Relationship between net photosynthesis and leaf respiration in Mediterranean evergreen species |
| |
Authors: | L Gratani L Varone R Catoni |
| |
Institution: | (1) Department of Plant Biology, Sapienza University of Rome, P. le A. Moro 5, 00185 Rome, Italy |
| |
Abstract: | The relationship between net photosynthetic (P
N) and leaf respiration (R) rates of Quercus ilex, Phillyrea latifolia, Myrtus communis, Arbutus unedo, and Cistus incanus was monitored in the period February 2006 to February 2007. The species investigated had low R and P
N during winter, increasing from March to May, when mean air temperature reached 19.2 °C. During the favourable period, C. incanus and A. unedo had a higher mean P
N (16.4±2.4 μmol m−2 s−1) than P. latifolia, Q. ilex, and M. communis (10.0±1.3 μmol m−2 s−1). The highest R (1.89±0.30 μmol m−2 s−1, mean of the species), associated to a significant P
N decrease (62 % of the maximum, mean value of the species), was measured in July (mean R/P
N ratio 0.447±0.091). Q10, indicating the respiration sensitivity to short-term temperature increase, was in the range 1.49 to 2.21. Global change
might modify R/P
N determining differences in dry matter accumulation among the species, and Q. ilex and P. latifolia might be the most favoured species by their ability to maintain sufficiently higher P
N and lower R during stress periods. |
| |
Keywords: | Additional" target="_blank">Additional Arbutus Cistus Myrtus Phillyrea Q10 Quercus seasonal course temperature |
本文献已被 SpringerLink 等数据库收录! |
|