论文部分内容阅读
通过5年的定点定位试验观测,分析结果表明,砂田具有良好的蓄水保墒特性,在一般年有效降水不低于200mm时,砂田能够基本满足抗旱作物生长需水的要求,新、中、老砂田含水量分别是土田的2.2倍、1.84倍和1.53倍;砂田可使土壤表层水分蒸发量不超过1.2mm/天,而对照土田则为5～10mm/天;砂田还具有提高地温的作用,通常高于土田6℃以上,并能使土壤结冻期比土田推迟约20天,解冻期提前约15天;砂田还可有效地防止风蚀和水蚀,具有保水保土保肥的作用。因此,砂田农作物产量是土田的1～3倍。
Through 5 years of fixed-point positioning experiment, the results show that the sandy land has good characteristics of water storage and soil conservation. When the annual average effective precipitation is not less than 200mm, the sandy land can basically meet the requirements of drought-resistant crop growth and water demand. The new, middle and old The water content in the field is 2.2 times, 1.84 times and 1.53 times that of the soil field respectively. The amount of water evaporation in the surface of the field does not exceed 1.2mm / day, compared with 5 ~ 10mm / day in the control field. The field also has the effect of increasing the ground temperature, Usually higher than the soil above 6 ℃, and can make the soil freezing period than the soil delayed about 20 days, thawing period about 15 days ahead of schedule; Sandy field can also effectively prevent wind erosion and water erosion, with soil conservation and fertilizer. Therefore, the production of sand fields is 1 to 3 times the soil.