Water diffusion coefficients of horizontal soil columns from natural saline-alkaline wetlands in a semiarid area

Bai, Junhong; Deng, Wei; Cui, Baoshan; Ouyang, Hao

doi:10.1134/s1064229307060075

Cited by 15 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water diffusion coefficients increased exponentially with increasing movement distances at all soil layers of both wetlands. This was in agreement with the result reported by Bai et al[6] in his study of water diffusion in a saline-alkaline wetland of China. These formulas in the tidal flooding wetland were expressed as forms with the goodness-of-fits of >0.87:Y0À10 ¼ 59:509 expðÀ0:178 xÞ; ðR 2 ¼ 0:906; p < 0:01Þ Y 10À20 ¼ 324:27 expðÀ0:273 xÞ; ðR 2 ¼ 0:875; p < 0:01Þ Y 20À40 ¼ 49:858 expðÀ0:206 xÞ; ðR 2 ¼ 0:887; p < 0:01Þ…”

supporting

confidence: 94%

“…The volumetric soil water contents (u) could be calculated by the weight of the water contents multiplied by the soil bulk densities [6]. The Boltzmann constant (l) and water diffusion coefficients could be calculated according to the following Eqs.…”

Section: Volumetric Water Contents and Water Diffusion Coefficients Imentioning

confidence: 99%

“…Bai et al [6] presented that nitrate-nitrogen can laterally move from riverine soils to adjacent rivers or lakes. Nitrate-nitrogen movement was influenced by soil water content, soil physical properties, and water movement velocity [1].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nitrate–Nitrogen Transport in Horizontal Soil Columns of the Yellow River Delta Wetland, China

Bai

Yang

et al. 2012

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

Horizontal movement of nitrate-nitrogen was simulated in horizontal soil columns from a typical tidal flooding wetland and a short-term flooding wetland of the Yellow River Delta. The primary objectives of this study were to investigate the changes in transport fluxes of nitrate-nitrogen with increasing movement distances and to identify the relationship between transport fluxes of nitrate-nitrogen and water diffusion coefficients. The results showed that the transport fluxes of nitrate-nitrogen were significantly and negatively correlated with movement distances in both wetlands, and decreased exponentially with increasing distances. However, the transport fluxes of nitrate-nitrogen increased exponentially with increasing water diffusion coefficients in both wetlands. The higher transport fluxes of nitrate-nitrogen in surface soils were observed compared to deeper soils, while they were higher in surface soils at the distances near the tracer water head. The findings of this study can contribute to water quality protection by regulating buffer zone width based on the horizontal movement of nitrate-nitrogen.

show abstract

supporting

confidence: 94%

Section: Volumetric Water Contents and Water Diffusion Coefficients Imentioning

confidence: 99%

See 1 more Smart Citation

Nitrate–Nitrogen Transport in Horizontal Soil Columns of the Yellow River Delta Wetland, China

Bai

Yang

et al. 2012

CLEAN Soil Air Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…These parameters were estimate within trial and error calculations. Also the constant d , which scales the water diffusion coefficient, was estimated in such a way that the overall diffusion coefficients were of similar order as observed by Bai et al [2007] and allowed at the same time a sufficient fast exchange between the layers to reproduce observed soil moisture time series. All soil parameters were assumed to be homogeneous within one simulation site of 100 by 100 grid cells, i.e., 25 ha.…”

Section: Generic Model Test Model Sensitivity and The Role Of Latermentioning

confidence: 99%

Simulating plant water availability in dry lands under climate change: A generic model of two soil layers

Tietjen

Zehe

Jeltsch

2009

Water Resources Research

View full text Add to dashboard Cite

[1] Dry lands are exposed to a highly variable environment and face a high risk of degradation. The effects of climate change are likely to increase this risk; thus a profound knowledge of the system dynamics is crucial for evaluating management options. This applies particularly for the interactions between water and vegetation, which exhibit strong feedbacks. To evaluate these feedbacks and the effects of climate change on soil moisture dynamics, we developed a generic, process-based, spatially explicit soil moisture model of two soil layers, which can be coupled with vegetation models. A time scale relevant for ecological processes can be simulated without difficulty, and the model avoids complex parameterization with data that are unavailable for most regions of the world. We applied the model to four sites in Israel along a precipitation and soil type gradient and assessed the effects of climate change by comparing possible climatic changes with present climate conditions. The results show that in addition to temperature, the total amount of precipitation and its intra-annual variability are an important driver of soil moisture patterns. This indicates that particularly with regard to climate change, the approach of many ecological models that simulate water dynamics on an annual base is far too simple to make reliable predictions. Thus, the introduced model can serve as a valuable tool to improve present ecological models of dry lands because of its focus on the applicability and transferability.

show abstract

“…5), and this situation resulted from the oxidation environment of roots, which caused the higher ratio of active Fe/Al oxides in the vegetated region sediments than in the mudflat region sediments. The difference of adsorption-release capacity in the upstream and downstream might result from the decomposition and accumulation of SOM and the changes of salinity under different environmental conditions, and Bai et al (2007) and Liu et al (2012) also found that the TP contents were closely related to SOM content in the wetland soils, and salinity played an important role in soil nutrient change. However, further study concerning the complex mechanism is still needed.…”

Section: Adsorption and Desorption Characteristics On Phosphorus Transportmentioning

confidence: 96%

Phosphorus speciation in wetland sediments of Zhujiang (Pearl) River Estuary, China

Wang

et al. 2013

Chin. Geogr. Sci.

View full text Add to dashboard Cite

Phosphorus fractions and adsorption-release characteristics of sediments in the Zhujiang (Pearl) River estuary wetland were investigated. Results showed that the total phosphorus (TP) content in surface sediments ranged from 648.9 mg/kg to 1064.0 mg/kg; inorganic phosphorus (IP) was the major fraction of TP and ranged from 422.5 mg/kg to 643.9 mg/kg. Among the inorganic phosphorus, the main fractions were phosphorus bound to Al and Fe (Fe/Al-P), and calcium-bound phosphorus (Ca-P), accounting for 23%-42% and 21%-67% of IP, respectively. The vertical distribution of TP contents were significantly positive correlated with organic phosphorus (Org-P) and Fe/Al-P contents. The bio-available phosphorus contents in vertical sediments varied from 128.6 mg/kg to 442.9 mg/kg, mainly existed in Fe-Al/P fraction, and increased from the bottom to top sediments. The transport of phosphorus in sediment-water interface was controlled by the soil characteristics. The active Fe and Al content was considered as the main factor that determines adsorption capacity in vegetated marsh wetland. The P buffering capacity of the sediments in vegetated marsh wetland was greater than that in mudflat wetland. The potential risk of eutrophication in the study area is high. Reducing terrestrial phosphorus discharge and preventing the sediment Fe/Al-P release to the interstitial water are the possible solutions to reduce the risk of eutrophication in estuary wetlands, and planting vegetation in estuary wetland can also reduce the release of phosphorus in surface sediment.

show abstract

Water diffusion coefficients of horizontal soil columns from natural saline-alkaline wetlands in a semiarid area

Cited by 15 publications

References 8 publications

Nitrate–Nitrogen Transport in Horizontal Soil Columns of the Yellow River Delta Wetland, China

Nitrate–Nitrogen Transport in Horizontal Soil Columns of the Yellow River Delta Wetland, China

Simulating plant water availability in dry lands under climate change: A generic model of two soil layers

Phosphorus speciation in wetland sediments of Zhujiang (Pearl) River Estuary, China

Contact Info

Product

Resources

About