亚热带红壤丘陵区水稻田净全辐射初探

对中国科学院千烟洲试验站水稻田与气象站的辐射观测数据进行初步分析结果表明，我国亚热带红壤丘陵区水稻田净全辐射和太阳总辐射最高值出现在地方时的1100～1300，日出后和日落前1h左右通过0点；夜间总辐射为0W/m

Analysis of the net radiation on paddy fields in red earth hilly region of China

This study was conducted in Qianyanzhou Experiment Station of the Chinese Academ y of Sciences,which is located in typical red earth hilly region of south China.The net radiation and the global solar radiation on the paddy fields and the meteorological observation site in the station have been respectively measured every one hour by using the automatic meteorological observing system.The result s show that both the net radiation and the global radiation for the paddy fields reach the peak point at 11:00～13:00 in local time normally,and pass the zero po int separately at the time of about one hour behind sunrise and ahead of sundown,and that the global radiation is zero during night,and the net radiation varies bet ween 0～-100W/m2.It is evident from the data analysis that there exist obvious linear correlation between the net radiation and the total radiation on the padd y fields and the meteorological observation site.Accordingly we can employ the g lobal radiation and the net radiation of the meteorological station for simulati ng the corresponding data of the paddy fields.And it was also found that there w as an obvious annual variation for the net radiation on the paddy fields and the meteorological observation site.The variation is in keeping with the annual cha nge of solar radiation,the maximum value emerges in July,the minimum in December at the paddy fields and in January at the meteorological observation site ,and the net radiation is positive value at both the two test sites.