春玉米适宜土壤水分下限动态指标的确定  

Dynamic Indexes of Water-saving Irrigation Based on Maize Growth Characteristics

作　　者：侯琼 李建军 王海梅 云文丽 

机构地区：[1]内蒙古气象科学研究所,呼和浩特010051 [2]内蒙古巴彦淖尔市农业气象试验站,内蒙古临河015000

出　　处：《灌溉排水学报》2015年第6期1-5,34,共6页Journal of Irrigation and Drainage

基　　金：国家公益性行业(气象)科研专项(GYHY201206021)

摘　　要：利用田间水分试验和气象观测资料,通过相关和回归分析,研究了春玉米7个发育时段土壤水分适宜下限(田间持水率的百分比)指标和计划湿润层深度,基于发育进程和积温原理,构建了全生育期土壤水分下限指标和计划湿润层深度动态计算方法。结果表明,对于土壤水分下限和相应的土层,播种—三叶期分别为田间持水率的70%和0~20cm,三叶—七叶期分别为田间持水率的55%和0~30cm,七叶—拔节期分别为田间持水率的60%和0~50cm,拔节—抽雄期分别为田间持水率的70%和0~70cm,抽雄—抽雄后20d分别为田间持水率的75%和0~100cm,抽雄后20d-乳熟期分别为田间持水率的65%和0~100cm,乳熟—成熟期则分别为田间持水率的60%和0~70cm。土壤水分下限指标和计划湿润层深度动态方程的相关指数均在0.95以上。Based on the field moisture tests and ground meteorological data, correlation and regression anal- ysis methods were used to study the soil moistures of different soil layers and the lowest suitable soil mois ture limit indexes in 7 growth periods of spring maize. Based on the development and accumulated tempera- ture principle, the calculation methods of the lowest suitable soil moisture limit indexes and the soil mois- ture of different soil layers in the whole growth periods were determined. The results showed that the low- est suitable soil moisture limit indexes and soil layers were 70% of field capacity and 0~20 cm in sowing~ three-leaf stage, 55% of field capacity and 0~30 cm in three-leaf stage--seven-leaf stage, 60~ of field ca- pacity and 0~50 cm in seven-leaf stage-jointing, 70% of field capacity and 0~70 cm in jointing^tassel ing, 75% of field capacity and 0~100 cm in tasseling20 days after tasseling, 65% of field capacity and 0~100 cm in 20 days after tasseling^milk stage, 60G of field capacity and 0~70 cm in milk stage^matu- rity. Based on the correlation and regression analysis, the related indexes were all above 0.95.

关 键 词：土壤水分下限 动态指标 春玉米 节水灌溉 

分 类 号：S513[农业科学—作物学]