scholarly journals Divergent species‐specific impacts of whole ecosystem warming and elevated CO 2 on vegetation water relations in an ombrotrophic peatland

2021 ◽  
Author(s):  
Jeffrey M. Warren ◽  
Anna M. Jensen ◽  
Eric J. Ward ◽  
Anirban Guha ◽  
Joanne Childs ◽  
...  
Keyword(s):  
Water Relations ◽  
Ombrotrophic Peatland ◽  
Vegetation Water ◽  
Species Specific

Xylem as the main origin of stem radius changes in Eucalyptus

2014 ◽  
Vol 41 (5) ◽  
pp. 520 ◽  
Author(s):  
Roman Zweifel ◽  
David M. Drew ◽  
Fritz Schweingruber ◽  
Geoffrey M. Downes
Keyword(s):  
Water Relations ◽  
Water Storage ◽  
Passive Layer ◽  
Specific Flow ◽  
Transport Efficiency ◽  
Art Interpretation ◽  
Main Driver ◽  
Additional Water ◽  
Species Specific ◽  
Slow Growing

The state-of-the-art interpretation of stem radius changes (DRTotal) for tree water relations is based on knowledge from mostly slow growing tree species. The ratio between diurnal size fluctuations of the rigid xylem (DRXylem) and the respective fluctuations of the elastic bark (DRBark) is known to be small (<0.4) and is of importance for the localisation of water storage dynamics in stems. In this study, fast growing Eucalyptus globulus Labill. in Tasmania were investigated by point dendrometers in order to investigate tree water relations. Unexpectedly, DRXylem was found to be the main driver of DRTotal with the bark acting as a passive layer on top of the fluctuating xylem under most conditions. Accordingly, the ratio between the diurnal fluctuations of the two tissues was found to be much higher (0.6–1.6) than everything reported before. Based on simulations using a hydraulic plant model, the high tissue-specific elasticity of the Eucalyptus xylem was found to explain this atypical response and not osmotically-driven processes or species-specific flow resistances. The wide zone of secondary thickening xylem in various stages of lignification is proposed to be an important component of the high wood elasticity. The tissue acts as additional water storage like the bark and may positively affect the water transport efficiency.

scholarly journals Plant performance on Mediterranean green roofs: interaction of species-specific hydraulic strategies and substrate water relations

AoB Plants ◽  
2015 ◽  
Vol 7 ◽  
Author(s):  
Fabio Raimondo ◽  
Patrizia Trifilò ◽  
Maria A. Lo Gullo ◽  
Sergio Andri ◽  
Tadeja Savi ◽  
...  
Keyword(s):  
Water Relations ◽  
Green Roofs ◽  
Plant Performance ◽  
Species Specific

The interaction between drought and elevated CO 2 in water relations in two grassland species is species-specific

2018 ◽  
Vol 220 ◽  
pp. 193-202 ◽  
Author(s):  
Jon Miranda-Apodaca ◽  
Usue Pérez-López ◽  
Maite Lacuesta ◽  
Amaia Mena-Petite ◽  
Alberto Muñoz-Rueda
Keyword(s):  
Water Relations ◽  
Grassland Species ◽  
Species Specific

Leaf tissue water relations in tree species from contrasting habitats within the upper Rio Negro forests of the Amazon region

2012 ◽  
Vol 28 (5) ◽  
pp. 519-522 ◽  
Author(s):  
M. A. Sobrado
Keyword(s):  
Water Relations ◽  
Water Availability ◽  
Tree Species ◽  
Leaf Tissue ◽  
Soil Characteristics ◽  
Local Scale ◽  
Tissue Water ◽  
Rio Negro ◽  
Contrasting Habitats ◽  
Species Specific

