Biochar amendment to soil changes dissolved organic matter content and composition

生物炭 溶解有机碳 化学 环境化学 修正案 吸附 土壤水分 阳离子交换容量 有机质 浸出(土壤学) 土壤有机质 土壤pH值 总有机碳 热解 土壤科学 吸附 环境科学 有机化学 政治学 法学
作者
Andreas Botnen Smebye,Vanja Alling,Rolf D. Vogt,Tone Charlotte Gadmar,Jan Mulder,Gerard Cornelissen,Sarah E. Hale
出处
期刊:Chemosphere [Elsevier BV]
卷期号:142: 100-105 被引量:265
标识
DOI:10.1016/j.chemosphere.2015.04.087
摘要

Amendments of biochar, a product of pyrolysis of biomass, have been shown to increase fertility of acidic soils by enhancing soil properties such as pH, cation-exchange-capacity and water-holding-capacity. These parameters are important in the context of natural organic matter contained in soils, of which dissolved organic matter (DOM) is the mobile and most bioavailable fraction. The effect of biochar on the content and composition of DOM in soils has received little research attention. This study focuses on the effects of amendments of two different biochars to an acidic acrisol and a pH-neutral brown soil. A batch experiment showed that mixing biochar with the acrisols at a 10 wt.% dose increased the pH from 4.9 to 8.7, and this resulted in a 15-fold increase in the dissolved organic carbon concentration (from 4.5 to 69 mg L−1). The pH-increase followed the same trend as the release of DOM in the experiment, causing higher DOM solubility and desorption of DOM from mineral sites. The binding to biochar of several well-characterised reference DOM materials was also investigated and results showed a higher sorption of aliphatic DOM to biochar than aromatic DOM, with DOM-water partitioning coefficients (Kd-values) ranging from 0.2 to 590 L kg−1. A size exclusion occurring in biochar’s micropores, could result in a higher sorption of smaller aliphatic DOM molecules than larger aromatic ones. These findings indicate that biochar could increase the leaching of DOM from soil, as well as change the DOM composition towards molecules with a larger size and higher aromaticity.
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