Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (9): 1206-1213.doi: 10.19741/j.issn.1673-4831.2018.0724

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Nitrogen Budgets Characteristics of Different Land Use Patterns in a Small Catchment.

WANG Huan-xiao1, WANG Xiao-yan1,2, DU Yi1, LI Yu-xin1   

  1. 1. College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China;
    2. Research Center of Aquatic Environment in the Capital Region, Capital Normal University, Beijing 100048, China
  • Received:2018-11-09 Published:2019-09-21

Abstract: Taking land use as the research unit, nitrogen budget of different land use in Sheyuchuan small catchment was studied on the basis of actual survey. Input, output and surplus of nitrogen in different land use were estimated to discuss the sources and route of nitrogen cycle in this small catchment. Results show that, the breeding area had the highest intensity of nitrogen input and output, and the ecological forest had the lowest; the input intensity of economic forest was three times that of cultivated land. Fertilizer was the main nitrogen input in economic forest and cultivated land, which organic fertilizer in economic forest accounting for 83.32%, while chemical fertilizer was the main input in cultivated land accounting for 56.44%, which resulted in fertilizer application loss as the main output source. The main input source of ecological forest was nitrogen fixation accounting for 70.05%, and the output was mainly natural. Nitrogen in residential and breeding areas were mainly based on food and feed inputs. Nitrogen in all land use types in the catchment was surplus, while the difference in surplus intensity of different land use types was obvious. Among them, the breeding area (4 795.15 kg·hm-2) and economic forest (493.72 kg·hm-2) have the highest surplus intensity, followed by cultivated land (139.13 kg·hm-2). Ecological forest (77.17 kg·hm-2) and residential area (68.52 kg·hm-2) have the lowest surplus intensity. The results imply that reducing fertilization, controlling fertilizer loss and strengthening nitrogen management in livestock and poultry systems are the focuses of nitrogen management in this catchment.

Key words: nitrogen balance budget, land use, unit surplus of nitrogen, Sheyuchuan small catchment

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