Does soil erosion rejuvenate the soil phosphorus inventory?
Does soil erosion rejuvenate the soil phosphorus inventory?
复制标题
土壤侵蚀是否会恢复土壤磷库存？
DOI：
10.1016/j.geoderma.2018.06.021
复制
发表时间：
2018
期刊：
影响因子：
6.1
通讯作者：
S. Mudd
中科院分区：
文献类型：
--
作者：
A. Eger;K. Yoo;P. Almond;G. Boitt;I. Larsen;L. Condron;Xiang Wang;S. Mudd
磷（P）是生命必需的营养素。土壤缺磷会降低初级生产力，改变生物多样性。一个土壤磷范例的基础上形成的平坦地形，侵蚀速率最小的土壤研究表明，P主要是提供给土壤作为磷灰石从底层的母质，随着时间的推移，通过风化或转化为不稳定和生物利用度较低的次生形式。然而，很少有人系统地了解侵蚀山坡上的磷转化和生物有效性，这构成了地球表面的大部分。通过将土壤停留时间与土壤和母质中的P组分联系起来，我们表明，传统的P转化概念作为时间的函数对南阿尔卑斯山西部（新西兰）和内华达州山脉北方（美国）的山坡土壤的适用性有限。相反，在这些网站的侵蚀土壤中的磷库存占主导地位的次生磷形式在一系列的土壤停留时间，观察与以前发表的土壤磷数据一致。山坡土壤的研究结果与年代序列研究中使用的侵蚀最小土壤的研究结果形成对比，土壤P范例起源于年代序列，因为年代序列通常位于地貌上，其中母质化学变化较少，因此与山坡上的土壤相比，磷灰石P更丰富，山坡上的土壤通常被预风化的母质（例如，腐泥土）。地貌历史的土壤母质是可能的原因土壤磷库存差异侵蚀山坡土壤与地貌稳定的时序土壤。此外，植物和灰尘似乎发挥了重要的作用，在垂直再分配P在山坡土壤。鉴于次生土壤磷在山坡土壤中的主导地位，限制生态系统的发展所造成的生物有效磷供应不足，可能是更相关的山坡比以前认为的。
Phosphorus (P) is an essential nutrient for life. Deficits in soil P reduce primary production and alter biodiversity. A soil P paradigm based on studies of soils that form on flat topography, where erosion rates are minimal, indicates P is supplied to soil mainly as apatite from the underlying parent material and over time is lost via weathering or transformed into labile and less-bioavailable secondary forms. However, little is systematically known about P transformation and bioavailability on eroding hillslopes, which make up the majority of Earth's surface. By linking soil residence time to P fractions in soils and parent material, we show that the traditional concept of P transformation as a function of time has limited applicability to hillslope soils of the western Southern Alps (New Zealand) and Northern Sierra Nevada (USA). Instead, the P inventory of eroding soils at these sites is dominated by secondary P forms across a range of soil residence times, an observation consistent with previously published soil P data. The findings for hillslope soils contrast with those from minimally eroding soils used in chronosequence studies, where the soil P paradigm originated, because chronosequences are often located on landforms where parent materials are less chemically altered and therefore richer in apatite P compared to soils on hillslopes, which are generally underlain by pre-weathered parent material (e.g., saprolite). The geomorphic history of the soil parent material is the likely cause of soil P inventory differences for eroding hillslope soils versus geomorphically stable chronosequence soils. Additionally, plants and dust seem to play an important role in vertically redistributing P in hillslope soils. Given the dominance of secondary soil P in hillslope soils, limits to ecosystem development caused by an undersupply of bio-available P may be more relevant to hillslopes than previously thought.
加利福尼亚州内华达山脉沿侵蚀梯度的土壤碳和矿物表面积的储存和输出
影响因子：
6.1
作者：
Wang X
通讯作者：
Wang X
影响因子：
3.9
作者：
Hurst, Martin D.;Mudd, Simon M.;Yoo, Kyungsoo
通讯作者：
Yoo, Kyungsoo
影响因子：
56.9
作者：
Larsen, Isaac J.;Almond, Peter C.;Malcolm, Brendon
通讯作者：
Malcolm, Brendon