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Investigation of the Potential and Mechanism of Clove for Mitigating Airborne Particulate Matter Emission from Stationary Sources

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Journal of Bionic Engineering 2017年第2期14卷 390-400页

作者： Jin Tong Xin Liu Ronaldo Maghirang Kaiqi Wei Linna Liu Chun Wang Yunhai Ma Donghui Chen Hongjia Yan Li Guo Key Laboratory of Bionic Engineering (Ministry of Education of China) Jilin University Changchun 130022 China College of Biological and Agricultural Engineering Jilin University Changchun 130022 China Department of Biological and Agricultural Engineering Kansas State University Manhattan KS 66506 USA Institute of Military Veterinary Academy of Military Medical Sciences Changchun 130122 China Department of Planning and Construction Jilin Agricultural University Changchun 130118 China

vegetative barriers （VB） have the potential to mitigate air pollutants emitted from area sources, including concentrated Animal Feeding Operations （AFOs）. However, the mechanism has not been fully investigated, thereby limiting the application of vegetation systems in practice. An experimental method with repeatable and controllable conditions was developed to measure the change of Particulate Matter （PM） concentrations at upwind and downwind of VB in the wind tunnel and observe accumulated PM on leaves with Scanning Electron Microscope （SEM）, thus evaluating the ability of VB in mitigating PM emitted from AFOs. Branch-scale vegetation, clove （syzygium aromaticum） was selected because its leaves are one of the major factors affecting PM dispersion. The results show that the branch-scale barriers, as porous medium have the ability to interfere with airflow and reduce PM, which could be influenced by wind speed, particle size fraction and surface area density of clove. Moreover, clove elements could adjust to the wind and the micro structure of clove （such as the hierarchical structures of leaves） affected on the PM deposition. These results indicate that the methods developed in this study may be used to evaluate the potential of vegetation in mitigating PM from stationary sources, and some characteristics of vegetation can be further studied as bionic prototype for exploring engineering application of reducing particulates.

关键词： vegetative barrier particulate matter wind tunnel clove animal feeding operation

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Farming methods impact on soil and water conservation efficiency under tea[Camellia sinensis(L.)]plantation in Nilgiris of South India

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International Soil and Water Conservation Research 2016年第3期4卷 195-198页

作者： Dhruba Charan Sahoo Made Gowda Madhu Sivagnanam Santhana Bosu Om Pal Singh Khola Indian Institute of Soil and Water Conservation Research CenterSunabeda 763002OdishaIndia Tamil Nadu Agricultural University Agricultural Engineering College and Research InstituteCoimbatore 641003Tamil NaduIndia Indian Institute of Soil and Water Conservation Research CenterNilgiris 643004Tamil NaduIndia

Growing of tea on sloping land without any soil and water conservation measures causes enormous soil loss especially in the initial *** sound soil and water conservation planning,there is a need to evaluate the various conservation measures as related to the amount of expected runoff and soil *** this context,a field study was conducted in the farmer's field in Nigiris of South India for evaluating the impact of farming methods on soil and water conservation eficiency under new tea plantation One year old B-6 tea clones were planted at double hedge spacing(135 cm×75 cm×75 cm)in two slopes(8-12%and 30-35%)with treatments viz,contour staggered trenches(CST),vegetative barrier(VB),CST alternate with VB,CST with cover crop of beans and farmers'practice of *** runoff(14.6%)was observed from CST with cover crop of beans followed by CST(15.4%)under 8-12%slope range with exactly similar trend in runoff from the plots under 30-35%*** to runof,minimum soil loss was observed from CST(4.9 and 6.9t ha^(-1)yr^(-1))fllowed by CST with cover crop of beans(5.3 and 73 t ha^(-1)yr^(-1))under 8-12%and 30-35%*** CST and CST with cover crop of beans are resulted in better soil moisture under both the slope ranges in comparison to remaining measures as well as farmers'practice of ***,either CST alone or in combination with cover crop of beans are recommended for soil and water conservation under new tea plantation in the hill slopes.

关键词： Contour staggered trenches Conservation efficiency Cover crop vegetative barrier

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