Soil Organic Carbon Sequestration Rates by Tillage and Crop Rotation

Soil Science Society of America Journal - Tập 66 Số 6 - Trang 1930-1946 - 2002
Tristram O. West1, W. M. Post1
1Environmental Sciences Division Oak Ridge National Lab. P.O. Box 2008 Oak Ridge TN 37831‐6335

Tóm tắt

Changes in agricultural management can potentially increase the accumulation rate of soil organic C (SOC), thereby sequestering CO2 from the atmosphere. This study was conducted to quantify potential soil C sequestration rates for different crops in response to decreasing tillage intensity or enhancing rotation complexity, and to estimate the duration of time over which sequestration may occur. Analyses of C sequestration rates were completed using a global database of 67 long‐term agricultural experiments, consisting of 276 paired treatments. Results indicate, on average, that a change from conventional tillage (CT) to no‐till (NT) can sequester 57 ± 14 g C m−2 yr−1, excluding wheat (Triticum aestivum L.)‐fallow systems which may not result in SOC accumulation with a change from CT to NT. Enhancing rotation complexity can sequester an average 20 ± 12 g C m−2 yr−1, excluding a change from continuous corn (Zea mays L.) to corn‐soybean (Glycine max L.) which may not result in a significant accumulation of SOC. Carbon sequestration rates, with a change from CT to NT, can be expected to peak in 5 to 10 yr with SOC reaching a new equilibrium in 15 to 20 yr. Following initiation of an enhancement in rotation complexity, SOC may reach a new equilibrium in approximately 40 to 60 yr. Carbon sequestration rates, estimated for a number of individual crops and crop rotations in this study, can be used in spatial modeling analyses to more accurately predict regional, national, and global C sequestration potentials.

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