Anais do XXXIV Congresso Brasileiro de Ciência do Solo

DEEP SOIL CARBON: A DYNAMIC, UNMEASURED POOL IN TERRESTRIAL ECOSYSTEMS

ROBERT BOYD HARRISON⁽¹⁾; JASON JAMES⁽¹⁾; IRAÊ MARAL GUERRINI⁽²⁾;
1 - UNIVERSITY OF WASHINGTON; 2 - UNIVERSIDADE ESTADUAL PAULISTA - UNESP;

Carbon calculations indicate that soils are more important than plants as reservoirs of C but rarely receive adequate attention. When soil pools are quantified they are typically sampled to relatively shallow depths to reduce study costs. This study assessed the potential of soil sampling to estimate carbon in the soil profile. Soil pits at twenty-two locations in Washington and Oregon were dug. Sites were selected from University of Washington Stand Management Cooperative (SMC) Type V long term site productivity plots (LTSPs) and then classified. All sites are intensively managed Douglas-fir (Pseudotsuga menziesii) plantations. Results showed that where soils were sampled to at least 80 cm or more depth 27–77% of mineral soil C was found > 20 cm in depth. To quantify soil C pools is recommended to sample soil profiles as deeply as possible and not assume that deeper soil horizons are not a critical part of adequate ecosystem analysis.

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