| Modeling Biogeochemistry,the Key for Understanding Environmental Chemistry of a Semi－Arid Soil in Egypt |
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| 作者姓名： | Ahmed A. Melegy |
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| 作者单位： | Department of |
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| 基金项目： | ThisworkwasfundedbytheAcademyofScientificResearchandTechnologyinEgyptandtheNationalResearchCentre ,Cairo ,Egypt. |
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| 摘 要： | 1IntroductionThecomponentsoftheenvironmentaredamagedbyagriculturalpractices.Soilslosstheirfer tilityandwaterdeterioratesduetopollution .Chemicalweatheringofmineralandsoiloccursattheinterfacesbetweentheliquidandsolidphases;consequentlythesurfaceareaandcompositionofthemineralsplayanimportantroleinthisprocess.GarrelsandMackenzie ( 1 96 7)suggestedthatincon gruentweatheringreactionswouldproducedissolvedspeciesandnewsolidsthataremorestableintheweatheringenvironmentthantheoriginalbedrockminerals.Ro…
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| 关 键 词： | 生物地球化学 环境化学 埃及 土壤 植被 大气 水文学 环境监测 侵蚀速率 变性土 |
| 收稿时间： | 19 December 2004 |
Modeling biogeochemistry,the key for understanding environmental chemistry of a Semi-Arid soil in Egypt |
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| Ahmed A. Melegy.Modeling biogeochemistry,the key for understanding environmental chemistry of a Semi-Arid soil in Egypt[J].Chinese Journal of Geochemistry,2003,22(2):150-155. |
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| Authors: | Email author" target="_blank">Ahmed?A?MelegyEmail author |
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| Institution: | (1) Department of Geological and Geophysical Sciences, National Research Centre, Dokki, Cairo, Egypt |
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| Abstract: | Modeling geochemistry of the studied Bahtim catchment in Egypt provides a powerful tool for untangling various connections
and feedbacks between atmospheric inputs, vegetation, soil and hydrology within the system. The biogeochemical PROFILE model
was used to study the integrated environmental monitoring of different environmental compartments as well as calculating geochemical
weathering rate. The model is in steady state and includes multi-layers which have the mineralogical, physical and chemical
attributes measured for individual soil layers. In this study, the base cations (Ca2+, Mg2+, Na+, K+) are produced from the minerals through chemical weathering. The total chemical weathering rate of base cations is 6.5 keq-1. ha-1. a-1. In addition, the output results indicate that a small amount of dark minerals like hornblende, pyroxene and plagioclase
largely contribute the field weathering rate in Egyptian Vertisols.
This work was funded by the Academy of Scientific Research and Technology in Egypt and the National Research Centre, Cairo,
Egypt. |
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| Keywords: | monitoring biogeochemistry PROFILE model chemical weathering Egypt Vertisols |
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