Tephra is an effective P diffusion barrier in root exclusion experiments

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• 作者：Qinhua Shen ; Mike Hedley ; Marta Camps Arbestain ; Miko U.F. Kirschbaum
• 关键词：Arbuscular mycorrhizal fungi ; Langmuir adsorption – isotherm ; Lotus pedunculatus cv barsille ; P diffusion ; Root study container ; Tephra
• 刊名：Plant and Soil
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：410
• 期：1-2
• 页码：51-61
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Plant Sciences; Soil Science & Conservation; Plant Physiology; Ecology;
• 出版者：Springer International Publishing
• ISSN：1573-5036
• 卷排序：410

文摘

Background and AimsTo understand the bioavailability of phosphorus (P) under different conditions, it is important to consider the P uptake by plant roots and arbuscular mycorrhizal fungi (AMF) hyphae separately. This can be done with root study containers that separate soil into root– and hyphal–zone by a layer of nylon <30 μm mesh, which impedes root access to parts of the soil while enabling exploration by AMF (termed the hyphal zone). However, diffusion of P from the hyphal zone to the root zone can complicate the analysis of such experiments when a concentration gradient is created by a P–rich patch in the hyphal zone. This study tested whether a layer of tephra with high P sorption characteristics can be arranged to prevent P diffusion between the root zone and the hyphal zone.