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Sulfur biogeochemical dynamics of grassland soils in northern China transect along an aridity gradient
Geoderma ( IF 5.6 ) Pub Date : 2024-10-20 , DOI: 10.1016/j.geoderma.2024.117073 Yi-Wen Cao, Xiao-Bo Wang, Chao Wang, Edith Bai, Nanping Wu
Geoderma ( IF 5.6 ) Pub Date : 2024-10-20 , DOI: 10.1016/j.geoderma.2024.117073 Yi-Wen Cao, Xiao-Bo Wang, Chao Wang, Edith Bai, Nanping Wu
As an essential nutrient element for biological growth and metabolism, sulfur is closely interlinked with the carbon and nitrogen cycles, and it is one of the limiting elements for grassland productivity. Here we investigated the spatial distribution of sulfur contents and 34 S stable isotope along the North China Transect (NCT), with the aim to explore the shaping role of the aridity index (AI) gradient on sulfur cycling dynamic in arid and semi-arid grasslands. In the area with AI < 0.12, soil sulfur contents and sulfur isotopic compositions (δ34 S) showed no correlation with AI, indicating that abiotic processes predominantly govern the sulfur cycle in this area. In the area where 0.12 ≤ AI < 0.32, both sulfur contents and δ34 S values increased with rising AI, with microbial-mediated reduction being the primary sulfur cycling process. In the area with 0.32 ≤ AI < 0.60, soil sulfur contents continued to increase with higher AI, but δ34 S significantly decreased as AI increased, suggesting plant uptake as the dominant sulfur cycling process in this area. This study demonstrated the significant impact of AI on sulfur dynamics, providing insights into the different drivers of sulfur cycling along the aridity gradient, and offering guidance for developing targeted strategies under global climate change.
更新日期：2024-10-20
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