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Wind-induced hydrodynamic changes impact on sediment resuspension for large, shallow Lake Taihu, China

International Journal of Sediment Research 2019年第3期34卷 205-215页

作者： Abdul Jalil Yiping Li Ke Zhang Xiaomeng Gao Wencai Wang hafiz osama sarwar khan Baozhu Pan Salar Ali Kumud Acharya State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education Hohai University College of Environment Hohai University Laboratory Base of Eco-hydraulic Engineering in Arid Area Xi'an University of Technology Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Division of Hydrologic Sciences Desert Research Institute

The internal sediment release is a key factor controlling eutrophication processes in large, shallow *** resuspension is associated with the wave and current induced shear stress in large, shallow lakes. The current study investigated the wind field impacts on sediment resuspension from the bottom at Meiliang Bay of large, shallow Lake Taihu. The impacts of the wind field on the wave, current, and wave-current combined shear stresses were calculated. The critical wind speed range was 4–6 m/s after which wave and current shear stress started to increase abruptly, and onshore wind directions were found to be mainly responsible for greater shear stress at the bottom of Lake Taihu. A second order polynomial fitting correlation was found between wave(R20.4756) and current(R20.4466) shear stresses with wind speed. Wave shear stress accounted for 92.5% of the total shear stress at Meiliang *** critical wave shear stress and critical total shear stress were 0.13 N/m2 for sediment resuspension whereas the current shear stress was 0.019 N/m~2 after which suspended sediment concentrations(SSC)increased abruptly. A second order polynomial fitting correlation was found between wave(R20.739),current(R20.6264), and total shear stress(R20.7394) with SSC concentrations at Meiliang Bay of Lake Taihu. The sediment resuspension rate was 120 to 738 g/m~2/d during 4–6 m/s onshore winds while offshore winds contributed Z 200 g/m~2/d. The study results reveal the driving mechanism for understanding the role of the wind field in sediment resuspension while considering wind speed and direction as control parameters to define wave and current shear stresses.

关键词： Shear stress Sediment resuspension Lake Taihu Hydrodynamics Wind field

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Termites Improve the Horizontal Movement of Carbonized Particles:A Step towards Sustainable Utilization of Biochar

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Phyton-International Journal of Experimental Botany 2022年第10期91卷 2235-2248页

作者： Mazhar Ali Nasir Masood hafiz Muhammad Rashad Javeed Ibrahim Al-Ashkar Khalid F.Almutairi Liyun Liu Muhammad Aqeel sarwar Karthika Rajendran Ayman EL Sabagh Department of Environmental Sciences COMSATS University IslamabadVehari CampusVehari61100Pakistan Department of Plant Production College of Food and AgricultureKing Saud UniversityRiyadh11451Saudi Arabia Graduate School of Integrated Sciences for Life Hiroshima UniversityHiroshima739-8528Japan Crop Sciences Institute National Agricultural Research CentreIslamabad44000Pakistan VIT School of Agricultural Innovations and Advanced Learning(VAIAL) Vellore Institute of Technology(VIT)Vellore632014India Department of Agronomy Faculty of AgricultureKafrelsheikh UniversityKafr El-Shaikh33516Egypt

Soil amendments containing carbonized materials increase the soil carbon reservoir,influence plant productivity,and,ultimately,help to clean the *** is data on the effect of such additions on soil physicochemical properties or plant growth,but few studies have focused on how these carbonized materials are distributed by termite species in the soil *** is the first comprehensive study of the transportation of biochar(BC)by termite species under tropical environmental conditions in *** present study was carried out to test the hypothesis that if termite species I)were involved in the distribution of biochar particles II)if yes,then how far these particles were transported during the study period(10 days)and III)check their preference between the enriched BC(EBC)and non-enriched *** was enriched with the cattle slurry after its pyrolysis in the *** results showed that EBC particles were significantly more widely distributed than non-enriched BC particles,but both types of BC were transported more than 4 cm(ring 4)within 10 days(at the end of the experiment).The current study also revealed that EBC was easily attached to the setae,cuticle,and legs of termites,implying that it could potentially be transported over a greater ***,transportation of EBC over larger distances indicated a potential preference of termite species between the EBC and BC *** the study,however,the preference among the termite species was also *** the prevailing study conditions,the Coptotermes heimi and Heteroterme indicola species transported the EBC further than Microtermes obesi and Odontotermes *** findings revealed that transportation preferences were observed among the four termite *** conclusion,the current study found that termites were involved in the distribution of BC particles,with a preference for EBC and that these have the potential to transport BC particles more than 4 cm within 10 da

关键词： Enriched biochar termite species distribution micro-particles feeding stations soil productivity

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