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Spatial and temporal variations in diurnal CO₂ fluxes of different Mediterranean ecosystems in Turkey

Content Provider	Royal Society of Chemistry (RSC)
Author	Aydın, Mehmet Evrendilek, Fatih Ben-Asher, Jiftah Çelik, Ismail
Copyright Year	2005
Abstract	Diurnal rates of net CO2 assimilation (PN) and soil respiration (Rh) in the summer were measured in six Mediterranean ecosystems through an automatic continuous monitoring system. The six sites include a typical evergreen Pinus pinea L. forest with two co-occurring sclerophyllous shrubs (Pistacia terebinthus L. and Phillyrea latifolia L.), citrus (Citrus limon L.), corn (Zea mays L.), cotton (Gossypium hirsutum L.), soybean (Glycine max L.) and vineyard (Vitis vinifera L.). All six sites exhibited similar behaviour in that low soil water availability and high evaporative demand not only depressed PN and Rh rates, but also changed the diurnal time course of their peak rates. Except for P. terebinthus and corn, PN rates of all the species peaked in the morning (7:30–9:30), and Rh rates in all the sites were higher during the night than during the day (p < 0.05). Mean rates of net ecosystem emission (NEE) of CO2 to the atmosphere were highest (−23.9 μmol CO2 m−2 s−1) in the corn site and lowest (−0.6 μmol CO2 m−2 s−1) in the vineyard site. On average, all six ecosystems were a net source of CO2 to the atmosphere, due to Rh effluxes exceeding PN rates. Net CO2 assimilation and Rh explained 25% (for corn) to 87% (for citrus) of the diurnal fluctuations of the atmospheric CO2 concentration. Multiple linear regression (MLR) models accounted for 42% (P. pinea) to 95% (cotton) of diurnal variations in PN rates and 30% (forest) to 92% (citrus) of diurnal variations in Rh rates (p ⩽ 0.001). The dependence of diurnal PN and Rh rates on water vapour pressure deficit and soil water deficit for dry and hot summer days appeared to be major and needs to be re-examined for biogeochemical models of climate change effects on CO2 dynamics of Mediterranean ecosystems.
Starting Page	151
Ending Page	157
Page Count	7
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	7
Issue Number	2
Journal	Journal of Environmental Monitoring
DOI	10.1039/b415152f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Zea Rh Mediterranean Phillyrea Cellular respiration Mediterranean climate Evergreen Pine Pistacia terebinthus Citrus Lemon Maize Gossypium Gossypium hirsutum Soybean Vineyard Vitis vinifera Diurnal cycle Terebinthus Ecosystem Linear regression Correlation and dependence Vapor pressure Hot Summer Days Biogeochemistry Climate change
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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