Response of soil CO2 and N2O emissions to Phyllostachys edulis expansion and its mechanism
In the context of global change,research on greenhouse gas emission and sink in forest soil,especially on the response of soil greenhouse gas emission in Phyllostachys edulis expansion forests,is increasing.This paper reviews the soil greenhouse gas response and mechanism in P.edulis expansion forest.P.edulis relies on its powerful bamboo whips to grow rapidly and continuously expand into the surrounding stands,completing its growth within a short time.Due to its unique reproductive mode and strong expansion ability,many adjacent native forests are invaded by P.edulis expansion to form mixed forests,which gradually evolve into pure P.edulis forests.The expansion of P.edulis has an increasing impact on the native ecosystem,changing the material cycling process of the ecosystem,leading to an imbalance in soil carbon and nitrogen input and transformation,and thus affecting greenhouse gas emissions.Nitrous oxide(N2O)and carbon dioxide(CO2)are two important greenhouse gases.Soil is an important carbon and nitrogen pool related to CO2 and N2O emissions.Soil physiochemical properties,litter decomposition and soil microbial community structure jointly determine soil greenhouse gas emissions.In recent years,the expansion area of P.edulis has been increasing,resulting in continuous changes in the soil environment in the expansion area,which has affected N2O and CO2 emissions to a certain extent.The results showed that after P.edulis expansion,soil pH increased,litter decomposition rate accelerated,and soil carbon and nitrogen increased.P.edulis expansion promoted soil CO2 emission,increased the abundance of soil arbuscular mycorrhizal fungi(AMF)in the expanded forest and affected nitrification and denitrification by regulating the abundance of N2O related functional genes such as amoA in ammonia-oxidizing archaea(AOA),nitrite reductase gene(nirK)and nitrous oxide reductase gene(nosZ),thereby further affecting soil N2O emissions.Future research should further explore its internal mechanism to provide theoretical support for the scientific management of P.edulis expansion forest and greenhouse gas emission reduction.[Ch,79 ref.]
万方数据
维普
