作物残渣
生物炭
肥料
化学
稻草
残留物(化学)
溶解有机碳
木质素
农学
土壤碳
绿肥
有机质
土壤有机质
环境化学
土壤改良剂
肥料
土壤水分
热解
环境科学
有机化学
土壤科学
生物
农业
无机化学
生态学
作者
Shuotong Chen,Xin Xia,Feng Xiao,Qingmei Lin,Genxing Pan
摘要
Abstract The chemodiversity and thermodynamic stability of dissolvable organic matter (DOM) in paddy soil under different crop residue managements remain unclear. Using Fourier transform ion cyclotron resonance mass spectrometry (FT‐ICR‐MS) analysis, we explored the molecular composition of DOM in paddy soil 4 years following incorporation of maize residue in different forms (air‐dried straw, manure and biochar). Compared to the control without amendments, manure increased the pool size of DOM but reduced its chemodiversity, while the straw and biochar amendments reduced the pool size but increased the chemodiversity of DOM by 0.22 and 0.05, respectively. Though approximately 60% of the compounds were shared among the treatments, those distinct among the treatments were shaped by residue‐derived lignin‐like compounds. Moreover, the nominal oxidation state of carbon (NOSC), which corresponds to the energy content in organic carbon, decreased with the maize residue amendments, regardless of the forms. Thus, crop residue amendments could lead to higher DOM persistence in the short‐term, potentially slowing carbon turnover in paddy soil.
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