溶解有机碳是提高生物炭好氧堆肥过程中磷生物有效性的关键因素。
Dissolved organic carbon, a critical factor to increase the bioavailability of phosphorus during biochar-amended aerobic composting.
机构信息
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
出版信息
J Environ Sci (China). 2022 Mar;113:356-364. doi: 10.1016/j.jes.2021.06.019. Epub 2021 Jul 7.
Considerable research efforts have been devoted to increase phosphorus (P) availability during aerobic composting. However, there is little discussion weather the dissolved organic carbon (DOC) controls the transformation among P-fractions. Thus, we investigated the changes in DOC compositions and P-fractions during biochar-amended composting (wet weight basis, 5% and 10%). TP content continuously increased since the 'concentration effect' during aerobic composting. NaHCO-Pi, NaOH-Pi and HCl-Pi were main P-fractions, and biochar can improve P-bioavailability by transforming NaOH-Pi and HCl-Pi into NaHCO-Pi. Structure equation models (SEMs) indicated that biochar enhanced the P-bioavailability through regulating the decomposition of DOC. Our results at least hint that the activation mechanism on P under the influence of DOC during biochar-amended composting.
大量研究致力于提高好氧堆肥过程中磷（P）的有效性。然而，对于溶解有机碳（DOC）是否控制 P 形态之间的转化，讨论甚少。因此，我们研究了生物炭添加堆肥（湿重基础，5%和 10%）过程中 DOC 组成和 P 形态的变化。由于好氧堆肥过程中的“浓度效应”，总磷（TP）含量持续增加。NaHCO3-Pi、NaOH-Pi 和 HCl-Pi 是主要的 P 形态，生物炭可以通过将 NaOH-Pi 和 HCl-Pi 转化为 NaHCO3-Pi 来提高磷的生物有效性。结构方程模型（SEM）表明，生物炭通过调节 DOC 的分解来增强磷的生物有效性。我们的结果至少暗示了在生物炭添加堆肥过程中受 DOC 影响下 P 的激活机制。
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