Plant induced weathering of minerals in the subsoil - release of 'non-exchangeable' potassium from 2:1 layer minerals (TransMinK)

植物引起的底土中矿物质的风化 - 从 2:1 层矿物质中释放“不可交换”钾 (TransMinK)

• 批准号: 170036456
• 负责人: Professor Dr. Reinhold Jahn
• 金额: --
• 依托单位: Professur für Bodenkunde und Bodenschutz
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/170036456?language=en
• 关键词: Plant; induced; weathering; minerals; subsoil

The proposal addresses the potential of subsoil to contribute to K nutrition of crops. More specifically we will address the processes controlling release of K from interlayer of 2:1 clay minerals as this is expected to be the dominant K fraction in the subsoil. While it has been shown in the past that this so called “non-exchangeable” K can be released due to root activity, there are controversial results concerning the role of soil solution K concentration in the rhizosphere required to trigger the process. Likewise little information is available about the concentration dynamics of other cations (NH4, Ca) in the rhizosphere and their impact on K release and vermiculitization supposed to be associated with this process. Model studies with substrate from the central field trial will be conducted in compartment systems equipped with micro suction cups. The measurement of dynamic changes of soil solution composition with increasing distance from the root surface will be combined with investigations of changes in mineralogy by XRD, TEM and SEM-EDX. Changes of mineralogy as a result of plant induced K release from interlayer will also be studied on bulk soil and rhizosphere samples collected within the central field and the central microcosm experiment and with mineral bags exposed in the field during a cropping cycle. Finally, X-ray CT will be used to access changes in soil texture, i.e. clay distribution around roots and the temporal spread of roots in biopores which is a prerequisite for K uptake from such structures.

该提案涉及底土对作物钾营养的贡献潜力。更具体地说，我们将解决的过程中控制释放的钾从夹层的2：1粘土矿物，因为这是预计将占主导地位的钾部分在底土。虽然它已被证明在过去，这种所谓的“非交换性”K可以释放由于根的活动，有争议的结果有关的作用，在根际土壤溶液K浓度所需的触发过程。同样，关于根际其他阳离子（NH 4，Ca）的浓度动态及其对钾释放和蛭石化的影响的信息也很少。将在配备微型吸盘的隔室系统中使用来自中心田间试验的底物进行模型研究。随着距离根表面的距离增加，土壤溶液成分的动态变化的测量将与通过XRD，TEM和SEM-EDX进行的矿物学变化的调查相结合。矿物学的变化，作为一个结果，植物诱导的钾释放从夹层也将研究散装土壤和根际样品收集在中央领域和中央微观实验，并与矿物袋暴露在该领域在一个种植周期。最后，X射线CT将被用来访问土壤质地的变化，即粘土分布在根和根的时间蔓延的生物孔隙，这是一个先决条件，从这样的结构吸收钾。

项目成果

Contribution of anecic earthworms to biopore formation during cultivation of perennial ley crops

• DOI: 10.1016/j.pedobi.2013.09.008
• 发表时间: 2014
• 期刊: Pedobiologia
• 影响因子: 2.3
• 作者: T. Kautz;Marcel Lüsebrink;S. Pätzold;D. Vetterlein;R. Pude;Miriam Athmann;Paul Martin Küpper;U. Perkons;U. Köpke

Illite transformation and potassium release upon changes in composition of the rhizophere soil solution

• DOI: 10.1007/s11104-013-1680-6
• 发表时间: 2013-10-01
• 期刊: PLANT AND SOIL
• 影响因子: 4.9
• 作者: Vetterlein, Doris;Kuehn, Thomas;Jahn, Reinhold
• 通讯作者: Jahn, Reinhold