论文部分内容阅读
在河西走廊的黑河流域中心试验站进行了秸秆覆盖免耕(NTS)储水灌溉对春小麦耗水特征及灌溉水分利用效率影响的试验研究。结果表明:①就春小麦全生育期耗水情况来看,NTS并没有减少土壤水分的消耗,只使春小麦的耗水在时间和空间上有所改变;②NTS的全生育期日均耗水量最高,而全年的日均耗水量最低,这主要是由NTS在休闲期时明显的保墒作用所导致;③为获取高产和提高灌溉水分利用效率,耕作方式为NTS且冬季储水定额为1 200m3.hm-2的处理是最优的;④随着储水定额的增大,全生育期和全年的日均耗水量增大,而灌溉水分利用效率递减。若仅仅为提高节水效率和灌溉水分利用效率可以将冬季储水定额减少到750m3.hm-2。
The experimental study on the effect of NTS irrigation on water consumption characteristics and water use efficiency of spring wheat in the Heihe River Basin Central Experimental Station of Hexi Corridor was conducted. The results showed that: (1) NTS did not reduce the soil water consumption, but only changed the water consumption of spring wheat in time and space; (2) The daily average water consumption of NTS was the highest during the whole growing period The average daily water consumption was the lowest during the whole year, which was mainly caused by the obvious effect of soil moisture conservation during NTS. (3) In order to obtain high yield and improve irrigation water use efficiency, the cultivation method was NTS and the winter water storage quota was 1 200m3.hm -2 is the best; ④ With the increase of water storage quotient, the average daily water consumption during the whole growth period and the whole year increases, while the water use efficiency of irrigation decreases. If just to improve water conservation efficiency and irrigation water use efficiency can reduce the winter water quota to 750m3.hm-2.