The landscape of the upper Rio Negro basin (North Amazon) exhibits distinctive habitats that are associated with differential soil characteristics and topographical conditions as well as species composition (Herrera et al. 1978). The mixed forests thrive on well-structured oxisols on slightly more elevated areas. The valleys with sandy podzols are occupied by the ‘Amazon caatinga’ complex with three distinct zones: the bottom valley and the gentle slopes, both of which have closed forests, and the sandy domes with open forests (‘bana’ or sclerophyllous forest; Breimer 1985). From the mixed forest towards the caatinga valley-slope-dome habitats, the leaf δ15N signatures become increasingly negative, suggesting a trend in N limitation in the same direction (Sobrado 2010). Thus, negative leaf δ15N signatures depleted in 15N compared with the soil indicate a very tight N cycle in all of the habitats. Water availability follows a similar pattern from the top of the oxisol towards the flooded valley bottom of the caatinga, with extreme water-table fluctuations in the sandy domes (Klinge 1978). Thus, parallel variation in nutrient and water availabilities exist in this area that are associated with soil characteristics and topography. Under such contrasting habitats, species-specific responses would be linked to particular conditions of the habitat at a local scale (Comita & Engelbrecht 2009, Engelbrecht et al. 2007). A number of studies in these habitats have shown that this is the case for soil fertility (Coomes 1997, Medina et al. 1990, Sobrado 2010, Sobrado & Medina 1980). Similarly, the hydraulic characteristics and long-term water use are species specific and related to particular conditions of the habitat at the local scale (Sobrado 2010). In this report, it was hypothesized that the leaf tissue water relations of species thriving in different habitats may reflect the water availability at the particular sites as well. The leaf tissue water relations of species thriving in the extreme nutrient and water-supply conditions of the sandy domes from the caatinga complex have been previously studied in detail (Sobrado 2009a). However, these data are currently not available for the species that thrive in the surrounding area of the closed forests, and importantly, such information would allow for a comparison across habitats. Therefore, the present study assessed the minimum leaf water potential (midday) under field conditions as well as the leaf tissue water relations by using pressure-volume analysis of dominant tree species in the top canopy of these high-stature forests.

scholarly journals A Species-Specific and spatially-Explicit Model for Estimating Vegetation Water Requirements in Desert Riparian Forest Zones

2016 ◽  
Vol 30 (11) ◽  
pp. 3915-3933 ◽  
Author(s):  
Guofu Yuan ◽  
Xuchao Zhu ◽  
Xinzhai Tang ◽  
Tao Du ◽  
Xiaobo Yi
Keyword(s):  
Riparian Forest ◽  
Spatially Explicit ◽  
Explicit Model ◽  
Water Requirements ◽  
Spatially Explicit Model ◽  
Desert Riparian Forest ◽  
Vegetation Water ◽  
Species Specific

Electron Microscopy in the Study of Natural Phytoplankton Assemblages

1985 ◽  
Vol 43 ◽  
pp. 620-623
Author(s):  
Linda Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Aquatic Environment ◽  
Size Range ◽  
Physical Parameters ◽  
Specific Information ◽  
Phytoplankton Assemblages ◽  
Phytoplankton Productivity ◽  
Ecosystem Effects ◽  
Time Of Year ◽  
Species Specific

Although the use of electron microscopy and its varied methodologies is not usually associated with ecological studies, the types of species specific information that can be generated by these techniques are often quite useful in predicting long-term ecosystem effects. The utility of these techniques is especially apparent when one considers both the size range of particles found in the aquatic environment and the complexity of the phytoplankton assemblages.The size range and character of organisms found in the aquatic environment are dependent upon a variety of physical parameters that include sampling depth, location, and time of year. In the winter months, all the Laurentian Great Lakes are uniformly mixed and homothermous in the range of 1.1 to 1.7°C. During this time phytoplankton productivity is quite low.

64: Rapid, Species-Specific Detection of Uropathogens from Clinical Urine Specimens Using an Electrochemical Microsensor Array

2005 ◽  
Vol 173 (4S) ◽  
pp. 18-18
Author(s):  
Joseph C. Liao ◽  
Mitra Mastali ◽  
David A. Haake ◽  
Bernard M. Churchill
Keyword(s):  
Specific Detection ◽  
Species Specific ◽  
Urine Specimens

Effects of chloride and sodium on gas exchange parameters and water relations of Citrus plants

1992 ◽  
Vol 86 (1) ◽  
pp. 115-123 ◽  
Author(s):  
J. Banuls ◽  
E. Primo-Millo
Keyword(s):  
Gas Exchange ◽  
Water Relations ◽  
Gas Exchange Parameters ◽  
Exchange Parameters
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