摘要
使用西安浐灞生态区2011年4—10月(世园会期间)光合有效辐射PAR及邻近气象站观测资料,应用气候统计方法分析探讨了该地的PAR、光合有效辐射系数ηQ的基本变化特征及形成原因。主要结论有:4—10月西安世园会址的PAR为5 095.2mol/m2,平均月、日总量分别为727.9mol/m2,23.8mol/(m2.d);PAR总量夏季大于春季,春季明显大于秋季,原因为罕见秋霖;PAR的日变化为中午大,早晚小,且春、夏季明显高于秋季,晴天日多为500～600mol/m2,阴天日多为200～300mol/m2。ηQ具有明显的月份和季节变化特征,拟合曲线呈双峰型,7月和10月为峰值月,5月和9月为谷值月;ηQ值夏季最大,秋季次之,春季最小;ηQ日变化特点为阴天日明显高于晴天日,二者平均相差0.47mol/MJ。最后提出了适合西安的ηQ气候学经验计算公式。
Using the observation data of Photosynthetically Active Radiation（PAR） and adjacent weather stations of an international horticultural expo address （Chanba） from April to October in 2011, and the application of statistical methods, the basic characteristics and the origins of those PAR and ηQ （Photosynthetic active radiation coefficient） data was analyzed. The results showed that from April to October in 2011, Xi＇an international horticultural EXPO address displayed 5 095.2 mol/m2 PAR, with a monthly and daily average sum of 727.9 mol/m2 , 23.8 mol/（m2 · d）, respectively. PAR sum was higher in summer than in spring, and it is greater in spring than in autumn due to the intensive autumn precipitation; the daily changes of PAR were bigger at noon, and smaller in the morning and evening. PAR in spring and summer were evidently higher than autumn, PAR in sunny days were often 500-600 mol/m2 , and it was always 200-300 mol/m^2 in cloudy days; ηQ had obvious monthly and seasonal variation characteristics. The fitted curve showed twinpeak type： July and October for peak months, May and September for valley months, ηQ value was maximum in summer, it ranked the second in autumn, and it was minimum in the spring; Daily-change characteristics of BQ indicated that cloudy days were clearly higher than sunny days, with an average difference of 0.47 mol/ MJ. Finally, the most suitable climatology experience formula for ηQ calculation in Cbanba Xi＇an was put forward.
出处
《水土保持研究》
CSCD
北大核心
2013年第1期260-263,268,共5页
Research of Soil and Water Conservation
基金
国家重大基础预研项目(2005CCA05300)
关键词
西安浐灞
生态区
光合有效辐射
光合有效辐射系数
气候学计算
Xi＇an international horticultural expo address （Chanba）
photosynthetic active radiation
photosynthetic active radiation coe{ficient
climatology calculation.
