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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Soil production in heath and forest, Blue Mountains, Australia: influence of lithology and palaeoclimate
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Soil production in heath and forest, Blue Mountains, Australia: influence of lithology and palaeoclimate

机译：澳大利亚蓝山，荒地和森林中的土壤生产：岩性和古气候的影响

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摘要

Recent determinations of soil production from in situ cosmogenic nuclides indicate that production decreases exponentially with soil depth. This contrasts with a long-held assumption that maximum soil production occurs under a soil cover of finite depth. Sites in the Blue Mountains, Australia, show a sharp decrease of soil depth where vegetation changes from forested plateau surfaces to heath-covered spurs, and bands of bare rock in the heath suggest that soil production depends on presence of a finite depth of soil. The substrate varies from hard ferruginized sandstone to soft saprolite. In situ Be-10 determinations indicate that apparent rates of erosion and soil production are greater under the relatively thin heath soil than under the thicker forest soil but, in contrast to other studies, these sites do not show significant depth-dependence of apparent soil production. The pattern reflects both hardness variation in the rock substrate and the effect of Late Quaternary climatic change. Optically stimulated luminescence (OSL) dating indicates that soil <= 30 cm depth is of Holocene age whereas the deeper soil is substantially older. The age-break coincides with a stone line interpreted as a former surface lag deposit. Assuming that pre-Holocene soil depths were 30 cm less than today, recalculated soil production tends to decrease with increasing depth. Soil production at this site requires soil cover but bare rock patches and vegetation comprise a shifting mosaic. In the long term, average rates of erosion and soil production decrease with increasing soil depth. Copyright (c) 2005 John Wiley & Sons, Ltd.
机译：利用原位宇宙成因核素对土壤产量的最新测定表明，产量随土壤深度呈指数下降。这与长期以来的假设相反，即最大土壤产量在有限深度的土壤覆盖下发生。澳大利亚蓝山山脉的站点显示出土壤深度急剧下降，植被从森林高原表面变为荒地覆盖的马刺，荒地中裸露的岩石带表明土壤产量取决于土壤的有限深度。基材从硬质铁砂岩到软腐泥土不等。 Be-10的原位测定表明，在相对较薄的健康土壤下，表观的侵蚀和土壤生产速率要比在较厚的森林土壤下大，但是与其他研究相比，这些站点没有显示出明显的深度依赖于表观土壤产量。该模式既反映了岩石基质中的硬度变化，又反映了第四纪后期气候变化的影响。光学激发发光（OSL）测年表明，深度≤30 cm的土壤是全新世年龄，而较深的土壤则年龄较大。年龄突破与一条被解释为以前的表面滞后沉积物的石线重合。假设全新世以前的土壤深度比今天少30厘米，重新计算的土壤产量往往会随着深度的增加而减少。该地点的土壤生产需要土壤覆盖，但裸露的岩石斑块和植被构成了不断变化的马赛克。从长期来看，平均侵蚀速度和土壤产量随着土壤深度的增加而降低。版权所有（c）2005 John Wiley＆Sons，Ltd.

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