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| 1 | Aging Effects of Organic and Inorganic Fertilizers on Phosphorus Fractionation in a Calcareous Sandy Loam Soil显示文摘In most arid and semiarid soils, naturally occurring phosphorus(P) is a major yield-limiting plant nutrient. In this study, to investigate the effects of organic(OP) and inorganic P(IP) sources on P fractionation, a calcareous sandy loam alkaline soil was fertilized with OP and IP fertilizers at low(80 mg P kg^(-1) soil) and high(160 mg P kg^(-1) soil) application rates. Three combinations of OP and IP(i.e., 75% OP + 25% IP, 50% OP + 50% IP, and 25% OP + 75% IP) were applied at low and high application rates,respectively, followed by soil aging for 21 d. Soil samples were collected after 1, 2, 3, 7, and 21 d and subjected to sequential extraction to analyze soluble and exchangeable, Fe-and Al-bound, Ca-bound, and residual P fractions. The soluble and exchangeable P fraction significantly increased up to 24.3%, whereas the Ca-bound fraction decreased up to 40.7% in the soils receiving 75% OP + 25% IP and 50% OP + 50% IP, respectively, compared with the control(receiving no P fertilizer). However, the transformation of P fractions was influenced by aging time. Addition of P sources caused instant changes in different P fractions, which then tended to decline with aging time. Change in soil p H was the limiting factor in controlling P availability. At high application rate, the OP source significantly increased soil P availability compared with the IP source with soil aging. Depending on P fractionation, a proper combination of OP and IP fertilizers, as long-term slow and instant P-releasing sources for plant uptake, respectively, may be a sustainable strategy to meet crop P requirements in the arid and semiarid soils. | Munir AHMAD Mahtab AHMAD Ahmed H.EL-NAGGAR Adel R.A.USMAN Adel ABDULJABBAR Meththika VITHANAGE Jamal ELFAKI Abdulelah AL-FARAJ Mohammad I.AL-WABEL | 2018 | Pedosphere2018，28，6： | 8 |
| 2 | Potential of biochar and organic amendments for reclamation of coastal acidic-salt affected soil显示文摘Salinity and acidity have affected several hundred million hectares of land throughout the globe which poses a major threat to global food security and biodiversity.Application of organic amendments for salt-affected soils has been identified as one of the most effective ways to mitigate salinity-induced problems and considered as a green technique offering twin benefits of waste load reduction and land reclamation.However,studies on reclaiming acidic-salt affected soils are limited.Therefore,this study aimed to determine the reclamation potential of biochars and organic amendments involving Gliricidia sepium biochar produced at 300℃,500℃,and 700℃,green waste compost,and municipal sewage sludge at three different amend-ment ratios,1.0%,2.5%and 5.0%.The incubation experiment was conducted for a 4-month period with different amendment ratios applied to the coastal acidic-salt affected soil.Subsamples were extracted from incubation pots after 1 and 4 months and analyzed for soil chemical parameters(pH,EC,NO_(3)^(−),PO_(4)^(3−,total organic carbon,cation exchange capacity,sodium adsorption ratio,exchangeable sodium percentage)and microbial enzyme activity(catalase activity,and acid-and alkaline phosphatase activity).All organic amendments demonstrated enhancement of the soil properties in a significant manner.However,increasing incubation time and amendment ratio increase the changes of soil parameters by a great percentage.Therefore,the maximum amendment ratio of 5.0%and 4 months of incubation period rendered a significant improvement in the reclamation of acidic-salt affected soil.However,the biochar produced at 500℃ contributed the maximum towards the improved physicochemical and biochemical profile of acidic-salt affected soil,making it the most promising organic amend-ment for the reclamation of acidic-salt affected soil.The overall reclamation efficiency of organic amendments registered the following order of variation:700 BC | Viraj Gunarathne Athula Senadeera Udaya Gunarathne Jayanta Kumar Biswas Yaser A.Almaroai Meththika Vithanage | 2020 | Biochar2020，2，1： | 2 |
| 3 | Trichloroethylene adsorption by pine needle biochars produced at various pyrolysis temperatures显示文摘 | Mahtab Ahmad Sang Soo Lee Anushka Upamali Rajapaksha Meththika Vithanage Ming Zhang Ju Sik Cho Sung-Eun Lee Yong Sik Ok | 2013 | Bioresource Technology2013，，： | 1 |
