Then several regression equations were examined to determine  the key words.

scholarly journals Hydrochemical Characterisation of High-Fluoride Groundwater and Development of a Conceptual Groundwater Flow Model Using a Combined Hydrogeological and Hydrochemical Approach on an Active Volcano: Mount Meru, Northern Tanzania

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2159
Author(s):  
George Bennett ◽  
Jill Van Reybrouck ◽  
Ceven Shemsanga ◽  
Mary Kisaka ◽  
Ines Tomašek ◽  
...  
Keyword(s):  
Drinking Water ◽  
Large Scale ◽  
Active Volcano ◽  
Aquifer System ◽  
Groundwater Samples ◽  
Northern Tanzania ◽  
Different Seasons ◽  
High Fluoride ◽  
Arusha National Park ◽  
The Impact

This study characterises high-fluoride groundwater in the aquifer system on the flanks of Mount Meru, focusing on parts of the flanks that were only partially or not at all covered by previous research. Additionally, we analyse the impact of rainwater recharge on groundwater chemistry by monitoring spring discharges during water sampling. The results show that the main groundwater type in the study area is NaHCO3 alkaline groundwater (average pH = 7.8). High F− values were recorded: in 175 groundwater samples, the concentrations range from 0.15 to 301 mg/L (mean: 21.89 mg/L, median: 9.67 mg/L), with 91% of the samples containing F− values above the WHO health-based guideline for drinking water (1.5 mg/L), whereas 39% of the samples have Na+ concentrations above the WHO taste-based guideline of 200 mg/L. The temporal variability in F− concentrations between different seasons is due to the impact of the local groundwater recharge. We recommend that a detailed ecohydrological study should be carried out for the low-fluoride springs from the high-altitude recharge areas on the eastern and northwestern flanks of Mount Meru inside Arusha National Park. These springs are extracted for drinking purposes. An ecohydrological study is required for the management of these springs and their potential enhanced exploitation to ensure the sustainability of this water extraction practice. Another strategy for obtaining safe drinking water could be to use a large-scale filtering system to remove F− from the groundwater.

scholarly journals The impact of regular sperm donation on bulls’ seminal plasma hormonal profile and phantom response

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alicja Kowalczyk ◽  
Elżbieta Gałęska ◽  
Ewa Czerniawska-Piątkowska ◽  
Anna Szul ◽  
Leszek Hebda
Keyword(s):  
Seminal Plasma ◽  
Sperm Donation ◽  
Hormonal Profile ◽  
Holstein Friesian ◽  
Different Seasons ◽  
Day Of The Week ◽  
The Impact ◽  
The Relationship ◽  
Positive Effect

AbstractThe aim of this study was to analyze the relationship between the concentration of hormones in the seminal plasma, the bull maintenance system in the insemination station, and the regularity of sperm donation and the response to the phantom (libido level). An additional goal was to determine whether there is a relationship between the hormonal profile in the blood, the sperm plasma, the oxidative and antioxidant profile in the blood of bulls and the biometry of their testicles and scrotum, as well as the quality of their sperm in both different seasons and intensities of reproductive use. For the study, 220 healthy and sexually mature Polish Holstein–Friesian bulls were used. They all had normal libido and were fed equally. The animals were grouped according to the scheme: young (16–20 month/n = 60) and old (26–30 month/n = 60) including: individually housed (n = 30) and group housed (n = 30) young, old individually housed (n = 30) and group housed (n = 30) (n total animals = 120); young animals donating semen once a week (every Thursday) (n = 25) and sporadically (once every two months on a random day of the week) (n = 25), old animals donating semen once a week (every Thursday) (n = 25 ) and sporadic donors (once every two months on a random day of the week) (n = 25) (n total animals = 100). When analyzing the results of this study, it should be stated that regular use has a positive effect on the secretion of sex hormones in bulls. Higher levels of testosterone and lower levels of estradiol and prostaglandins resulted in higher sexual performance, expressed by a stronger response to the phantom. The differences in favor of regular use were independent of the bull's age. The results of our research illustrate that the quality of semen and its freezing potential may depend on the season and frequency of its collection, as well as on the age of the males.

scholarly journals The impact of the air temperature on measuring the zenith angle during the year in the ground layer of the atmosphere for the needs of engineering surveying

