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中国科学院植物研究所研究员,从事植物生态学研究

 
 
 

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联合国教科文组织人与生物圈中国国家委员会副秘书长、中国科学院植物研究所首席研究员、博士生导师、山东省人民政府泰山学者、中国科学院研究生院教授、联合国教科文组织人与生物圈计划城市组委员、中国生态学会副秘书长、中国生物多样性保护基金会副秘书长、中国环境文化促进会理事、中国植物学会植物生态学专业委员会委员、北京植物学会常务理事、青年工作委员会主任、中国生态系统研究网络生物分中心学术委员、中国科学院植物研究所学位委员会委员、

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Climatewire reports our findings in organic farming study  

2015-06-01 08:37:46|  分类: 环保呐喊 |  标签: |举报 |字号 订阅

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This ClimateWire story was sent to you by:cliu.info@gmail.com

Personal message: Dear Prof. Jiang -- Thanks again for your kind support. Please see the organic farming story below. Looking forward to learn your new studies on climate change issue in the future. All the best, Coco
ClimateWire
AN E&E PUBLISHING SERVICE
AGRICULTURE:
Organic farming will help China cut emissions without compromising crop production -- study
Coco Liu, E&E Asia correspondent
Published: Monday, May 11, 2015

HONG KONG -- Agriculture is known as a major contributor to greenhouse gas emissions, but a new study finds that organic farming can reverse the agriculture ecosystem from a carbon source to a carbon sink.

In a paper published in Science Bulletin, a group of scientists estimated that more than 1 billion tons of excess carbon dioxide can be stored in China's farmlands annually through regenerative organic farming, ranching and land use. Meanwhile, crop yields can also increase as the soil fertility is improved by the use of organic manure.

"To mitigate greenhouse gas emissions and retain soil fertility, organic agriculture might be a wise choice for decreasing the intensive use of synthetic fertilizers, protecting environments, and further improving crop yields," the scientists said.

They demonstrated how to do so by integrating organic farming with cattle breeding in a rural area of eastern China's Shandong province. The majority of nutrient inputs in farmlands there traditionally came from chemical fertilizer. During the experimental run, the scientists fed cattle with crop residues, collected and composted cattle manure, and used it to replace chemical fertilizer for crop production.

The study's finding shows that although cattle breeding causes higher emissions of methane and other type of greenhouse gases, the new practice still sequesters more carbon, thanks to crop residue recycling and chemical reduction.

Putting that into numbers, the study notes, farmlands using cattle manure absorb greenhouse gas emissions equivalent to 8.8 tons of carbon dioxide per hectare every year. By contrast, the farmland using chemical fertilizer releases greenhouse gas emissions equivalent to 2.7 tons of carbon dioxide.

Besides that, turning crop residues into animal feed helps make full use of agricultural waste. According to the scientists' estimation, China produces about 630 million tons of crop residues annually, with more than two-thirds of them being abandoned or burned -- causing air pollution and driving up greenhouse gas emissions.

World's biggest agricultural emitter has options

Unlike ranchers in Brazil who have cleared forests to build facilities for cattle, most farmers in eastern China enclose part of their existing agricultural land as cattle pasture. As a result, emissions from land-use change are barely a concern there.

A 2011 report from the Food and Agriculture Organization of the United Nations says that agriculture causes about one-third of global greenhouse gas emissions when direct energy use; emissions from livestock; the production of fertilizers, pesticides, machinery and equipment; as well as soil degradation and land-use change for feed production are taken into account. An analysis by the Washington, D.C.-based think tank World Resources Institute shows that in 2011, China generated more agriculture-related emissions than any other nation.

Jiang Gaoming, one of the study's authors and a professor at the Chinese Academy of Sciences' Institute of Botany, said that using organic manure can significantly reduce greenhouse gas emissions from crop production. If the country completely replaces chemical fertilizer with organic manure, "the [mitigation] potential should be 1.38 billion tons of carbon dioxide for the whole China's farmland per year," Jiang said.

However, there are barriers to making such a switch. For one, according to Jiang, farms in China are reluctant to use organic fertilizer as this requires more labor, and labor costs have increased greatly in recent years. In addition, the country may not be able to find enough organic fertilizer to use if all the farmlands are replaced with organic fertilizer, Jiang said.

Jiang and his team suggested that the Chinese government could encourage farmers to use half the amount of chemical fertilizer while the rest is replaced with organic ones. "A combination of organic manure and chemical fertilizer demonstrated the best result in improving soil quality and crop yields, while decreasing greenhouse gas emissions," the scientists said.

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ABOUT CLIMATEWIRE – THE POLITICS AND BUSINESS OF CLIMATE CHANGE
ClimateWire is written and produced by the staff of E&E Publishing, LLC. It is designed to provide comprehensive, daily coverage of all aspects of climate change issues. From international agreements on carbon emissions to alternative energy technologies to state and federal GHG programs, ClimateWire plugs readers into the information they need to stay abreast of this sprawling, complex issue.




本文引用地址:http://blog.sciencenet.cn/blog-475-889526.html  此文来自科学网蒋高明博客,转载请注明出处。 
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