聚水集肥、带松茬种少耕法的水分利用效应

Water Use Efficiency of Reduced Tillage with “Strip Loosing and Stub Sowing” and “Water Nutrient Collecting”

围绕对冀北高原高寒半干旱区降水资源的高效利用，对多年定位的土壤耕作试验进行了分析。结果表明，耕层土壤沟垄构型，配合垄下覆膜，带松茬种，利用微域径流聚水与集中施肥，使土体形成水、肥、气的局部富集带，此聚水集肥、带松茬种耕作法使作物产量较传统耕作提高２２．７７％～２８．３６％，２ｍ土体水分利用效率提高１４．８％～９０．０％，并使周年水分保持了正平衡。

In order to significantly increase the use efficiency of precipitation resource in the frigid and semi arid plateau region of north part of Hebei, this paper ana lysed the soil tillage experiments for several years. The results showed that furrow ridge configuration with film multch under the ridge,strip loosing and stub sowing could form local collection strips of water,nutrients and air using the micro area runoff water collection and concentration fertilizering. This tillage method could increase the crop yield by 22.77%～28.36% compared with the conventional, increase the water use effciency in 2m depth of soil by 14.8%～90.0% and keep the annual soil water in positive balance.