Comparing carbon fluxes between different stages of secondary succession of a karst grassland |
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| Authors: | M Ferlan G Alberti K Eler F Bati? A Peressotti F Miglietta A Zaldei P Simon?i? D Vodnik |
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| Institution: | 1. University of Ljubljana, Biotechnical Faculty, Ljubljana, Slovenia;2. Slovenian Forestry Institute, Ljubljana, Slovenia;3. Department of Agricultural and Environmental Sciences, University of Udine, Udine, Italy;4. CNR-IBIMET, Firenze, Italy;5. E. Mach Foundation, IASMA, San Michele all’Adige (TN), Italy;1. Egypt – Japan University of Science and Technology (E-JUST), Environmental Engineering Department, P.O. Box 179, New Borg El Arab City, Postal Code 21934, Alexandria, Egypt;2. National Research Centre, Water Pollution Research Department, P.O. Box 12622, Giza, Egypt;1. Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602, USA;2. US Geological Survey at National Wetlands Research Center, Lafayette, LA 70506, USA;1. State Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Urumqi 830011, China;2. General Station of Water and Soil Conversation and Ecoenvironmental Monitoring of Xinjiang, Urumqi 830000, China;1. Laboratório de Ecologia, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Caixa Postal 549, Campo Grande, Mato Grosso do Sul CEP, 79070-900, Brazil;2. Programa de Pós-graduação em Ecologia e Conservação, Universidade Federal de Mato Grosso do Sul, Caixa Postal 549, Campo Grande, Mato Grosso do Sul, CEP, 79070-900, Brazil;3. Amnis Opes Institute, Corvallis, OR 97333, USA;4. Department of Fisheries & Wildlife, Corvallis, OR 97331, USA;5. Faculdade de Ciências Biológicas e Ambientais, Universidade Federal da Grande Dourados, Dourados, Mato Grosso do Sul, Caixa Postal 364, CEP: 79, 804-970, Brazil;6. Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Caixa Postal 549, Campo Grande, Mato Grosso do Sul, CEP, 79070-900, Brazil;7. Neotropical Foundation of Brazil, Bonito, Mato Grosso do Sul, CEP 79, 290-000, Brazil;8. Centre for Tropical Environmental and Sustainability Science (TESS), James Cook University, Cairns, QLD 4878, Australia |
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| Abstract: | Abandonment of marginal agricultural areas with subsequent secondary succession is a widespread type of land use change in Mediterranean and mountain areas of Europe, leading to important environmental consequences such as change in the water balance, carbon cycling, and regional climate. Paired eddy flux measurement design with grassland site and tree/shrub encroached site has been set-up in the Slovenian Karst (submediterranean climate region) to investigate the effects of secondary succession on ecosystem carbon cycling. The invasion of woody plant species was found to significantly change carbon balance shifting annual NEE from source to an evident sink. According to one year of data succession site stored ?126 ± 14 g C m?2 y?1 while grassland site emitted 353 ± 72 g C m?2 y?1. In addition, the seasonal course of CO2 exchange differed between both succession stages, which can be related to differences in phenology, i.e. activity of prevailing plant species, and modified environmental conditions within forest fragments of the invaded site. Negligible effect of instrument heating was observed which proves the Burba correction in our ecosystems unnecessary. Unexpectedly high CO2 emissions and large disagreement with soil respiration especially on the grassland site in late autumn indicate additional sources of carbon which cannot be biologically processes, such as degassing of soil pores and caves after rain events. |
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