Influence of increasing temperature and nitrogen input on greenhouse gas emissions from a desert steppe soil in Inner Mongolia(Soil biology)

概要

論文の詳細を見る
We investigated the effect of increasing soil temperature and nitrogen on greenhouse gas (GHG) emissions [carbon dioxide (CO_2), methane (CH_4) and nitrous oxide (N_2O)] from a desert steppe soil in Inner Mongolia, China. Two temperature levels (heating versus no heating) and two nitrogen (N) fertilizer application levels (0 and 100kg N ha^<-1>year^<-1>) were examined in a complete randomized design with six replications. The GHG surface fluxes and their concentrations in soil (0 to 50cm) were collected bi-weekly from June 2006 to November 2007. Carbon dioxide and N_2O emissions were not affected by heating or N treatment, but compared with other seasons, CO_2 was higher in summer [average of 29.6 versus 8.6mg carbon (C) m^<-2>h^<-1> over all other seasons] and N_2O was lower in winter (average of 2.6 versus 4.0mg Nm^<-2>h^<-1> over all other seasons). Desert steppe soil is a CH_4 sink with the highest rate of consumption occurring in summer. Heating decreased CH_4 consumption only in the summer. Increasing surface soil temperature by 1.3℃ or applying 100kg ha<-1>year^<-1> N fertilizer had no effect on the overall GHG emissions. Seasonal variability in GHG emission reflected changes in temperature and soil moisture content. At an average CH_4 consumption rate of 31.65μg Cm^<-2>h^<-1>, the 30.73 million ha of desert steppe soil in Inner Mongolia can consume (sequestrate) about 85×10^6kg CH_4-C, an offset equivalent to 711×10^6kg CO_2-C emissions annually. Thus, desert steppe soil should be considered an important CH_4 sink and its potential in reducing GHG emission and mitigating climate change warrants further investigation.
一般社団法人日本土壌肥料学会の論文

Influence of increasing temperature and nitrogen input on greenhouse gas emissions from a desert steppe soil in Inner Mongolia(Soil biology)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク