Next Article in Journal
Dynamics of Organic Matter in Leaf Litter and Topsoil within an Italian Alder (Alnus cordata (Loisel.) Desf.) Ecosystem
Previous Article in Journal
Considerations towards a Novel Approach for Integrating Angle-Count Sampling Data in Remote Sensing Based Forest Inventories
Previous Article in Special Issue
Analysis of Microbial Diversity and Greenhouse Gas Production of Decaying Pine Logs
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessFeature PaperArticle
Forests 2017, 8(7), 241; doi:10.3390/f8070241

The Response of Soil CO2 Efflux to Water Limitation Is Not Merely a Climatic Issue: The Role of Substrate Availability

1
Council for Agriculture Research and Economics, Centre for Forestry and Wood (CREA-FL), Viale Santa Margherita 80, 52100 Arezzo, Italy
2
Council for Agriculture Research and Economics, Research Centre for Agriculture and Environment (CREA-AA), Via di Lanciola 12, 50125 Firenze, Italy
3
Hungarian Academy of Sciences, Centre for Ecological Research Institute of Ecology and Botany, H-2163 Vácrátót, Hungary
4
University of Tuscia, Department for Innovation in Biological, Agro-food and Forest systems (DIBAF), Via S. Camillo de Lellis snc, 01100 Viterbo, Italy
5
National Research Council of Italy (CNR) Institute for Agro-Environment and Forest Biology (IBAF), Via Salaria km 29,300, 00015 Monterotondo Scalo, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Timothy A. Martin
Received: 22 April 2017 / Revised: 25 June 2017 / Accepted: 4 July 2017 / Published: 7 July 2017
View Full-Text   |   Download PDF [5261 KB, uploaded 11 July 2017]   |  

Abstract

Water availability, together with temperature, represents the most limiting abiotic factor regulating soil CO2 efflux (SR). Besides the direct effect of water limitation, drought also influences plant activity, determining changes in the quality and quantity of root exudates, thus indirectly affecting soil microbial activity. To determine how the seasonal changes of plant activity and soil microbial metabolism and structure affect SR response to drought, we investigated the correlation between leaf gas exchange, soil carbon pools and soil respiration sources and the role of soil carbon pools on microbial populations and soil respiration, in a summer deciduous Mediterranean (SDS) and a winter deciduous temperate (WDS) shrublands, experiencing a dry summer period. In both sites, drought reduced photosynthesis, but affected SR differently: in SDS, SR decreased, although microbial heterotrophic respiration (SRh) remained unchanged; in WDS, SR did not vary but SRh was reduced. While in SDS the microbial community was able to respire more complex substrates, in WDS it was strongly dependent on easily decomposable molecules, thus on plant activity. Therefore, the response of soil CO2 efflux to water limitation is not exclusively influenced by climate as it is modulated by the degree of adaptation of the microbial community to drought. View Full-Text
Keywords: soil CO2 efflux; drought; microbial community; substrate availability; photosynthesis; heterotrophic respiration soil CO2 efflux; drought; microbial community; substrate availability; photosynthesis; heterotrophic respiration
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

de Dato, G.; Lagomarsino, A.; Lellei-Kovacs, E.; Liberati, D.; Abou Jaoudé, R.; Marabottini, R.; Stazi, S.R.; Guidolotti, G.; Kovacs-Lang, E.; Kroel-Dulay, G.; De Angelis, P. The Response of Soil CO2 Efflux to Water Limitation Is Not Merely a Climatic Issue: The Role of Substrate Availability. Forests 2017, 8, 241.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Forests EISSN 1999-4907 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top