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 

机构地区：[1]Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China [2]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 [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2022年第3期356-364,共9页环境科学学报（英文版）

基　　金：This research was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA23070502);the National Key Research and Development Program of China(No.2018YFD0500205).

摘　　要：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_(3)-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_(3)-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.

关 键 词：CO-COMPOSTING BIOCHAR Dissolved organic carbon Phosphorus fractions 

分 类 号：S141.4[农业科学—肥料学]