农田黑土水分调节能力分析

Analysis on water-adjustment capacity of black soil in the farmland.

农田黑土区土壤水分对作物生育期间水分需求起到调节作用,农田黑土水分调节能力的大小取决于大气降水和作物生育阶段对水分的需求,土壤水分调节主要在作物生育前期,土壤水分调节量占作物耗水量的70％,而0～100cm土层占总土壤水分调节量的80％。春小麦、大豆耗水高峰期在生育中期和后期,其生育后期水分来源主要靠大气降水;玉米耗水高峰期在生育中期,其水分来源也主要靠大气降水。

Water-adjustment of black soil in the farmland has a function to adjust crop water-demand during their growing stage. Water-adjustment capacity of black soil in the farmland is determined both by rainfall and water de-mand of crops during their growing stage. Time of water-adjustment by the soil mainly occurs in early stage of crop growing. Amount of water-adjustment by the soil accounts for 70% of crop water-consumption. A depth of water-adjustment by the soil is from 0 to 100cm,accounting for 80% of the total. The peak water-consumption stage of spring wheat and soybean is in the middle and late growth periods, and water-consumption mainly depends on rainfall. The peak water-consumption stage of corn is in the middle growth periods, and water-consumption mainly depends on rainfall too.