黑龙江省农田土壤蓄水量盈亏状况的垂直变化规律研究

Study on the vertical distribution-pattern of farm land soil water storage capacity surplus-deficit status in Heilongjiang Province

以农田土壤水分实测资料为基础 ,依据农田土壤水分常数与作物生长发育的关系创建了土壤蓄水量盈亏值指标。选择 3个典型站点研究黑龙江省农田土壤水分盈亏状况的垂直变化规律 ,结果为 :海伦从表层到 5 0 cm各个土层均为盈余 ,而且随深度的增加盈余先增加后下降 ,2 0 cm处为最高值 ;泰来的土壤水分从表层到 30 cm为增加 ,之后又下降 ,而且以 2 0 cm为界将盈余区与亏缺区划分开 ;总平均来看 ,宝清土壤水分随深度呈减少趋势 ,盈余减小 。

This paper created the index of soil water storage capacity surplus-deficit status on the basis of the relationship between the sail moisture constants and the growth of crop based on the field real data.The three selected stations were used to analyse the vertical distribution-pattern of soil water storage capacity surplus-deficit status with soil depth.The resulted showed that in every layer form surface to the depth of 50cm soil water storage capacity surplus status first rised and then dropped in Hailun,and that in Tailai soil water storage capacity from surface to the depth of 30cm rised with depth and then dropped,and the depth of 20cm was the boundery used to differentiate the surplus and the deficit,and that in Baoqing,on the average,soil water storage capacity tended to drop with depth and the deficit increased while the surplus decreased.$$$$