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Main content area

Effects of soil moisture content on upland nitrogen loss

Author:
Ouyang, Wei, Xu, Xueting, Hao, Zengchao, Gao, Xiang
Source:
Journal of hydrology 2017 v.546 pp. 71-80
ISSN:
0022-1694
Subject:
Soil and Water Assessment Tool model, highlands, nitrogen, pollution, runoff, soil water content
Abstract:
In recent years, nitrogen (N) loss from upland fields has become one of the most important sources for agricultural nonpoint source (NPS) pollution. Understanding the relationships between soil hydrological processes and N loss in NPS pollution is vital for controlling the agricultural NPS pollution in upland fields. The objective of this study was to analyze the interaction of N loss with different moisture conditions in the freeze-thaw zone. The semi-distributed hydrologic model Soil and Water Assessment Tool (SWAT) was used in this study to simulate runoff and different forms of N loss, which provided a basis for analyzing characteristics of N loss in the study region. Results showed that the soil moisture content was an important factor affecting N loss in the study region. Different forms of N loss were also analyzed and it was found that N loss occurred primarily in the form of organic-N, which is likely due to the dominant role of erosion-induced pollution. This study provides useful information for preventing NPS pollution within the study region.
Agid:
5609899