新疆干旱区田间水利用系数影响因素分析

Analysis of influence factor of field water utilization coefficient in Xin Jiang arid region

依据新疆干旱区砂土地测坑小区的实测资料,对灌水定额、计划湿润层深度与田间水利用系数进行多因子相关分析,建立回归模型。结果表明:田间水利用系数与灌水定额负相关,与计划湿润层深度正相关,且与计划湿润层深度相关性较大,三者关系可用二元回归模型描述。该研究结果说明在作物灌溉制度的制定中,不应统一采用作物需水高峰期的有效湿润层深度作为计划湿润层深度进行计算灌水定额。根据作物不同生育期有效湿润层深度来确定灌水定额,可有效提高田间水利用率。

Based on data of the leaching-pond experiment, this papercarried out multiple factor correla- tion analysis to irrigation quota, wetting layer depth and field water utilization coefficient, and established a regression model. The results showed that the field water utilization coefficient is negative correlation and with irrigation quota, and is positive correlation with the depth of planning-wetting. The relationship be- tween the three can be described by bivariate regression model. The results insicated that it is not necessa- ry to use the effective wetting layer depth of crop water requirement in peak period as the plan wetting lay- er to calculate the irrigation quota. Using the effective wetting layer depth in different period of crop grouth to calculate irrigation quota can effectively improve the utilization rate of field water.