Abstract：
This study investigated the effects of the nitrogen retention composite additives Ca(H2PO4)2 and MgSO4 on lignocellulose degradation, maturation, and fungal communities in composts. The study included control (C, without Ca(H2PO4)2 and MgSO4), 1% Ca(H2PO4)2 + 2% MgSO4 (CaPM1), 1.5% Ca(H2PO4)2 + 3% MgSO4 (CaPM2). The results showed that Ca(H2PO4)2 and MgSO4 enhanced the degradation of total organic carbon (TOC) and promoted the degradation of lignocellulose in compost, with CaPM2 showing the highest TOC and lignocellulose degradation. Changes in the three-dimensional excitation-emission matrix fluorescence spectroscopy (3D-EEM) of dissolved organic matter (DOM) components in compost indicated that the treatment group with the addition of Ca(H2PO4)2 and MgSO4 promoted the production of humic acids (HAs) and increased the degree of compost decomposition, with CaPM2 demonstrating the highest degree of decomposition. The addition of Ca(H2PO4)2 and MgSO4 modified the composition of the fungal community. Ca(H2PO4)2 and MgSO4 increased the relative abundance of Ascomycota, decreased unclassified_Fungi, and Glomeromycota, and activated the fungal genera Thermomyces and Aspergillus, which can degrade lignin and cellulose during the thermophilic stage of composting. Ca(H2PO4)2 and MgSO4 also increased the abundance of Saprotroph, particularly undefined Saprotroph. In conclusion, the addition of Ca(H2PO4)2 and MgSO4 in composting activated fungal communities involved in lignocellulose degradation, promoted the degradation of lignocellulose, and enhanced the maturation degree of compost.
摘要：
本研究研究了氮保留复合添加剂Ca（H2PO4）2和MgSO4对木质纤维素降解的影响，成熟,和堆肥中的真菌群落。研究包括对照（C，不含Ca(H2PO4)2和MgSO4)，1%Ca(H2PO4)2+2%MgSO4(CaPM1)，1.5%Ca(H2PO4)2+3%MgSO4(CaPM2)。结果表明,Ca(H2PO4)2和MgSO4增强了堆肥中总有机碳(TOC)的降解,促进了堆肥中木质纤维素的降解,CaPM2表现出最高的TOC和木质纤维素降解。堆肥中溶解有机物(DOM)组分的三维激发-发射基质荧光光谱(3D-EEM)变化表明,添加Ca(H2PO4)2和MgSO4的处理组促进了腐殖酸(HAs)的产生,增加了堆肥分解程度,CaPM2表现出最高的分解程度。Ca（H2PO4）2和MgSO4的添加改变了真菌群落的组成。Ca（H2PO4）2和MgSO4增加了子囊的相对丰度，减少未分类的真菌，和肾小球,并激活了真菌热霉菌属和曲霉属，在堆肥的高温阶段可以降解木质素和纤维素。Ca（H2PO4）2和MgSO4也增加了腐生的丰度，特别是未定义的Seprotrophh。总之,在堆肥中添加Ca（H2PO4）2和MgSO4激活的真菌群落参与木质纤维素降解，促进了木质纤维素的降解，提高了堆肥的成熟度。
