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• W3166038205 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Heterotrophic soil respiration is an important component of the global terrestrial carbon (<span class=inline-formula>C</span>) cycle, driven by environmental factors acting from local to continental scales. For tropical Africa, these factors and their interactions remain largely unknown. Here, using samples collected along topographic and geochemical gradients in the East African Rift Valley, we study how soil chemistry and fertility drive soil respiration of soils developed from different parent materials even after many millennia of weathering. To address the drivers of soil respiration, we incubated soils from three regions with contrasting geochemistry (mafic, felsic and mixed sediment) sampled along slope gradients. For three soil depths, we measured the potential maximum heterotrophic respiration under stable environmental conditions and the radiocarbon content (<span class=inline-formula>Δ</span><span class=inline-formula>¹⁴C</span>) of the bulk soil and respired <span class=inline-formula>CO₂</span>. Our study shows that soil fertility conditions are the main determinant of <span class=inline-formula>C</span> stability in tropical forest soils. We found that soil microorganisms were able to mineralize soil <span class=inline-formula>C</span> from a variety of sources and with variable <span class=inline-formula>C</span> quality under laboratory conditions representative of tropical topsoil. However, in the presence of organic carbon sources of poor quality or the presence of strong mineral-related <span class=inline-formula>C</span> stabilization, microorganisms tend to discriminate against these energy sources in favour of more accessible forms of soil organic matter, resulting in a slower rate of <span class=inline-formula>C</span> cycling. Furthermore, despite similarities in climate and vegetation, soil respiration showed distinct patterns with soil depth and parent material geochemistry. The topographic origin of our samples was not a main determinant of the observed respiration rates and <span class=inline-formula>Δ</span><span class=inline-formula>¹⁴C</span>. In situ, however, soil hydrological conditions likely influence soil <span class=inline-formula>C</span> stability by inhibiting decomposition in valley subsoils. Our results demonstrate that, even in deeply weathered tropical soils, parent material has a long-lasting effect on soil chemistry that can influence and control microbial activity, the size of subsoil <span class=inline-formula>C</span> stocks and the turnover of <span class=inline-formula>C</span> in soil. Soil parent material and its control on soil chemistry need to be taken into account to understand and predict <span class=inline-formula>C</span> stabilization and rates of <span class=inline-formula>C</span> cycling in tropical forest soils." @default.
• W3166038205 created "2021-06-22" @default.
• W3166038205 creator A5063433361 @default.
• W3166038205 date "2021-06-03" @default.
• W3166038205 modified "2023-10-14" @default.
• W3166038205 title "Reply on CC1" @default.
• W3166038205 doi "https://doi.org/10.5194/soil-2020-96-ac1" @default.
• W3166038205 hasPublicationYear "2021" @default.
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