论文部分内容阅读
选择甘肃黄土高原旱作区5个春小麦测站2m土层深度多年土壤贮水量与产量资料,从大气降水-土壤水-作物循环系统的理论出发,研究了土壤贮水量和农田耗水量对春小麦水分生产力的影响.结果表明:该区域是一个贮水和保水性能较好的天然土壤水库,干旱区、半干旱区、半湿润区2m土层最大贮水量分别达470mm、582mm和617mm,但实际贮水量只有190mm、230mm和370mm,实际贮水量只相当于最大贮水量的40%、40%和60%,总的趋势是随湿润度增加而增大.干旱区、半干旱区和半湿润区分别为春小麦全生育期2m土层农田实际耗水量153mm、175mm和323mm,有随湿润度增大而增加的趋势.土壤贮水量是该区域春小麦生产力最重要的因素,土壤水分籽粒生产力为0.24～1.0kg.mm-1,平均为0.67kg.mm-1,总生物产量生产力为1.41kg.mm-1,随干旱程度增加明显递减.对不同水分气候区要采取增加土壤水库库容的各种抗旱措施,以提高土壤贮水量的利用效率.
Based on the data of soil water storage and yield of 2m soil depths at 5 spring wheat stations in arid area of Gansu Loess Plateau, from the theory of atmospheric precipitation - soil water - crop circulation system, the effects of soil water storage and farmland water consumption on water content Productivity.The results show that this area is a natural soil reservoir with good water storage and water holding capacity and the maximum water storage capacity of 2m in arid, semi-arid and semi-humid areas is 470mm, 582mm and 617mm respectively, but the actual storage The water volume is only 190mm, 230mm and 370mm, the actual water storage capacity is only equivalent to 40%, 40% and 60% of the maximum water storage capacity, the general trend is to increase with the increase of wetness.Arid area, semi-arid area and semi-humid area respectively The actual water consumption of spring wheat with 2m soil layer during the whole growing period was 153mm, 175mm and 323mm, which increased with the increasing of wettability.The soil water storage capacity was the most important factor of spring wheat productivity in this region, and the soil water productivity was 0.24-1.0 kg.mm-1, with an average of 0.67kg.mm-1, the total productivity of the biological productivity of 1.41kg.mm-1, with the increase of the degree of drought decreased significantly.For different moisture climatic zones to take to increase soil reservoir storage capacity of the various anti- Dry measures to improve soil water use efficiency.