| 4 | Pyrolysis condition affected sulfamethazine sorption by tea waste biochars显示文摘 | ANUSHKA U R METHTHIKA V | 2014 | Bioresource Technology2014，166，8： | 1 |
| 5 | Sorption and transport of sulfamethazine in agricultural soils amended with invasive-plant-derived biochar显示文摘 | METHTHIKA V ANUSHKA U R TANG X Y | 2014 | Journal of Environmental Management2014，141，8： | 1 |
| 6 | Invasive plant-derived biochar inhibits sulfamethazine uptake by let- tuce in soil显示文摘 | ANUSHKA U R METHTHIKA V LIM J E | 2014 | Chemosphere2014，111，： | 1 |
| 7 | Biochar as a sorbent for contaminant management in soil and water: A review显示文摘 | Mahtab Ahmad Anushka Upamali Rajapaksha Jung Eun Lim Ming Zhang Nanthi Bolan Dinesh Mohan Meththika Vithanage Sang Soo Lee Yong Sik Ok | 2013 | Chemosphere2013，，： | 1 |
| 8 | Arsenic removal from water and soils using pristine and modified biochars显示文摘Arsenic(As)is recognized as a persistent and toxic contaminant in the environment that is harmful to humans.Biochar,a porous carbonaceous material with tunable functionality,has been used widely as an adsorbent for remediating As-contaminated water and soils.Several types of pristine and modified biochar are available,and significant efforts have been made toward modifying the surface of biochars to increase their adsorption capacity for As.Adsorption capacity is influenced by multiple factors,including biomass pyrolysis temperature,pH,the presence of dissolved organic carbon,surface charge,and the presence of phosphate,silicate,sulfate,and microbial activity.Improved As adsorption in modified biochars is attributed to several mechanisms including surface complexation/precipitation,ion exchange,oxidation,reduction,electrostatic interactions,and surface functional groups that have a relatively higher affinity for As.Modified biochars show promise for As adsorption;however,further research is required to improve the performance of these materials.For example,modified biochars must be eco-friendly,cost-effective,reliable,efficient,and sustainable to ensure their widespread application for immobilizing As in contaminated water and soils.Conducting relevant research to address these issues relies on a thorough understanding of biochar modifications to date.This study presents an in-depth review of pristine and modified biochars,including their production,physicochemical properties,and As adsorption mechanisms.Furthermore,a comprehensive evaluation of biochar applications is provided in As-contaminated environments as a guide for selecting suitable biochars for As removal in the field. | Wei Zhang Yoora Cho Meththika Vithanage Sabry M.Shaheen Jörg Rinklebe Daniel S.Alessi Chia-Hung Hou Yohey Hashimoto Piumi Amasha Withana Yong Sik Ok | 2022 | Biochar2022，4，1： | 0 |
| 9 | Lesson Learnt from the 2004 Tsunami:The Effect of Well Cleaning on Groundwater Quality in Coastal Aquifers in Sri Lanka显示文摘On December 26,2004,the Indian Ocean tsunami waves hit Sri Lanka resulting in the devastation of the coastal aquifers from saltwater contamination.In an attempt to speed up the cleaning process of the contaminated water in wells,large-scale and intensive campaigns went into cleaning and rehabilitating wells through pumping out saline water(physical cleansing). However,it was unclear whether these attempts improved the well-water quality,especially in terms of salinity due to density driven flow and solute transport phenomenon.Changes in water quality of a sand aquifer on the east coast of Sri Lanka owing to the December 26,2004 tsunami and | Meththika Vithanage K.G.Villholth K.Mahatantila P.Engesgaard K.H.Jensen | 2009 | 地学前缘2009，16，S1： | 0 |
| 10 | Natural Red Earth as a Material for Arsenic Removal in Drinking Water显示文摘Arsenic,a carcinogenic substance,occurs in surface and subsurface waters through natural and anthropogenic activities.It is estimated that nearly 100 million people inhabiting several countries are at a potential risk of arsenic exposure,and several thousands have already been affected by chronic arsenicosis.Therefore,there is a pressing need to develop a low cost and technically effective arsenic removal technology.While the | Meththika Vithanage Rohana Chandrajith Rohan Weerasooriya | 2009 | 地学前缘2009，16，S1： | 0 |
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