, Volume 94, Issue 2, pp 175–190 | Cite as

Identification of anthropogenic parameters for a regional nitrogen balance model via field investigation of six ecosystems in China

  • Chen Liu
  • Qinxue Wang
  • Alin Lei
  • Yonghui Yang
  • Zhu Ouyang
  • Yaoming Lin
  • Yan Li
  • Kelin Wang


To evaluate the impact of human behavior (with regard food consumption, waste disposal and farming method) on nitrogen flow, a field investigation was conducted in six typical ecosystems in China. A number of parameters for regional nitrogen balance models were identified during the investigation. The results show that the average per-capita daily protein intake is 107 g. While there is an insignificant difference in total protein intake among the different ecosystems, protein intake from all food groups, except for eggs, is significantly different (P ≤ 0.05). Differences in diet, along with those in socio-economic conditions, reflect differences in the characteristics of the ecosystems. Regarding per-capita annual potential nitrogen loading from human excrement, a considerable difference exists between the urban rich and the rural poor. In urban areas, approximately 1.02 kg N is returned to farmlands and 5.49 kg N is directly discharged into rivers. In rural regions, on the other hand, approximately 4.33 kg N is returned to farmlands and 1.60 kg N is directly discharged into rivers. Furthermore, urea and mixed fertilizers constitute the most common chemical fertilizers in the study area. Fertilizer diversification is practiced in a range of agricultural lands, paddy-fields and irrigated plains. In the oasis and paddy-field agricultural systems, many of the agricultural by-products (e.g., straw) are burned or mixed with base-fertilizers and plowed into the soil. In irrigated agricultural systems, over 70% of agricultural by-products are recycled as livestock feed. In most instances, livestock excrement is directly reduced in the pasturelands or reused in the fields as manure. Occasionally, as in the case of large-scale breeding, excrements are usually abandoned.


Ecosystem Field investigation Nitrogen flow Food intake Farming method 



We duly acknowledge the support of the Development of Systems for Evaluating Regional Water and Material Cycles East Asia Project of the National Institute for Environmental Studies, Japan; and the Establishment of Early Detection Network of Global Warming Impacts Project, Ministry of Environment, Japan. We are also grateful to Dr. J. P. Moiwo for reviewing the manuscript.


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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Chen Liu
    • 1
  • Qinxue Wang
    • 1
  • Alin Lei
    • 2
  • Yonghui Yang
    • 3
  • Zhu Ouyang
    • 4
  • Yaoming Lin
    • 4
  • Yan Li
    • 5
  • Kelin Wang
    • 6
  1. 1.Asian Environmental Research Group, National Institute for Environmental StudiesTsukubaJapan
  2. 2.Changjiang Water Resources Protection Institute, Changjiang Water Resources CommissionWuhanChina
  3. 3.Center for Agricultural Resources Research, Institute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuangChina
  4. 4.Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
  5. 5.Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqiChina
  6. 6.Institute of Subtropical AgricultureChinese Academy of SciencesChangshaChina

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