Study on N2O and CH4 Emission from Stems and Leaves of Crops
Taking the main crops in Northeast China,including soybeans,corn and sorghum as the research objects,the N2O and CH4 emis-sions from the stems and leaves of soybean,maize and sorghum were investigated simultaneously for the first time.The results showed that all the stems of three plants could emit N2O.Among them,the maize stems showed high N2O emission,with concentration of 13.587 μL/L.The N2O emission from the leaves of the three plant species was lower,but the N2O emission from soybean leaves peaked at 42 h,reaching 33.913μL/L.The CH4 emissions from the stems of three plants showed absorption after initial emissions,with CH4 concentrations of 2.113,2.341 and 2.355μL/L for corn,soybean and sorghum at 3 hours,respectively;the CH4 emissions from plant leaves were not obvious,and showed a fluctuating law.From the perspective of N2O and CH4 emission fluxes,soybean leaves had the highest N2O flux,reaching 210.970 ng/(g·h);the CH4 flux of corn leaves was 0.148 ng/(g·h),while other stems and leaves absorbed CH4.The research results not only provide experimental basis for the universality of plant leaves emitting both N2O and CH4,but also identify a new emission site for N2O and CH4 in plants-the stem.
万方数据
