Effects of compound management patterns in poplar plantations on the emissions of N2O and CO2 from the soil
To evaluate the effects of different compound management patterns on soil greenhouse gas emissions in poplar plantations,a field experiment was performed at the"Nanlin-895 Poplar"(Populus×euramericana'Nanlin-895')plantations of 11-year old.Three compound management patterns were conducted in this experiment as follows:pure poplar plantation(P),planting Ophiopogon japonicas under the plantation(L),raising chicken under the plantation(C).The characteristics of soil N2O and CO2 emission fluxes were monthly measured by static chamber technique,while the soil temperature and moisture were measured synchronously to analyze the impacts of compound management patterns on N2O and CO2 emissions and crop yield,as well as the relationships between the related impact factors.The results indicated that there were significant differences in soil temperature and moisture among the different management patterns,while the significant differences in the monthly emission rates and annual cumulative emissions of soil N2O and CO2 were also detected among different management patterns.The annual cumulative emission of soil N2O was the highest in the pattern of planting O.japonicus under poplar plantation,reaching 233.47 mg·m-2·a-1,whereas the annual cumulative emission of soil CO2 was the greatest in the pattern of raising chicken under poplar plantation,up to 2328.87 g·m-2·a-1.In general,the annual cumulative emission of soil greenhouse gases(N2O and CO2)in the different compound management patterns was as follows:raising chicken under the plantation>planting O.japonicas under the plantation>pure poplar plantation.Soil temperature and moisture had significant effects on soil CO2 and N2O emission rates,and there was a significant linear correlation between soil CO2 emission rate and soil temperature,while a parabolic relationship between soil CO2 emission rate and soil moisture.However,the relationships of N2O emission rate to soil temperature and moisture could be described by parabola.As mentioned above,different compound management patterns in poplar plantations modified the soil temperature and moisture,and then significantly affected the greenhouse gas emissions from the soils.Based on the results,the annual cumulative emissions of soil greenhouse gases in two agroforestry compound management patterns(planting O.japonicas in the plantation and raising chicken under the plantation)were higher than those in the pure plantation,indicating that poplar agroforestry patterns would increase the soil greenhouse gas emissions.
poplar plantationclimate changestatic chamber techniqueagroforestrygreenhouse gas
国家科技期刊平台
NSTL
万方数据
