Evaporation from Banksia woodland on a groundwater mound

Farrington, P.; Greenwood, E. A. N.; Bartle, G.A.; Beresford, J.D.; Watson, G.D.

doi:10.1016/0022-1694(89)90102-9

Cited by 49 publications

(33 citation statements)

References 4 publications

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“…Jackson et al 1996;Schenk and Jackson 2002) rarely sampled the whole rooting depth as done in the present study. Therefore in deep-rooted ecosystems such as the Banksia woodlands in Western Australia, where root systems extend beyond 2.5 m (Low and Lamont 1990) and as deep as 4-8 m (Farrington et al 1989), the true β values are expected to be higher than those reported in Jackson et al (1996). A higher β value for the model will imply a deeper root system than predicted by the current model, and further deviation between the predicted and observed root depth distribution.…”

Section: Discussionmentioning

confidence: 73%

“…The dominant species at the present study site grow on coastal dune sandy soils in places where rainfall is often quite low and highly seasonal. As a result, such species are known to rapidly develop deep root systems that access subsurface moisture and/or shallow groundwater (Farrington et al 1989;Low and Lamont 1990;Pate et al 1998). The observed high concentration of fine roots in the top 40-cm depth, and a shallow rooting depth of 150 cm were highly unexpected for a 4-year old woody stand.…”

Section: Discussionmentioning

confidence: 99%

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Spatial analysis of fine root distribution on a recently constructed ecosystem in a water-limited environment

et al. 2011

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1) to investigate the spatial distribution of fine roots and its correlation with selected soil properties on an artificial ecosystem dominated by woody vegetation species, and (2) to compare the root distribution to that predicted using a global model for natural ecosystems. Root diameter distribution (≤5 mm), root biomass density (RBD), root length density (RLD), soil pH, soil electrical conductivity and dry soil bulk density were measured on soil core samples (217) collected from a trench wall using a 20×20-cm grid sampling. Approximately 90% of the RBD (mean ± standard error: 0.27±0.027 kg m −3 ) and RLD (1.57±0.023 cm cm −3 ) occurred in the top 40 cm, decreasing exponentially to a maximum rooting depth of 150 cm. RBD exhibited a vertical spatial structure associated with soil pH (p<0.05; r 2 = 0.48), and a random lateral distribution. Coefficients of variation (CV) of RBD were high irrespective of orientation (vertical: 79-200%, lateral: 50-236%). The root extinction parameter β (0.944) for the global model was lower (p<0.05) than that of woodlands (β= 0.964-0.976), indicating a shallow root distribution resembling that of grasslands (β=0.943). The superficial root distribution indicated subsoil chemical constraints to root growth, while high lateral variability was attributed to sparse vegetation. The findings stress the need to account for both vertical and lateral variability of roots for accurate modelling of water use and productivity on certain artificial ecosystems with sparse vegetation.Keywords Global root distribution model . Vegetated engineered cover . Root biomass density . Root diameter distribution . Root length density Abbreviations ECSoil electrical conductivity in 1:5 soil to water suspension Plant Soil (2011) 344:255-272

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Spatial analysis of fine root distribution on a recently constructed ecosystem in a water-limited environment

et al. 2011

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“…In addition, there is some evidence to suggest that this site (depth to water table) is proximal to the upper limit in depth to groundwater access for B. attenuata. Farrington et al (1989) measured B. attenuata and B. menziesii root lengths per unit volume of soil at a depth to groundwater of 8.3-9 m and 11-12 m. Results showed that roots were present down to a depth of 8 m, but below this depth, root abundance was very low. Therefore decreased groundwater use by upper slope trees in summer may be a result of groundwater dropping to levels where root abundance is low.…”

