桂林地区绿化草坪灌溉制度关键参数研究

Study on Key Parameters of Green Lawn Irrigation System in Guilin

耗水试验是获取绿化草坪灌溉制度关键参数的重要手段,对绿化草坪灌溉、工程设计具有重要指导意义。在桂林市农田灌溉试验中心站开展绿化草坪耗水试验,采用智墒仪ET100进行土壤体积含水率实时监测,以水量平衡法计算耗水量和耗水强度。结果表明:(1)10cm土层在绿化草坪耗水中占主导地位,20cm土层灌水5d后才开始提升耗水;在灌水后12d内无降雨的整个阶段,前10d都是由0~20cm土层直接向绿化草坪供水,30~90cm土层水分向上迁移,补充0~20cm土层水分的消耗;第11d开始,30~40cm土层开始加入直接供水;100cm土层整个12d内都没有发生水分明显变化。(2)绿化草坪的主要根系集中在10cm深度,因此,绿化草坪的适宜灌溉深度应设定在0~20cm。(3)绿化草坪高温生长旺盛的季节每次灌水间隔天数为7d或8d,低温生长受限季节每次灌水间隔天数为10~12d。

Water consumption test is an important means to obtain key parameters of green lawn irrigation system.The results have important guiding significance for green lawn irrigation and engineering design.Water consumption test of green lawn was carried out at Guilin Farmland Irrigation Test Center Station. Soil volumetric water content was monitored in real time by intelligent soil moisture meter ET100. Water consumption and water consumption intensity were calculated by water balance method.The results showed that:(1)10 cm soil layer was dominant in the water consumption of green lawn, and 20 cm soil layer began to increase water consumption after 5 days of irrigation. The first 10 days of the whole 12 days without rain, 0 to 20 cm soil layer directly supplied water to the green lawn, 30 to 90 cm deep soil moved up to supplement water consumption of 0 to 20cm soil layer, 30 to 40 cm soil layer began to join direct water supply from the 11th day, 100 cm soil layer did not change significantly throughout the 12 days.(2) The main roots of green lawn were concentrated at 10 cm depth, so the suitable irrigation depth of green lawn should be set at 0 to 20 cm.(3) The interval of irrigation were 7 days or 8 days in vigorous growth season with high temperature of green lawn, and 10 to 12 days in the growth limition season with low temperature.