灌溉对三种冷季型草坪草蒸散耗水的影响

对多年生黑麦草、草地早熟禾和高羊茅3种冷地型草坪草在生长季内不同水分处理下的蒸散量(ET)进行了田间测定,并对蒸散量与各种环境因子做了相关分析和逐步回归分析。结果表明,3种冷地型草坪草的蒸散量生长季内的变化趋势基本一致,但不同水分处理和不同草种的蒸散量不同;相关分析结果表明,土壤水分梯度为70%～90%田间持水量(FC)时,蒸散量主要由环境因子调节,而土壤水分为30%～50%FC时,蒸散作用受控于土壤水分。

Effect of irrigation quota on evapotranspiration of three cold-season turfgrass

Evapotranspiration (ET) of perennial ryegrass, Kentucky bluegrass and tall fescue at different moisture gradients in the whole experimental period in Beijing was measured　under field conditions, and the variation patterns of ET of these cold-season turfgrasses were studied. The results showed that different species had different water consumption pattern in the same water status. The relationship between ET and temperature, evaporation, rainfall and water gain under the condition of controlled soil water was analyzed. The results showed that meteorological factors influenced the ET, and the role of each factor was not lonely. There is a significant correlation between ET and environmental factor under 70%～90% of field capacity. When soil moisture was 30%～50% of field capacity, evapotranspiration was affected by soil moisture.