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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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Organic farming can enhance agriculture carbon sinking  

2015-05-04 22:52:09|  分类: 环保呐喊 |  标签: |举报 |字号 订阅

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PUBLIC RELEASE: 29-APR-2015Organic farming can reverse the agriculture ecosystem from a carbon source to a carbon sink


SCIENCE CHINA PRESS

HTTP://WWW.EUREKALERT.ORG/PUB_RELEASES/2015-04/SCP-OFC042915.PHP

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IMAGE: THIS IMAGE SHOWS PROCESSES OF GREENHOUSE GASES EMISSION AND SEQUESTRATION IN THE STUDIED AGRO-ECOSYSTEM. view more 

CREDIT: ?SCIENCE CHINA PRESS

Approximately 35% of global greenhouse gases (GHGs) come from agriculture. Some argues that human can reverse global worming by sequestering several hundred billion tons of excess CO2 through regenerative, organic farming, ranching and land use. Increasing the soil's organic content will not only fix carbon and reduce emissions, it will also improve the soil's ability to retain water and nutrients and resist pests and droughts.

To mitigate GHG 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. Recent research showed that replacing chemical fertilizer with organic manure significantly decreased the emission of GHGs. Organic farming can reverse the agriculture ecosystem from a carbon source to a carbon sink.

To explore the potential of farmlands acting as a carbon sink without yield losses, Jiang Gaoming, a professor at the Chinese Academy of Sciences' Institute of Botany, conducted an experiment on a temperate eco-farm in eastern rural China. Crop residues were applied to cattle feed and the composted cattle manure was returned to cropland with a winter wheat and maize rotation. Crop yield and greenhouse gas (GHG) emissions were carefully calculated according to the Intergovernmental Panel on Climate Change (IPCC) Guidelines for National Greenhouse Gas Inventories 2006.

This study showed that replacing chemical fertilizer with organic manure significantly decreased the emission of GHGs. Yields of wheat and corn also increased as the soil fertility was improved by the application of cattle manure. Totally replacing chemical fertilizer with organic manure decreased GHG emissions, which reversed the agriculture ecosystem from a carbon source (+ 2.7 t CO2-eq. hm-2 yr-1) to a carbon sink (- 8.8 t CO2-eq. hm-2 yr-1).

Making full use of crop residues as forage for cattle, collecting and composting cattle manure, and replacing part of the chemical fertilizer input with organic manure have been successfully shown to be ideal choices to reduce energy waste and cut GHG emissions without crop yield losses. A combination of organic manure and chemical fertilizer demonstrated the best result in improving soil quality and crop yields, while decreasing GHG emissions. Solely utilizing chemical fertilizer on the farmland not only led to increased GHG emissions, but also deteriorated the quality of the soil.


###

This research was jointly funded by the Key Strategic Project of the Chinese Academy of Sciences (KSZD-EW-Z-012-2) and the National Science and Technology Support Program, China (No.2012BAD14B00).

See the article:

Haitao Liu, J.L., Xiao Li, Yanhai Zheng, Sufei Feng, Gaoming Jiang. 2015. Mitigating greenhouse gas emissions through replacement of chemical fertilizer with organic manure in a temperate farmland. Science Bulletin, 60(6), 598-606.

Science China Press

http://www.scichina.com/


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本文引用地址:http://blog.sciencenet.cn/blog-475-886355.html  此文来自科学网蒋高明博客,转载请注明出处。
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