首页 | 本学科首页   官方微博 | 高级检索  
   检索      


The influence of plants on atmospheric methane in an agriculture-dominated landscape
Authors:Xin Zhang  Xuhui Lee  Timothy J Griffis  John M Baker  Matt D Erickson  Ning Hu  Wei Xiao
Institution:1. School of Forestry and Environmental Studies, Yale University, New Haven, CT, USA
2. Department of Soil, Water, and Climate, University of Minnesota, St Paul, MN, USA
3. Agricultural Research Service, USDA, St Paul, MN, USA
4. Yale-NUIST Center on Atmospheric Environment, College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
Abstract:The primary objective of this study was to clarify the influence of crop plants on atmospheric methane (CH4) in an agriculture-dominated landscape in the Upper Midwest of the United States. Measurements were carried out at two contrasting scales. At the plant scale, CH4 fluxes from soybean and corn plants were measured with a laser-based plant chamber system. At the landscape scale, the land surface flux was estimated with a modified Bowen ratio technique using measurements made on a tall tower. The chamber data revealed a diurnal pattern for the plant CH4 flux: it was positive (an emission rate of 0.4?±?0.1 nmol m?2 s?1, average of soybean and corn, in reference to the unit ground area) during the day, and negative (an uptake rate of ?0.8?±?0.8 nmol m?2 s?1) during the night. At the landscape scale, the flux was estimated to be 14.8 nmol m?2 s?1 at night and highly uncertain during the day, but the available references and the flux estimates from the equilibrium methods suggested that the CH4 flux during the entire observation period was similar to the estimated nighttime flux. Thus, soybean and corn plants have a negligible role in the landscape-scale CH4 budget.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号