Carbonate dissolution cones require more than stemflow funneling from plants
Carbonate dissolution cones require more than stemflow funneling from plants
复制标题
碳酸盐溶解锥需要的不仅仅是来自植物的茎流漏斗
DOI：
10.1016/j.geomorph.2022.108215
复制
发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Sasse, Riley K.
中科院分区：
文献类型：
--
作者：
Van Stan, John T.;Swanson, Travis E.;Sasse, Riley K.
在地质时间尺度上，森林拦截了降水，从而改变了森林土壤水通量的强度、持续时间和空间格局。在各种环境条件下，持续聚焦的水流可以溶解碳酸盐底物，并形成圆锥形溶解特征——称为“溶解锥”。这些锥体通常充满土壤，成为植被占据的局部土壤（和水）库。假设有多种机制形成溶解锥。先前的工作试图解释热带松散碳酸盐中棕榈树和现代溶解锥的共同定位，这是弱酸性茎流通过棕榈树冠向下输送并进入基质的化学作用的结果。使用地球化学建模程序 PHREEQC，我们发现，在一系列环境条件和有利的假设下，茎流无法溶解代表热带溶解锥的碳酸盐基质的基准体积。因此，茎流漏斗的非生物溶解作用形成的溶解锥不太可能是主要的地貌过程。讨论了需要测试的进一步假设。
Over geologic timescales, forests have intercepted precipitation and thereby modified the intensity, duration, and spatial patterns of water fluxes to forest soils. Across a range of environmental conditions, persistent focused water flows can dissolve carbonate substrates, and form conical dissolution features—termed “dissolution cones.” These cones generally fill with soils, becoming localized soil (and water) reservoirs occupied by vegetation. A myriad of mechanisms are hypothesized to have formed dissolution cones. Prior work has sought to explain co-located palm trees and modern dissolution cones in tropical unconsolidated carbonates as the result of the chemical action of weakly acidic stemflow funneled by palm canopies down their stems, and into the substrate. Using a geochemical modeling program, PHREEQC, we find that for a range of environmental conditions and favorable assumptions, stemflow is unable to dissolve a benchmark volume of carbonate substrate that typifies tropical dissolution cones. Therefore, dissolution cone formation by abiotic dissolution from stemflow funneling is unlikely to be the chief geomorphic process. Further hypotheses to be tested are discussed.