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Reaching on Environmental Carrying Capacity of Livestock and Poultry Based on Nitrogen Balance in Beijing

Author: ShengQiaoLing
Tutor: XuGang；WangAiLing
School: Southwestern University
Course: Physical Geography
Keywords: Carrying capacity Nitrogen balance Standard livestock Beijing
CLC: X712
Type: Master's thesis
Year: 2010
Downloads: 212
Quote: 1
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Abstract

Livestock and poultry environmental problem is a common problem facing developed and developing countries, livestock manure processing is a worldwide problem in China and also to go to one of the important issues facing low-carbon agriculture roads. Feed consumption for livestock and poultry industry needs to have a certain scale farming production out to protect livestock pollution emissions need to have a certain scale of farming to consumer satisfaction. Regional farming and breeding industry does not match one of the main pollution caused by livestock farming. Environment bearing capacity in the area of ??land, population, ecology, water resources and tourism resources at home and abroad and in-depth, and the relative lack of environmental carrying capacity study of the livestock and poultry industry. Beijing to build a livable city, the livestock and poultry industry has not only completely withdraw from main 城八区, but light, animal husbandry, the abandoned animal husbandry, and even banned the voices of the capital of the livestock and poultry industry have occurred. Sustainable and balanced development from the perspective of the recycling economy and environmental carrying capacity, Beijing only retain a certain scale animal husbandry, and more conducive to the improvement of the environment and agriculture. 13 districts and counties of Beijing suburbs, every district agricultural land as a large \Suppose farmland farming without purchased fertilizer, manure entire field. Agricultural planting and breeding between the nitrogen balance method to calculate the size of the suburbs of Beijing environmental carrying capacity of livestock and poultry in 13 districts and counties, and divided on the basis of the warning level of the environmental carrying capacity of livestock and poultry in cropping systems the premise of change can visually judge the scale of livestock and poultry is reasonable or not, and to provide scientific basis for the development of the reasonable scale livestock and poultry and related adjustments countermeasures of Beijing. Overall, this study achieved the following results: 1, on the basis of previous studies, and improve the livestock and the concept of environmental carrying capacity and standard livestock, raised the standard method of the calculation of the livestock. Through the countryside research, measured, and expert advice quantitatively calculate the conversion coefficient of the standard livestock based on livestock Day feces nitrogen displacement. The results: a standard cow = 23.11 standards pig = 2.65 standard sheep = 497.59 standard chicken = 226.01 standard duck. 3, the use of nitrogen balance method by quantitative calculation for various districts and counties in Beijing suburbs crops under existing cropping systems need the total amount of nitrogen and soil nitrogen in animal manure crops required for nitrogen, then calculate the Beijing environmental carrying capacity of rural counties of livestock and poultry. The study identifies the early warning of environmental carrying capacity of livestock and poultry, and the division of the warning level. Livestock environmental carrying capacity of the various districts and counties of Beijing suburbs Status and warning level analysis shows that in general, the entire livestock and poultry in Beijing already overloaded, overloading a lesser extent, individual counties breeding overloading uneven distribution. The Tongzhou District Daxing District, farming and aquaculture approximate matching counties, other counties there are varying degrees of planting and breeding industry disjointed, Mentougou, Shunyi District, Fangshan, Changping District and Miyun County livestock the poultry farming scale should step up efforts; Pinggu, Huairou District and Yanqing County, the scale of farming should be appropriately increased; Chaoyang District, Fengtai District, Haidian District, away from the city, farming retention and appropriate to increase the number of larger area the scale of livestock and poultry. Various districts and counties in the suburbs of Beijing the livestock environmental carrying capacity within the development of animal husbandry, livestock dung reasonable collection and treatment, will not damage the ecological environment, but will promote the virtuous circle of the breeding industry, but also conducive to the improvement of the ecological environment of farmland, increase agricultural Beijing ecological functions. Thus changing the capital of existing breeding = pollution \

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