粘土矿物的加入加速了生物簇的形成,并有可能提高碳储存能力

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE Soil & Tillage Research Pub Date : 2024-10-03 DOI:10.1016/j.still.2024.106316
Shiqi Wang , Xinyu Li , Yuqing Li , Fanjian Zeng , Longkat Ayuba Gufwan , Lie Yang , Ling Xia , Shaoxian Song , María Luciana Montes , Mariela Alejandra Fernandez , Bin Zheng , Li Wu
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引用次数: 0

摘要

沙漠地区普遍存在的生物簇在缓解土壤退化、塑造共同的自然景观方面发挥着关键作用。然而,在气候变化和人类活动的影响下,生物簇覆盖面正面临退化的风险。恢复退化的生物簇和建造人工生物簇被认为是应对土壤退化的有前途的技术。尽管粘土矿物是生物簇形成过程中的重要非生物因素,并直接影响生物簇的发展和演替,但它们并未得到广泛关注。本研究旨在探究粘土矿物在生物簇中的作用机制。研究人员将不同数量的海泡石与蓝藻(蓝藻干重与海泡石重量之比分别为 1:0、1:10、1:20、1:50、1:100)混合,构建人工生物簇,并观察其形成和发展过程。结果表明,与对照组(比例为 1:0)相比,添加少量的海泡石(比例为 1:10 和 1:20)不仅能促进蓝藻生物量(1.47-1.86 倍)和外聚糖(EPS)(1.73-2.58 倍)的积累,还能显著提高总碳、总有机碳和微生物生物量碳的积累,从而突出了其在提高生物簇固碳能力方面的潜力。扫描电子显微镜(SEM)分析表明,海泡石在生物簇结构中起到了 "接收器和桥梁 "的作用,增强了生物簇结构的紧凑性和稳定性,从而促进了蓝藻的生长并促进了营养物质的运输。此外,傅立叶变换红外光谱(FTIR)和 X 射线光电子能谱(XPS)分析显示,EPS 和海泡石在混合后某些官能团发生了变化,从而验证了 EPS 可作为一种 "粘合剂 "来统一颗粒。我们的研究结果表明,粘土矿物的加入可以促进生物簇的形成,提供了一种实用而经济的方法,为构建人工生物簇和恢复退化的沙漠土壤提供了一个新的视角。
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The inclusion of clay minerals accelerates biocrust formation and potentially boosts carbon storage capabilities
Biocrusts, prevalent in desert areas, play a pivotal role in mitigating soil degradation, shaping a common natural landscape. However, amidst climate change and human activities, biocrust coverage is encountering the risk of degradation. The restoration of degraded biocrusts and the construction of artificial ones are regarded as promising technologies for combating soil degradation. Although clay minerals are a crucial abiotic factor in biocrust formation and are directly influence their development and succession, they have not gained widespread attention. The aim of this study was to investigate the mechanism of action of clay minerals in biocrusts. Various quantities of sepiolite were amalgamated with cyanobacteria—Microcoleus vaginatus (ratios of 1:0, 1:10, 1:20, 1:50, 1:100; cyanobacteria dry weight to sepiolite weight), to construct artificial biocrusts and observe the formation and development of them. The results showed that the addition of small quantities of sepiolite (ratios of 1:10 and 1:20) not only facilitated the accumulation of cyanobacterial biomass (1.47–1.86 times) and exopolysacchrides (EPS) (1.73–2.58 times) compared to the control (ratio of 1:0), but also notably enhanced the accumulation of total carbon, total organic carbon, and microbial biomass carbon, highlighting its potential in enhancing the carbon sequestration capabilities of biocrusts. Scanning electron microscope (SEM) analysis revealed that sepiolite serves as a “receiver and bridge” within the biocrust structure, enhancing its compactness and stability, thereby fostering the growth of cyanobacteria and facilitating nutrient transport. Further, Fourier Transform Infrared (FTIR) and X-Ray Photoelectron Spectroscopy (XPS) analysis reviewed changes in some functional groups of EPS and sepiolite after mixing, validating that EPS can function as a “binder” to unify particles. Our findings demonstrate that the incorporation of clay minerals can facilitate biocrust formation, presenting a practical and economical approach, and providing a novel perspective for constructing artificial biocrusts and rehabilitating degraded desert soils.
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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