How the composition of sandstone matrices affects rates of soil formation
How the composition of sandstone matrices affects rates of soil formation
复制标题
砂岩基质的成分如何影响土壤形成速率
DOI：
10.1016/j.geoderma.2021.115337
复制
发表时间：
2021
期刊：
影响因子：
6.1
通讯作者：
Evans D
中科院分区：
文献类型：
--
作者：
Evans D
土壤提供多种生态系统服务，它们的长期可持续性从根本上取决于它们形成和侵蚀的速度。我们对土壤形成的认识和理解与对土壤侵蚀的认识和理解不相称，部分原因是很难测量前者。然而，宇宙成因放射性核素累积模型的发展使土壤科学家能够更准确地限制土壤从基岩形成的速率。到目前为止，所有三种主要的岩石类型--火成岩、沉积岩性和变质岩性--都在这种工作中得到了检验。土壤形成速率已在这些岩石类型之间进行了测量和比较，但岩石特征对土壤形成速率的影响，如岩石基质和矿物学，很少被探索。在这项以英国为基础的研究中，我们使用宇宙成因放射性核素分析来调查砂岩的岩性变异性是否决定了土壤发生。在沃本和希尔顿的两个可耕种的山坡上测量了土壤形成速率，这两个山坡下覆盖着不同类型的砂岩。沃本的速度更快，我们认为这是因为沃本砂岩的胶结程度低于希尔顿。同样，沃本和希尔顿被发现的速率比英国另外两个砂岩遗址测得的要快，也比全球砂岩土壤宇宙学研究目录中汇编的要快。我们认为，以前研究的富含基质的岩屑中存在的胶结剂可能会使这些砂岩具有更大的结构完整性和抗风化能力。这项工作指出了将基岩基质纳入我们对土壤形成速率的理解中的重要性，以及这些基础上的生物地球化学循环。
Soils deliver multiple ecosystem services and their long-term sustainability is fundamentally controlled by the rates at which they form and erode. Our knowledge and understanding of soil formation is not commensurate with that of soil erosion, in part due to the difficulty of measuring the former. However, developments in cosmogenic radionuclide accumulation models have enabled soil scientists to more accurately constrain the rates at which soils form from bedrock. To date, all three major rock types – igneous, sedimentary and metamorphic lithologies – have been examined in such work. Soil formation rates have been measured and compared between these rock types, but the impact of rock characteristics on soil formation rates, such as rock matrices and mineralogy, have seldom been explored. In this UK-based study, we used cosmogenic radionuclide analysis to investigate whether the lithological variability of sandstone governs pedogenesis. Soil formation rates were measured on two arable hillslopes at Woburn and Hilton, which are underlain by different types of arenite sandstone. Rates were faster at Woburn, and we suggest that this is due to the fact that the Woburn sandstone formation is less cemented that that at Hilton. Similarly, rates at Woburn and Hilton were found to be faster than those measured at two other sandstone-based sites in the UK, and faster than those compiled in a global inventory of cosmogenic studies on sandstone-based soils. We suggest that the cementing agents present in matrix-abundant wackes studied previously may afford these sandstones greater structural integrity and resistance to weathering. This work points to the importance of factoring bedrock matrices into our understanding of soil formation rates, and the biogeochemical cycles these underpin.
登录
查看更多内容
影响因子：
4.6
作者：
Egli, Markus;Hunt, Allen G.;Yu, Fang
通讯作者：
Yu, Fang
英国贝德福德郡 Munday’s Hill 采石场下白垩纪（阿普第安-阿尔比安）的孢粉学和地质学
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
D. Stead;J. Eyers
通讯作者：
J. Eyers
爱尔兰海时代中部地区冰川作用
影响因子：
64.8
作者：
F. Shotton
通讯作者：
F. Shotton
DOI：
--
发表时间：
1979
期刊：
影响因子：
--
作者：
A. Reed
通讯作者：
A. Reed
英国兰开夏郡普雷斯顿三叠纪舍伍德砂岩群岩石的成岩作用：可能是次生孔隙的蒸发胶结物前体？
DOI：
--
发表时间：
1993
期刊：
Geological Society Special Publication
影响因子：
--
作者：
G. E. Strong
通讯作者：
G. E. Strong