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Carbon mineralization in subtropical alluvial arable soils amended with sugarcane bagasse and rice husk biochars

查看全文 作　　者：Mohammad Arifur [1]RAHMAN;Mohammad Abdul [2,3,5]KADER;Mohammad [3]JAHIRUDDIN;Mohammad Rafiqul [3]ISLAM;Zakaria Mohammad [4]SOLAIMAN 高影响力作者 机构地区：[1]Regional Agricultural Research Station(RARS),Bangladesh Agricultural Research Institute(BARI),Jamalpur 2000(Bangladesh);[2]School of Agriculture,Geography,Environment,Ocean and Natural Sciences,University of South Pacific,Apia 1343(Samoa);[3]Department of Soil Science,Bangladesh Agricultural University(BAU),Mymensingh 2202(Bangladesh);[4]UWA School of Agriculture&Environment and the UWA Institute of Agriculture,Perth,WA 6009(Australia);[5]School of Veterinary and Life Science,Murdoch University,Murdoch,WA 6150(Australia)高影响力机构 出　　处：《Pedosphere》索引2022年第32卷第3期,共12页高影响力期刊 基　　金：the BARC(Bangladesh Agricultural Research Council)for awarding a postgraduate scholarship with research support to the first author through the NATP(National Agricultural Technology Program)Phase-ⅡProject。 摘　　要：Subtropical recent alluvial soils are low in organic carbon(C).Thus,increasing organic C is a major challenge to sustain soil fertility.Biochar amendment could be an option as biochar is a C-rich pyrolyzed material,which is slowly decomposed in soil.We investigated C mineralization(CO_(2)-C evolution)in two types of soils(recent and old alluvial soils)amended with two feedstocks(sugarcane bagasse and rice husk)(1%,weight/weight),as well as their biochars and aged biochars under a controlled environment(25±2℃)over 85 d.For the recent alluvial soil(charland soil),the highest absolute cumulative CO_(2)-C evolution was observed in the sugarcane bagasse treatment(1140 mg CO_(2)-C kg^(-1)soil)followed by the rice husk treatment(1090 mg CO_(2)-C kg^(-1)soil);the lowest amount(150 mg CO_(2)-C kg^(-1)soil)was observed in the aged rice husk biochar treatment.Similarly,for the old alluvial soil(farmland soil),the highest absolute cumulative CO_(2)-C evolution(1290 mg CO_(2)-C kg^(-1)soil)was observed in the sugarcane bagasse treatment and then in the rice husk treatment(1270 mg CO_(2)-C kg^(-1)soil);the lowest amount(200 mg CO_(2)-C kg^(-1)soil)was in the aged rice husk biochar treatment.Aged sugarcane bagasse and rice husk biochar treatments reduced absolute cumulative CO_(2)-C evolution by 10%and 36%,respectively,compared with unamended recent alluvial soil,and by 10%and 18%,respectively,compared with unamended old alluvial soil.Both absolute and normalized C mineralization were similar between the sugarcane bagasse and rice husk treatments,between the biochar treatments,and between the aged biochar treatments.In both soils,the feedstock treatments resulted in the highest cumulative CO_(2)-C evolution,followed by the biochar treatments and then the aged biochar treatments.The absolute and normalized CO_(2)-C evolution and the mineralization rate constant of the stable C pool(K_(s))were lower in the recent alluvial soil compared with those in the old alluvial soil.The biochars and aged biochars had a negative priming effect in both soils,but the effect was more prominent in the recent alluvial soil.These results would have good implications for improving organic matter content in organic C-poor alluvial soils. 关 键 词：aged biochar biochar amendment charland CO_(2)emission CO_(2)-C evolution recent alluvial soil soil organic carboon soil organic matter
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