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为了解淮河流域农田下垫面光合有效辐射的基本特征,分析淮河流域农作物生长的光、热条件,笔者利用寿县国家气候观象台(32°30.83′N,116°46.47′E)2008年全年太阳辐射观测资料,采用30min平均,按照线性关系y=cx做最小二乘拟合,得到PAR、RS以及PAR/Rs的日、月和季节均值,分析了该地区光合有效辐射(PAR)的日、季、年变化特征及所占太阳短波辐射(Rs)比例的一些基本特征,得出了该地区的光合有效辐射(PAR)的年总量为1970.8MJ/m2,春、夏、秋、冬季的平均日总量分别为:6.83MJ/m2、6.58MJ/m2、4.28MJ/m2、3.80MJ/m2;得出月平均PAR/Rs的值在0.37～0.43之间,最大值出现在夏季为0.43,最小值出现在冬季为0.37,年平均值为0.40;分析晴天和阴天日PAR的变化有明显的区别,阴天日PAR/Rs的值比晴天日明天偏大,全年典型阴天日PAR/Rs的值为0.42,典型晴天日PAR/Rs的值的为0.39。对于PAR/Rs,云、水汽、太阳阳辐射强度以及大气浑浊度对其都有影响。
In order to understand the basic characteristics of photosynthetically active radiation on the underlying surface of farmland in the Huaihe River Basin and to analyze the light and heat conditions for crop growth in the Huaihe River Basin, the author uses the Shouxian National Climate Observatory (32 ° 30.83’N, 116 ° 46.47’E) Solar radiation observation data, using 30min average, according to the linear relationship y = cx least square fitting, get PAR, RS and PAR / Rs daily, monthly and seasonal mean analysis of the region of photosynthetically active radiation (PAR) of the day The results showed that the annual total photosynthetic active radiation (PAR) was 1970.8MJ / m2, spring, summer, autumn and winter The average daily total amount was 6.83MJ / m 2, 6.58MJ / m 2, 4.28MJ / m 2 and 3.80MJ / m 2, respectively. The monthly mean PAR / Rs was between 0.37 and 0.43, 0.43 and the minimum value was 0.37 in winter and the annual average was 0.40. There were significant differences in the changes of PAR between sunny days and cloudy days. On the cloudy days, the values of PAR / Rs were larger than that of sunny days and the typical cloudy days The daily PAR / Rs value is 0.42 and the typical sunny day PAR / Rs value is 0.39. For PAR / Rs, cloud, water vapor, solar radiation intensity and atmospheric opacity affect it.