Interactions among hydro-aeolian processes and micro-geomorphology stimulate hot spots of sediment carbon source and sink within a coppice dune system

IF 1.1 4区地球科学 Q4 ENVIRONMENTAL SCIENCES

Physical Geography Pub Date : 2021-03-31 DOI:10.1080/02723646.2021.1905594

N. Mohseni, S. Hosseinzadeh

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引用次数: 2

Abstract

ABSTRACT We evaluated the impacts of the interactions among hydro-aeolian processes and micro-geomorphology on mechanisms controlling the sediment carbon source and sink within a coppice dune. The sediment sampling process was performed within different positions of each dune. Sediment grain size distribution, geometric mean diameter, mean weight diameter, labile SOC, CO2 flux, and C mineralization ratio were measured. The finest sediments were observed on the dune edge. The labile SOC and CO2 flux rate showed an increasing trend in the edge, windward, and top positions. However, the C mineralization ratio decreased only in the dune edge. A significant increase of clay fractions at the dune edge can result from the horizontal sediment transport by runoff from the interdune area to the dune. The SOC could bond with clay fractions to contribute toward the formation of soil aggregation, causing less vulnerability of SOC to microbial respiration. A significant increase of sand fractions, transported by the aeolian process, on the top and windward positions could not protect SOC against decomposition. The interactions among hydro-aeolian processes and micro-geomorphology could encourage the hot spots of sediment carbon reservoirs within the dryland landforms that have a significant proportion in the exchange of carbon to the atmosphere.

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水文风成过程与微地貌的相互作用刺激了森林沙丘系统中沉积物碳源和碳汇的热点

摘要我们评估了水风成过程和微观地貌之间的相互作用对控制矮林沙丘沉积物碳源和汇机制的影响。沉积物取样过程在每个沙丘的不同位置进行。测量了沉积物粒度分布、几何平均直径、平均重量直径、不稳定SOC、CO2通量和C矿化率。在沙丘边缘发现了最细的沉积物。不稳定SOC和CO2通量率在边缘、向风和顶部位置呈增加趋势。然而，C矿化率仅在沙丘边缘降低。沙丘边缘粘土组分的显著增加可能是由于径流从沙丘间区域向沙丘的水平输沙造成的。SOC可以与粘土组分结合，有助于形成土壤团聚体，降低SOC对微生物呼吸的脆弱性。在顶部和向风位置，风成过程输送的沙子分数的显著增加不能保护SOC不分解。水文-风成过程和微观地貌之间的相互作用可能会促进旱地地貌中沉积物碳库的热点，这些沉积物碳库在向大气的碳交换中占很大比例。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Geography 地学-地球科学综合

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Physical Geography disseminates significant research in the environmental sciences, including research that integrates environmental processes and human activities. It publishes original papers devoted to research in climatology, geomorphology, hydrology, biogeography, soil science, human-environment interactions, and research methods in physical geography, and welcomes original contributions on topics at the intersection of two or more of these categories.