期刊
PLANT CELL AND ENVIRONMENT
卷 33, 期 11, 页码 1898-1910出版社
WILEY
DOI: 10.1111/j.1365-3040.2010.02193.x
关键词
climate change; maximum carboxylation rate; mesophyll conductance; photosynthesis; rainfall exclusion; stomatal conductance
资金
- Agence Nationale de la Recherche [ANR-06-VULN-003-01]
- European project CARBO-EXTREME [226701, FP7-ENV-2008-1]
Global climate change is expected to result in more frequent and intense droughts in the Mediterranean region. To understand forest response to severe drought, we used a mobile rainfall shelter to examine the impact of spring and autumn rainfall exclusion on stomatal (S-L) and non-stomatal (NSL) limitations of photosynthesis in a Quercus ilex ecosystem. Spring rainfall exclusion, carried out during increasing atmospheric demand and leaf development, had a larger impact on photosynthesis than autumn exclusion, conducted at a time of mature foliage and decreasing vapour pressure deficit. The relative importance of NSL increased with drought intensity. S-L and NSL were equal once total limitation (T-L) reached 60%, but NSL greatly exceeded S-L during severe drought, with 76% NSL partitioned equally between mesophyll conductance (MCL) and biochemical (B-L) limitations when T-L reached 100%. Rainfall exclusion altered the relationship between leaf water potential and photosynthesis. In response to severe mid-summer drought stress, A(n) and V-cmax were 75% and 72% lower in the spring exclusion plot than in the control plot at the same pre-dawn leaf water potential. Our results revealed changes in the relationship between photosynthetic parameters and water stress that are not currently included in drought parameterizations for modelling applications.
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