Emission characteristic of greenhouse gases and ammonia from open lot of scale dairy farm in spring

LIU Yu1,2 LIU Jie3 WANG Chaoyuan1,2,4 SHI Zhengxiang1,2,4 LI Baoming1,2,4

(1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing, China 100083)
(2.Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs, Beijing, China 100083)
(3.Shandong Yantai Haiyang Zhaohushan Provincial Nature Reserve Management Office, Yantai, Shandong Province, China 265100)
(4.Beijing Engineering Research Center on Animal Healthy Environment, Beijing, China 100083)

【Abstract】Climate change is currently a global concern, which is mainly caused by excessive emission of greenhouse gases and ammonia (NH3) to the atmosphere, in particular the emission of CH4, N2O and CO2 from agricultural production process. The greenhouse gas produced from manure management in livestock and poultry production is an important source of greenhouse gas emission. Besides, the fermentation process of animal manure may generate large amount of NH3, which is considered as an important polluting gas to the environmental and ecological system. Among agricultural sector, dairy farm is a big source of greenhouse gas and NH3 emissions. In China, a barn with a fully open lot, where the cows are freely accessible, is a typical operation for cows. The manure on the surface of the open lots is typically removed from days to weeks depending the climate and management in the farms, while the remained manure, liquid penetration and the cows on the lot are important sources of contaminated gas emissions. However, there are few field studies on the emissions from the lot because of its open characterization, relative low gas concentration and the potential impact on the daily management of the farms. In this paper, an integrated horizontal flux method, based on the mass balance principle, was used to calculate the emission fluxes of CH4, N2O, CO2, and NH3 from a typical dairy open lot in Beijing in spring by continuous measurement of their concentrations with the purpose to provide fundamental information on the emissions. As the emission source, the open lot, which was 40 m in length by 27 m in width and kept with 52 milking cows, was divided into upwind and downwind boundaries according to the dominating wind directions. The emission rate was calculated based on the concentration differences of the target gases continuously measured from the upwind and downwind boundaries at three different heights of 1, 2 and 3 m by a photoacoustic field gas-analyzer (INNOVA 1412i) and self-developed multiplexer. The results showed the overall emission rates of CH4, N2O, CO2, and NH3 from the dairy open lot were 155.59, 3.60, 4 869.37, and 66.27 mg/(m2·h) during the field measurement, respectively. The emissions of all the gases reached their daily peaks after manure removal in late afternoon. The emissions of CH4, N2O, and CO2 (based on CO2 equivalents) of the open lot accounted for 42.79%, 9.37%, and 47.83% of the total greenhouse gas emissions, respectively and their proportions were related to the climate, manure management strategies of the lot, and feed in gradients as well. Additionally, the CH4, N2O, and NH3 emission rates were significantly and positively affected by ambient temperature (P < 0.05). The CH4, N2O and NH3 emission rates could also be enhanced by wind speed within some limits. When the surface wind speed was around 5.16 m/s, which was measured on the point 1 m above the ground, the emissions of the three gases significantly differed from those under 4.05 and 4.75 m/s (P < 0.05). While, when the wind speed was 18.85 m/s, the emission rates were decreased, which could be explained by the crust formed on the manure surface due to the drying process under much higher wind speed and its prevention on the emissions. Besides, the manure removal activity increased the emissions of gases, and the impacts of ambient temperature and wind speed on the gas emission may also be altered to some extent.

【Keywords】 greenhouse gases; ammonia; emission control; dairy open lot; integrated horizontal flux method;

【DOI】

【Funds】 National Natural Science Foundation of China (31472132, 31172244) National Cow Industry Technical System (CARS-36)

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This Article

ISSN:1002-6819

CN: 11-2047/S

Vol 34, No. 22, Pages 178-184

November 2018

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Article Outline

Abstract

  • 0 Introduction
  • 1 Material and method
  • 2 Results and analysis
  • 3 Conclusions
  • References