No consensus has been reached regarding the feedback of carbon (C) pools to climate warming in em... more No consensus has been reached regarding the feedback of carbon (C) pools to climate warming in empirical studies. This lack of consensus limits the accuracy to project the impacts of future climate warming on soil-stored C. To investigate the responses of C pools and C recalcitrance to climate change, we conducted a warming and clipping experiment since November, 1999 in a tallgrass prairie in Oklahoma, USA. Infrared heaters were used to increase soil temperatures by approximately 2 °C. Annual clipping was applied to mimic hay harvest. On average over the 8 years, from 2000 to 2008 (except 2006), warming decreased labile organic C (LOC, estimated by KMnO4 oxidation method) and its proportion to total C (TC) by 16.17% and 14.33% without clipping and 8.86% and 5.55% with clipping, respectively. No significant changes were found for TC and recalcitrant organic C (ROC, the difference between TC and LOC) with treatments. However, the proportion of ROC to TC significantly increased about ...
No consensus has been reached regarding the feedback of carbon (C) pools to climate warming in em... more No consensus has been reached regarding the feedback of carbon (C) pools to climate warming in empirical studies. This lack of consensus limits the accuracy to project the impacts of future climate warming on soil-stored C. To investigate the responses of C pools and C recalcitrance to climate change, we conducted a warming and clipping experiment since November, 1999 in a tallgrass prairie in Oklahoma, USA. Infrared heaters were used to increase soil temperatures by approximately 2 °C. Annual clipping was applied to mimic hay harvest. On average over the 8 years, from 2000 to 2008 (except 2006), warming decreased labile organic C (LOC, estimated by KMnO4 oxidation method) and its proportion to total C (TC) by 16.17% and 14.33% without clipping and 8.86% and 5.55% with clipping, respectively. No significant changes were found for TC and recalcitrant organic C (ROC, the difference between TC and LOC) with treatments. However, the proportion of ROC to TC significantly increased about ...
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