Development and Applications of an In Situ Probe for Multi-Element High-Resolution Measurement at Soil/Sediment-Water Interface and Rice Rhizosphere

文献类型： 外文期刊

第一作者： Zhao, Meng

作者： Zhao, Meng;Liu, Jiang;Zhang, Chuangchuang;Qian, E.;Zhao, Yujie;Liu, Xiaowei;Zhao, Meng;Liu, Jiang;Zhang, Chuangchuang;Liang, Xuefeng;Qian, E.;Liu, Rongle;Zhao, Yujie;Liu, Xiaowei;Zhao, Meng

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关键词： in situ sampling; nutrients; metal(loid)s; crop rhizosphere; sustainable agriculture

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

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年卷期： 2021 年 11 卷 12 期

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收录情况： SCI

摘要： The biogeochemistry of multi-elements, such as sulfur (S), phosphorus (P) and arsenic (As), is interlinked especially at interfaces of soil/sediment-water and plant rhizosphere. To explore the biogeochemical behavior of multi-elements such as S-P-As at interfaces, an in situ and high-resolution technology is required. In this study, we developed an in situ probe (LDHs-DGT) based on the diffusive gradients in thin-films technique using a single binding layer to realize the co-measurement of multi-elements including sulfide and oxyanions. Mg-Al layered double hydroxides (LDHs) were synthesized and incorporated into the probe's binding layer. Laboratorial characterization showed that the LDHs-DGT probe had a high capacity for sulfide, phosphate and arsenate and can effectively determine their levels across a wide range of solution conditions, i.e., pH from 5 to 8 and ionic strengths from 0.005-0.01 mol L-1 NaNO3. The application potential of the LDHs-DGT probe in capturing the concentration profiles of sulfide and oxyanions across the soil/sediment-water interface at a centimeter scale was demonstrated. The synchronous co-variations of labile sulfide and phosphate were observed along an intact river sediment core, demonstrating the redox driven behaviors of oxyanions at aerobic-anaerobic transition zones. Moreover, the LDHs-DGT probe was further used to acquire the dynamic distributions of multi-elements in the plant rhizosphere at a two-dimensional millimeter scale. Compared to treatments of sodium sulfate and mercaptopygorskite fertilization, the addition of elementary S promoted the reduction of sulfate to sulfide along the whole growth stage and thus inhibited the activation of toxic metals in the rice rhizosphere. Collectively, this study provides a tool for convenient measurement of nutrients and metal(loid)s across soil-water/root interfaces at high resolution and thus, a broad application prospect of the tool in sustainable agriculture is expected.

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