兰新线黑山湖段地下滴灌与沟灌条件下防护林树种生长比较试验

Comparison on the Growth of Windbreaks Under Drip-irrigation and Ditch Irrigation in Heishanhu Section of Lanxin Railway

嘉峪关黑山湖防沙工区铁路沿线防风固沙林杨树和灌木柳的地下滴灌和沟灌试验结果表明:杨树、灌木柳地下滴灌灌水定额为6135m3/(hm2·a),一次性定额灌水为306 75m3。与传统沟灌相比,地下滴灌比沟灌年节约用水9883 28m3,节省率为61 7%;年节省用电7667 8kWh,节省率为61 7%。在地下滴灌条件下,平茬的灌木柳年平均高生长1 75m,冠幅为1 54m×1 62m,而平茬的灌木柳在沟灌条件下年平均高生长仅1 03m,冠幅为0 78m×0 69m。在地下滴灌条件下,杨树年平均高生长为0 44m,胸径增大0 40cm;而沟灌的杨树年平均高生长为-0 24m,胸径增大0 02cm。

The trials on the growth of Populus and bush-willows windbreaks under drip-irrigation and traditional ditch irrigation were conducted in Heishanhu section of Lanxin railway. The results show: the irrigation quota of Populus and bush-willows with drip-irrigation is 6 135 m^3/ha/year and the quota for one time is 306.75 m^3. Comparing with traditional ditch irrigation, 9 883.28 m^3 of water can be saved annually with the saving rate of 61.7% and 7667.8 degree of electricity can be saved annually with the saving rate of 61.7%, through using drip-irrigation. Under drip-irrigation, bush-willow with parallel cut can grow 1.75 m high annually with the crown of 1.54 m×1.62 m; Populus can grow 0.44 m high and its diameter increases by 0.4 cm. While under ditch irrigation, bush-willow can only grow 1.03 m high annually with the crown of 0.78 m×0.69 m; Populus can grow -0.24 m high and its diameter increases by 0.02 cm.