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2. Effects of land use and cultivation histories on the distribution of soil organic carbon stocks in the area of the Northern Nile Delta in Egypt

Author

Nabil Benkahla, Mohamed Hechemi El Ouni, Mohamed Abdel Zaher, Farahat S. Moghanm, Muhammad Bilal, Hamdi Ayed, Essaied Laatar, Khaled Mohamed Khedher, Muhammad Arshad, and Abir Mouldi

Subjects
Land use, business.industry, Agroforestry, 020209 energy, Global warming, Distribution (economics), 02 engineering and technology, Soil carbon, 010501 environmental sciences, 01 natural sciences, Bulk density, Natural resource, Sustainability, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, Kyoto Protocol, business, 0105 earth and related environmental sciences, General Environmental Science
Abstract

Precise knowledge of the soil organic carbon (SOC) stocks under various land uses is needed to meet the Kyoto Protocol and for the sustainability of natural resources. The purpose of the present st...

Published
2020

3. Prediction models based on soil properties for evaluating the heavy metal uptake into Hordeum vulgare L. grown in agricultural soils amended with different rates of sewage sludge

Author

Khaled Mohamed Khedher, Kamal H. Shaltout, Ebrahem M. Eid, Hamdi Ayed, Muhammad Arshad, Ahmed F. El-Bebany, Tarek M. Galal, Abir Mouldi, Ali Alshehri, and Nasser Sewelam

Subjects
Biosolids, business.industry, Chemistry, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, General Medicine, 010501 environmental sciences, 01 natural sciences, Pollution, Metal, 03 medical and health sciences, 0302 clinical medicine, Agriculture, visual_art, Environmental chemistry, Soil water, Shoot, visual_art.visual_art_medium, Soil properties, 030212 general & internal medicine, Hordeum vulgare, business, Sludge, 0105 earth and related environmental sciences
Abstract

The current study aims at forming new prediction models to be employed in the approximating the possible uptake of a range of 10 heavy metals (HMs) (Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb and Zn) by Hordeum vulgare tissues including roots, shoots and grains following its growth in soil amended with sewage sludge (SS) using conditions employed in greenhouses. The present study determined an insignificant difference between the actual and predicted quantities of the HMs in the three tissues using t values. The majority of the predicted quantities of the HMs were acceptable with the exception of Cd in the shoots, Cu in grains and Pb in roots. Consequently, it is possible to use these models in assessing the cultivation of barley plants in soil amended with SS in a safe way, while simultaneously monitoring any potential risks to the health of humans.

Published
2020

4. Seasonal potential of Phragmites australis in nutrient removal to eliminate the eutrophication in Lake Burullus, Egypt

Author

Kamal H. Shaltout, Ebrahem M. Eid, Hamdi Ayed, Kai Jensen, Khaled Mohamed Khedher, Tarek M. Galal, Yassin M. Al-Sodany, and Soliman A. Haroun

Subjects
0106 biological sciences, Mediterranean climate, eutrophic lakes, mediterranean, Wetland, 010501 environmental sciences, Aquatic Science, 01 natural sciences, wetlands, Phragmites, Nutrient, nutrients, lcsh:QH540-549.5, lcsh:Environmental sciences, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, lcsh:GE1-350, geography, geography.geographical_feature_category, Ecology, 010604 marine biology & hydrobiology, food and beverages, water and sediment characteristics, macrophytes, Macrophyte, Environmental science, lcsh:Ecology, Eutrophication, common reed
Abstract

The present study was conducted to investigate the potential of the emergent macrophytes Phragmites australis to remediate nutrients and restore an eutrophic wetland (Lake Burullus, Egypt). The plant was sampled monthly for one year from 6 sites distributed equally along the northern and southern parts of this lake. Monthly significant variation in all investigated sediment and water nutrients for the northern and southern sites was recorded. The biomass of P. australis in the southern sites was greater than that of the northern sites; in addition, the above-ground biomass was greater than the below-ground biomass. The above-ground biomass increased from February until it reached its maximum during August and then decreased again. Likewise, the highest nutrient concentrations in the different tissues were recorded at the beginning of the growing season during winter and early spring and then gradually decreased with increasing plant biomass. Moreover, the nutrient content (g/m2) increased from the early growing season (February) and reached its peak during April–August and then decreased. Based on our results, P. australis could be used for the extraction of nutrients to reduce the eutrophication in Lake Burullus, if the above-ground biomass is harvested at its maximum value in August, as was the case regarding the maximum content of most nutrients.

Published
2020

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