Microbial keystone taxa and nitrogen cycling enzymes driven by the initial quality of litter jointly promoted the litter decomposition rates in the Tengger Desert, northern China

IF 5 2区农林科学 Q1 SOIL SCIENCE Applied Soil Ecology Pub Date : 2025-02-10 DOI:10.1016/j.apsoil.2025.105919

Guisen Yang , Lei Huang , Wei Zhang , Yafei Shi , Zhiying Ning , Rui Hu , Zhishan Zhang

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Abstract

The initial quality of litter, specifically the chemical composition, is an important factor in determining litter decomposition rates (K). However, further investigation is imperative to elucidate the underlying mechanism governing the impact of initial litter quality on K. We conducted a 420-day field litter decomposition experiment in the artificial sand-binding vegetation area in the southeastern edge of the Tengger Desert. We measured the 5 typical sand-fixing plants initial chemical composition of litter, soil microbial community, soil extracellular enzyme activity (EEAs) after 420-day of litter decomposition. The initial chemical composition of litter is an important factor in determining the K, and the initial content of Nitrogen (N), Carbon (C), and cellulose in litter (Litter_PC2) increasing the abundance of positive taxa Ascomycota, Agromyces, and Preussia, while decreasing the abundance of negative taxa Chloroflexi, Gemmatimonadota, Chytridiomycota and Aspergillus, thereby collectively enhancing the activity of nitrogen cycling enzymes and oxidase, ultimately promoting K. The lignin, lignin/N, and C/N (Litter_PC1) enhance K through nitrogen cycling enzymes stimulating oxidase activity, but reduce microbial biomass carbon (MBC)/ microbial biomass nitrogen (MBN) further inhibit the activity of enzyme C/N, thereby inhibiting decomposition. Overall, the energy and nutrient of litter initial quality regulate K by influencing the microbial keystone taxa and EEAs, which provides reference for species selection and reasonable collocation of artificial sand-binding vegetation in sandy area and also provide a scientific foundation for future management and stability maintenance of artificial vegetation.

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微生物关键类群和凋落物初始质量驱动的氮循环酶共同促进了腾格里沙漠凋落物分解速率

摘要凋落物的初始质量，特别是化学成分，是决定凋落物分解速率(K)的重要因素，但需要进一步研究凋落物初始质量对凋落物分解速率(K)影响的潜在机制。测定了5种典型固沙植物凋落物分解420 d后的初始化学成分、土壤微生物群落、土壤胞外酶活性（EEAs）。凋落物的初始化学组成是决定凋落物K的重要因素，凋落物中氮(N)、碳(C)和纤维素的初始含量（LitterPC2）增加了阳性类群Ascomycota、Agromyces和Preussia的丰度，而降低了阴性类群Chloroflexi、Gemmatimonadota、Chytridiomycota和Aspergillus的丰度，从而共同增强了氮循环酶和氧化酶的活性，最终促进K。和C/N （LitterPC1）通过氮循环酶刺激氧化酶活性提高K，但减少微生物生物量碳(MBC)/微生物生物量氮（MBN）进一步抑制酶C/N的活性，从而抑制分解。综上所述，凋落物初始质量的能量和养分通过影响微生物关键类群和eea调控K，为沙区人工结沙植被的物种选择和合理配置提供参考，也为未来人工植被的管理和稳定维护提供科学依据。

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来源期刊

Applied Soil Ecology 农林科学-土壤科学

CiteScore

9.70

自引率

4.20%

发文量

363

审稿时长

5.3 months

期刊介绍： Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.