关键词: 沙漠人工植被区, 微型蒸渗仪, 大型称重式蒸渗仪, TDR, 蒸发

Abstract: The experiment based on Micro-Lysimeter combining with Lysimeter and TDR aims to determine the evaporation in Artemisia ordosica and Caragana korshinskii re-vegetated desert area during growth season of 2003 and in bare desert. The results showed that soil evaporation has no relation with overshadow of plant due to thin vegetation. Evaporation amount between A. ordosica and C. korshinskii vegetation is different, but the interaction between locations and vegetations is not significant. As precision is concerned, we suggest that soil in Micro-Lysimeter should be frequently exchanged and the probe of TDR should be inserted vertically instead of horizontally. Most evaporation occurs after precipitation in desert area. Based on the results of Micro-Lysimeter combing with the result of Lysimeter, the evaporations in bare sand and A. ordosica and C. korshinskii vegetated areas are calculated, they are 111.6 mm and 93.8 mm and 99.3 mm in experimental periods, respectively. The evaporation of A. ordosica and C. korshinskii vegetated areas are 45.1% and 43.6% of the evapotranspiration. Monthly, the maximum evaporation of A. ordosica and C. korshinskii vegetation is 0.93 mm·d^-1 and 1.10 mm·d^-1 in August respectively, the minimum evaporation is 0.30 mm·d^-1 and 0.28 mm·d^-1 in May respectively.

Key words: artificially re-vegetated desert area, Micro-Lysimeter, Lysimeter, TDR, evaporation