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

日本冈山大学和中国地理研究所的科学家们计划共同研究中国半干旱地区的水和二氧化碳循环。该项目的研究成果有助于两国微气象学和作物生理学的发展。目前的方案是综合合作实验的初步阶段，可能在不久的将来被接受。今年，三位日本科学家于1990年5月30日至6月14日访问了中国地理研究所，并视察了位于沙东省的禹城实验站实验田。这块地的面积是5公里× 5公里。1990年10月1日至15日，一位科学家访问了冈山大学。他参加了在冈山大学举行的实地实验和研讨会。我们讨论了研究课题。以下科学问题将通过合作实验解决。(1)半干旱区能量收支。(2)农田上空水汽输送机理。(3)利用遥感技术估算作物田间水分分布。(4)半干旱区蒸发与水分平衡观测研究。(5)半干旱区主要作物需水量及节水灌溉技术研究。(6)平流条件下Km/Kh观测研究。(7)农田上空二氧化碳运移机制。(8)半干旱区二氧化碳通量和二氧化碳收支观测研究。(9)半干旱区大气边界层数值研究。

The scientists of Okayama University in Japan and Institute of Geography in China have planned to make a joint effort on The Study of Water and Carbon Dioxide Circulation over Semi-Arid Fields in China. The results of this program contribute to development of micrometeorology and crop physiology of both countries.The present program is a preliminary stage of the comprehensive cooperative experiment that may be accepted in near future. In this year, three Japanese scientists visited the Institute of Geography in China from May 30 to June 14 in 1990, and inspected the experimental field of Yucheng Experimental Station situated in the Shatung Province. The field has an area of 5km x 5km. One scientist visited Okayama University from October 1 to 15 in 1990. He joined to the field experiment and workshop held in Okayama University. We discussed about research subjects. Following scientific problems will be solved by the cooperative experiment.(1) Energy budget over semi-arid field.(2) Transport mechanisms of water vapor over crop field.(3) Water distribution over crop field estimated by a remote sensing technique.(4) Observational study of evaporation and water balance in semi-arid fields.(5) Study on water requirement and techniques of water-saving irrigation for main crops in semi-arid fields.(6) Observational study of Km/Kh under advective conditions.(7) Transport mechanisms of carbon dioxide over crop field.(8) Observational study of carbon dioxide flux and carbon dioxide budget in semi-arid fields.(9) Numerical study of atmospheric boundary layer over semi-arid fields.