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Long-chain 1,3-diols in a land-estuary-sea continuum: Tracers for soil organic matter
Chemical Geology ( IF 3.6 ) Pub Date : 2024-09-14 , DOI: 10.1016/j.chemgeo.2024.122411 Xiaowei Zhu, Guodong Jia, Shengyi Mao, Wei Guo, Gang Li, Wen Yan
Chemical Geology ( IF 3.6 ) Pub Date : 2024-09-14 , DOI: 10.1016/j.chemgeo.2024.122411 Xiaowei Zhu, Guodong Jia, Shengyi Mao, Wei Guo, Gang Li, Wen Yan
The fate of terrestrial organic matter (OM) in land-sea transition is critical to earth surface carbon cycling, which needs to be tracked with proper proxies. Existing proxies are mostly derived from terrestrial higher plants, whereas proxies from soil bacteria, another critical soil OM producers, are scarce. Here, we investigate the potential of a suite of C22–28 even carbon-numbered 1,3-diols as a soil bacterial tracer, and hence as soil OM proxy, using a range of biological (plants and litters) and natural (soils, suspended particulate matters (SPMs) and sediments) materials in a land-estuary-sea continuum in tropical South China. The 1,3-diols are ubiquitous in soils, SPMs and sediments but not detected in living plants and leaf litters, thus ruling out plant origin of these diols. In a soil profile, C22–26 1,3-diols are abundant in the upper high‑oxygen layers but lacking in the deeper low-oxygen layers, implying their aerobic bacterial origin. By contrast, C28 1,3-diol appears only in low-oxygen layers, perhaps due mainly to its anaerobic bacterial origin. In the estuary, the spatiotemporal distribution patterns of 1,3-diols take the characteristics of their terrigenous origin, exhibiting higher abundances in wet season-collected SPMs and overall decreasing contents with increasing salinities. The estuarine SPMs and surface sediments show higher %C28 1,3-diol than surface sediments on the coastal shelf, implying that the former receive more OM contribution from the deep soils. This phenomenon is explained to reflect a stronger soil erosion into the deep in the pre-sampling year as recorded by estuarine materials, and a multi-year mean, weaker erosion as recorded by coastal surface sediments. Our study demonstrates that 1,3-diols are applicable as a tracer for soil OM input from land biosphere to marine realm in tropical South China, but their suitability in broad other settings should be assessed especially in those that may encounter with plant-derived 1,3-diols.
更新日期：2024-09-14
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