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| Biogas Potential, Cropland Load and Total Amount Control of Animal Manure in China |
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| KeyWord:animal manure; biogas utilization potential; nitrogen and phosphorous cropland load; total amount control |
| Author Name | Affiliation | | ZHU Jian-chun | Research Center for Rural Society，Northwest A ＆ F University，Yangling 712100，China
College of Humanities，Northwest A ＆ F University，Yangling 712100，China | | ZHANG Zeng-qiang | College of Resources and Environment，Northwest A ＆ F University，Yangling 712100，China | | FAN Zhi-min | College of Humanities，Northwest A ＆ F University，Yangling 712100，China | | LI Rong-hua | Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture，Yangling 712100，China |
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| Abstract: |
| Aminal manure may contaminate the environment, but can still contribute to soil fertility and tilth and biogas production. This paper estimated discharge coefficient, N, P and COD loads, and biogas generation capacity of the manures from animal husbandry industry in China from 1978 to 2011, using the data collected from the Statistical Yearbook of China and China Animal Husbandry Yearbook. The results showed that the production amount of animal manure was mainly from cattle, pig, sheep and poultry breeding. The animal manure production and derived COD had increased by 1.35 and 0.91 times from 1978 to 2011 , reaching 2.545 billion tons and 0.233 billion tons in 2011, respectively. Biogas production in 2011 was 75.704 billion m3, amounting to 54 million tons of standard coal. The biogas generation in Henan, Sichuan, Hebei, Shandong and Inner Mongolia was much higher than that in other provinces. Amounts of nitrogen and phosphorous from animal manure were 14.20 million and 2.48 million tons in 2011, increasing by 1.39 and 1.66 times from 1978 to 2011 respectively. The number of animals from poultry breeding industry in most regions or provinces had surpassed 50% of the holding capacity of the environment. Areas with higher contamination risks from the release of nitrogen and phosphorous were mainly in economically developed coastal regions such as Shandong, Beijing, Hunan, Hubei, Guangdong, Guangxi, Liaoning, Tianjin, Hebei, Fujian, Henan and Hainan. The result suggests that the breeding of livestock and poultry in these areas should be controlled, but in other areas such as Inner Mongolia，Jiangxi, Sichuan, Shanxi, Tibet, Shaanxi, Qinghai, Ningxia, Gansu and Xinjiang，the breeding scale still has room to develop. This study provided valuable information for how to improve the resource utilization of livestock manures and reduce the agricultural non-point source pollution in China. |
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