Effects of roots systems on hydrological connectivity below the soil surface in the Yellow River Delta wetland

Zhang, Yinghu; Jiang, Jiang; Zhang, Jinchi; Zhang, Zhenming; Zhang, Mingxiang

doi:10.1002/eco.2393

Cited by 10 publications

(8 citation statements)

References 54 publications

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“…The DC is defined as the ratio of the dye-stained area to the total area of the vertical profile [19].…”

Section: Field Dye-tracing Experimentsmentioning

confidence: 99%

“…The fractal dimension (FD) of the dye image reflects the complexity of the wetting front of the soil water movement [34]. Even when the stained regions are The DC is defined as the ratio of the dye-stained area to the total area of the vertical profile [19].…”

Section: Ihc Characterizationmentioning

confidence: 99%

“…Dai et al [16] evaluated the function of wetland water resources using the dye tracing technique. Several scholars have evaluated the hydrological connectivity in certain types of ecosystems by building models or using parameters, such as a one-way linked subsurface-surface model [17], the network index [18], and the index of hydrological connectivity [19]. Hydrological connectivity has been studied for decades, and some methods, such as soil water content and topography, are developed to evaluate the hydrological connectivity.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Root System Architecture of Pinus taeda and Phyllostachys edulis on the Index of Hydrological Connectivity in Subtropical Forest Ecosystems

Zhang

Wang

Tang

et al. 2022

Forests

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The hydrological connectivity below the soil surface can influence the forest structure and function, especially soil and plant productivity. However, few studies have determined the changes in the hydrological connectivity below the soil surface with increasing soil depth and have quantified the effects of root systems on the hydrological connectivity in forest ecosystems. In this study, we evaluated the index of the hydrological connectivity (IHC) below the soil surface using a field dye tracing method and compared the difference in the index of hydrological connectivity in two subtropical forest stands (i.e., pine trees [SS] and bamboo [ZL]). We analyzed the interactions between the parameters of root system architecture and the index of hydrological connectivity. Back propagation (BP) neural networks were used to quantify which parameter can contribute the most relative importance to the changes of the IHC. The results revealed that the maximum value of the index of hydrological connectivity occurs at the soil surface, and it exhibits a non-linear decreasing trend with increasing soil depth. The parameters of root system architecture (root length, root projected area, root surface area, root volume, and root biomass) were rich in the top soil layers (0–20 cm) in the two sites. Those parameters were positively correlated with the IHC and the root length had the largest positive influence on the hydrological connectivity. Furthermore, we found that root system architecture with different root diameters had different degrees of influence on the index of hydrological connectivity. The very fine root systems (0 < D < 1 mm) had the greatest effect on the hydrological connectivity (p < 0.01). The results of this study provide more information for the assessment of the hydrological connectivity below the soil surface and a better understanding of the effects of root systems in soil hydrology within the rhizosphere.

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“…The DC is defined as the ratio of the dye-stained area to the total area of the vertical profile [19].…”

Section: Field Dye-tracing Experimentsmentioning

confidence: 99%

Section: Ihc Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the Root System Architecture of Pinus taeda and Phyllostachys edulis on the Index of Hydrological Connectivity in Subtropical Forest Ecosystems

Zhang

Wang

Tang

et al. 2022

Forests

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“…Surface soil is also rich in root systems (Table 1) (Zhang et al, 2017; Zhang, Niu, Yu, et al, 2015; Zhang, Niu, Zhu, et al, 2015). Previous studies indicated that pores between root systems and the surrounding soils can interconnect with decayed root channels (Zhang et al, 2018; Zhang et al, 2022). The interconnected pores networks can promote solute transport.…”

Section: Discussionmentioning

confidence: 99%

“…Soil column dye staining patterns at soil depths at the tree site (a) and the bush site (b) . Previous studies indicated that pores between root systems and the surrounding soils can interconnect with decayed root channels (Zhang et al, 2018;Zhang et al, 2022). The interconnected pores networks can promote solute transport.…”

Section: Steady Infiltration and Effluents Concentration Changesmentioning

confidence: 99%

Dye solution experiments for determining solute transport behaviour in degraded wetland soils of the Yellow River Delta

et al. 2022

Self Cite

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Solute transport behaviour can indicate the efficiency of eco-hydrological responses.However, this behaviour has not been consider for use in assessing the health of wetland ecosystems. We assessed solute transport behaviour in degraded wetland soils using 72 undisturbed soil columns located in Robinia pseudoacacia (tree) and Tamarix chinensis (bush) communities. Soil column tracer experiments were conducted under the same initial and boundary conditions using Brilliant Blue FCF as a conservative tracer. Solute transport behaviour at a soil column scale was described by four measures: steady infiltration rate of effluents, concentration of effluents, dye staining patterns and cumulative effluents leaching. Numerical modelling by the dualpermeability model in HYDRUS-1D was used to simulate the proportion of cumulative effluents leaching from soil macropores. These data showed that steady infiltration rate of effluents at the tree site decreased with increasing soil depth (5.742, 0.716, 0.657, and 0.458 ml/min) but at the bush site first increased and then subsequently decreased with increasing soil depth (0.336, 0.548, 0.974 and 0.379 ml/min).The concentration of effluents at the tree site (0.583, 0.149, 0.147 and 0.067 g/L) and the bush site (0.281, 0.109, 0.161 and 0.053 g/L) decreased nonlinearly with increasing soil depth. Dye staining patterns were significantly different between different soil locations. The largest dark blue staining domains were from 0 to 10 cm soil depths at the tree site and 20-40 cm depths at the bush site. The proportion of cumulative effluents leaching from soil macropores ranged from 37.6% to 61.1% at the tree site and ranged from 0% to 99.9% at the bush site. Understanding the solute transport behaviour in the Yellow River Delta is the first step towards the restoration of degraded wetlands.

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Soil C, N, and P contents and organic phosphorus mineralization in constructed wetlands with different litter input in northern China

Tang,

Chen,

Zhang

2024

J Soils Sediments

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Effects of roots systems on hydrological connectivity below the soil surface in the Yellow River Delta wetland

Cited by 10 publications

References 54 publications

Effects of the Root System Architecture of Pinus taeda and Phyllostachys edulis on the Index of Hydrological Connectivity in Subtropical Forest Ecosystems

Effects of the Root System Architecture of Pinus taeda and Phyllostachys edulis on the Index of Hydrological Connectivity in Subtropical Forest Ecosystems

Dye solution experiments for determining solute transport behaviour in degraded wetland soils of the Yellow River Delta

Soil C, N, and P contents and organic phosphorus mineralization in constructed wetlands with different litter input in northern China

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