Water resource is one of the most important natural resources that mankind depends on for survival and development， and one of the controlling factors of the ecology and environment. Global water use has been growing at more than twice the rate of population growth in the last century. Moreover， the water scarcity situation is being exacerbated by climate change， especially in the driest areas of the world. Agriculture consumes about 70 percent of all freshwater withdrawn and up to 95 percent in several developing countries. To tackle water scarcity even as the demand for food increases， we must support initiatives to improve water conservation and delivery systems， protect the earths ecosystems， conserve rain-fed moisture and use water for food production more efficiently， or produce more food with proportionately less water. Coping with water scarcity requires addressing a range of issues， not all of them directly linked to agricu- lture. They range from protection of the environment and global warming to fair pricing of water services and equitable distribution of water .for irrigation， industry and household use. This is why not only the agriculture sector， but everyone， international organizations， governments and local communities must share the responsibility.
Preface Section Ⅰ Water Resources and Water Crisis in China:an Overview The Connotation and Extension of Agricultural Water Resources Security The Shortage, Pollution and Management of China's Water Resources Section Ⅱ Application of Chemical Water-saving Materials in Agriculture Degraded Lands and Hydrogels: From an Ecological Catastrophe to Economical Profit The Principle Mechanisms of Action and the Application of Super Absorbent Polymers in Agricultural Production Section Ⅲ New Materials and New Technologies Preparation and Characterization of Nanocomposite Films from Chitin Whisker and Waterborne Poly (ester-urethane) with or without UltraSonification Treatment Effects of Ultra-Sonification Assisting Polyethylene Glycol Pre-Treatment on the Crystallinity and Accessibility of Cellulose Fiber Section Ⅳ The Effect of Water-saving Chemical Materials in Agriculture & Forestry Water Potential Preliminary Study of Superabsorbents and Mineral/polymer Hybrid Superabsorbents The Effects of Super-absorbent Polymers on the Ponding Infiltration Characteristics of Soil Water Effect of a Water-Retaining Agent on Photosynthesis and Water Utilization at Different Growth Stages of Winter Wheat Effects of PAM on Aggregate Distributions and Stabilities of Three Types of Soils in the Loess Plateau, China Analysis of the Economically Efficient Quantity of a Water Retention Agent in Agricultural Production and Factors Affecting Demand The Effect of Super Absorbent Polymers on the Growth and Yield Performance of Cotton in Xinjiang, China Section Ⅴ Related Studies on Water Use & Drought Adaptive Mechanisms for Drought and the Improvement of Crop Yields in the Arid Xinjiang Area of China Ecophysiological Strategies for Improving Wheat Water Use in Semi-Arid China Divisions of seasonal droughts in hilly areas of southern China Streamfiow Simulation over the Yellow River Basin using Two Different Resolution of the LRM with RIEMS Contributing Authors
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