The Study of Water and Carbon Dioxide Circulation over Semi-Arid Fields in China

日本科学家和中国正在计划对中国半干旱地区的水和二氧化碳循环进行综合合作研究。为了确保这次合作研究，冈山大学和京都大学的科学家于1992年7月14日至24日拜访了中国，并视察了位于山东普罗维登斯的雨城实验站。禹城站位于中国平原北部冲积区，历史上干旱、内涝、洪涝、土壤盐碱化等自然灾害频繁发生。我们与中国科学家讨论了合作研究中需要考虑的关键因素，同意在平等互利的原则下解决以下问题：水平衡组成的方法水循环的物理过程流域水平衡作物蒸发蒸腾和耗水土壤盐碱动态与土壤水分运动作物对环境因素的响应遥感解译蒸散量、土壤水分含量和作物生长引进新品种和新技术以提高产量这次合作研究有助于两国气象、植物生理和水文学的发展以及两国科学家的交流。合作项目将由中国科学院下属的研究所开展中国的地理研究所等部委，以及以冈山大学为代表的日本文部科学省等部门的研究所。所有相关的科学家都真诚地希望这次合作项目在不久的将来能够顺利实施。

Scientists in Japan and China are planning the comprehensive cooperative study about water and carbon dioxide circulation over semiarid fields in China. To make sure this cooperative study, scientists of Okayama University and Kyoto University visited China from July 14 to 24, 1992, and inspected the Yucheng Experimental Station situated in the Shantung Providence. The Yucheng Station is located in the alluvial part of North China Plain where the natural disasters such as drought, water logging, flooding and soil salinization frequently occurred in the history. We discussed with chinese scientists about Key factors to be considered in our cooperative study We arrived agreement that following problems should be solved under the principle of equality and mutual benefit :Methodology for components of water balancePhysical process of water circulationWater balance of catchmentEvapotranspiration and water consumption by cropsDynamics of salts and alkalis within soil in relation to soil water movementResponse of crops to environmental factorsRemote sensing for interpretation of evapotranspiration, soil water content and crop growthIntroduction of new varieties and techniques for higher productivityThis cooperative study contributes to development of meteorology, plant physiology and hydrology of both countries as well as interchange of scientists between two countries.The cooperative program will be conducted by the institutes under the Chinese Academy of Sciences, Institute of Geography and other ministries in China, and the institutes under Japanese Ministry of Education, Culture and Science and other ministries in Japan represented by Okayama University. All of the related scientists sincerely want this cooperative program will be executed smoothly in near future.