Pine sawdust biomass and biochars at different pyrolysis temperatures change soil redox processes.
Pine sawdust biomass and biochars at different pyrolysis temperatures change soil redox processes.
复制标题
DOI：
10.1016/j.scitotenv.2017.12.194
复制
发表时间：
2018-06
期刊：
影响因子：
--
通讯作者：
Y. Awad;Y. Ok;J. Abrigata;Jingzi Beiyuan;Felix Beckers;Daniel C W Tsang;J. Rinklebe
中科院分区：
文献类型：
--
作者：
Y. Awad;Y. Ok;J. Abrigata;Jingzi Beiyuan;Felix Beckers;Daniel C W Tsang;J. Rinklebe
迄今为止，尚未开展任何研究来探讨不同热解温度下产生的生物炭对受污染漫滩土壤氧化还原电位 (EH) 和 pH 动态的影响。因此，我们的目的是量化用 70 t ha−1 松木屑生物质 (S&BM) 和在 300 °C (S&BC300) 和 550 °C (S&BC550) 热解并在自动化生物地球化学微观系统中预培养 105 天的生物炭处理的受污染淹没土壤中的 EH 和 pH 动态。还通过分析磷脂脂肪酸 (PLFA) 确定了微生物群落组成。我们发现，与未处理的污染土壤 (CS) 相比，BC300 和 BC550 处理的土壤 EH 平均值显着降低 (3–6.5%)，BM 增加 (~ 37%)。·S&BC550 中最大的 EH 下降速率为 10 h 时的 − 80 mV h−1。 S&BC300 中分别为 25 小时，S&BM 或 CS 中分别为 20-25 小时。在 highEH 下，与处理过的土壤相比，CS 中的 PLFA 总生物量和微生物群（71-87%）更高。 BC550 中的芳香度和灰分含量比 BC300 和 BM 更高，导致 PLFA 生物量和微生物群更大，这有助于提高土壤浆液中接受和捐赠电子的能力，这可能是 EH 最大下降的原因之一。松木屑生物质和碳黑对与氧化还原条件波动相关的土壤生物地球化学过程具有显着影响。
To date, no investigation has been carried out to explore the effects of biochars produced at different pyrolysis temperatures on the dynamics of redox potential (EH) and pH in a contaminated floodplain soil. Thus, we aimed to quantify the dynamics ofEHand pH in contaminated flooded soils treated with 70 t ha− 1of pine sawdust biomass (S&BM) and biochars pyrolyzed at 300 °C (S&BC300) and 550 °C (S&BC550) and pre-incubated for 105 days in an automated biogeochemical microcosm system. Microbial community composition was also determined via analyzing phospholipid fatty acid (PLFA).We found that BC300 and BC550 treatments substantially decreased (3–6.5%) and BM increased (~ 37%) the mean of soilEHcompared to the untreated contaminated soil (CS).·The largestEHdecline in S&BC550 was at the rate of − 80 mV h− 1at 10 h while it was observed at 25 h in S&BC300 and 20–25 h in S&BM or CS, respectively. At highEH, a higher total PLFA biomass and microbial groups in the CS (71–87%) were found in comparison to treated soils. Higher aromaticity and ash content in BC550 than BC300 and BM led to the greater PLFA biomass and microbial groups which contributed to higher capacity of accepting and donating electrons in soil slurry and were probably one reason for the largest decrease inEH. Pine sawdust biomass and BCs have a noticeable influence in soil biogeochemical processes relevant to fluctuating redox conditions.