Effect of pasture improvement managements on physical properties and water content dynamics of a volcanic ash soil in southern Chile

作者: Iván Ordóñez , Ignacio F. López , Peter D. Kemp , Constanza A. Descalzi , Rainer Horn

DOI: 10.1016/J.STILL.2017.11.013

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摘要: Abstract The pastures in Chile are sustained on volcanic ash soils covering an area of 1,340,000 ha. Since 44% these degraded, different strategies to improve prairies have been implemented. This study examined the impact pasture improvement managements (PIMs) soil physical properties, water content dynamics and productivity a under sheep grazing. experiment was established Duric Hapludand considered four types PIMs (fertilised-naturalised pasture, cultivated direct-drilled diverse-direct drilled pasture) including initial situation (non-fertilised naturalised pasture). effect grazing events bulk density (BD), plant available (PAW), air permeability (k ), saturated hydraulic conductivity (Ks) pre-compression stress (Pc) topsoil (0–10 cm) determined taking undisturbed samples, whereas penetration resistance (PR), field l field) herbage mass production were measured field. volumetric content, matrix potential temperature continuously registered at depths. fertilisation degraded pastures, without structure disturbance, improved yield (140%), reaching values comparable those with conventional systems. In short term, volume macropores does not change significantly as function PIMs. However, tilled presented less connected pores compared non-cultivated conservation plays important role accessibility by plants, so that fertilised-naturalised able absorb depths up 60 cm. Compared non-fertilised lowest above ground biomass well negative effects properties (e.g. Pc increased 57% lower resilience) after events.

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