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全球氮素流通的现状、特点和趋势研究
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摘要
本文以全球化为背景,研究国家内部农产品氮(包括肥料氮)供需,国与国之间以农产品为载体的氮素贸易,以及氮素流通及输入输出过程中产生的环境效应。通过分析不同案例国采取的农产品安全保障策略,试图揭示全球化背景下农产品的供需规律,以及今后可能的发展方向。本文对研究粮食安全及宏观尺度养分管理具有重要的理论和现实意义。主要结论如下:
     1)从1961年到2009年,全球氮不能自给的国家和人口比例持续增加,分别从40%和20%增加到65%和50%左右,而出口者阵营并没有扩充,仍然维持在20%或低于20%的水平。全球氮肥产业布局逐渐发生变化,欧美等发达国家或者缩小氮肥产业规模,或者将氮肥工业向发展中国家转移,越来越多的发展中国家承担起了高污染高能耗的氮肥生产者的角色。全球农产品氮的供需因氮种类不同而不同,土地、能源、水资源对粮食安全的约束越来越强。从1961年到2009年,全球氮肥、植物性食品氮、饲料氮和水产品氮不能自给的国家和人口均在增加;资源约束小的动物性食品氮能够自给的国家和人口不断增加。全球化并没有解决粮食安全问题,却导致生产者价格和消费者价格差距不断拉大,二者都面临不稳定的压力。
     2)农产品贸易的全球化带动全球氮素流量和流向发生剧烈变化。从对矿产的进出口情况可以看到,2011年欧洲主销区的地位在逐渐削弱,亚洲和非洲的出口能力在逐渐增强,北美和南美为净进口区域,其对进口增量的贡献分别为39.5%和28.5%。2011年农产品氮贸易以亚洲和非洲进口为主,欧洲和北美为植物性食品氮和动物性食品氮的主要出口区域,南美为饲料氮的主要出口区域。目前的农业全球化是以矿产、土地等自然因素为推动力的,欧美在逐渐缩小资源消耗型的产业规模;亚非发展中及落后地区以矿产换食品,南美地区以土地换矿产和食品。未来全球农产品氮贸易以亚洲、南美和非洲地区承担主要角色。
     3)从环境角度来看,欧洲作为工业革命的发源地,以投入外源肥料和有机物质发展农业生产为主要特点,然而,随着时间的推移,过量投入逐渐超出环境承载范围,单位土地氮负载严重超标。20世纪末和21世纪初,欧美转变发展策略,在缩小资源消耗型产业规模的同时减少外源氮素投入,提高体系内氮素循环利用效率,单位土地氮负载在不断下降。然而,全球其他地区,由于经济发展及人口增长的压力,仍在走高投入低效率的发展道路,单位土地氮负载在不断升高,以亚洲地区较明显。按照氮肥用量计算,当前全球12个国家单位可耕地氮负载超过200公斤,而按照所有农产品氮(包括肥料氮)计算,全球33个国家单位耕地氮负载超过200公斤。当前仅美欧部分国家在改善,而包括日韩等在内的绝大多数国家仍在快速走向恶化。
     4)在不同的氮贸易策略下,完全依赖于进口食物的石油出口大国(中东)未来环境问题可能最大;小型岛屿发达经济体(日韩)未来环境压力和农业生产压力都较大;新兴人口大国(中印巴)高度追求自给,正在走向农业生产和环境污染的交义路口;欧美发达国家追求动物食品自给是环境压力较大的主要原因;非洲国家化肥投入极低,外部养分输入是其保持农业生产发展的关键。未来的农业全球化中,大部分国家只有将技术和环境纳入政策考虑范畴,像欧美国家一样,才可能实现全球公平和可持续发展。
In the context of globalization, this dissertation studied the self-sufficiency ratio of nitrogen contained in agricultural products (include nitrogen in fertilizer) in countries all over the world, nitrogen flow between countries accompanying world trade of agricultural products and the environmental effects generated in the process of nitrogen input and output, and that of nitrogen flow. We tried to uncover laws of demand and supply of agricultural products under globalization, and possible trends in the future by analyzing food security strategies adopted by typical countries. It is meaningful for studying food security and nutrient management in macroscale-no matter in theory or in practice-by taking this article as reference. The main conclusions of this article are as follow:
     1) From1961to2009, the proportion of countries and population that couldn't satisfy their demand for food was consistently increasing from the ratio of40%and20%to65%and50%respectively. At the same time, those were able to export hardly varied, they remained the ratio of around or below20%. The distribution of global N industry gradually changed. Developed countries like Europe and US either minimized its scale of N fertilizer industry, or moved fertilizer industry into developing countries. More and more developing countries undertook the role of fertilizer producer, which is high pollution and high energy-consuming activities. The global N supply of agricultural products relies on different N categories. Land, energy and water was strengthening their constraint over food security. From1961to2009, countries and population that couldn't satisfy their demand for fertilizer, vegetal-origin food and feed was increasing; Animal-origin food that less restrained by resource could satisfy more countries and population. Globalization didn't solve the problem of food security, but widening the difference between producer and consumer price instead, which rendered the two subjects facing the pressure of instability.
