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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Dust provenance and its role as a potential fertilizing agent for the Okavango Delta, Botswana
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Dust provenance and its role as a potential fertilizing agent for the Okavango Delta, Botswana

机译：灰尘来源及其作为Okavango Delta，Botswana的潜在施肥剂的作用

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Dust plays a globally important role in supplying biologically essential elements to landscapes underlain by nutrient-poor substrates. Here we show that dust may play a significant role in sustaining productivity in the vast wetlands of the Okavango Delta in southern Africa, one of the world's richest biodiversity hotspots. Dust accumulates preferentially on tree-covered islands in the seasonal swamps of the Delta, creating pockets of fine-grained, nutrient-rich material within the semi-arid landscape of the Kalahari Desert. Strontium and neodymium isotopes reveal that this dust likely originates predominantly from the Makgadikgadi salt pans, located 300 km away, and contributes 10-80% of the fine-grained material present in Okavango island soils. Surface material sourced from the Makgadikgadi Pans contains relatively high amounts of bioavailable phosphorus and iron, potentially influencing Okavango Delta biological productivity. We propose that long-term ecosystem productivity and nutrient availability in the Okavango may be strongly mediated by regional dust inputs. Understanding the influence of dust deposition on nutrient loads and biogeochemical cycling is thus critical for predicting the response of the Okavango Delta to future changes in climate. We suggest that dust inputs may play a significant role in the supply of nutrients to other large, global wetland systems located in dryland environments. (c) 2020 John Wiley & Sons, Ltd
机译：灰尘在通过营养不良的基材中向地区的景观中提供生物基本要素来发挥全球重要作用。在这里，我们展示灰尘可能在南部非洲南非奥卡万戈三角洲的广阔湿地中的生产力发挥重要作用，这是世界上最富有的生物多样性热点之一。尘埃在三角洲的季节性沼泽中优先积聚在树覆盖的岛上，在卡拉哈里沙漠的半干旱景观中创造了细粒度，营养丰富的材料的口袋。锶和钕同位素表明，这种粉尘主要来自Makgadikgadi Salt Pans，距离酒店有300公里的Makgadikgi Salt Pans，并贡献Okavango Island土壤中存在的10-80％的细粒材。来自Makgadikgadi PANS的表面材料含有相对大量的生物可利用磷和铁，可能影响Okavango Delta生物生产率。我们建议在Okavango中的长期生态系统生产力和营养可用性可能被区域粉尘输入强烈介导。了解粉尘沉积对营养载荷和生物地球化学循环的影响，因此对于预测Okavango Delta对未来气候变化的反应至关重要。我们建议粉尘输入可能在位于Dryland环境中的其他大型全球湿地系统的营养素供应中发挥重要作用。 （c）2020 John Wiley＆Sons，Ltd

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