Chu Jun, Jin Meijuan, Tong Sichun, et al. Effects of Canopy Rainfall Redistribution on Surface Runoff and Leaching in Poplar-Wheat Intercropping System[J]. Bulletin of Soiland Water Conservation, 2020, 40(2): 69-76.
DOI:
Chu Jun, Jin Meijuan, Tong Sichun, et al. Effects of Canopy Rainfall Redistribution on Surface Runoff and Leaching in Poplar-Wheat Intercropping System[J]. Bulletin of Soiland Water Conservation, 2020, 40(2): 69-76. DOI: 10.13961/j.cnki.stbctb.2020.02.010.
Effects of Canopy Rainfall Redistribution on Surface Runoff and Leaching in Poplar-Wheat Intercropping System
[Objective] The effects of canopy rainfall redistribution on surface runoff
erosion and leaching in poplar forests were discussed
in order to provide a theoretical basis for reducing soil erosion in agroforestry systems.[Methods] Taking the poplar-wheat intercropping system in Taihu Lake basin as the research object
the surface runoff
erosion and leaching were measured and analyzed
based on the field observation of rainfall
throughfall and stem flow of 101 rainfall events in 2013.[Results] ① The total rainfall was 943.5 mm.The throughfall
stem flow and interception were 796.2 mm
7.3 mm and 140.0 mm
respectively
accounting for 84.4%
0.8% and 14.8% of the total precipitation. The small and medium-sized rainfall which was less than 10 mm occurred most frequently
accounting for 80.2% of the total rainfall events. ② Throughfall and stem flow were correlated with rainfall outside the forest (R2=0.993
R2=0.748 4). The stem flow started when the rainfall was greater than 5.5 mm. A negative function correlation existed between the rate of canopy interception and rainfall (R2=0.414 7). In addition to rainfall
the rate of canopy interception was also related to canopy leaf area index. ③ The higher the intercropping system stand density
the greater the canopy leaf area index
and the stronger the effects of canopy layer on surface runoff and erosion. ④ The average throughfall at 1.5 m from the trunk of a single poplar was reduced by 3.2% and 9.3% respectively compared with that at 0.5 m and 7.5 m
and the leached water decreased by 3.5% and 10.8% respectively. Besides
canopy structure played an important role in leaching loss.[Conclusion] ① The redistribution effect of poplar canopy on rainfall in intercropping system mainly depended on rainfall. The greater the rainfall is
the less significant the interception effect is. ② The increase of poplar intercropping can significantly reduce the surface runoff and erosion in the system. ③ The canopy of a single poplar tree at 1.5 m from the stem has the greatest effect on rainfall reduction and the least amount of leaching.
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Simulation Study of Characteristics of Runoff and Sediment Yield in the Hill Area with Purple Soils
Runoff ,Soil Erosion and Sediment Yield on Sloping Land of Red Soils Derived from Granite on Slopes with Different Landuses in South China
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Related Institution
CAS Key Laboratory of Forest;Ecology and Silviculture, Institute of Applied Ecology, Chinese Academy of Sciences , Shengyang
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National Permanent Scientific Research Base on Shelter forest in Nenjiang Plain, Heilongjiang Songnen;Plain Farmland Shelterbelt Ecosystem Observation and Research Station, Qiqihar Branch of Heilongjiang;Academy of Forestry
Forestry Science Institute of Hubei Province
College of Soil and Water Conservation, Beijing Forestry University