Effects of Harvesting Residue Management on Soil Greenhouse Gas Fluxes in Young Cunninghamia Lanceolata Plantation
Forest is an important source or sink of CO2,CH4,and N2O.Forest management practices can directly or indirectly affect soil greenhouse gas(GHG)fluxes.Previous studies have mainly focused on the effects of fire management on forest soil CO2 emissions,but few studies have assessed the effects of different forest management practices on the warming potential of the three greenhouse gases.In order to study the effects of different harvest residue management on soil greenhouse gases fluxes,a young Cunninghamia lanceolata plantation in the Sanming Nature Reserve in Fujian Province was used as the study object.Soil GHG fluxes were measured by static chamber gas-chromatograph un-der three harvest residue treatments:retention(CT),burning(RB),and removal(R)from July 2018 to July 2019.The results showed that,1)the cumulative emission fluxes of soil CO2 and N2O were significantly higher in the CT treatment than in the R and RB treatments,while the cumulative uptake fluxes of soil CH4 were significantly lower in the CT treatment than in the R and RB treatments.The differences in fluxes of the three greenhouse gases were not significant between the R and RB treat-ments.2)There is no significant difference in soil temperature and volumetric water content among dif-ferent treatments.However,the application of different harvest residue treatments altered the correlation between soil GHGs,soil temperature,and soil volumetric water content.3)The redundancy analysis showed that the most highly interpreted indicator of soil GHGs was soil microbial biomass car-bon.This indicator demonstrated a positive correlation with soil CO2 and N2O,while conversely,a negatively correlated with soil CH4.In summary,the removal and burning of harvest residues reduces soil microbial biomass,and thus,reduces soil GHG fluxes.
greenhouse gas fluxesharvest residueCunninghamia lanceolata plantation
NETL
NSTL
万方数据
