The significance to pastoral farming of a soil climosequence in Central Otago

Leamy, M. L.; Lüdecke, Tina; Blakemore, Laurel C.

doi:10.1080/03015521.1974.10427690

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…1b), resulting in a semi-arid continental climate 61 . Precipitation reaches lows of about 300-350 [mm year −1 ] on the valley floors, and highs of about 2250 [mm year −1 ] on the highest peaks (1450 masl) 62 . Most area is classified as a temperate oceanic climate after the Köppen-Geiger climate classification 63 .…”

Section: Methodsmentioning

confidence: 99%

Soil weathering dynamics and erosion in a dry oceanic area of the southern hemisphere (Otago, New Zealand)

Raab

Egli

Norton

et al. 2022

Sci Rep

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Landscape evolution is driven by tectonics, climate and surface denudation. In New Zealand, tectonics and steep climatic gradients cause a dynamic landscape with intense chemical weathering, rapid soil formation, and high soil losses. In this study, soil, and elemental redistribution along two adjacent hillslopes in East Otago, New Zealand, having different landscape settings (ridge versus valley) are compared to identify soil weathering and erosion dynamics. Fallout radionuclides (239+240Pu) show that over the last ~ 60 years, average soil erosion rates in the valley (~ 260 [t km−2 year−1]) are low compared to the ridge (~ 990 [t km−2 year−1]). The ridge yields up to 26% lower soil weathering intensity than the topographical-protected valley. The lowest soil weathering intensity is found at both hilltop positions, where tors (residual rocks) are present and partially disintegrate. The soil weathering intensity increases with distance from tors, suggesting that tors rejuvenate the chemical weathering signature at the hilltop positions with fresh material. The inversed and decreasing weathering degree with all soil depth indicates that the fresh mineral contribution must be higher at the soil surface than at the bedrock weathering front. Higher erosion rates at the exposed ridge may be partially attributed to wind, consistent with rock abrasion of tors, and low local river sediment yields (56 [t km−2 year−1]). Thus, the East Otago spatial patterns of soil chemistry and erosion are governed by tor degradation and topographic exposure.

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Section: Methodsmentioning

confidence: 99%

Soil weathering dynamics and erosion in a dry oceanic area of the southern hemisphere (Otago, New Zealand)

Raab

Egli

Norton

et al. 2022

Sci Rep

View full text Add to dashboard Cite

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“…The broad soil pattern is related to climate and topography (Figure 1). The broad climate, soil and vegetation relationships are summarised in Table 1 (Leamy et al 1974).…”

Section: Geography and Geologymentioning

confidence: 99%

Soil Resources of Central Otago

Brash¹,

Beecroft²

1987

ProNZG

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The broad soil pattern of Central Otago is outlined. Four soil zones are identified and their climate, vegetation and landscape characteristics given. The paper reviews causes of variation in soil properties at the detailed, farm scale. The highly variable soil pattern on many farms is caused by the wide variations in climate and topography which often occur within short distances in Central Otago. Farmers need to understand the soil pattern on their property to enable them to use soil resources efficiently, particularly with respect to fertiliser use and year-round integration of stock management between different soils of varying agricultural potential. The paper uses a local example to show how important soil chemical, morphological and physical properties can be measured and the resulting information used as the basis of achieving more efficient land use. Keywords: Soil pattern, agricultural production potential, brown-grey earth soils, yellow-grey earth soils, yellow-brown earth soils.

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“…There is an altitudinal and climatic sequence from Tima soils (YGE) at lower altitudes to Pinelheugh, Tawhiti and Teviot soils (YBE) above 600 m (Leamy & Wilde 1971). Mean annual rainfall ranged from 550 mm at 100 m altitude to 850 mm at 900 m.…”

Section: Study Areamentioning

confidence: 99%

Distribution survey of soil insects at Millers Flat, Central Otago

Barratt¹

1983

New Zealand Journal of Experimental Agriculture

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A soil-sampling survey carried out between 100-900 m altitude in the Millers Flat area of Central Otago investigated pasture type preferences and altitude range of the main pasture pests. Costelytra zealandica (White) was commonly found at high densities up to 600 m, particularly in cultivated pastures. Odontria striata White showed no pasture type preferences but was most common at 460-600 m altitude. Pyronota spp. were common in tussock grassland sites above 600 m, a habitat to which tipulid larvae and cicada nymphs were almost exclusively restricted. Wiseana spp. were most numerous at 300400 m, the zone in which most new pasture development by cultivation had taken place within the previous 5 years; undeveloped tussock sites supported lower numbers. Root-feeding weevil larvae were common, often at high densities.

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The significance to pastoral farming of a soil climosequence in Central Otago

Cited by 6 publications

References 11 publications

Soil weathering dynamics and erosion in a dry oceanic area of the southern hemisphere (Otago, New Zealand)

Soil weathering dynamics and erosion in a dry oceanic area of the southern hemisphere (Otago, New Zealand)

Soil Resources of Central Otago

Distribution survey of soil insects at Millers Flat, Central Otago

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