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global and Regional Surface Nitrogen Balances in Intensive Agricultural Production Systems for the Period 1970-2030

Pedosphere 2005年第2期15卷 137-155页

作者： A. F. BOUWMAN g.van drecht K. W. van der HOEK Netherlands Environmental Assessment Agency Netherlands Environmental Assessment AgencyLaboratory for Environmental Monitoring National Institute for Public Health and the EnvironmentP .O. Box 13720 BA Bilthoven (The Netherlands)National Institute for Public Health and the EnvironmentP .O. Box 13720 BA Bilthoven (The Netherlands)National Institute for Public Health and the EnvironmentP. O. Box 13720 BA Bilthoven (The Netherlands)

global nitrogen (N) budgets for intensive agricultural systems were compiled for a 0.5 by 0.5 degree resolution. These budgets include N inputs (N fertilizer, animal manure, biological N fixation and atmospheric N deposition) and outputs (N removal from the field in harvested crops and grass and grass consumption by grazing animals, ammonia volatilization,denitrification and leaching). Data for the historical years 1970 and 1995 and a projection for 2030 were used to study changes in the recovery of N and the different loss terms for intensive agricultural systems. The results indicate that the overall system N recovery and fertilizer use efficiency slowly increased in the industrialized countries between 1970 and 1995, the values for developing countries have decreased in the same period. For the coming three decades our results indicate a rapid increase in both the industrialized and developing countries. High values of ＞ 80% for fertilizer use efficiency may be related to surface N balance deficits, implying a depletion of soil N and loss of soil fertility. The projected intensification in most developing countries will cause a gradual shift from deficits to surpluses in the coming *** projected fast growth of crop and livestock production, and intensification and associated increase in fertilizer inputs will cause a major increase in the surface N balance surplus in the coming three decades. This implies increasing losses of N compounds to air (ammonia, nitrous oxide and nitric oxide), and groundwater and surface water (nitrate).

关键词：全球氮平衡土壤表面厩肥集约耕作

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Surface N balances and reactive N loss to the environment from global intensive agricultural production systems for the period 1970-2030

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Science China(Life Sciences) 2005年第Z2期48卷 767-779页

作者： A.F.Bouwman g.van drecht K.W.van der Hoek Netherlands Environmental Assessment Agency National Institute for Public Health and the Environment P.O.Box 13720 BA BilthovenThe Netherlands Laboratory for Environmental Monitoring National Institute for Public Health and the Environment P.O.Box 13720 BA BilthovenThe Netherlands

Data for the historical years 1970 and 1995 and the FAO-Agriculture Towards 2030 projection are used to calculate N inputs (N fertilizer, animal manure, biological N fixation and atmospheric deposition) and the N export from the field in harvested crops and grass and grass consumption by grazing animals. In most industrialized countries we see a gradual increase of the overall N recovery of the intensive agricultural production systems over the whole 1970-2030 period. In contrast, low N input systems in many developing countries sustained low crop yields for many years but at the cost of soil fertility by depleting soil nutrient pools. In most developing countries the N recovery will increase in the coming decades by increasing efficiencies of N use in both crop and livestock production systems. The surface balance surplus of N is lost from the agricultural system via different pathways, including NH3 volatilization, denitrification,N2O and NO emissions, and nitrate leaching from the root zone. global NH3-N emissions from fertilizer and animal manure application and stored manure increased from 18 to 34 ***-1 between 1970 and 1995, and will further increase to 44 ***-1 in 2030. Similar developments are seen for N2O-N (2.0 ***-1 in 1970, 2.7 ***-1 in 1995 and 3.5 ***-1 in 2030) and NO-N emissions (1.1 ***-1 in 1970, 1.5 Tg-yr-1 in 1995 and 2.0 ***-1 in 2030).

关键词： surface N balances reactive N loss global intensive agricultural system.

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