Song Shuhui, Liu Siru, Liu Yanan, Shi Lei, Li Huayong, Shi Weiqi, Ma Haiyang
Key Laboratory of Tropical Crops Nutrition of Hainan Province, South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang, Guangdong, China.
Front Microbiol. 2025 May 1;16:1573984. doi: 10.3389/fmicb.2025.1573984. eCollection 2025.
Tropical regions are characterized by high temperatures and abundant rainfall, which facilitate rapid carbon mineralization. However, research on soil organic carbon conversion efficiency (Esoc) in these areas is currently constrained by a lack of robust data support.
This study used nylon - bags with typical tropical organic materials (pineapple leaf (PAL), banana stems (BAS), coconut husk (CCH), and organic fertilizer (OF)) to explore how mixing straw with latosol impacts soil organic carbon conversion efficiency (Esoc) and products, and to understand the relationships among Esoc, material composition (glycolipid, hemicellulose, cellulose, lignin), and enzyme activity.
CCH had the highest Esoc, from 37.79% to 96.87%, followed by OF with 26.71%-63.12%. The Esoc of PAL and BAS was 34.57% and 25.32% at 90 days, and 7.59% and 2.55% at 1080 days. The main factor that determines the difference in carbon conversion efficiency is the composition of organic materials. Compared with CK treatment, the soil organic carbon for PAL and BAS at 90_days was mainly O-alkyl-C, anomertic-C, and N-alkyl/methoxyl-C, with an unstable structure. The decomposition products of CCH mainly consisted of anomertic-C, aromatic-C, O-alkyl-C, carbonyl-C, and N-alkyl/methoxyl-C. The increased organic carbon in OF - mixed soil was mainly N-alkyl/methoxyl-C and anomertic-C. In the short-term (90 days), PAL, BAS, and OF increased the quantity and diversity of soil microorganisms, as well as the activities of xylosidase and cellobiohydrolase. CCH mainly enhanced soil phenol oxidase activity and maintained microbial biomass stabilityin the long-term (1080 days).
This study revealed the changes of microbial diversity and enzyme activity under different organic materials. The promotion effects of PAL and BAS on microbial biomass, diversity and enzyme activity in the short term and the maintenance effects of CCH on the stability of microbial biomass in the later period were investigated, which provided a new basis for further exploring the function and mechanism of microorganisms in soil ecosystems.
热带地区的特点是高温多雨，这有利于碳的快速矿化。然而，目前这些地区土壤有机碳转化效率（Esoc）的研究受到缺乏有力数据支持的限制。
本研究使用装有典型热带有机物料（菠萝叶（PAL）、香蕉茎（BAS）、椰壳（CCH）和有机肥（OF））的尼龙袋，探讨秸秆与红壤混合对土壤有机碳转化效率（Esoc）及其产物的影响，并了解Esoc、物质组成（糖脂、半纤维素、纤维素、木质素）和酶活性之间的关系。
CCH的Esoc最高，为37.79%至96.87%，其次是OF，为26.71%-63.12%。PAL和BAS在90天时的Esoc分别为34.57%和25.32%，在1080天时分别为7.59%和2.55%。决定碳转化效率差异的主要因素是有机物料的组成。与对照处理相比，PAL和BAS在90天时土壤有机碳主要为O-烷基-C、异常-C和N-烷基/甲氧基-C，结构不稳定。CCH的分解产物主要由异常-C、芳香-C、O-烷基-C、羰基-C和N-烷基/甲氧基-C组成。OF混合土壤中增加的有机碳主要是N-烷基/甲氧基-C和异常-C。在短期（90天）内，PAL、BAS和OF增加了土壤微生物的数量和多样性，以及木糖苷酶和纤维二糖水解酶的活性。CCH主要增强了土壤酚氧化酶活性，并在长期（1080天）内维持了微生物生物量的稳定性。
本研究揭示了不同有机物料下微生物多样性和酶活性的变化。研究了PAL和BAS在短期内对微生物生物量、多样性和酶活性的促进作用以及CCH在后期对微生物生物量稳定性的维持作用，为进一步探索微生物在土壤生态系统中的功能和机制提供了新的依据。
