ABSTRACT

This work aimed to study the impacts of long-term pig slurry (PS) amendment by soil organic matter (SOM) structural characterization. The study was conducted over 5 years in an experimental field with PS amendment. Two doses (50 m³ ha⁻¹ and 100 m³ ha⁻¹) of PS were applied to soil twice every year, once before planting the winter crop (Avena strigosa Schreb. + Lolium multiflorum Lam.) and once before planting the summer crop (Zea mays L.). SOM modifications were studied by compositional and spectroscopic analyses. Differences between the fractions were obtained using chemometrics methods. PS amendment of the soil caused increases in the amount of total soil carbon and the humic fraction depending on the duration of PS amendment. Humic acids (HAs) and fulvic acids (FAs) functional groups were modified under both rates of PS amendment. The PS amendment modified the HAs and FAs structure in the first year, and in the last year, the higher application rate (100 m³ ha⁻¹) caused more intense modifications than in earlier years. The cluster and MCR analysis proved that carbohydrate and peptide structures (C_Alkyl-O,N; C_Alkyl-O; C_Alkyl-di-O), lignin (C_Arom-H,R; C_Arom-O,N) and lignocellulosic carbon were incorporated into the soil HAs and FAs structures.

摘要

这项工作旨在通过土壤有机质 (SOM) 结构表征研究长期猪粪 (PS) 改良的影响。该研究在 PS 修正的实验领域进行了超过 5 年。每年两次将两剂（50 m ³ ha ^-1和 100 m ³ ha ^-1）的 PS 施用于土壤，一次在种植冬季作物之前（Avena strigosa Schreb. + Lolium multiflorum Lam.），一次在种植夏季之前作物（玉米L.)。通过成分和光谱分析研究了 SOM 修饰。使用化学计量学方法获得级分之间的差异。土壤的 PS 改良导致土壤总碳量和腐殖质分数的增加，这取决于 PS 改良的持续时间。腐殖酸 (HAs) 和富里酸 (FAs) 官能团在两种 PS 修正率下都进行了修饰。PS 修正案在第一年修改了 HAs 和 FAs 的结构，而在去年，较高的施用量（100 m ³ ha ^-1）引起了比前几年更强烈的修改。簇和 MCR 分析证明碳水化合物和肽结构（C_烷基-O，N；C_烷基-O；C_烷基-di -O)、木质素 (C _Arom -H,R; C _Arom -O,N) 和木质纤维素碳被纳入土壤 HAs 和 FAs 结构中。