黄土高原旱作春玉米农田能量交换变化研究  

On energy exchange of dry-land spring maize field in loess plateau

作　　者：郭家选[1] 李巧珍[2] 李玉中[2] 

机构地区：[1]农业应用新技术北京市重点实验室北京农学院植物科学技术学院,北京102206 [2]中国农业科学院农业环境与可持续发展研究所,北京100081

出　　处：《北京农学院学报》2012年第1期1-5,共5页Journal of Beijing University of Agriculture

基　　金：国家科技支撑项目(2011BAD32B03);国家自然科学基金项目(31040006);北京市教育委员会科研水平提高经费资助(5076016010)

摘　　要：为了研究旱作春玉米蒸散耗热的变化规律,采用涡度相关技术监测并分析黄土高原东部常规旱作春玉米农田能量交换传输特征。结果表明,非降雨天气情况下,逐日正午(12:00—14:00)时间段内旱作春玉米农田能量平衡比值主要介于0.75～1.0范围内,整个生育期内波文比值呈"L"型变化趋势,春玉米苗期波文比值最高,阶段平均值为4.85±1.42;蒸发比值呈单峰型变化趋势,在降水较多的8月蒸发比值较高,平均值为0.55±0.06;全生育期内波文比值和蒸发比值平均值分别为1.78±1.71和0.40±0.18。旱作农田生态系统地表获取的可供能量有40%左右用于蒸散耗热。To explore the mechanism for changes of evapotranspiration and heat consumption in drought-resistant spring maize, the eddy covariance technique was used to monitor the energy-exchange characteristics of the crop in ＂Eastern Loess Plateau＂ field. The results showed that the field-energy-balance ratio of drought-resistant spring maize fell into the range of 0.75-1.0 during non-rainfall daily noon （12： 00- 14：00）. The Bowen ratio exhibited ＂L-type＂ trend during the entire growth stages, namely, the highest Bowen ratio was at seedling stage with phase average 4. 85±1.42. The evaporation ratio showed a single peak trend in August, and the higher evaporation ratio met with more precipitation with average values 0.55±0.06. The Bowen ratio and average evaporation ratio at the entire growth period were 1.78±1.71 and 0. 40±0.18, respectively. About 40% of surface energy obtained from drought agro-ecosystem was used for evapotranspiration and heat consumption.

关 键 词：旱作春玉米 波文比值 蒸发比值 涡度相关法 

分 类 号：P425.23[天文地球—大气科学及气象学] S513[农业科学—作物学]