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標題

Interactions between aged biochar, fresh low molecular weight carbon and soil organic carbon after 3.5 years soil-biochar incubations

作者

Xinyu Jianga, Xiangping Tanb, Jiong Chenga, Michelle L. Haddixc, M. Francesca Cotrufoc

名稱(期刊/節目)

Geoderma

期刊期數/節目集數

Volume 333 Pages 99-107

出版單位

ELSEVIER

出版年月日

2019/1/1

原文摘要

Biochar has been considered a stable additive for long-term soil carbon (C) storage and climate change mitigation. However, our understanding of the long-term interactions between aged biochar, soil organic C (SOC), and fresh low molecular weight C compounds (LMW-C) is still limited. In addition to the changes in the chemical properties of biochar and the SOC after aging, biochar stability and C sequestration potentials might be affected by the LMW-C availability. After 3.5 years of incubation, aged soils and aged soil-biochar mixtures (4 atom‰ 13C enriched grass-derived biochar, 10% addition rate) of two different soil types were used in this study, with or without the addition of LMW-C. The 13C natural abundance of the LMW-C was manipulated by mixing cane sucrose (C4) and beet sugar (C3) to make it different from or equal to the native SOC isotopic signature of the two soil types, which allowed the partitioning of the LMW-C and biochar C from the SOC in non-biochar and biochar addition treatments, respectively. We traced the 13C in the cumulative CO2, microbial biomass C (MBC), and dissolved organic C (DOC) at the beginning and the end of the 28 days of incubation. Results indicated that this aged biochar was not as effective for SOC protection as it was when fresh. Aged biochar caused significant increases in the native SOC-derived CO2 compared to non-biochar treatment during the 3.5 years of aging. Within the 28 days of incubation, aged biochar not only promoted the total CO2 emission but also did not limit the priming effect of LMW-C on native SOC mineralization. SOC-derived DOC in the aged soil-biochar mixture was significantly higher than that in the aged soil, which further increased the SOC loss. A decline in the SOC stability with aged biochar might be associated with the attenuated sorption of SOC on aged biochar, the decline in bulk density with the high biochar addition rate, and a modified microbial community. The priming of aged SOC mineralization with the addition of LMW-C might be associated with the enhanced microbial N demand in aged soils and soil-biochar mixtures. The effect of aged biochar on the soil DOC and the effect of LMW-C on the aged biochar and SOC stabilities should be further investigated in field conditions, under continuous fresh C inputs, to better evaluate the effects of biochar on long-term SOC storage.

原文摘要簡述

生物炭被認為是長期土壤碳(C)儲存和減緩氣候變化的穩定添加劑。但是,我們對老化的生物炭,土壤有機碳(SOC)和新鮮的低分子量碳化合物(LMW-C)之間長期相互作用的理解仍然有限。除了老化後生物炭和土壤有機碳的化學特性發生變化外,LMW-C的可用性還可能影響生物炭的穩定性和碳吸存潛力。經過3.5年的潛伏期,本研究使用兩種土壤類型的老化土壤和老化土壤-生物炭混合物(4×atom‰13C富含草的生物炭,添加率為10%),添加或不添加LMW-C 。通過混合蔗糖(C4)和甜菜糖(C3)來控制LMW-C的13C自然豐度,使其不同於或等於兩種土壤類型的天然SOC同位素特徵,從而允許LMW分配在非生物炭和生物炭添加處理中分別來自SOC的-C和生物炭C。

關鍵字

Biochar aging, Fresh C inputs, C sequestration, Dissolved organic C, Soil N loss

連結

https://doi.org/10.1016/j.geoderma.2018.07.016

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