科尔沁沙地不同生境土壤凝结水的试验研究

2007年8月采用称量法研究了科尔沁沙地4种生境（流动沙地、固定沙地、农田和樟子松林）土壤凝结水形成的时间以及凝结水的数量.结果表明：20:00—22:00间，研究区土壤凝结水开始逐渐形成，22:00—4:00时段的土壤凝结水波动增大，4:00之后土壤凝结水开始逐渐蒸发损失；科尔沁沙地4种生境0～9 cm土层是土壤凝结水的主要形成层，其中，0～3 cm土层所占比例最大，约占总凝结水量的40%，9～30 cm土层仍有凝结水形成，但凝结水量较少；4种生境0～3 cm土层的凝结水量在时间上存在较大差异，0～3 cm土层日均凝结水量大小依次为固定沙地>流动沙地>农田>樟子松林，说明植被条件较好的生境反而不利于土壤凝结水的形成；0～30 cm土层日均凝结水量以固定沙地最多（约0.172 mm），以农田最少（为0.110 mm），流动沙地和樟子松林地分别为0.120和0.128 mm.

Soil condensation water in different habitats in Horqin sandy land: An experimental study

Weighing method was adopted to study the formation time and the amount
 of soil condensation water in four habitats (mobile sandy land, fixed sandy lan
d, farmland, and Mongolian pine forest land) in Horqin Sandy Land in August 2007
. The soil condensation water began to form at 20:00〖KG-*2〗-〖KG-*7〗22:00, in
creased gradually at 22:00〖KG-*2〗-〖KG-*7〗4:00, and began to evaporate after
4:00. In the four habitats, soil c
ondensation water was mainly formed in 0〖KG-*2〗-〖KG-*7〗9 cm layer, and the a
mount was the greatest in 0〖KG-*2〗-〖KG-*7〗3 cm layer, accounting for 40% of
the total. The soil condensation water also formed in 9〖KG-*2〗-〖KG-*7〗30 cm layer, but in ver
y small amount. There was a greater difference in the mean daily amount of soil condensation wate
r in 0〖KG-*2〗-〖KG-*7〗3 cm layer in the four habitats, with the sequence of f
ixed sandy land > mobile sandy land > farmland > Mongolian pine forest land, which indicated that
 the habitat with better vegetation condition was not benefit the formation of s
oil condensation water. The mean daily amount of soil condensation water in 0〖KG-*2〗-〖KG-*7〗3
0 cm layer was 0172 mm in fixed sandy land, 0128 mm in Mongolian pine forest
 land, 0120 mm in mobile sandy land, and 0110 mm in farmland.