A comparative study of nutrient transfer via surface runoff from two small agricultural catchments in north China |
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Authors: | Haiming Lu Chengqing Yin Weidong Wang Baoqing Shan |
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Institution: | (1) Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing Road 18, Beijing, 100085, People’s Republic of China |
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Abstract: | A field study was conducted to determine the effect of landscape spatial pattern and micro-topography on nutrient transfer
via runoff from two catchments into Yuqiao Reservoir in north China. The surface runoff discharge was measured during rainfall
events and water samples were analyzed in 2004 and 2005. The mean annual total nitrogen (TN) and total phosphorus (TP) exports
per unit area from Caogezhuang catchment (C catchment) were 1.048 and 0.561 kg ha−1 year−1, respectively, while the TN and TP exports from Taohuasi catchment (T catchment) were 0.158 and 0.027 kg ha−1 year−1. In both catchments, village and vineyard shared the highest nutrient export ability due to the accumulated animal waste
and heavy application of fertilizer and manure. In T catchment, the distance of village and vineyard was about 1,500 m away
from the receiving water and in between were woodland and cropland. In the hydrological pathway, there were sink landscape
structures of small stone dams, roadside swale, vegetated filter strip and dry ponds, which could detain water and nutrients.
In C catchment, the distance between the village and the receiving water was about 200 m, and the hydrological pathway was
compacted roads and ditches with no sink structures. It is suggested that the distance between the pollution source area and
the receiving water and the micro-topographical features were the main factors to control the great difference in nutrient
export rates. |
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Keywords: | Agricultural catchment Landscape spatial pattern Micro-topography Nutrient transfer Surface runoff |
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