[1]LIU Quan,LI Zhanbin,LI Peng,et al.Characteristics of Ammonium Nitrogen (NH4+-N) Loss from Slope Lands with Different Vegetation Cover/Patterns Under Simulated Rainfall[J].Research of Soil and Water Conservation,2017,24(01):75-78.
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Characteristics of Ammonium Nitrogen (NH4+-N) Loss from Slope Lands with Different Vegetation Cover/Patterns Under Simulated Rainfall
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 01
Page number:
75-78
Column:
Public date:
2017-02-28
- Title:
- Characteristics of Ammonium Nitrogen (NH4+-N) Loss from Slope Lands with Different Vegetation Cover/Patterns Under Simulated Rainfall
- CLC:
- S157.1;S153;P333
- DOI:
- -
- Abstract:
- Although the government has taken various measures to control nitrogen pollution on cropland, large loss of nitrogen along with runoff and sediment is one of primary source of agricultural non-point source pollution. Three types of vegetation coverage (25%, 50% and 75%) including nine vegetation patterns were selected for examining the loss processes of NH4+-N along with runoff and sediment on the 21° slope land under indoor simulated rainfall condition. The results show that the critical period of controlling runoff and sediment losses is the early runoff stage (ERS). The pattern of NH4+-N loss is not obvious when vegetation coverage is 25%, the amounts of NH4+-N loss through runoff and sediment in the middle runoff stage and late runoff stage accounted for 71.2%～82.8% of total losses when vegetation cover is 50%. As for controlling NH4+-N loss, the ERS is the best period when vegetation cover is 75%. The relationship between runoff and NH4+-N loss by runoff (RAN) follows the power function, and runoff is significantly positive correlated with RAN (p < 0.05). The relationship between sediment and NH4+-N loss by sediment (SAN) can be described by power function, and sediment and NH4+-N loss are highly significant and positive correlated (p < 0.01). With respect to three vegetation patterns, the reduction capacity on runoff, sediment and NH4+-N loss decreases in the order: lower patterns > upper patterns > middle patterns.
- References:
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1900-01-01