Modeling Biogeochemistry, the Key for Understanding Environmental Chemistry of a Semi-Arid Soil in Egypt

作     者：Ahmed A. Melegy 

作者机构：Department of Geological and Geophysical Sciences National Research CentreDokki 

出 版 物：《Chinese Journal Of Geochemistry》 (中国地球化学学报)

年 卷 期：2003年第22卷第2期

页      面：150-155页

核心收录：

学科分类：083001[工学-环境科学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：ThisworkwasfundedbytheAcademyofScientificResearchandTechnologyinEgyptandtheNationalResearchCentre  Cairo  Egypt 

主　　题：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 

摘      要：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 (Ca+{2+}, Mg+{2+}, 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.