Climate, carbon content, and soil texture control the independent formation and persistence of particulate and mineral-associated organic matter in soil

有机质 土壤有机质 土壤水分 土壤质地 环境化学 土壤碳 化学 碎石 淤泥 孵化 腐殖质 颗粒有机物 分解 微粒 垃圾箱 环境科学 总有机碳 农学 土壤科学 生态学 生物 古生物学 生物化学 有机化学
作者
Michelle L. Haddix,E. G. Gregorich,Bobbi L. Helgason,H. H. Janzen,Benjamin H. Ellert,Maurizio Cotrufo
出处
期刊:Geoderma [Elsevier BV]
卷期号:363: 114160-114160 被引量:182
标识
DOI:10.1016/j.geoderma.2019.114160
摘要

Understanding the mechanisms controlling the formation and persistence of soil organic matter (SOM) is important for managing soil health and sustainable food production. The formation of SOM and the degree to which it is protected from decomposition are important for determining the long-term persistence of SOM. We used soils collected in a 13C-labelled litter decomposition study established at agricultural sites in Canada to understand the formation and persistence of newly-formed SOM. The ten agricultural sites spanned a wide range of soil carbon contents, texture, and climatic conditions. We fractionated the soil to isolate water extractable organic matter (WEOM), free light POM (fPOM), sand-sized and occluded particulate organic matter (oPOM), and silt and clay sized particles, referred to as mineral-associated organic matter (MAOM). Quantitative isotope tracing was used to determine the litter-derived C in all fractions. We performed these analyses early (six months after incubation) and later (five years after incubation) in the decomposition process to evaluate factors that control the formation and persistence of POM and MAOM. After six months litter-derived C was found in all fractions, but after five years it had declined in all fractions except the MAOM. Formation of MAOM was related to high mean annual precipitation and low sand content, whereas occluded POM formation was related to high soil C content. Persistence of MAOM and POM during the incubation were associated with low soil temperature and high soil C content. There was no consistent indication that formation of MAOM occurred from the decomposition of POM, suggesting that MAOM and POM are formed by two separate pathways. This has important implications for SOC models, which assume that plant-derived C passes through a sequence of pools, becoming more stable along the way.
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