scholarly journals Soil–water characteristic curves of extracellular polymeric substances-affected soils and sensitivity analyses of correlated parameters

2020 ◽  
Author(s):  
Han Zhang ◽  
Jianmin Bian ◽  
Hanli Wan ◽  
Nan Wei ◽  
Yuxi Ma
Keyword(s):  
Biological Activity ◽  
Extracellular Polymeric Substances ◽  
Sandy Soils ◽  
Fine Sand ◽  
Water Holding Capacity ◽  
Sensitivity Analyses ◽  
Model Parameters ◽  
Protein Components ◽  
Correlated Parameters ◽  
Water Holding

Abstract Quantifying the manners in which biological activity may alter the hydraulic properties of soils (SWCCs) is vital for understanding and engineering water pollution and supply systems. The study used centrifugation and a sand funnel method to determine the SWCCs of pure sandy soils with different particle sizes and sandy soils mixed with different extracellular polymeric substance (EPS) analogs. Sensitivity of correlated parameters for SWCCs obtained using a van Genuchten (VG) model was analyzed by a single-factor perturbation analysis. The results show (1) that fine sand has the strongest water retention ability. (2) The more polysaccharide contents in the media, the stronger its water-holding capacity. Polysaccharide not only has its strong water holding capacity, but also changed the structure of medium to increase water holding capacity. The humic acid and protein components had little effect on the hydrodynamic properties of fine sandy soil. (3) Sensitivity analyses revealed that the saturated water content, θs, greatly affected the ability of solute transport to reach equilibrium concentrations. Therefore, it is very necessary to define the range of media particles and component content,and ensure the accuracy of VG model parameters in the practical application of soil media affected by biological activity.

scholarly journals Analysis of soil and vegetation patterns in semi-arid Mediterranean landscapes by way of a conceptual water balance model

2008 ◽  
Vol 12 (3) ◽  
pp. 899-911 ◽  
Author(s):  
I. Portoghese ◽  
V. Iacobellis ◽  
M. Sivapalan
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Water Holding Capacity ◽  
Sensitivity Analyses ◽  
Vegetation Types ◽  
Study Region ◽  
Mediterranean Landscapes ◽  
Soil Water Holding Capacity ◽  
Water Holding ◽  
Semi Arid

Abstract. This paper investigates the impact of various vegetation types on water balance variability in semi-arid Mediterranean landscapes, and the different strategies they may have developed to succeed in such water-limited environments. The existence of preferential associations between soil water holding capacity and vegetation species is assessed through an extensive soil geo-database focused on a study region in Southern Italy. Water balance constraints that dominate the organization of landscapes are investigated by a conceptual bucket approach. The temporal water balance dynamics are modelled, with vegetation water use efficiency being parameterized through the use of empirically obtained crop coefficients as surrogates of vegetation behavior in various developmental stages. Sensitivity analyses with respect to the root zone depth and soil water holding capacity are carried out with the aim of explaining the existence of preferential soil-vegetation associations and, hence, the spatial distribution of vegetation types within the study region. Based on these sensitivity analyses the degrees of suitability and adaptability of each vegetation type to parts of the study region are explored with respect of the soil water holding capacity, and the model results were found consistent with the observed affinity patterns.

Yield potential of reduced-branching lupins (Lupinus angustifolius) on sandy soils in a short season environment

1986 ◽  
Vol 37 (6) ◽  
pp. 611 ◽  
Author(s):  
J Hamblin ◽  
R Delane ◽  
A Bishop ◽  
J Gladstones
Keyword(s):  
Sandy Soils ◽  
Lupinus Angustifolius ◽  
Water Holding Capacity ◽  
Yield Potential ◽  
Wide Range ◽  
Short Season ◽  
Water Holding

Experiments that compare the yield potential of reduced branching narrow-leafed lupins with that of the conventional branched types show that on sandy soils of low water-holding capacity in a short season environment, reduced-branching lupins have a higher yield potential than current cultivars. The yield potential of these new types appears to be maintained over a wide range of environmental yield levels. L. angustifolius was higher yielding than L. albus or L. cosentinii genotypes of similar maturity.

