关键词: 土壤凝结水, 野外试验, 变化规律, 微型蒸渗仪

Abstract: The change law of soil condensation water was studied in four sample fields in southern Horqin Sand Land during the vegetation growth stage (May to September). The four sample fields are D1—destroyed sandy pasture, C3—enclosed superior sandy meadow, A3—enclosed semi-shifting sand land, and F3—enclosed fixed sand land. The results show: ①most soil water condensation occurred during period from sunset to sunrise of the next day, and most evaporation occurred during period from sunrise to sunset; ②the condensation water in connected MLS (micro-lysimeter) is more than that in not-connected MLS; ③the average condensation of ten days in A3 and F3 is larger than that in C3 and D1; ④the monthly average condensation amount in the four sample fields from May to September is: 1.04 mm, 0.84 mm, 0.63 mm,0.61 mm, and 0.59 mm, showing a general descending trend. The research results have certain guiding role in sandy land ecological protection.

Key words: soil condensation water, field test, change law, micro-lysimeter (MLS)