EFFECTS OF GARDEN WASTE ON EMISSION REDUCTION AND MICROBIAL COMMUNITY IN COASTAL SALINE SOIL
To explore the effects of garden waste compost on saline soil properties and carbon sequestration,field experiments were conducted using three treatments:garden waste compost(T1),a mixture of garden waste compost and bentonite(T2),and a non-amended control(CK).Changes in soil pH,EC,total porosity,saturated hydraulic conductivity,available nitrogen,phosphorus,and potassium,organic carbon storage(ΔSOC),microbial biomass carbon(MBC),and microbial community were analyzed.The results showed that composting garden waste can reduce carbon emissions by 53％compared to traditional incineration.Additionally,the application of garden waste compost can increase ΔSOC by 5 to 24 times.The soil bulk density and EC of T1 and T2 were significantly lower than CK,while the total porosity and saturated hydraulic conductivity were significantly higher than CK.T2 had the highest nutrient content,with soil organic matter and available nitrogen twice as high as those in the CK group.The mixed application of compost and bentonite significantly increased soil nutrient content,with an improvement effect significantly higher than that of other treatments.The application of garden waste compost can also change the microbial community structure.The main dominant bacteria included Proteobacteria,Actinomycetes,Bacteroidetes,Chloroflexi,Gemmatimonadetes,and Acidobacteria.Among the fungi,Ascomycota,Basidiomycota,Chytridiomycota,and Mortierella were dominant.Pearson correlation analysis also showed that Acidobacteria and Actinomycetes were significantly positively correlated with organic carbon,microbial biomass carbon,and soil nutrients,and significantly negatively correlated with soil salinity and bulk density.
garden wastesaline soilmicrobial community structurecarbon fixationemission reduction
NETL
NSTL
万方数据
