摘要
为了探讨发酵园林废弃物对盐渍土性质的影响及其固碳减排效应,利用大田试验,设置发酵园林废弃物施用(T1)、混施膨润土(T2)与对照(CK)3组处理。通过土壤pH、EC、总孔隙度、饱和导水率、速效氮磷钾、有机碳储量变化(ΔSOC)、微生物量碳(MBC)、细菌与真菌群落结构揭示其变化规律。结果表明:园林废弃物堆肥相比于传统焚烧处理可减少53%碳排放,发酵园林废弃物的施用可使ΔSOC增加5~24倍。T1、T2组处理的土壤容重与EC显著低于CK组,总孔隙度和饱和导水率显著高于CK组。T2的养分含量最高,土壤有机质和速效氮的含量均为CK组的2倍,堆肥与膨润土混施可显著提高土壤养分含量,改良效果显著高于其他处理。发酵园林废弃物的施用还可以改变微生物群落结构,变形菌门、放线菌门、拟杆菌门、绿弯菌门、芽单孢菌门和酸杆菌门为主要的优势菌。真菌中子囊菌门、担子菌门、壶菌门、被孢霉门为主要的优势菌。Pearson相关分析也表明:酸杆菌门和放线菌门与有机碳储量、微生物量碳、土壤养分等呈显著正相关,与土壤盐分、容重呈显著负相关。
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 increaseΔSOC 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 Acidobacteriaand Actinomycetes were significantly positively correlated with organic carbon, microbial biomass carbon, and soil nutrients,and significantly negatively correlated with soil salinity and bulk density.
作者
李婧男
汪群慧
梁宝瑞
王万清
刘俊杰
LI Jingnan;WANG Qunhui;LIANG Baorui;WANG Wanqing;LIU Junjie(Department of Environmental Engineering,Tianjin College,University of Science and Technology Beijing,Tianjin 301830,China;College of Energy and EnvironmentalEngineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《环境工程》
CAS
CSCD
2024年第1期95-101,共7页
Environmental Engineering
基金
天津市教委科研计划项目“改性园林废弃物PFRs形成机制及其土壤固碳修复关键技术研究”(2022KJ030)。
关键词
园林废弃物
盐渍土
微生物群落结构
固碳
减排
garden waste
saline soil
microbial community structure
carbon fixation
emission reduction
