玉米增加,而其生物炭减少了亚热带森林土壤中本地有机碳矿化
Jiashu Zhou1, Shaobo Zhang2, Junyan Lv1
1State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China.
The Science of the total environment
|June 1, 2024
概括
玉米增加了土壤碳损失,而生物炭增加了莫索竹林的土壤碳储量. 这种差异是由于微生物对有机物质量反应的对比,影响土壤有机碳 (SOC) 矿化.
科学领域:
- 土壤科学 土壤科学
- 农业林业是农业林业的一部分.
- 生物地质化学生物地质化学
背景情况:
- 有机土壤修改对于增加农林系统中的土壤有机碳 (SOC) 是至关重要的.
- 燃烧性 (生物炭) 与新鲜有机物对原生SOC矿化的明显影响尚不清楚.
- 研究微生物机制是了解土壤碳循环对修正案反应的关键.
研究的目的:
- 为了比较玉米草及其生物炭对莫索竹林本土SOC矿化的影响.
- 通过分析SOC质量,微生物基因和酶活动,阐明控制这些对比效应的机制.
主要方法:
- 使用莫索竹林土进行了为期80天的化实验.
- 治疗包括玉米,从玉米中提取的生物炭和对照.
- 测量包括土壤有机碳 (SOC) 的数量和质量,微生物基因表达 (GH48,cbhI,cbbL),酶活性 (β-葡萄糖酶,细胞氧化酶,脱酶,RubisCO) 和二氧化碳排放量.
主要成果:
- 玉米显著增加了SOC衍生的本地二氧化碳排放 (积极原始化),与较高的O-基C,增加的酶活性 (BG,CBH,DH) 和特定微生物基因丰度 (GH48,cbhI) 相关.
- 生物炭显著降低了SOC衍生的本地CO2排放 (负原始化),与更高的芳香C,减少的酶活性和较低的微生物基因丰度相关.
- 这两项修正案都改变了SOC的组成和微生物群落的功能,导致了不同的矿化反应.
结论:
- 增加玉米草刺激了莫索竹林土壤中的本地SOC矿化 (正原始化).
- 生物炭的添加抑制了原生SOC矿化 (负原始化),这表明它有可能增强土壤碳库存.
- 对变化的SOC物种化和组成进行对比的微生物反应调解了新鲜与热性有机物之间的原始化效应.
相关概念视频
01:26Microbes and Methanogenesis
91
Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
91
01:29Soil Microbial Ecology
83
Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...
83
01:27Microbes and Climate Change
91
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
91
01:25Biofuels
107
The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
107