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

日本和中国的科学家正计划对中国半干旱地区的水和二氧化碳循环进行全面的合作研究。为了开展这项合作研究，冈山大学和京都大学的科学家于1992年7月14日至24日访问了中国，并考察了位于山东普罗登斯的玉城实验站。禹城站位于华北平原冲积区，历史上干旱、内涝、洪涝、土壤盐渍化等自然灾害频繁发生。我们与中国科学家就合作研究中应考虑的关键因素进行了讨论，并在平等互利的原则下达成了以下共识：水平衡组成部分的方法；水循环的物理过程；流域的水平衡；作物的蒸发蒸腾和耗水量；土壤盐分和碱的动态与土壤水分运动的关系；作物对环境因子的响应；遥感这项合作研究有助于两国气象学、植物生理学和水文学的发展，也有助于两国科学家的交流。该合作项目将由中国科学院、地理研究所等中国部属研究所和以冈山大学为代表的日本文部科学省等日本部属研究所共同开展。所有相关科学家都真诚地希望这一合作计划能够在不久的将来顺利实施。

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.