the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Carbon input control over soil organic matter dynamics in a temperate grassland exposed to elevated CO2 and warming
Abstract. Elevated CO2 generally increases soil C pools. However, greater available C concentrations can potentially stimulate soil organic matter (SOM) decomposition. The effects of climate warming on C storage can also be positive or negative. There is a high degree of uncertainty on the combined effects of climate warming and atmospheric CO2 increase on SOM dynamics and its potential feedbacks to climate change. Semi-arid systems are predicted to show strong ecosystem responses to both factors. Global change factors can have contrasting effects for different SOM pools, thus, to understand the mechanisms underlying the combined effects of multiple factors on soil C storage, effects on individual C pools and their kinetics should be evaluated. We assessed SOM dynamics by conducting long-term laboratory incubations of soils from PHACE (Prairie Heating and CO2 Enrichment experiment), an elevated CO2 and warming field experiment in semi-arid, native northern mixed grass prairie, Wyoming, USA. We measured total C mineralization and estimated the size of the labile pool and the decomposition rates of the labile and resistant SOM pools. To examine the role of plant inputs on SOM dynamics we measured aboveground biomass, root biomass, and soil dissolved organic C (DOC). Greater aboveground productivity under elevated CO2 translated into enlarged pools of readily available C (measured as total mineralized C, labile C pool and DOC). The effects of warming on the labile C only occurred in the first year of warming suggesting a transient effect of the microbial response to increased temperature. Experimental climate change affected the intrinsic decomposability of both the labile and resistant C pools. Positive relationships of the rate of decomposition of the resistant C with aboveground and belowground biomass and dissolved organic C suggested that plant inputs mediated the response by enhancing the degradability of the resistant C. Our results contribute to a growing body of literature suggesting that priming is a ubiquitous phenomenon that should be included in C cycle models.
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RC C265: 'review', Anonymous Referee #1, 19 Mar 2010
- AC C315: 'Reply to anonymus reviewer #1', Yolima Carrillo, 25 Mar 2010
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RC C346: 'Review Comments on bgd-7-1575-2010', Anonymous Referee #2, 29 Mar 2010
- AC C1189: 'Reply to anonymus referee no. 2', Yolima Carrillo, 28 May 2010
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RC C439: 'Comments on: Carbon input control over soil organic matter dynamics in a temperate grassland exposed to elevated CO2 and warming', Anonymous Referee #3, 06 Apr 2010
- AC C1196: 'Reply to anonymus referee no. 3', Yolima Carrillo, 28 May 2010
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EC C1014: 'Editor comment on bg-2010-44', Michael Bahn, 19 May 2010
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AC C1199: 'Response to Editor Comments', Yolima Carrillo, 28 May 2010
- EC C1221: 'Response to Reply by Authors', Michael Bahn, 01 Jun 2010
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AC C1199: 'Response to Editor Comments', Yolima Carrillo, 28 May 2010
-
RC C265: 'review', Anonymous Referee #1, 19 Mar 2010
- AC C315: 'Reply to anonymus reviewer #1', Yolima Carrillo, 25 Mar 2010
-
RC C346: 'Review Comments on bgd-7-1575-2010', Anonymous Referee #2, 29 Mar 2010
- AC C1189: 'Reply to anonymus referee no. 2', Yolima Carrillo, 28 May 2010
-
RC C439: 'Comments on: Carbon input control over soil organic matter dynamics in a temperate grassland exposed to elevated CO2 and warming', Anonymous Referee #3, 06 Apr 2010
- AC C1196: 'Reply to anonymus referee no. 3', Yolima Carrillo, 28 May 2010
-
EC C1014: 'Editor comment on bg-2010-44', Michael Bahn, 19 May 2010
-
AC C1199: 'Response to Editor Comments', Yolima Carrillo, 28 May 2010
- EC C1221: 'Response to Reply by Authors', Michael Bahn, 01 Jun 2010
-
AC C1199: 'Response to Editor Comments', Yolima Carrillo, 28 May 2010
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Cited
4 citations as recorded by crossref.
- Alterations in forest detritus inputs influence soil carbon concentration and soil respiration in a Central-European deciduous forest I. Fekete et al. 10.1016/j.soilbio.2014.03.006
- Positive climate feedbacks of soil microbial communities in a semi‐arid grassland M. Nie et al. 10.1111/ele.12034
- Enhancing soil carbon storage for carbon remediation: potential contributions and constraints by microbes G. King 10.1016/j.tim.2010.11.006
- Effects of Climate Change on Soil Organic Matter C and H Isotope Composition in a Mediterranean Savannah (Dehesa): An Assessment Using Py-CSIA L. San-Emeterio et al. 10.1021/acs.est.3c01816