【摘要】 根据对屯留试验区旱地冬小麦农田水分的系统观测和分析研究,得出农田水分动态的时间变化和垂直分布的基本规律和特征值。其农田水分具有周年恢复、明显的干湿变化和季节性干旱、活动层次深厚、土壤水分库容量大等特点,从土壤—植物—大气系统水分亏缺的年变化和分布规律分析,生育期水分供需的极不协调,特别是生育关键时期的天气干旱和土壤水分的亏缺,则是影响冬小麦生长发育的主要限制因素。更多还原

【Abstract】 The basic law and the characteristic value of time changes and vertical distributionof soil moisture dynamics have been worked out based on the systematical field moistureobservation and analysis or winter wheat in rainfed lands in Tunliu Experimental Areas.The moisture is characterized with annual recovery, apparent wet and dry variations, sea-sonal droughts, deeply active profile and large amount of soil moisture reservoir. Themoisture deficit distribution of soil-plant-atmosphere continue suggests that there be anuneven coordination between moisture supply and demand, and that, especially, theweather drought and soil moisture deficit in the critical developing stage be the importantconstraint affecting crop growth. Also, the feasible ways of improving soil moisture con-ditions are suggested in this paper.更多还原