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Title: Soil evaporation and organic matter turnover in the Sub-Taiga and Forest-Steppe of southwest Siberia

Journal Article · · Scientific Reports
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [4];  [5]; ORCiD logo [6];  [7];  [8];  [7]
  1. Leibniz Center for Agricultural Landscape Research, Müncheberg (Germany). Inst. for Landscape Biogeochemistry; Univ. of Idaho, Moscow, ID (United States). Dept. of Soil and Water Systems; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for Accelerator Mass Spectrometry (CAMS)
  2. INRA, Champenoux (France); INRA, Villenave d'Ornon (France).; Bordeaux Sciences Agro, Villenave d'Ornon (France)
  3. Federal Inst. for Geosciences and Natural Resources (BGR), Hannover (Germany)
  4. Inst. of Soil Science and Agrochemistry, Novosibirsk (Russian Federation)
  5. INRA, Champenoux (France); Inst. of Soil Science and Agrochemistry, Novosibirsk (Russian Federation)
  6. INRA, Villenave d'Ornon (France).; Bordeaux Sciences Agro, Villenave d'Ornon (France)
  7. INRA, Champenoux (France)
  8. INRA, UREP, Clermont Ferrand (France)

Southwest Siberia encompasses the forest-steppe and sub-taiga climatic zones and has historically been utilized for agriculture. Coinciding with predicted changes in climate for the region is the pressure of agricultural development; however, a characterization of the soil water and carbon dynamics is lacking. We assessed current soil water properties and soil organic carbon turnover in forests and grasslands for two sites that span the forest steppe and sub-taiga bioclimatic zones. Soil evaporation was 0.62±0.17mm d-1 (mean±standard error) in grasslands and 0.45±0.08mm d-1 in the forests of the forest-steppe site. Evaporation at the sub-taiga site was 1.80±1.70mm d-1 in grasslands and 0.96±0.05mm d-1 in forest plots. Evaporation was significantly greater at the sub-taiga site than the forest-steppe site. The density of fine roots explained the soil water isotopic patterns between vegetation types and sites. We found soil organic matter turnover to be three times faster in the sub-taiga site than in the forest-steppe site. Our results show that while climate factors, in particular snow levels, between the two sites are drivers for water and carbon cycles, site level hydrology, soil characteristics, and vegetation directly interact to influence the water and carbon dynamics.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth and Environmental Systems Science Division
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1624409
Journal Information:
Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (12)