Nitrogen Loads in Leaching Waters of Soils in Different Lands under the Conditions of Natural Rains in Dachong Watershed in Yun-Gui Plateau of PRC

Abstract:

It is crucial to understand the nitrogen output loads in leaching water of soils in different lands controlling non-point source pollution. Leaching water collecting devices were installed in soils of 7 kinds of typical land use types in a representative watershed to collect water samples and evaluate output loads of TN, nitrate nitrogen, and ammonium nitrogen under the conditions of natural rains. Results showed that concentration of TN, nitrate nitrogen, and ammonium nitrogen in leaching water from vegetable fields and slope croplands were significantly higher than those from other lands. The concentration of these three indexes in leaching water from rice fields was lowest during the whole growing period except for seedling establishment and tillering stages among slope croplands, terraced fields and paddy fields. With the growth of crops and increasing depth of soils, different-typed nitrogen concentration in leaching water from different lands gradually decreased. Slope croplands, terraced lands and secondary evergreen broadleaf forests generated high output loads of nitrogen pollutants but rice fields and vegetable fields not due to less leaching water and open forests and sugiki forests not due to low nitrogen concentration in leaching waters. On the average, the output loads of TN, nitrate nitrogen, and ammonium nitrogen were 179.764 kg•ha-1，103.645 kg•ha-1 and 7.431kg• ha-1 in the watershed. The study revealed the intensity of nitrogen pollution from different land uses in typical watershed of Yun-Gui plateau.

• Periodical: Advanced Materials Research (Volumes 573-574)
• Pages: 552-559
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.573-574.552
• Online since: October 2012
• Authors: Zhen Hong Wang, Chang Min Xu
• Keywords: Ammonium Nitrogen, Nitrate Nitrogen, Nitrogen Leaching, Nitrogen Output, TN, Typical Agriculture Watershed, Water Pollution

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