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reduced tillage with residue retention improves soil labile carbon pools and carbon lability and management indices in a seven-year trial with wheat-mung bean-rice rotation

引用

Pedosphere 2022年第6期32卷 916-927页

作者： rafeza begum.m.ham.ad m.r.jahangir mohammad JAHIrUDDIN mohammad rafiqul ISLAm Shaikh m.BOKHTIAr Khandakar r.ISLAm Department of Soil Science Bangladesh Agricultural UniversityMymensingh 2202(Bangladesh) Soil resource Development Institute Dhaka 1215(Bangladesh) South Asian Association for regional Cooperation(SAArC)Agriculture Center Dhaka 1215(Bangladesh) The Ohio State University Columbus OH 43235(USA)

Soil total organic carbon(TOC)is a composite indicator of soil quality with implications for crop production and the regulation of soil ecosystem *** reports on the dynamics of TOC as a consequence of soil management practices in subtropical climatic conditions,where microbial carbon(C)loss is high,are very *** objective of our study was to evaluate the impact of seven years of continuous tillage and residue management on soil TOC dynamics(quantitative and qualitative)with respect to lability and stratification under an annual wheat-mung bean-rice cropping *** soil samples were collected at 0-15 and 15-30 cm depths from a three-replicate split-plot experiment with tillage treatment as the main plots and crop residue levels as the *** tillage treatments included conventional tillage(CT)and strip tillage(ST).residue levels were high residue level(Hr),30%of the plant height,and low residue level(Lr),15%.In addition to TOC,soil samples were analyzed for particulate organic C(POC),permanganate oxidizable C(POXC),basal respiration(Br),specific maintenance respiration rate(qCO_(2)),microbial biomass C(mBC),potentially mineralizable C(PmC),and TOC lability and management *** ST treatment significantly increased the TOC and labile C pools at both depths compared with the CT treatment,with the effect being more pronounced in the surface *** Hr treatment increased TOC and labile C pools compared with the Lr *** ST+Hr treatment showed significant increases in mBC,metabolic quotient(qr),C pool index(CPI),C lability index(CL_(I)),and C management index(CmI),indicating improved and efficient soil biological activities in such systems compared with the CT ***,the stratification values,a measure of soil quality improvement,for POC and mBC were>2,indicating improved soil quality in the ST+Hr treatment compared with the CT *** ST+Hr treatment not only significantly increased the contents o

关键词： basal respiration carbon management index carbon stratification particulate organic carbon permanganate oxidizable carbon total organic carbon

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