Ruiz S, Koebernick N, Duncan S, Fletcher D McKay, Scotson C, Boghi A, Marin M, Bengough A G, George T S, Brown L K, Hallett P D, Roose T
1Bioengineering Science Research Group, Department of Mechanical Engineering, School of Engineering, Faculty of Engineering and Physical Science, University of Southampton, Southampton, SO17 1BJ UK.
5Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Universitaetplatz 10, 06108 Halle (Saale), Germany.
Plant Soil. 2020;447(1):281-304. doi: 10.1007/s11104-019-04308-2. Epub 2019 Dec 6.
Root hairs play a significant role in phosphorus (P) extraction at the pore scale. However, their importance at the field scale remains poorly understood.
This study uses a continuum model to explore the impact of root hairs on the large-scale uptake of P, comparing root hair influence under different agricultural scenarios. High vs low and constant vs decaying P concentrations down the soil profile are considered, along with early vs late precipitation scenarios.
Simulation results suggest root hairs accounted for 50% of total P uptake by plants. Furthermore, a delayed initiation time of precipitation potentially limits the P uptake rate by over 50% depending on the growth period. Despite the large differences in the uptake rate, changes in the soil P concentration in the domain due to root solute uptake remains marginal when considering a single growth season. However, over the duration of 6 years, simulation results showed that noticeable differences arise over time.
Root hairs are critical to P capture, with uptake efficiency potentially enhanced by coordinating irrigation with P application during earlier growth stages of crops.
根毛在孔隙尺度下的磷（P）提取中发挥着重要作用。然而，其在田间尺度下的重要性仍知之甚少。
本研究使用连续介质模型来探究根毛对磷大规模吸收的影响，比较不同农业情景下根毛的影响。考虑了土壤剖面中高磷与低磷、恒定磷浓度与衰减磷浓度，以及早期降水情景与晚期降水情景。
模拟结果表明，根毛占植物总磷吸收量的50%。此外，降水起始时间的延迟可能会使磷吸收速率根据生长阶段降低超过50%。尽管吸收速率差异很大，但在考虑单个生长季节时，由于根系溶质吸收导致的区域土壤磷浓度变化仍然很小。然而，在6年的时间里，模拟结果表明随着时间的推移会出现显著差异。
根毛对磷的捕获至关重要，在作物生长早期阶段将灌溉与施磷协调起来可能会提高吸收效率。
