Krasnozems - a profile

Isbell, R. F.

doi:10.1071/sr9940915

Cited by 33 publications

(26 citation statements)

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“…The rainforest is on a ridge with similar topography and morphology as the experimental plot. The soil in the plots and the rainforest belongs to the same Ferrosol soil order (Isbell, 1994;Gillman and Abel, 1987;Gillman and Sinclair, 1987;Murtha, 1986). This soil is red to brown, acidic, well structured clay formed on basalt, with deep profiles ranging from 1 to >10 m. The clay content is relatively high (62% to 68%), and the silt and organic matter contents range from 21% to 16% and 2.0% to 0.6%, respectively.…”

Section: Experimental Design and Forest Species Usedmentioning

confidence: 97%

The impact of deforestation and pasture abandonment on soil properties in the wet tropics of Australia

Rasiah¹,

Florentine²,

Williams³

et al. 2004

Geoderma

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Limited information exists on the changes in soil properties, particularly from the wet tropics of Australia, under long-term abandoned pasture, which was previously grazed and was established on deforested tropical rainforest. This information may be help in successful forest reestablishment. The objectives of this study were to assess the cumulative impact deforestation, grazed and abandoned pasture on selected soil physico-chemical properties from (i) an abandoned pastureland and (ii) a recently planted rainforest (PRF), planted in the abandoned pastureland. The experimental site is a field in the Northeast Queensland (NEQ) wet tropical region of Australia. This site was deforested approximately 70 years ago and brought under unfertilized grazed pasture for 30 years. Subsequently the grazed pastureland was abandoned and remains un-grazed for 40 years. A section of the abandoned pastureland was planted, 10 years ago, with native forest species, involving different combinations in five treatments in a completely randomised block design. A nearby undisturbed rainforest is used as the background against which assessment was carried out. Soil samples from 0-to 15-cm depth were collected in July 2000 and analyzed for nitrate-N, ammonium-N, total N, total soil organic C (SOC) and labile-C, pH (in water and CaCl 2 ), electrical conductivity (EC), exchangeable Ca, Mg, Na, K, and Al, and bulk density. Compared to the rainforest, the N and C concentrations of different forms under abandoned pasture and PRF were significantly less, exclusive of the total N under abandoned pasture. More specifically, the SOC under the abandoned pasture was 37,600 mg/kg compared with 74,800 mg/kg under rainforest and 27,000 mg/kg in the PRF. The exchangeable Al under rainforest was 8.5 c mol c /kg compared with 42.4 to 80.2 c mol c /kg under abandoned pasture and PRF. In general exchangeable cations (sum of Ca, Mg, K, and Na) under the rainforest were higher than the abandoned pasture. Soil under the abandoned pasture and PRF are more acidic by 0.5 to 1 units than the rainforest. Higher bulk densities under abandoned pasture and PRF led to 0.03% to 0.07% reductions in total porosities. Though we did not anticipate the soil under the abandoned pasture to recover 100% in 30 -40 years, the results indicate that 40 years under abandoned pasture or 30 years of abandoned pasture plus 10 years under PRF was not sufficient to bring about substantial improvement in soil properties comparable to the rainforest. This implies the resiliency of tropical soils, in general, to recover from deforestation and cultivation induced degradation is poor. D

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Section: Experimental Design and Forest Species Usedmentioning

confidence: 97%

The impact of deforestation and pasture abandonment on soil properties in the wet tropics of Australia

Rasiah¹,

Florentine²,

Williams³

et al. 2004

Geoderma

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“…high permanent charge), the Thorpe soil is allocated to Group 2 (low CEC, low AEC), while the remaining soils are all allocated to Group 3 (low CEC, high AEC). The latter soils belong to Ferrosol soil order (Isbell, 1994).…”

Section: Site Description Characteristics and Soil Coringmentioning

confidence: 99%

“…The soil profiles in this high rainfall area (3500 mm/years) are well structured and deep >1 to >10 m, and are characterised by high percolation rate (Cotching, 1995;Isbell, 1994;Bonell et al, 1983). Under these conditions, transport vs. in-situ nitrate and chloride adsorption and retention is not well understood.…”

Section: Introductionmentioning

confidence: 97%

Impact of pre-existing sulphate on retention of imported chloride and nitrate in variable charge soil profiles

Rasiah¹,

Armour²,

Menzies

et al. 2004

Geoderma

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“…Major proportions of the cultivated soils in the JRC belong to the Ferrosols soil order (Gillman and Abel, 1987;Isbell, 1994). These are red to brown, acidic, well-structured clay soils formed on basalt with deep profiles (Table I).…”

Section: Regolith Characteristicsmentioning

confidence: 98%

Statistical characterization of impact of system variables on temporal dynamics of groundwater in highly weathered regoliths

Rasiah¹,

Armour²,

Cogle³

2007

Hydrological Processes

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Abstract:In situations where the water table fluctuates during the rainy season the characterization of the impact of system variables on the temporal dynamics of the groundwater (GW) is essential to improve the understanding at catchment or regional scale behaviour of GW. In this study the appropriateness of the statistical parameters; mean, median, the 80 th percentile (PC80), coefficient of variation (CV), correlation coefficient (r), and multiple regression models were assessed to characterize the impact of system variables on the temporal dynamics of hydraulic head relative to ground surface (HH) during rainy seasons. The study was conducted from 1999 to 2003 in the wet tropical Johnstone River catchment (JRC) in north-east Queensland, Australia. Piezometer wells were installed at 32 sites under cropping to 5-90 m depth on different soil types, landscape positions, and varying proximity to surface water bodies (i.e. four system variables). The HH was measured, at least at 10-15 day intervals during 1-5 consecutive rainy seasons. The HH in the 32 wells fluctuated throughout each of the five rainy seasons. The mean HH averaged over the seasons ranged from 1Ð1 to 17Ð2 m across the wells, the median from 0Ð9 to 17Ð3 m, and the PC80 from 0Ð3 to 16Ð1 m. The temporal behaviour of HH characterization by mean of means of HH, the mean of medians of HH, and the mean of PC80 of HH, indicated the HH can be classified to belong to three different groups for each one of these parameters. The impact of the system variables on temporal dynamics, explored using multiple regression procedure, indicated that the model for median was marginally better than mean. The CV was found to be most appropriate parameter to characterize the impact of GW system variable (aquifer type), a component of the system variables, on temporal dynamics. The interactions of GW (i) belonging to different GW system and (ii) at shoulder with footslope in a landscape were best characterized by simple linear correlations.

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Krasnozems - a profile

Cited by 33 publications

References 0 publications

The impact of deforestation and pasture abandonment on soil properties in the wet tropics of Australia

The impact of deforestation and pasture abandonment on soil properties in the wet tropics of Australia

Impact of pre-existing sulphate on retention of imported chloride and nitrate in variable charge soil profiles

Statistical characterization of impact of system variables on temporal dynamics of groundwater in highly weathered regoliths

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