Oxygen Requirements for Root Growth in Three Species of Desert Shrubs

Lunt, O. R.; Letey, J.; Clark, Sue

doi:10.2307/1934199

Cited by 49 publications

(47 citation statements)

References 13 publications

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“…Pires & Koury (1958) studied in Combu Island appear to be caused by edaphic factors associated with topography. Specifically, reduced diversity and high representation of palms on topographically low sites may reflect lack of oxygen in the waterlogged soils of such sites, which limits the establishment and survival of seedlings of many plant species (Esau 1967, Lunt et al 1973, Crawford 1989. The vegetation on excessively humid sites frequently exhibits a high abundance of aerial roots and lenticels, which are believed to assist in absorption of oxygen (Winter 1976, Frangi & Lugo 1985.…”

Section: Resultsmentioning

confidence: 99%

<a name=top></a>Floristic composition and topographic variation in a tidal floodplain forest in the Amazon Estuary

Cattânio¹,

Anderson

Carvalho³

2002

Rev. bras. Bot.

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-(Floristic composition and topographic variation in a tidal floodplain forest in the Amazon Estuary). Slight topographic variations appear to exert dramatic effects on the structure of forests subject to inundation. In a late successional tidal floodplain forest near the Amazon port of Belém, Brazil, we examined these effects by studying floristic composition along a topographic gradient. We predicted that, relative to high sites, low sites would be characterized by high representation of life forms and taxa characteristic of inundated sites. We found striking variations in floristic composition along a slight topographic gradient. In comparison with topographically high sites, low sites were characterized by a high representation of Palm trees (Arecaceae), low diversity of trees and lianas, and high plant density. These variations appear to reflect edaphic limitations imposed by periodic flooding. The high spatial variation in floristic composition found in this ecosystem suggest caution in implementing intensive forms of agriculture.RESUMO -(Composição florística e variação topográfica em uma floresta de várzea no Estuário Amazônico). Pequena variação topográfica aparentemente exerce um dramático efeito na estrutura florestal sujeita à inundação. Em uma floresta de várzea em avançado estágio sucessional de perto do porto amazônico de Belém, Brasil, examinamos este efeito estudando a composição florística ao longo de um gradiente de topografia. Prevíamos que, relativo a locais altos, locais baixos seriam caracterizados por alta representação de formas de vida e táxons característicos de locais inundados. Encontramos impressionantes variações ao longo de um ligeiro gradiente de topografia. Em comparação com locais de topografia alta, locais baixos foram caracterizados por uma alta representação de palmeiras arbóreas (Arecaceae), baixa diversidade de árvores e cipós, e alta densidade de plantas. Esta variação reflete, aparentemente, limitações edáficas impostas pelo alagamento periódico. A alta variação espacial na composição florística encontrada neste ecossistema sugere precaução na implementação de formas intensivas de agricultura.

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Section: Resultsmentioning

confidence: 99%

<a name=top></a>Floristic composition and topographic variation in a tidal floodplain forest in the Amazon Estuary

Cattânio¹,

Anderson

Carvalho³

2002

Rev. bras. Bot.

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“…Alternatively, plants near washes could have shorter live spans, being perhaps intolerant to occasional bank overflow, flooding and erosive events. Larrea roots are known to be intolerant of excessive soil moisture (Lunt et al, 1973). Yet another explanation turns the causation around: younger, smaller Larrea are less likely to have formed mounds (e.g.…”

Section: Wash Effects On Larreamentioning

confidence: 99%

The influence of stream channels on distributions of Larrea tridentata and Ambrosia dumosa in the Mojave Desert, CA, USA: patterns, mechanisms and effects of stream redistribution

et al. 2011

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Drainage channels are among the most conspicuous surficial features of deserts, but little quantitative analysis of their influence on plant distributions is available. We analysed the effects of desert stream channels ('washes') on Larrea tridentata and Ambrosia dumosa density and cover on an alluvial piedmont in the Mojave Desert, based on a spatial analysis of transect data encompassing a total length of 2775 m surveyed in 5 cm increments. Significant deviations from average transect properties were identified by bootstrapping. Predictably, shrub cover and density were much reduced inside washes, and elevated above average levels adjacent to washes. Average Larrea and Ambrosia cover and density peaked 1Ð2-1Ð6 m and 0Ð5-1Ð0 m from wash edges, respectively. We compared wash effects in runon-depleted ( R) sections, where washes had been cut off from runon and were presumably inactive, with those in runon-supplemented (CR) sections downslope from railroad culverts to help identify mechanisms responsible for the facilitative effect of washes on adjacent shrubs. Shrub cover and density near washes peaked in both CR and R sections, suggesting that improved water infiltration and storage alone can cause a facilitative effect on adjacent shrubs. However, washes of <2 m width in CR sections had larger than average effects on peak cover, suggesting that plants also benefit from occasional resource supplementation. The data suggest that channel networks significantly contribute to structuring plant communities in the Mojave Desert and their disruption has notable effects on geomorphic and ecological processes far beyond the original disturbance sites.

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“…The injuries under stagnant condition occurred as a gradual manner probably for that reason meristematic zone shortening and cell rounding were also gradually observed. Lunt et al (1973) published that exposing roots to 0 percent 0 2 killed Artemisia tridentate and Larrea tridentata in 7 days and Fromseria dumosa in 9 days. In the present study, trifoliate orange roots were under injury and modification of meristematic region but root death was not found.…”

Section: Discussionmentioning

confidence: 99%

Anatomical Responses of Roots in Trifoliate Orange Budded with Satsuma Mandarin to Aerated and Stagnant Culture Solutions

Mohammad¹,

Shiraishi²

1999

Pakistan J. of Biological Sciences

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Anatomical responses of roots in trifoliate orange budded with satsuma mandarin (Citrus unshiu Marc. cv. Okitsu Wase) to aerated and stagnant culture solutions were investigated. Roots, under aerated condition, had sharply pointed tips and showed intact anatomical features having a few starch grains on the rootcap and cortical cells. The cortical cells were smaller close to the root tip and gradually became elongated towards the base. All these characteristics maintained the same level even up to 10 days of observations. On the contrary, under stagnant condition, secretion of mucilaginous substances and root tip injuries were found on the 3rd day of induction which became more conspicuous on the 5th. These injuries resulted the severe sloughing of cells and starch grain degradation in the rootcap. Eight day induced roots displayed more distinct root tip injuries and discharging of mucilaginous substances. On the 10th day, air spacing between the cortical cells were conspicuous. Epidermal injuries were also evidenced sporadically on the 5th day and became more severe subsequently. Degradation of starch grains gradually completed in the cortical cells along the exposure time. The enlargement of periblemic cells were noticed which gradually resulted larger cells close to the root apex on longer exposures.

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Oxygen Requirements for Root Growth in Three Species of Desert Shrubs

Cited by 49 publications

References 13 publications

<a name=top></a>Floristic composition and topographic variation in a tidal floodplain forest in the Amazon Estuary

<a name=top></a>Floristic composition and topographic variation in a tidal floodplain forest in the Amazon Estuary

The influence of stream channels on distributions of Larrea tridentata and Ambrosia dumosa in the Mojave Desert, CA, USA: patterns, mechanisms and effects of stream redistribution

Anatomical Responses of Roots in Trifoliate Orange Budded with Satsuma Mandarin to Aerated and Stagnant Culture Solutions

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