Coupled Biological and Abiotic Mechanisms Driving Carbonyl Sulfide Production in Soils
Coupled Biological and Abiotic Mechanisms Driving Carbonyl Sulfide Production in Soils
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DOI：
10.3390/soilsystems2030037
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发表时间：
2018-06
期刊：
影响因子：
3.5
通讯作者：
L. Meredith;K. Boye;Connor Z. Youngerman;M. Whelan;J. Ogée;J. Sauze;L. Wingate
中科院分区：
文献类型：
--
作者：
L. Meredith;K. Boye;Connor Z. Youngerman;M. Whelan;J. Ogée;J. Sauze;L. Wingate
了解土壤中微量气体羰基硫（OCS）的产生是将其用作生态系统功能示踪剂的关键。其应用的基础是观察到，维管植物消耗大气OCS通过其气孔与CO2光合作用的比例和OCS的土壤通量是可以忽略不计的比较。最近以土壤为中心的研究表明，土壤可以产生OCS，并贡献多达四分之一的大气陆地通量。尽管土壤OCS排放的潜在的广泛的重要性，现有的数据不足，以预测在OCS生产跨生态系统的变化，和OCS生产的化学和生物驱动程序几乎是未知的。在这项研究中，我们通过调查控制OCS土壤生产的变量，包括土壤的物理和化学性质，微生物群落组成和硫形态在两个独立的调查，解决了这一知识差距。我们发现，土壤OCS生产几乎无处不在的58个站点，随着温度呈指数级增加，是不敏感的可见光调节。土壤pH值，N，和C/N的OCS土壤生产率的预测土壤调查。土壤中硫的形态和预测的微生物S-循环途径的模式都指向含S的氨基酸，如半胱氨酸和蛋氨酸及其衍生物作为OCS生产的潜在前体。硫酸盐水平升高与某些土壤中接触CS的产生有关。这项研究提供了新的机制深入了解OCS在土壤中的生产，并提出了战略，以代表土壤OCS通量，促进使用OCS作为示踪剂的叶级过程相关的碳和水循环。
Understanding soil production of the trace gas carbonyl sulfide (OCS) is key to its use as a tracer of ecosystem function. Underlying its application is the observation that vascular plants consume atmospheric OCS via their stomatal pores in proportion with CO2 photosynthesis and that soil fluxes of OCS are negligible in comparison. Recent soil-centered studies demonstrate that soils can produce OCS and contribute as much as a quarter of the atmospheric terrestrial flux. Despite the potential widespread importance of soil OCS emissions, insufficient data exist to predict variations in OCS production across ecosystems, and the chemical and biological drivers of OCS production are virtually unknown. In this study, we address this knowledge gap by investigating variables controlling OCS soil production including soil physical and chemical properties, microbial community composition, and sulfur speciation in two independent surveys. We found that soil OCS production was nearly ubiquitous across the 58 sites, increased exponentially with temperature, and was insensitive to visible light conditioning. Soil pH, N, and C/N were predictors of OCS soil production rates in both soil surveys. Patterns in soil S speciation and predicted microbial S-cycling pathways both pointed to S-containing amino acids such as cysteine and methionine and their derivatives as potential precursors for OCS production. Elevated sulfate levels were associated with OCS production in some soils. This study provides new mechanistic insight into OCS production in soils and presents strategies to represent soil OCS fluxes that facilitate the use of OCS as a tracer for leaf-level processes related to carbon and water cycling.