干旱区生态环境知识资源中心

Dew is a crucial factor in the water cycle in a wetland ecosystem. This study aims to investigate the dewfall in the Carex lasiocarpa marsh in the Sanjiang Plain. The experiment was performed during the growing season from mid-May to mid-October in 2008 and 2009. Dew formation was monitored using wood sticks. The results indicate that dew events occurred during 70% to 80% of the rainless nights during the research period. The dew intensity reached its peak in August in both years. A statistics analysis shows that the dew intensity in July and September of 2009 was significantly lower than that in 2008 because of the significantly higher relative humidity during that year. However, the annual dewfall was almost the same, at the amount of 8.76 and 8.38 mm in 2008 and 2009, respectively. The Carex lasiocarpa marsh is an important site for dew deposition.