梯度扩散薄膜技术(DGT)的理论及其在环境中的应用Ⅲ——植物有效性评价的理论基础与应用潜力

Theory and application of diffusive gradients in thin-films(DGT) in the environment Ⅲ:Theoretical basis and application potential in phytoavailability assessment

梯度扩散薄膜技术(DGT)是一种测定环境介质中多元素植物有效性的原位分析方法。由于其能模拟植物根系,综合考虑环境多介质的动态平衡,因此近年来被广泛应用于多元素植物有效性的评价。本文简要阐述了DGT技术基于动力学过程进行有效性测定的原理;深入剖析了DGT技术涉及的动力学过程与植物吸收机制的相似性与差异性;详细评估DGT技术预测多元素植物有效性的评价效果;并基于以上内容,对DGT技术在植物有效性方面的应用进行总结和展望。

Diffusive gradients in thin-films（DGT）is an in situ method assessing phytoavailability of metal（liod）s and phosphorus. A good correlation between concentrations of metal（liod）s and phosphorus in plants and their measurement by DGT in soils has been observed in plenty of studies, as DGT mimics the diffusion limiting uptake conditions that characterise the uptake of these solutes by many plants. In this paper, we elaborated what DGT measures in a particular environment based on an understanding of the dynamics processes. Mechanisms of metal（liod）s and phosphorus phytoavailability and how they relate to diffusive fluxes measured by DGT were discussed. Publications report-ing relationships between concentrations of elements in plants and soil measurements, including DGT, was summarized. In the end, an outlook on DGT application potential in predicting element phytoavailability was made.