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Deep in the Sierra Nevada critical zone: saprock represents a large terrestrial organic carbon stock

التفاصيل البيبلوغرافية
العنوان: Deep in the Sierra Nevada critical zone: saprock represents a large terrestrial organic carbon stock
المؤلفون: Kimber Moreland, Zhiyuan Tian, Asmeret Asefaw Berhe, Karis J McFarlane, Peter Hartsough, Stephen C Hart, Roger Bales, Anthony T O’Geen
المصدر: Environmental Research Letters, Vol 16, Iss 12, p 124059 (2021)
بيانات النشر: IOP Publishing, 2021.
سنة النشر: 2021
المجموعة: LCC:Environmental technology. Sanitary engineering
LCC:Environmental sciences
LCC:Science
LCC:Physics
مصطلحات موضوعية: soil carbon, weathered bedrock, carbon biogeochemistry, saprock, deep soil carbon, carbon storage, Environmental technology. Sanitary engineering, TD1-1066, Environmental sciences, GE1-350, Science, Physics, QC1-999
الوصف: Large uncertainty remains in the spatial distribution of deep soil organic carbon (OC) storage and how climate controls belowground OC. This research aims to quantify OC stocks, characterize soil OC age and chemical composition, and evaluate climatic impacts on OC storage from the soil surface through the deep critical zone to bedrock. These objectives were carried out at four sites along a bio-climosequence in the Sierra Nevada, California. On average, 74% of OC was stored below the A horizon, and up to 30% of OC was stored in saprock (friable weakly weathered bedrock). Radiocarbon, spectroscopic, and isotopic analyses revealed the coexistence of very old organic matter (OM) (mean radiocarbon age = 20 300 years) with relatively recent OM (mean radiocarbon age = 4800 years) and highly decomposed organic compounds with relatively less decomposed material in deep soil and saprock. This co-mingling of OM suggests OC is prone to both active cycling and long-term protection from degradation. In addition to having direct effects on OC cycling, climate indirectly controls deep OC storage through its impact on the degree of regolith weathering (e.g. thickening). Although deep OC concentrations are low relative to soil, thick saprock represents a large, previously unrealized OC pool.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1748-9326
Relation: https://doaj.org/toc/1748-9326
DOI: 10.1088/1748-9326/ac3bfe
URL الوصول: https://doaj.org/article/5f51804b8f0d4ac2965d9465c1cce466
رقم الأكسشن: edsdoj.5f51804b8f0d4ac2965d9465c1cce466
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:17489326
DOI:10.1088/1748-9326/ac3bfe