Department of Earth Sciences, Guilin University of Technology, Guilin, 541004, China.
Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources by the Province and Ministry, Guilin University of Technology, Guilin, 541004, Guangxi, China.
Environ Geochem Health. 2024 Sep 30;46(11):458. doi: 10.1007/s10653-024-02238-2.
The dynamics of phosphorus are intricately governed by geological and ecological processes. Examining phosphorus dynamics in volcanic islands can enhance our comprehension of its behavior within such unique geological systems. However, research on phosphorus dynamics in volcanic islands remains limited. We investigated the phosphorus content of volcaniclastic rocks and basalt soils from Weizhou Island, China, to understand the influencing factors on phosphorus dynamics. The results indicate that in the volcaniclastic profile, phosphorus concentrates at 20-40 cm (17 mg/kg), decreases at 40-60 cm (11.9 mg/kg), and increases at 80-200 cm up to 46.4 mg/kg proximate to the bedrock, for the basalt profile, phosphorus content increases from the surface (80.2 mg/kg) towards the bedrock (83.9 mg/kg). The differences in phosphorus distribution between volcaniclastic rocks and basalts reflect the influence of parent material, rock weathering degree, carbonate content, topographic elevation, sea level changes, and geological activities. A strong positive correlation (R = 0.96907) between total and available phosphorus has been observed, suggesting that total phosphorus content effectively predicts available phosphorus content. Volcaniclastic rocks in wharves and high-elevation areas show low total phosphorus, while forest land with dense vegetation and neutral to alkaline soil supports higher total phosphorus due to enhanced bioavailability for plant absorption and utilization. Overall, the basalt soil of the volcanic island Weizhou Island demonstrates superior long-term fertility compared to the volcaniclastic soil. Despite its low total phosphorus content, it mainly exists in a highly bioavailable form, facilitating plant absorption, which is crucial for enhancing agricultural yields and ecosystem restoration on volcanic islands.
磷的动态变化受到地质和生态过程的复杂控制。研究火山岛中的磷动态变化可以增强我们对其在这种独特地质系统中行为的理解。然而，关于火山岛中的磷动态变化的研究仍然有限。我们研究了中国涠洲岛火山碎屑岩和玄武岩土壤中的磷含量，以了解影响磷动态变化的因素。结果表明，在火山碎屑剖面中，磷集中在 20-40cm（17mg/kg）处，在 40-60cm 处减少（11.9mg/kg），在 80-200cm 处靠近基岩处增加至 46.4mg/kg，对于玄武岩剖面，磷含量从表面（80.2mg/kg）向基岩（83.9mg/kg）增加。火山碎屑岩和玄武岩之间磷分布的差异反映了母质、岩石风化程度、碳酸盐含量、地形高度、海平面变化和地质活动的影响。总磷和有效磷之间存在很强的正相关关系（R=0.96907），表明总磷含量可以有效地预测有效磷含量。码头和高海拔地区的火山碎屑岩总磷含量较低，而植被茂密、土壤呈中性至碱性的林地由于植物吸收和利用的生物有效性增强，总磷含量较高。总的来说，火山岛涠洲岛的玄武岩土壤具有比火山碎屑土壤更好的长期肥力。尽管其总磷含量低，但主要以高生物有效性的形式存在，有利于植物吸收，这对于提高火山岛的农业产量和生态系统恢复至关重要。
