|
| Temporal and spatial distribution of air pollutants emitted from field burning of straw crops in Southern China during 2005-2014 |
| Received:August 14, 2017 Revised:September 27, 2017 |
| View Full Text View/Add Comment Download reader |
| KeyWord:indoor simulation experiments;emission factors;air pollutants;emission inventory;temporal and spatial variation |
| Author Name | Affiliation | E-mail | | YANG Xia-jie | College of Forest, Fujian Agriculture and Forest University, Fuzhou 350002, China
Collaborative Innovation Center of Soil and Water Conservation in Red Soil Region of the Cross-Strait, Fuzhou 350002, China | | | MA Yuan-fan | College of Forest, Fujian Agriculture and Forest University, Fuzhou 350002, China
Collaborative Innovation Center of Soil and Water Conservation in Red Soil Region of the Cross-Strait, Fuzhou 350002, China | | | JU Yuan-hua | College of Forest, Fujian Agriculture and Forest University, Fuzhou 350002, China
Collaborative Innovation Center of Soil and Water Conservation in Red Soil Region of the Cross-Strait, Fuzhou 350002, China | | | CAI Qi-jun | College of Forest, Fujian Agriculture and Forest University, Fuzhou 350002, China
Collaborative Innovation Center of Soil and Water Conservation in Red Soil Region of the Cross-Strait, Fuzhou 350002, China | | | GUO Fu-tao | College of Forest, Fujian Agriculture and Forest University, Fuzhou 350002, China
Collaborative Innovation Center of Soil and Water Conservation in Red Soil Region of the Cross-Strait, Fuzhou 350002, China | guofutao@126.com |
|
| Hits: 2843 |
| Download times: 3754 |
| Abstract: |
| The objective of the present study was to estimate the emission of air pollutants from straw crop burning in four main crop production provinces of Southern China. Crop straw yield and amount of field combustion during 2005-2014 were calculated based on the statistical yearbook data. Indoor simulation experiments were also conducted to measure emission factors for CO, CO2, NOx, CxHy, and PM2.5 in rice, wheat, beans, rape, maize, cotton, and peanut straw. The straw crop yield in Southern China ranged from 59.361 Mt to 185.890 Mt during the study period; the lowest being in Fujian Province and the highest being in Yunnan Province. The total amount of field combustion ranged from 13.629 Mt(in Fujian Province) to 41.902 Mt(in Guangdong Province). The average emission factors for CO, CO2, NOx, CxHy, and PM2.5 from combustion of straw crops were 165.32, 1 231.76, 1.94, 38.47 g·kg-1, and 7.54 g·kg-1, respectively. Emissions of CO, CO2, NOx, CxHy, and PM2.5 from simulated burning experiments were 18 926.32, 149 866.73, 153.13, 6 467.09 kt, and 870.33 kt, respectively. Rice was the main source of air pollutants throughout the study areas, accounting for 61.16% to 84.83% of all types of pollutants. The temporal distribution of pollutants varied in each province, with emissions of pollutants having a decreasing trend in Fujian and an increasing trend in Guangdong, Guangxi, and Yunnan. The spatial pattern of pollution emissions was explicit, with a high area of air pollutant emission per unit grid in Guangdong, central Guangxi, and Eastern Yunnan, while it was relatively low and dispersed in Fujian Province. It can be concluded that burning crop residue contributes to environmental pollution in the study areas; thus, efforts should be made to develop alternative crop residue management techniques. |
|
|
|
