DOI: 10.1007/s10533-016-0249-x
Scopus记录号: 2-s2.0-84990922544
论文题名: Parent material and pedogenic thresholds: observations and a simple model
作者: Vitousek P. ; Dixon J.L. ; Chadwick O.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 130, 期: 2018-01-02 起始页码: 147
结束页码: 157
语种: 英语
英文关键词: Hawaiian Islands
; Lithology
; Mineral weathering
; New Zealand
; Pedogenic thresholds
Scopus关键词: aluminum
; chemical weathering
; environmental gradient
; lithology
; numerical model
; parent material
; pedogenesis
; rainfall
; saturation
; soil type
; threshold
; Hawaii [United States]
; Hawaiian Islands
; New Zealand
; South Island
; United States
英文摘要: Pedogenic thresholds, where multiple soil properties vary substantially and coherently in a narrow portion of a broad environmental gradient, are well-described on basaltic soils in Hawaii. One such threshold occurs along climate gradients where primary minerals virtually disappear, base saturation decreases sharply, and aluminum is mobilized within a narrow range of increasing rainfall. A recent study that evaluated thresholds along a climate gradient of non-basalt-derived soils on the South Island of New Zealand found that while base saturation declined steeply in a narrow range of rainfall on that gradient, the change was not coherent across soil properties; a substantial fraction of the Ca present in primary minerals (40–60 %) remained through the highest-rainfall sites ((Dixon et al. in J Geophys Res, doi: 10.1002/2016JF003864, 2016). We developed a simple model to explore potential mechanisms driving differences between basalt-derived and non-basalt soils. Incorporating a broader spectrum of mineral weathering rates (including some primary minerals that are highly recalcitrant to weathering) into simulated non-basalt than simulated basalt-derived soils (and accounting for the lower rates of evapotranspiration in New Zealand) was sufficient to simulate observed differences between these substrates. Further, we used the simple model to evaluate the consequences of rainfall variation in the short- (time step to time step) and long-term (a change in rainfall after 50,000 time steps). Results of these analyses demonstrated that year-to-year variation in rainfall could play an important role in controlling changes in the position of the pedogenic threshold during soil development. © 2016, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83353
Appears in Collections: 气候减缓与适应 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Biology, Stanford University, Stanford, CA, United States; Department of Earth Sciences, Montana State University, Bozeman, MT, United States; Department of Geography, University of California, Santa Barbara, Santa Barbara, CA, United States
Recommended Citation:
Vitousek P.,Dixon J.L.,Chadwick O.A.. Parent material and pedogenic thresholds: observations and a simple model[J]. Biogeochemistry,2016-01-01,130(2018-01-02)