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Title: Tracing the source of soil organic matter eroded from temperate forest catchments using carbon and nitrogen isotopes

Journal Article · · Chemical Geology
 [1]; ORCiD logo [1];  [2];  [3];  [4];  [1];  [1]
  1. Univ. of California, Merced, CA (United States)
  2. U.S. Dept. of Agriculture, Fresno, CA (United States)
  3. Univ. of Nevada, Reno, NV (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, soil erosion continuously redistributes soil and associated soil organic matter (SOM) on the Earth's surface, with important implications for biogeochemical cycling of essential elements and terrestrial carbon sequestration. Despite the importance of soil erosion, surprisingly few studies have evaluated the sources of eroded carbon (C). We used natural abundance levels of the stable and radioactive isotopes of C (13C and 14C) and stable isotope of nitrogen (15N) to elucidate the origins of SOM eroded from low-order catchments along the western slopes of the Sierra Nevada of California, USA. Our work was conducted in two relatively undisturbed catchments (low elevation = 1800 m, and high elevation = 2300 m) of the Kings River Experimental Watersheds (KREW) in the Sierra National Forest. Sediment captured in basins at the outlet of each gauged watershed were compared to possible source materials, which included: upland surficial organic horizons (i.e., forest floor) and mineral soils (0–0.6 m) from three landform positions (i.e., crest, backslope, and toeslope), stream bank soils (0–0.6 m), and stream-bed materials (0–0.05 m). We found that most of the organic matter (OM) in the captured sediments was composed of O-horizon material that had high C concentrations. Radiocarbon analyses also showed that the captured OM is composed of modern (post-1950) C, with fraction modern values at or above 1.0. Our results suggest that surface (sheet) erosion, as opposed to channeling through established streams and episodic mass wasting events, is likely the largest source of sediment exported out of these minimally disturbed, headwater catchments. The erosional export of sediment with a high concentration of C, especially in the form of relatively undecomposed litter from the O horizon, suggests that a large fraction of the exported C is likely to be decomposed during or after erosion; hence, it is unlikely that soil erosion acts as a significant net sink for atmospheric CO2 in these low-order, temperate forest catchments.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); USDA
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1368004
Report Number(s):
LLNL-JRNL-691043
Journal Information:
Chemical Geology, Vol. 445, Issue C; ISSN 0009-2541
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Cited By (11)

Sediment Fingerprinting Suggests Differential Suspended Particulate Matter Formation and Transport Processes Across Hydrologic Regimes journal April 2018
Stabilization Mechanisms and Decomposition Potential of Eroded Soil Organic Matter Pools in Temperate Forests of the Sierra Nevada, California journal January 2019
Temperature and moisture are minor drivers of regional-scale soil organic carbon dynamics journal April 2019
Southern Sierra Critical Zone Observatory and Kings River Experimental Watersheds: A Synthesis of Measurements, New Insights, and Future Directions journal January 2018
Pyrogenic Carbon Erosion: Implications for Stock and Persistence of Pyrogenic Carbon in Soil journal March 2018
Effects of Pretreatment Methods of Wheat Straw on Adsorption of Cd(II) from Waterlogged Paddy Soil journal January 2019
Quantifying nutrient uptake as driver of rock weathering in forest ecosystems by magnesium stable isotopes journal January 2017
Spatially distributed water-balance and meteorological data from the rain–snow transition, southern Sierra Nevada, California journal January 2018
Thermal alteration of soil organic matter properties: a systematic study to infer response of Sierra Nevada climosequence soils to forest fires journal January 2017
Temperature and moisture are minor drivers of regional-scale soil organic carbon dynamics text January 2019
Thermal alteration of soil organic matter properties: a systematic study to infer response of Sierra Nevada climosequence soils to forest fires journal September 2016

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