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Acta Prataculturae Sinica ›› 2015, Vol. 24 ›› Issue (6): 16-24.DOI: 10.11686/cyxb2014305

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Characteristics of precipitation interception in soil and water conservation forests of the Northeast black soil areas of China

SUI Yuan-Yuan1, 2, 3, XU Xiao-Hong2, ZHANG Yu2, OU Yang1, *, YAN Bai-Xing1, WANG Pei-Jiang2, CUI Hai-Feng2, CUI Bin2   

  1. 1.Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
    2.Soil and Water Conservation Research Institute of Jilin Province, Changchun 130033, China;
    3.Graduate University of Chinese Academy of Science, Beijing 100049, China
  • Received:2014-07-03 Online:2015-06-20 Published:2015-06-20

Abstract: A study of forests for soil and water conservation has been undertaken to learn the effect of canopy interception on water circle, allocation and utilization in the Northeast black soil areas of China. Field monitoring data was used to investigate precipitation interception in two forest types [Larix gmelinii (LG) and Quercus mongolica-Larix gmelinii (QM-LG)] in the Xingmu small watershed of Dongliao County, Jilin Province. During the 15 rainfalls from May to September 2013, throughfall accounted for 72.0% and 67.4% of LG and QM-LG total precipitation respectively. Stemflow made up 2.6% and 2.7% of total rainfall and 25.3% and 29.8% of interception respectively. Interception percentages in the two forests varied from 8.9% to 73.5%. Compared with LG, QM-LG had higher interception efficiency. 8 rainfall events generated surface runoff for LG at 3.52 mm and QM-LG at 3.40 mm. Monthly throughfall and interception in the two forests ranked as August>July>June>May>September, and stemflow as July>August>June>May>September. Monthly interception percentages in the two forests were the highest in September (44.5% and 49.0%) and the lowest in July (20.4% and 25.2%). Throughfall, stemflow and interception had significant linear associations with total rainfall. Stemflow increased slightly with light rain and more significantly when rainfall was above 30 mm. Interception percentages gradually decreased with increases in precipitation. Throughfall in LG and QM-LG was significantly positively correlated with rainfall intensity. Stemflow and rainfall intensity could be fitted with logarithmic curve. However, the relationship between rainfall intensity and interception or interception percentage was not significant. The interception percentage of the two forests was more than 50% when rainfall intensity was equal to or less than 2.65 mm/h.