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Identification of anthropogenic parameters for a regional nitrogen balance model via field investigation of six ecosystems in China
Liu C.; Wang Q. X.; Lei A.; Yang Y. H.; Ouyang Z.; Lin Y. M.; Li Y.; Wang K. L.
Source PublicationBiogeochemistry
2009
Volume94
Issue2
Pages175-190
KeywordEcosystem Field Investigation Nitrogen Flow Food Intake Farming Method North-atlantic Ocean Tai Lake Region United-states Northeastern Usa Changjiang River Budgets Agroecosystems Watersheds Future
AbstractTo 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 a parts per thousand currency sign 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.
Indexed BySCI
Language英语
ISSN0168-2563
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/23515
Collection历年回溯文献
Recommended Citation
GB/T 7714
Liu C.,Wang Q. X.,Lei A.,et al. Identification of anthropogenic parameters for a regional nitrogen balance model via field investigation of six ecosystems in China. 2009.
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