Section: Discussionmentioning

confidence: 97%

Influence of groundwater depth on the seasonal sources of water accessed by Banksia tree species on a shallow, sandy coastal aquifer

et al. 2002

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In Mediterranean ecosystems vegetation overlying shallow, transient aquifers is often dominated by woody phreatophytes, trees and shrubs that have been shown to be dependent on groundwater for their water requirements. Natural and anthropogenic alterations of groundwater tables (abstraction) are of clear importance to phreatophytic vegetation as reduction of water tables may sever these plants from their natural water sources. Seasonal water sources were determined for species growing on a coastal dune system that overlies a shallow sandy aquifer in south-western Australia. The plants studied grew over groundwater that ranged in depth from 2.5 to 30 m. The naturally occurring stable isotope of hydrogen (deuterium, δH) was used to distinguish potential water sources. Isotopic ratios from vascular water of the dominant species of the study area (Banksia ilicifolia R. Br. and Banksia attenuata R. Br. trees) were compared with those of potential sources of precipitation, soil moisture and groundwater. A relatively shallow-rooted perennial shrub, Hibbertia hypericoides Benth., was also included as an isotopic reference. The results suggest that both B. attenuata and B. ilicifolia are phreatophytic as they derived some of their water from groundwater throughout the dry-wet cycle, with the exception of B. attenuata at the site of greatest depth to groundwater (30 m) which did not use groundwater. A high proportion (>50%) of groundwater use was not maintained throughout all seasons. With the onset of the hot Mediterranean summer, progressive drying of the surface soils resulted in increased use of groundwater and deep soil moisture. During the wet winter plants used proportionately more water from the upper layers of the soil profile. The degree to which groundwater was utilised by the study species was dependent on the proximity of groundwater, availability of moisture in shallower horizons of the soil profile, root system distribution and maximum root depth.

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“…7c shows upper threshold value (1,600 kg m −3 ) for normal root growth (Warrick 2002) and highly seasonal. As a result, such species are known to rapidly develop deep root systems that access subsurface moisture and/or shallow groundwater (Farrington et al 1989;Low and Lamont 1990;Pate et al 1998). The observed high concentration of fine roots in the top 40-cm depth, and a shallow rooting depth of 150 cm were highly unexpected for a 4-year old woody stand.…”

Section: Discussionmentioning

confidence: 99%

Spatial analysis of fine root distribution on a recently constructed ecosystem in a water-limited environment

et al. 2011

View full text Add to dashboard Cite

Aims: (1) to investigate the spatial distribution of fine roots and its correlation with selected soil properties on an artificial ecosystem dominated by woody vegetation species, and (2) to compare the root distribution to that predicted using a global model for natural ecosystems. Methods: Root diameter distribution (e5 mm), root biomass density (RBD), root length density (RLD), soil pH, soil electrical conductivity and dry soil bulk density were measured on soil core samples (217) collected from a trench wall using a 20×20-cm grid sampling.Results: Approximately 90% of the RBD (mean ± standard error: 0.27±0.027 kg m −3 ) and RLD (1.57± 0.023 cm cm −3 ) occurred in the top 40 cm, decreasing exponentially to a maximum rooting depth of 150 cm. RBD exhibited a vertical spatial structure associated with soil pH (p<0.05; r 2 =0.48), and a random lateral distribution. Coefficients of variation (CV) of RBD were high irrespective of orientation (vertical: 79-200%, lateral: 50-236%). The root extinction parameter β (0.944) for the global model was lower (p<0.05) than that of woodlands (β=0.964-0.976), indicating a shallow root distribution resembling that of grasslands (β=0.943). Conclusions: The superficial root distribution indicated subsoil chemical constraints to root growth, while high lateral variability was attributed to sparse vegetation. The findings stress the need to account for both vertical and lateral variability of roots for accurate modelling of water use and productivity on certain artificial ecosystems with sparse vegetation.Keywords Global root distribution model . Vegetated engineered cover . Root biomass density . Root diameter distribution . Root length density Plant Soil (2011) 348:471-489

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Evaporation from Banksia woodland on a groundwater mound

Cited by 49 publications

References 4 publications

Spatial analysis of fine root distribution on a recently constructed ecosystem in a water-limited environment

Spatial analysis of fine root distribution on a recently constructed ecosystem in a water-limited environment

Influence of groundwater depth on the seasonal sources of water accessed by Banksia tree species on a shallow, sandy coastal aquifer

Spatial analysis of fine root distribution on a recently constructed ecosystem in a water-limited environment

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