     2) The globalization of the trade of agricultural products gave rise to tremendous variation of the quantity and direction of nitrogen flow in global scale. When analyzing the import and export situation of mineral products, we could find that European countries were cutting down their capacity in exporting nitrogen fertilizer in2011, while countries in Asia and Africa were increasing this capacity. North and South America was net import areas for nitogen fertilizer, and their contribution to the increment of nitrogen fertilizer import was39.5%and28.5, respectively. In2011, Asia and Africa were the major areas importing nitrogen contained in all agricultural products; Europe and North America were major exporting areas of vegetal-N and animal-N, while South America was main exporting area of feed-N. Natural element, such as mineral products and land, was driver of the globalization of agriculture at present. Europe and America was contracting the scale of resource-consuming industry; while developing and underdeveloped countries in Asia and Africa was exchanging mineral products for food, and South America was exchanging land for mineral products and food. Asia, South America and Africa will take leading roles in the trade of nitrogen contained in agricultural products in the future.
     3) From the perspective of environment, Europe-birthplace of industrial revolution-characterized by inputing exogenous fertilizer and organic matters to develop its agricultural production. However, as time goes by, the overuse of the exogenous matters gradually exceeded the spectrum that the environment could bear, and the total nitrogen load per ha arable land was out of limits seriously. In the late20th century and early21st century, Europe and American transformed their developing strategy. They contracted the scale of resource-consuming industry, reduced the input of exogenous matter at the same time, and enhanced nitogen use efficiency and recycling within the agricultural system. All this resulted in the decrease of nitrogen load per ha arable land. However, the rest of the world, owing to the pressure of economic development and the constently increasing population for food, still took the way of high input and low efficiency, and the nitrogen load per ha arable land was constantly increasing, and Asia was the typical region of this pattern. In2009,12countries in the world fertilizer N load per ha arable land exceeded200kgN/ha,33countries exceeded the same value when evaluated by total N load. It was only part of countries in Europe and countries that improved their nitrogen input at present, countries including Japan and Republic of Korea still went worse rapidly.
     4) Under different N trade strategy, oil exporting countries like the Middle East, they totally depend on food import, and might face the most serious environmental problem in the future. Advanced economies in small islands like Japan and Republic of Korea, they might have great pressure in both agricultural production and environment. Emerging populous countries like China, India and Brazil, they highly pursuit self-sufficiency of agricultural products, and they were moving toward the crossroad of agricultural production and environmental pollution. Countries like Europe and America, satisfying the increasing demand for animal-origin food was the main reason of great environmental pressure. Fertilizer input in African countries was relatively low, exogenous nutrient input was key issue to keep the development of their food production. In the future agricultural globalization, only by including technology and environment into policy consideration for most of the countries-like Europe and America-could they realize justice and sustainable development.
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