Water relations and leaf chemistry of Chrysothamnus nauseosus ssp. consimilis (Asteraceae) and Sarcobatus vermiculatus (Chenopodiaceae)

Donovan, Lisa A.; Richards, James H.; Müller, M.

doi:10.1002/j.1537-2197.1996.tb12822.x

Cited by 33 publications

(37 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For some species, heterogeneous soil moisture conditions can lead to root-mediated hydraulic lift (or hydraulic redistribution) of water among soil layers (Caldwell et al 1998). Continued overnight water loss from some roots to soil can theoretically contribute to predawn disequilibrium, although this mechanism has not been empirically isolated (Donovan et al 1996(Donovan et al , 1999. Although outside of the scope of this study, mechanisms contributing to predawn disequilibrium under heterogeneous soil conditions deserve further experimental investigation.…”

Section: Introductionmentioning

confidence: 91%

“…Addington, unpublished data). For species that routinely grow under water stressed conditions in the field there were examples of no significant contribution (SAVI, SUMO) and large magnitude contribution of nighttime transpiration to predawn disequilibrium (ATCO, BAMA, LATR, SAVE) (Antlfinger and Dunn 1983;Caldwell 1985;Meinzer et al 1988;Donovan et al 1996;Dahlgren et al 1997).…”

Section: Nighttime Transpirationmentioning

confidence: 97%

See 1 more Smart Citation

Predawn plant water potential does not necessarily equilibrate with soil water potential under well-watered conditions

2001

View full text Add to dashboard Cite

Predawn leaf water potential (Ψ) and xylem pressure potential (Ψ) are expected to be in equilibrium with the soil water potential (soil Ψ) around roots of well-watered plants. We surveyed 21 plant species (desert, chaparral, and coastal salt marsh species, as well as two temperate tree and two crop species) for departures from this expectation and for two potential mechanisms explaining the departures. We measured soil Ψ, leaf Ψ, and xylem Ψ in the glasshouse under well-watered conditions that eliminated soil moisture heterogeneity and ensured good soil-root hydraulic continuity. Most species failed to equilibrate fully with soil Ψ, depending on whether leaf Ψ or xylem Ψ was used as the measure of predawn plant water potential. The contribution of nighttime transpiration to predawn disequilibrium was assessed by comparing plants with bagged canopies (enclosed overnight in plastic bags to eliminate transpiration) to plants with unbagged canopies. Nighttime transpiration significantly reduced predawn xylem Ψ for 16 of 21 species and the magnitude of this contribution to predawn disequilibrium was large (0.50-0.87 MPa) in four woody species: Atriplex confertifolia, Batis maritima, Larrea tridentata, and Sarcobatus vermiculatus. The contribution of nighttime transpiration to predawn disequilibrium was not more prevalent in mesic compared with xeric or desert phreatophytic compared with non-phreatophytic species. Even with bagging that eliminated nighttime transpiration, plants did not necessarily equilibrate with soil Ψ. Plant xylem Ψ or leaf Ψ were significantly more negative than soil Ψ for 15 of 15 species where soil Ψ was measured. Predawn disequilibrium based on leaf Ψ was of large magnitude (0.50-2.34 MPa) for seven of those 15 species, predominately halophytes and Larrea tridentata. A portion of the discrepancy between leaf and soil Ψ is consistent with the putative mechanism of high concentrations of leaf apoplastic solutes as previously modeled for a halophyte, but an additional portion remains unexplained. Predawn leaf Ψ and xylem Ψ may not reflect soil Ψ, particularly for woody plants and halophytes, even under well-watered conditions.

show abstract

Section: Introductionmentioning

confidence: 91%

Section: Nighttime Transpirationmentioning

confidence: 97%

Predawn plant water potential does not necessarily equilibrate with soil water potential under well-watered conditions

2001

View full text Add to dashboard Cite

show abstract

“…Roots of both species penetrate to the groundwater capillary fringe (Donovan et al 1996). Depth to groundwater was~3 m and fell 0.5 m from spring 2000 to fall 2002.…”

Section: Adult Shrubsmentioning

confidence: 98%

“…Depth to groundwater was~3 m and fell 0.5 m from spring 2000 to fall 2002. Soils and groundwater [electrical conductivity (EC)~1.5 dS m −1 ] are only marginally saline (Donovan et al 1996). Canopy dimensions for C. nauseosus and S. vermiculatus werẽ 130×170 cm (height, diameter) and 140×190 cm, respectively.…”

