Preface Introduction Summary Part One:The Soils Chapter Ⅰ The General Situations of Nature,Society and Economy 1．The Natural Conditions 2．The General Situations of Society and Economy Chapter Ⅱ The Formations,Developments and Desertifications of Soils 1．The Soil For mation Processes 2．The Characteristics of Soil Development 3．The Desertification of Soils Chapter Ⅲ The Generality of Soil Classification System and Soil Types 1．The Classification System of Soils 2．The Generality of Soil Types Chapter Ⅳ The Soil Background Value of Chemical Elements and the Soil Microorganisms 1．The Soil Background Value of Chemical Elements 2．The Soil Microorganisms Part Two:The Land Resources Chapter V The Land Types and the Land Resources 1．The Land Types 2．The Land Resources Chapter Ⅵ The History of Land Exploitation and the Formation and Evolution of the Oases 1．The History of Land Exploitation 2．The Formation and Evolution of the Oases Chapter Ⅶ The Influence of Exploitation of Land Resources on the Ecological Environment and the Measures for Utilization and Preservation 1．The Assessment of The Influence of Exploitation of Land Resources on the Ecological Environment 2．The Measures for the Reasonable Utilization of Land Resources and Preservation of Ecological Environment Chapter Ⅷ The Human Population Bearing Capacity of Land Resources 1．The Conceptions,Studying Methods and the Characteristics of the System in Study Areas 2．The Analysis of the Systematic Feedback Mechanism and the Model Construction 3．The Evolution Trends and Goals of the System 4．The Countermeasures to the System
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