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¡¾Abstract¡¿ Global climate change has attracted worldwide attention. Human activities, industrial emissions and the use of fossil fuels lead to the increase of carbon dioxide emissions and the global greenhouse effects have been added. The ecological system of agriculture has played an important role in global greenhouse gas circulation. Agriculture is not only carbon cool but also carbon source. On the one hand crops may fix carbon, on the other hand soil respiration, the use of chemical fertilizers, raisi... [url=]¸ü¶à[/url][url=]»¹Ô[/url]
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