Dissolved organic carbon,a critical factor to increase the bioavailability of phosphorus during biochar-amended aerobic composting

• 作者: Hu Cui Yang Ou Lixia Wang Baixing Yan Yingxin Li Meiwen Bao
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2022,（3）
• 页码范围: 356-364
• 页数: 9页
• 语种: 英文

摘要

Considerable research efforts have been devoted to increase phosphorus (P) availability dur-ing 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 ef-fect'during aerobic composting.NaHCO3-Pi,NaOH-Pi and HCl-Pi were main P-fractions,and biochar can improve P-bioavailability by transforming NaOH-Pi and HCl-Pi into NaHCO3-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.