木麻黄防护林带对改善农田小气候效应的研究

Study on Improving the Effect of Crop Microclimate by Protection Forest Belt of Casuarina equisetifolia

通过对木麻黄防护林带庇护下的农田小气候进行定位观测,分析了木麻黄林带的防护功能,结果表明:木麻黄农田防护林带具有降低风速的作用,背风面20～100 m,风速比对照点降低27%～67%,且随着风速的增大,降低风速的效果越明显;林带对气温和地温具有调节作用,背风面各点白天增温,夜间降温;林带能够减小蒸发量,林带背风面20～100 m范围内日均蒸发量比对照点降低16.2%～24.2%.

By determining the position of crop microclimate protected by protection forest belt of Casuarina equisetifolia ,protective function of shelterbelt of Casuarina equisetifolia was analyzed.Results showed that shelterbelt of Casuarina equisetifolia had the function of reducing wind speed.The lee side was 20~100m,wind speed was reduced by 27%~67% than the check.The greater the wind speed was,the clearer the result of reducing wind speed was.Shelterbelt had the function of adjustment to air temperature and earth temperature.Every point of the lee side heat in daytime and reduce at night.Shelterbelt could reduce evaporation.Daily mean evaporation at the range of 20~100 m of the lee side of shelterbelt reduced 16.2%~24.2% than the check.