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Coming Soon - Hydroponic Rootboxes To study root growth of inundated wetland plants and Waterlogged SOil

Hydroponic rootbox for flooding studies on roots and soil
Design example hydroponic rhizobox, (c) Busch et al. (2006), doi: 10.1016/j.flora.2005.08.007

Small rhizotrons have been occasionally used to study root growth of (wetland) plants (as related to soil properties) under waterlogged / flooded conditions (e.g. Busch et al. 2006, see Figure). However, hydroponic root boxes are not yet commercially available - hampering research on the "hidden half" of wetland and waterlogged ecosystems. Many studies thus use pots, which, however, allow e.g. measurements on root growth and spatial patterning of soil properties only at harvest time. Also large tanks holding several pots with plants have been used, but often at the cost of missing independent replicates. As of customer demand, particular for potential studies on rice root systems, Vienna Scientific is thus currently testing hydroponic rhizobox designs allowing to study roots and soil parameters under independently flooded conditions. We aim for developing a robust, cost-effective floodable rhizobox design which allows access to roots and soil via a removeable (transparent) front and/or back plate, the convenient adjustment of water levels by a (bottom) drainage system (with outlets at the side), and provides a savely sealed experimental system effectively preventing leakages. Stay tuned for details!

Water Logging Effects on Roots & Soil

The term waterlogging is used to refer to (super) saturation of the soil beyond field capacitiy. Beside in natural wetlands, water logging occurs when the infiltration of water from rainfall or flooding exceeds the rate of drainage and evapotranspiration. Diffusion of gases, notably of O2, is ∼10k-times slower in water than in air, leading to a rapid O2 depletion in waterlogged soils - as diffusion fails to keep pace with repiratory demand by roots and microbes. Oxygen deficiency in the rooting zone thus affects plant growth directly and rapidly by limiting aerobic respiration. Many species well adapted to waterlogging, such as rice, alder or Cyperaceae species, have aerenchyma formed in root tissues that allows the root-internal transport of oxygen. Others such as mangroves tap into oxygen above water levels by developing special organs. These adaptations can (at least partly) compensate for O2 shortages in the soil and support root aerobic respiration. A large body of work has thus focused on the development and functional role of aerenchymatous roots under waterlogged conditions. On the other hand, quantification of responses of "normal" (lateral) roots to waterlogging of "non-wetland" plants / crops has still been often overlooked. This is surprising, as extremes in water availability world-wide (both wet and dry) will increase under future climate conditions, and many management measures (e.g. heavy machinery used for harvests) facilitate soil compaction - compaction rendering soils more prone to waterlogging by reducing pore spaces. In addition to direct effects by O2 depletion, many other soil biochemical processes are affected by waterlogging, resulting i.a. in large alterations in nutrient availabilities. It seems thus key, that root and soil processes under temporal waterlogging recieve greater attention by researchers world-wide. Vienna Scientific aims to contribute the technical means - by developing effective hydroponic rhizobox systems - enabeling the easier set-up of research programs on the topic. 

Selected studies on Roots and Rhizosphere under Flooded conditions

  • Busch, J., Mendelssohn, I. A., Lorenzen, B., Brix, H., & Miao, S. (2006). A rhizotron to study root growth under flooded conditions tested with two wetland Cyperaceae. Flora-Morphology, Distribution, Functional Ecology of Plants, 201(6), 429-439.
  • He, S., Wang, X., Wu, X., Yin, Y., & Ma, L. Q. (2020). Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils. Environment International, 141, 105799.
  • Hussner, A. (2010). Growth response and root system development of the invasive Ludwigia grandiflora and Ludwigia peploides to nutrient availability and water level. Fundamental and Applied Limnology, 177(3), 189-196.
  • Hussner, A., Meyer, C., & Busch, J. (2009). The influence of water level and nutrient availability on growth and root system development of Myriophyllum aquaticum. Weed Research, 49(1), 73-80.
  • Lorenzen, B., Brix, H., Mendelssohn, I. A., McKee, K. L., & Miao, S. L. (2001). Growth, biomass allocation and nutrient use efficiency in Cladium jamaicense and Typha domingensis as affected by phosphorus and oxygen availability. Aquatic botany, 70(2), 117-133.
  • Miao, S. L., & Zou, C. B. (2012). Effects of inundation on growth and nutrient allocation of six major macrophytes in the Florida Everglades. Ecological Engineering, 42, 10-18.
  • Pezeshki, S. R., Pardue, J. H., & DeLaune, R. D. (1996). Leaf gas exchange and growth of flood-tolerant and flood-sensitive tree species under low soil redox conditions. Tree Physiology, 16(4), 453-458.
  • Pierce, S. C., Koontz, M. B., Pezeshki, S. R., & Kröger, R. (2013). Response of Salix nigra [Marsh.] cuttings to horizontal asymmetry in soil saturation. Environmental and experimental botany, 87, 137-147.
  • Schreiber, C. (2011). Rhizosphere dynamics of higher plants in the water fluctuation zone of Yangtze River: root exudates and mass flow (Doctoral dissertation, Düsseldorf, Heinrich-Heine-Universität, Diss., 2011)
  • Zhao, M., Liu, J., Zhang, C., Liang, X., E, Q., Liu, R., ... & Liu, X. (2021). Development and Applications of an In Situ Probe for Multi-Element High-Resolution Measurement at Soil/Sediment-Water Interface and Rice Rhizosphere. Agronomy, 11(12), 2383.
  • Zhou, N., Hu, W., Deng, J., Zhu, J., Xu, W., & Liu, X. (2017). The effects of water depth on the growth and reproduction of Potamogeton crispus in an in situ experiment. Journal of Plant Ecology, 10(3), 546-558.
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