2021 ◽  
Vol 61 (3) ◽  
pp. 476-488
Author(s):  
Tomáš Suk ◽  
Martin Štroner
Keyword(s):  
Czech Republic ◽  
Numerical Model ◽  
Central Europe ◽  
Air Temperature ◽  
Zenith Angle ◽  
Geographical Area ◽  
Temperature Gradients ◽  
The Czech Republic ◽  
Different Seasons ◽  
The Impact

This paper presents the results of over a year-long experiment dealing with a temperature measurement to calculate the theoretical effect of the atmosphere on the measured zenith angle in engineering surveying. The measurements were performed to determine the accurate and specific temperatures (temperature gradients), which can be recorded in different seasons in the low level of the atmosphere (up to 2 m above the ground, where most Engineering Surveying measurements take place) for the geographical area of Central Europe - specifically the Czech Republic. A numerical model was then applied to the resulting determined temperature gradients to calculate the path of the beam passing through an inhomogeneous atmosphere. From these values, the apparent vertical shifts caused by refraction in a given environment and time were finally determined.

scholarly journals Influence of seasonal changes on the karyotype stability of Ukrainian Black and White dairy cows

2020 ◽  
Vol 22 (93) ◽  
pp. 29-34
Author(s):  
N. Y. Temekh ◽  
L. F. Starodub
Keyword(s):  
Seasonal Changes ◽  
Age Groups ◽  
Summer Season ◽  
Black And White ◽  
Structural Disorders ◽  
Different Seasons ◽  
The Stability ◽  
The Impact ◽  
Dairy Breed ◽  
Karyotype Stability

Of the total dairy cattle, 49 % belong to the Ukrainian black-and-white dairy breed. Animals are demanding to the conditions of detention, so the aim of the study was to study the impact of seasonal changes in the environment on the stability of the karyotype of cows of three age groups (first-born, adult and cows 8–10 years). The variability of the karyotype of the studied animals in different seasons of the year was manifested in the form of quantitative and structural disorders of chromosomes. Of the total dairy cattle, 49 % belong to the Ukrainian black-and-white dairy breed. Animals are demanding to the conditions of detention, so the aim of the study was to study the impact of seasonal changes in the environment on the stability of the karyotype of cows of three age groups (first-born, adult and cows 8–10 years). The variability of the karyotype of the studied animals in different seasons of the year was manifested in the form of quantitative and structural disorders of chromosomes. In primiparous women, the most pronounced genomic variability (aneuploidy) was observed in summer and winter and was 16.4 % and 8.8 %. In summer, this variability was more than twice the limit of spontaneous chromosomal variability. The highest percentage of structural chromosome abnormalities (chromosomal breaks) in cows of three age groups was observed in winter and was 2.5 %, 2.8 %, 3.0 %, respectively, and did not exceed the limit of spontaneous mutagenesis characteristic of cattle. An increased proportion of lymphocytes with a micronucleus in first-borns and cows aged 8–10 years (5.6 ‰, 6.4 ‰, respectively) was observed in the summer. The increased proportion of dinuclear lymphocytes appeared in the first-born in the summer season and amounted to 7.6 ‰ (at P > 0.99), and in cows 8–10 years, this variability in the summer season was 6.2 ‰, in winter – 6.7 ‰ with a statistically significant difference (P > 0.95) between the spontaneous level of cytogenetic variability. The association between karyotype stability of the studied animals and seasonal environmental factors was determined using a correlation coefficient (r). A significant positive correlation was found between aneuploidy and air temperature in primiparous and cows aged 8–10 years, relative humidity, precipitation and wind strength and chromosomal gaps in primiparous and adult cows, atmospheric pressure, relative humidity and asynchronous divergence. in adult cows and cows aged 8–10 years. A positive reliable associative dependence of the appearance of micronucleus lymphocytes and dinuclear lymphocytes on the amount of precipitation and wind strength in this area in primiparous and adult cows was established.

scholarly journals Seasonal Characteristics of Disdrometer-Observed Raindrop Size Distributions and Their Applications on Radar Calibration and Erosion Mechanism in a Semi-Arid Area of China

