Deciphering the bioavailability of dissolved organic matter in thermophilic compost and vermicompost at the molecular level
文献类型： 外文期刊
作者： Wang, Dingmei 1 ; Mai, Liwen 1 ; Yu, Zhen 4 ; Wang, Kongtan 1 ; Meng, Ze 3 ; Wang, Xiongfei 3 ; Li, Qinfen 1 ; Lin, Jiacong 1 ; Wu, Dongming 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Hainan Key Lab trop Eco Circuling Agr, Haikou 571101, Peoples R China
2.Minist Agr & Rural Affairs, Key Lab Low Carbon Green Agr Trop Reg China, Haikou 571101, Peoples R China
3.Hainan Soil & Fertilizer Stn, Haikou 571100, Peoples R China
4.Guangdong Acad Sci, Inst Eco Environm & Soil Sci, Guangzhou 510650, Peoples R China
5.Hainan Univ, Inst Ecol & Environm, Haikou 570228, Peoples R China
6.Natl Observat & Res Stn, Natl Agr Expt Stn Agr Environm Trop Agroecosyst, Danzhou 571737, Peoples R China
7.4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China
关键词： Compost; Dissolved organic matter; Bioavailability; Molecular composition; C/N ratio
期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：11.4； 五年影响因子：10.6 ）
ISSN： 0960-8524
年卷期： 2024 年 391 卷
页码：
收录情况： SCI
摘要： Studies on compost dissolved organic matter (DOM) previously focus on its composition and humification, without considering DOM bioavailability to understand compost fertility. To decipher the fertility basis of compost, DOM bioavailability in thermophilic compost (TC) and vermicompost (VC) was investigated and linked with its molecular composition. Results showed that DOM bioavailability of VC (36 % BDOC) was generally higher than that of TC (22 % BDOC) due to containing more tannin-like substances. Inversely, only lipid -/car-bohydrate-/protein-like substances contributed to DOM bioavailability in TC. Moreover, these differences of bioavailability expanded with C/N decreased in composting materials. Specifically, the %BDOC of VC with N -rich materials (C/N < 25) was 2.1-3.0 times higher than that in TC, while it was only 1.2-1.4 times for C-rich materials (C/N < 25), because N-surplus facilitated the formation of O-/N-containing aromatics (e.g., CHON and tannin) in VC, but inhibited the decomposition of organic materials into small bioactive molecules in TC.
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