Section: Adult Shrubsmentioning

confidence: 99%

“…Chrysothamnus nauseosus and S. vermiculatus were selected at a successionally mature site with few juveniles (Diverse Dunes site,~275 m on the N-S transect, Donovan and Richards 2000;Toft and Elliott-Fisk 2002, same shrub populations as in Donovan et al 1996Donovan et al , 2003; see these references for soil and site characteristics). Roots of both species penetrate to the groundwater capillary fringe (Donovan et al 1996).…”

Section: Adult Shrubsmentioning

confidence: 99%

See 1 more Smart Citation

Extensive summer water pulses do not necessarily lead to canopy growth of Great Basin and northern Mojave Desert shrubs

et al. 2003

View full text Add to dashboard Cite

Plant species and functionally related species groups from arid and semi-arid habitats vary in their capacity to take up summer precipitation, acquire nitrogen quickly after summer precipitation, and subsequently respond with ecophysiological changes (e.g. water and nitrogen relations, gas exchange). For species that respond ecophysiologically, the use of summer precipitation is generally assumed to affect long-term plant growth and thus alter competitive interactions that structure plant communities and determine potential responses to climate change. We assessed ecophysiological and growth responses to large short-term irrigation pulses over one to three growing seasons for several widespread Great Basin and northern Mojave Desert shrub species: Chrysothamnus nauseosus, Sarcobatus vermiculatus, Atriplex confertifolia, and A. parryi. We compared control and watered plants in nine case studies that encompassed adults of all four species, juveniles for three of the species, and two sites for two of the species. In every comparison, plants used summer water pulses to improve plant water status or increase rates of functioning as indicated by other ecophysiological characters. Species and life history stage responses of ecophysiological parameters (leaf N, delta15N, delta13C, gas exchange, sap flow) were consistent with several previous short-term studies. However, use of summer water pulses did not affect canopy growth in eight out of nine comparisons, despite the range of species, growth stages, and site conditions. Summer water pulses affected canopy growth only for C. nauseosus adults. The general lack of growth effects for these species might be due to close proximity of groundwater at these sites, co-limitation by nutrients, or inability to respond due to phenological canalization. An understanding of the connections between short-term ecophysiological responses and growth, for different habitats and species, is critical for determining the significance of summer precipitation for desert community dynamics.

show abstract

Vegetation as affected by groundwater depth and microtopography in a shallow aquifer area of the Great Basin

Mata-González

McLendon²,

Martin³

et al. 2011

Ecohydrology

View full text Add to dashboard Cite

This study was designed to better define the nature of the relationship among vegetation, groundwater level and microtopography in an arid area where depth to groundwater (DTW) was 0–4 m. Plant cover, DTW and relative elevations were jointly measured along 67 vegetation transects throughout the Owens Valley, CA, USA. These transects were dominated by major species of the area: Artemisia tridentata, Atriplex torreyi, Ericameria nauseosa, Distichlis spicata, Juncus arcticus, Leymus triticoides, Sarcobatus vermiculatus and Sporobolus airoides. Plant species occurrence was associated with different DTW. J. arcticus and D. spicata occurred more frequently in areas with the shallowest groundwater (<1·5 m). A. torreyi, L. triticoides and E. nauseosa dominated areas with intermediate DTW (1·5–2·0 m); whereas S. airoides, S. vermiculatus and A. tridentata dominated areas with deeper water tables (>2·0 m). Species were also linked to different microtopographic positions: L. triticoides and J. arcticus were mainly restricted to depressions whereas A. torreyi and A. tridentata were widely distributed in higher positions on the microtopographical gradient. Only 6% of the variation in vegetation cover was accounted for by DTW throughout the study area (N = 820). Cover of individual species was usually unaffected by DTW variation. Results suggest that species distribution is linked to groundwater conditions, but cover of vegetation is only partially affected by DTW variation. This is possible because water tables in our study area are within the rooting depth of most species and plants appear to be well adapted to shallow DTW variations. Copyright © 2011 John Wiley & Sons, Ltd.

show abstract

Water relations and leaf chemistry of Chrysothamnus nauseosus ssp. consimilis (Asteraceae) and Sarcobatus vermiculatus (Chenopodiaceae)

Cited by 33 publications

References 42 publications

Predawn plant water potential does not necessarily equilibrate with soil water potential under well-watered conditions

Predawn plant water potential does not necessarily equilibrate with soil water potential under well-watered conditions

Extensive summer water pulses do not necessarily lead to canopy growth of Great Basin and northern Mojave Desert shrubs

Vegetation as affected by groundwater depth and microtopography in a shallow aquifer area of the Great Basin

Contact Info

Product

Resources

About