2020 ◽  
Vol 12 (2) ◽  
pp. 262 ◽  
Author(s):  
Zongxu Xie ◽  
Hanbo Yang ◽  
Huafang Lv ◽  
Qingfang Hu
Keyword(s):  
Rainfall Intensity ◽  
Shaanxi Province ◽  
Theoretical Formula ◽  
Size Distributions ◽  
Seasonal Characteristics ◽  
Different Seasons ◽  
Raindrop Size ◽  
Radar Calibration ◽  
The Impact ◽  
Semi Arid

Raindrop size distributions (DSDs) are the microphysical characteristics of raindrop spectra. Rainfall characterization is important to: (1) provide information on extreme rate, thus, it has an impact on rainfall related hazard; (2) provide data for indirect observation, model and forecast; (3) calibrate and validate the parameters in radar reflectivity-rainfall intensity (Z-R) relationships (quantitative estimate precipitation, QPE) and the mechanism of precipitation erosivity. In this study, the one-year datasets of raindrop spectra were measured by an OTT Parsivel-2 Disdrometer placed in Yulin, Shaanxi Province, China. At the same time, four TE525MM Gauges were also used in the same location to check the disdrometer-measured rainfall data. The theoretical formula of raindrop kinetic energy-rainfall intensity (KE-R) relationships was derived based on the DSDs to characterize the impact of precipitation characteristics and environmental conditions on KE-R relationships in semi-arid areas. In addition, seasonal rainfall intensity curves observed by the disdrometer of the area with application to erosion were characterized and estimated. The results showed that after quality control (QC), the frequencies of raindrop spectra data in different seasons varied, and rainfalls with R within 0.5–5 mm/h accounted for the largest proportion of rainfalls in each season. The parameters in Z-R relationships (Z = aRb) were different for rainfall events of different seasons (a varies from 78.3–119.0, and b from 1.8–2.1), and the calculated KE-R relationships satisfied the form of power function KE = ARm, in which A and m are parameters derived from rainfall shape factor μ. The sensitivity analysis of parameter A with μ demonstrated the applicability of the KE-R formula to different precipitation processes in the Yulin area.

Monitoring ley pastures and their response to winter cleaning

2006 ◽  
Vol 46 (8) ◽  
pp. 1023 ◽  
Author(s):  
E. C. Wolfe ◽  
J. A. Paul ◽  
P. D. Cregan
Keyword(s):  
Rapid Development ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Total Biomass ◽  
Seedling Density ◽  
Bare Ground ◽  
Herbicide Application ◽  
Seeding Rate ◽  
The Impact ◽  
Legume Growth

The purposes of this study were to evaluate subterranean clover-based leys on farms and in experiments using several pasture parameters, and to assess the impact of winter cleaning on the productivity and botanical composition of clover swards. Annual pastures were monitored on a group of 5 farms in the Wagga district and compared with an experimental subterranean clover (Trifolium subterraneum L.) pasture. The major problem in the farm paddocks was a lack of legume biomass due to poor legume densities, a consequence of the use of the soft-seeded cultivar Woogenellup and a high content of grassy weeds. The farmers in the group were unaware of the tools, parameters and benchmarks for making quantitative pasture comparisons. In 2 experiments, a range of subterranean clover swards were generated through the use of cultivars, seeding rate and winter cleaning treatments, grazed at 15 sheep/ha and monitored for 3 years. Appropriate benchmark values for the seed pool of subterranean clover were 300–350 kg/ha in winter and 600–700 kg/ha in summer. On the basis of both winter production, a function of May seedling density (target >1000 seedlings/m2) and spring production, which depended on the cultivar maturity, Junee was superior at Wagga to either Dalkeith (earlier maturing) or Woogenellup (softer seeded). Winter cleaning, using selective herbicides (fluazifop, simazine) to remove grasses and weeds, was advantageous in achieving a high content (>90%) and productivity of subterranean clover, provided that the legume content of the pasture was at least 28%, or >20% of total ground area before herbicide application in winter. In winter-cleaned swards, legume growth increased by up to 80%, legume biomass was improved by up to 46% and legume content increased from <50 to >95%. The main disadvantages of winter cleaning were increased areas of bare ground and reduced total biomass for several weeks after herbicide application, and the rapid development of ryegrass that was resistant to at least 1 of the herbicides used. The strategic use of observations to monitor the performance of pastures and their response to management is discussed.

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