NDLI: Seasonal water-use efficiency and chlorophyll fluorescence response in alpha grass (Stipa tenacissima L.) is affected by tussock size

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Seasonal water-use efficiency and chlorophyll fluorescence response in alpha grass (Stipa tenacissima L.) is affected by tussock size

Content Provider	Springer Nature Link
Author	Ramírez, D. A. Valladares, F. Domingo, F. Bellot, J.
Copyright Year	2008
Abstract	Twelve randomly chosen Stipa tenacissima L. individuals were grouped into three tussock size classes, small (ST), medium (MT), and large (LT) with 5.6±0.8, 34.1±4.2, and 631.9±85.8 g of dry green foliar matter, respectively, in three plots with different S. tenacissima cover. Instantaneous (WUE$_{i}$) and long-term (WUE$_{l}$) water-use efficiencies were measured in two seasons of contrasting volumetric soil water content (early winter 21.0±0.8 % and summer 5.8±0.3 %). Maximum photochemical efficiency of photosystem 2 and stomatal conductance in summer assessed the extent of water and irradiance stress in tussocks of different size. WUE$_{i}$ was lower in MT and ST “water spender” strategies than in LT during the high water-availability season. In summer net photosynthetic rate and WUE$_{i}$ were higher and photoinhibition was lower in LT than in MT and ST. Significant spatial variability was found in WUE$_{i}$. Water uptake was competitive in stands with denser alpha grass and more water availability in summer, reducing their WUE$_{i}$. However, WUE$_{l}$ showed a rising tendency when water became scarce. Thus it is important to explicitly account for plant size in ecophysiological studies, which must be combined with demographic information when estimating functional processes at stand level in sequential scaling procedures.
Starting Page	222
Ending Page	231
Page Count	10
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	46
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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