EARTH AND ENVIRONMENT
Vol. 41, No.3, Tot No.293 2013

CONTENTS
Research Results

Drainage Network Distribution and Its Master Natural Factors in Guizhou Province………………………………………………………………………CHEN Wei-yan et al（193）
Analysis of Daily Rainfall Concentration and Its Change Characteristics in Southwestern Karst Regions-A Case Study of Wujiang Catchment……………………………………………………………………………………………………………………………………………………………HUANG Xiao-ya et al（203）
Spatial Distribution of Heavy Metals in Groundwater from the Piedmont to Coastal Areas in the North China Plain………………………………………………………………………………………………………………………………………………………………………QIAO Xiao-hui et al（209)
Effects of Simulated Nitrogen Deposition and Elevated CO2 Concentration on Soil Organic Carbon and Nitrogen of Deyeuxia Angustifolia Community on the Sanjiang Plain……………………………………………………………………………………………………………………………………………………………………ZHANG Ji-zhou et al（216）
Soils of Guangxi Beibu Coast Gulf Economic Zone…………………………………………………………………………………………………………………………LI Jie et al（226）
The Comparative Study of Heavy Metal Contamination Between the Nile Delta and the Yangtze Delta………………………………………………………GU Jia-wei et al（233）
Dissolution of Kaolinite Induced by Citric Acids,Oxalic Acids and Malic Acids in HAC￣NH4AC Buffer Solution…………………………………………HU Hua-feng et al（242）
Sedimentary Facies Features of the Sangonghe Formation in Well Field Xiayan11 in the Junggar Basin…………………………………………………LING Xiang et al（251）
Geochemical Characteristics of Atmospheric Particulate Matter from Baiyin City, Gansu Province………………………………………………………………HE Ling et al（258）

Applied Study

Application of Flow Calculation of Debris Flow in Control Engineering by GIS Technology and MATLAB—A Case Study of the Su Bao River in Beichuan County……………………………………………………………………………………………………………………………………………………………………YANG Yang et al（266）
Preliminary Assessment on Contamination and Potential Ecological Risk of Thallium in Cultivated Soils around the Ni-Mo Mining Area in Songlin, Zunyi………………………………………………………………………………………………………………………………………………………………………JIN Zhao-gui et al（274）
Concentration and Spatial Distribution Characters of the Rare￣Earth Elements in Soils in Maotai, Guizhou Province…………………………………JIANG Tao et al（281）
The Sediment P inactivation Efficiency of Modified Zeolite…………………………………………………………………………………………………YANG Yong-qiong et al（288）
Study on Eeological Suitability of Green Tea Garden in Guizhou Province……………………………………………………………………………………WU Ke-hua et al（296）
Study on the Topsoil Carbon Reserves of Guanzhong Region……………………………………………………………………………………………WANG Ming-xia et al（303）
Assessment on Spatial and Temporal Distribution Characteristics of Ecological Risk of Heavy Metals in Sediments of Lake Dianchi and Its Major Tributarie…………………………………………………………………………………………………………………………………………………………………YU Ya-juan et al（311）
Comparative Analysis of Grade￣standard Deviation Method and Factors Analysis Method for Environmental Sensitive Factor Analysis…………………………………………………………………………………………………………………………………………………………………CHEN Qiao et al（319）
Overview of the Research on Transfer and Transform Behavior of Thallium on the Interface between Mineral and Natural Organic Matter…………………………………………………………………………………………………………………………………………………………………………LIU Juan et al（326）