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根据大量野外实测资料,研究位于科尔沁沙地南缘的不同利用方式下4个样地(受破坏的沙质草场D1、紧牧的优势沙生草甸子地C3、紧牧半流动沙地A3、紧牧固定沙地F3)在植被生长期内(5—9月)的裸地土壤凝结水变化规律。结果表明:①主凝结现象均发生在日落至次日日出期间,而日出至日落期间均发生主蒸发现象;②连通的MLS测出的凝结量均大于不连通的MLS测出的凝结量;③A3和F3的旬平均凝结量均大于C3和D1的旬平均凝结量,即沙地的凝结量大于草地的凝结量;④研究区4个样地5—9月的月平均凝结量分别为:1.04 mm、0.84 mm、0.63 mm,0.61 mm、0.59 mm,凝结量总体呈下降趋势。研究成果对沙地的生态保护具有一定的指导作用。
According to a large number of field data, the four plots under different utilization patterns (the damaged sandy grassland D1, the dominant desert sand meadow sub-region C3, the tight-grazing semi-floating sandy land A3, the tight juncture sandstone meadow A3 located on the southern margin of Horqin sandy land Fixed grazing land F3) Changes of soil condensation water in bare land during vegetation growth period (May-September). The results showed as follows: (1) The primary coagulation occurred both during the sunrise and the next sunrise, and during the sunrise and sunset all the main evaporation occurred. (2) The measured coagulation volume of the connected MLS was greater than that of the MLS ; ③A3 and F3 ten days average coagulation amount is greater than the average condensate amount of C3 and D1 ten days, that is, the coagulation amount of sandy land is greater than that of grassland; ④ The average monthly mean clotting amount of the four plots from May to September in the study area is : 1.04 mm, 0.84 mm, 0.63 mm, 0.61 mm, 0.59 mm, the overall amount of condensation showed a downward trend. The research results have certain guidance to the ecological protection of sandy land.