Periodic Measurements of CO2 Emission Dynamics from Wheat Straw and It’s Biochar Added to Soil

Sindh University Research Journal Pub Date : 2017-12-19 DOI:10.26692/SURJ/2017.12.60

S. Abro, M. A. Gadehi, M. H. Odhano, M. W. Kalro, S. Mallah, G. S. Unar, A. A. Abro, S. Memon

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Abstract

To investigate the effects of direct incorporation of wheat straw (WS) and its biochar (WB) into loess soil a short-term laboratory incubation experiment was conducted. The purpose was to observe the comparative effects of (WS) and (WB) on carbon mineralization, CO2 emission trends, cumulative production and Carbon C sequestration (Cseq). The (WS) and (WB) were applied four rates each at (0, 5, 10, 15 g/kg soil). The results revealed that wheat straw significantly increased CO2 emission rates and cumulative contrary to that biochar produced from the wheat straw decreased CO2 emissions. Moreover, only 1.3% of added Biochar C was respired where as 36% of added wheat straw C was decomposed. Wheat straw had high amount of labile C that enhanced greenhouse gas (GHG-C) and decreased Cseq. In contrast, (WB) had recalcitrant C that is why decreased (GHG-C) and increased Cseq. Therefore, it can be concluded that (WB) was very stable C source and could be better strategy to mitigate GHG-C emissions and sequester C in soils for long-term sustainability

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小麦秸秆及其生物炭对土壤CO2排放动态的周期性测量

为研究小麦秸秆(WS)及其生物炭(WB)直接掺入黄土土壤的效果，进行了短期室内培养试验。目的是观察(WS)和(WB)对碳矿化、CO2排放趋势、累积产量和碳C固存(Cseq)的比较影响。(WS)和(WB)分别在(0、5、10、15 g/kg土壤)4种浓度下施用。结果表明，小麦秸秆显著增加了CO2排放速率和累积量，而小麦秸秆生产的生物炭则显著降低了CO2排放。此外，添加的生物炭C只有1.3%被呼吸，而添加的麦秸C有36%被分解。麦秸中挥发性碳含量高，增加了温室气体(GHG-C)，降低了Cseq。相反，(WB)具有顽固性C，这就是为什么(GHG-C)减少和Cseq增加的原因。因此，(WB)是一个非常稳定的碳源，可以作为减少温室气体-C排放和长期可持续性固碳的较好策略

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Sindh University Research Journal

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