不同灌溉水平下气象因子对草地早熟禾蒸散量的影响

Effect of meteorological factors on evapotranspiration of Kentucky bluegrass(Poa pratensis L.),under different irrigation levels

[目的]研究不同灌溉水平下气象因子对草地早熟禾蒸散量的影响。[方法]以田间持水量为标准,用称重法控制土壤含水量并测量草地早熟禾蒸散量,利用Watchdog气象仪记录实时气象数据,研究在不同灌溉水平下草地早熟禾蒸散量及其动态,并研究草地早熟禾蒸散量与气象因子的关系。[结果]充分灌溉条件下草地早熟禾的蒸散量明显大于限制灌溉;除了8月限制灌溉草地早熟禾日蒸散量呈双峰型外,其他草地早熟禾日蒸散量均呈单峰型,且峰值均出现在当天气温最高值之前;月蒸散量随太阳辐射和气温的减小而逐月减少。草地早熟禾蒸散量受太阳辐射和气温的影响最显著,与相对湿度呈负相关关系,与风速的正相关性较不显著。[结论]该研究为草地早熟禾的栽培提供科学依据。

[Objective] The research aimed to study the effect of meteorological factors on evapotranspiration of Kentucky bluegrass under different irrigation levels.[Method] Based on the standard of the field capacity,control soil moisture content using weighing method and measure the bluegrass evapotranspiration,meteorological data in real time was recorded using the watchdog instrument,Kentucky bluegrass evapotranspiration and its dynamics under different irrigation levels were measured in this paper,and the relationship between bluegrass evapotranspiration and meteorological factors was studied.[Result] Bluegrass evapotranspiration under the sufficient irrigation condition was significantly greater than the limited irrigation;all bluegrass daily evapotranspiration showed a single peak type except the August limited irrigation bluegrass daily evapotranspiration in double peak type,and the peak appears before the temperature arriving in the highest point;monthly evapotranspiration with solar radiation and air temperature decreases down month by month.The effect of solar radiation and temperature on bluegrass evapotranspiration is the most significant,the relative humidity is negatively correlated with evapotranspiration,positive correlation of wind speed is not obvious.[Conclusion] The study provides the scientific basis for the cropping of Kentucky bluegrass.