Modifying soil properties with herbaceous plants for natural flood risk-reduction
Modifying soil properties with herbaceous plants for natural flood risk-reduction
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DOI：
10.1016/j.ecoleng.2022.106668
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发表时间：
2022-07
影响因子：
3.8
通讯作者：
D. Boldrin;J. Knappett;A. K. Leung;J. Brown;K. Loades;A. Bengough
中科院分区：
文献类型：
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作者：
D. Boldrin;J. Knappett;A. K. Leung;J. Brown;K. Loades;A. Bengough
背景和目的以自然为基础的工程挑战解决方案对于限制气候变化对城市环境的影响至关重要。在物种选择和重建受城市化影响的自然过程中，需要对不同物种的土壤-植物相互作用所提供的多种“工程功能”进行定量的了解。方法选择具有对比性的草本植物(豆科、牧草和杂草)，在土柱中以单一栽培或物种混合的方式种植，为期5个月。对每个柱子的饱和渗透系数进行了初步测试，然后对这些柱子进行了为期三周的蒸散量监测。测量了失水率、基质吸力和渗透阻力。结果植被覆盖土壤的饱和导水率普遍大于休耕土壤(6.9E−6±1.4E−6m/S)。不同树种间饱和导水率差异显著(羊茅为9.9E−6±1.3E−6M/S，莲花为3.9E−5±1.2E−6M/S)，并与比根长呈显著负相关。储存在土壤中的水分通过植物蒸腾作用(蒸散量的60%)被有效地去除。在植被覆盖的土壤中观察到土壤结构发生了很大的变化，土壤强度、团聚体稳定性和水分保持特性发生了显著的变化。结论土壤-植物的多重相互作用影响着物种选择，以优化基于自然的解决方案(例如，生物保持屏障)。有很大的范围来选择物种混合物来操纵土壤的水力学性质。增强的生物多样性不会损害基于自然的解决方案的工程服务(例如，除水)，而且可能有多种好处。
Background and aimNature-based solutions to engineering challenges are essential to limit climate change impacts on the urban environment. Quantitative understanding of multiple “engineering functions” provided by soil-plant interactions of different species is needed for species selection and re-establishing natural processes affected by urbanisation.MethodsContrasting herbaceous species (legumes, grasses, and forbs) were selected and grown as monoculture or species mix in soil columns for a five-month growing season. Saturated hydraulic conductivity was initially tested for each column, and then the columns were monitored for three-weeks of evapotranspiration. Water loss, matric suction, and penetrometer resistance were measured. Finally, soil was tested for aggregate stability and water retention.ResultsSaturated hydraulic conductivity of vegetated soil was generally larger than that of fallow soil (6.9e−6± 1.4e−6m/s in fallow soil). Saturated hydraulic conductivity was significantly different between species (e.g., from 9.9e−6± 1.3e−6m/s inFestuca ovinato 3.9e−5± 1.2e−6m/s inLotus corniculatus) and was negatively correlated with specific root length. The water stored in the soil was efficiently removed by plant transpiration (> 60% of evapotranspiration). Large changes in soil structure were observed in vegetated soil, with significant increases in soil strength, aggregate stability, and alteration of water retention properties.ConclusionsMultiple soil-plant interactions influence species selection for optimising nature-based solutions (e.g., bioretention barriers). Substantial scope exists to choose species mixes to manipulate soil hydro-mechanical properties. Enhanced biodiversity did not compromise the engineering services of nature-based solutions (e.g., water removal), and may have multiple benefits.