Effect of olive oil cake on water holding capacity of sandy soils in Libya

1993 ◽  
Vol 24 (4) ◽  
pp. 409-413 ◽  
Author(s):  
R.M. El-Asswad ◽  
A.O. Said ◽  
M.T. Mornag
Keyword(s):  
Olive Oil ◽  
Sandy Soils ◽  
Water Holding Capacity ◽  
Water Holding

scholarly journals Assessing potential of biochar for increasing water-holding capacity of sandy soils

GCB Bioenergy ◽  
2012 ◽  
Vol 5 (2) ◽  
pp. 132-143 ◽  
Author(s):  
Andres S. Basso ◽  
Fernando E. Miguez ◽  
David A. Laird ◽  
Robert Horton ◽  
Mark Westgate
Keyword(s):  
Sandy Soils ◽  
Water Holding Capacity ◽  
Water Holding

scholarly journals Analysis of soil and vegetation patterns in semi-arid Mediterranean landscapes by way of a conceptual water balance model

2007 ◽  
Vol 4 (5) ◽  
pp. 3909-3952 ◽  
Author(s):  
I. Portoghese ◽  
V. Iacobellis ◽  
M. Sivapalan
Keyword(s):  
Water Balance ◽  
Soil Water ◽  
Water Holding Capacity ◽  
Sensitivity Analyses ◽  
Vegetation Types ◽  
Study Region ◽  
Mediterranean Landscapes ◽  
Soil Water Holding Capacity ◽  
Water Holding ◽  
Semi Arid

Abstract. This paper investigates the impact of various vegetation types on water balance variability in semi-arid Mediterranean landscapes, and the different strategies they may have developed to succeed in such water-limited environments. Water balance constraints are assumed to dominate the organization of landscapes and a conceptual bucket approach is adopted to model the temporal water balance dynamics, with vegetation water use efficiency being parameterized through the use of empirically obtained crop coefficients as surrogates of vegetation behavior in various developmental stages. Sensitivity analyses with respect to the root zone depth and soil water holding capacity are carried out with the aim of investigating the existence of preferential soil-vegetation associations and, hence, the spatial distribution of vegetation types within the study region. Based on these sensitivity analyses the degrees of suitability and adaptability of each vegetation type to parts of the study region are explored with respect of the soil water holding capacity, and the model results were found to be able to explain the observed affinity patterns. Finally, the existence of such preferential association between soil water holding capacity and vegetation species is verified through an extensive soil survey available in the study region.

scholarly journals Benefits of treating a sandy soil with a crosslinked-type polyacrylamide

2006 ◽  
Vol 46 (4) ◽  
pp. 579 ◽  
Author(s):  
S. Sivapalan
Keyword(s):  
Water Use ◽  
Sandy Soil ◽  
Sandy Soils ◽  
Fold Increase ◽  
Water Holding Capacity ◽  
Deep Percolation ◽  
Irrigation Interval ◽  
Glasshouse Experiment ◽  
Soybean Plants ◽  
Water Holding

The productivity of sandy soils is mostly limited by their low water-holding capacity and excessive deep percolation losses, which reduce the efficiency of water and fertiliser use by plants. The effect of a crosslinked-type polyacrylamide, ALCOSORB 400, on water-holding capacity of a sandy soil, siliceous sands, was studied under the laboratory and glasshouse conditions. Water-holding capacity of the soil exposed to 0.01 MPa increased by 23 and 95% by adding 0.03 and 0.07% of polyacrylamide to the soil, respectively. This indicated that the soil treated with polyacrylamide was able to store more water than untreated soil, thereby reducing the potential losses due to deep percolation in sandy soils. However, the polyacrylamide in the treated soil did not significantly increase the quantity of water released from the soil by increasing the pressure from 0.01 to 1.5 MPa. The results from the first glasshouse experiment demonstrated that the excess amount of water stored in the soil by polyacrylamide was available to plants and resulted in higher water use and grain production. Consequently, there was a 12 and 18 fold increase in water use efficiency of soybean plants grown in soils treated with 0.03 and 0.07% polyacrylamide, respectively. The results from the second glasshouse experiment demonstrated that increasing amounts of polyacrylamides in a sandy soil can extend the irrigation interval without any adverse effect on the grain yield of soybeans.

scholarly journals Application of soil amendments as a strategy for water holding capacity in sandy soils

2021 ◽  
Vol 724 (1) ◽  
pp. 012014
Author(s):  
A Herawati ◽  
Mujiyo ◽  
J Syamsiyah ◽  
S K Baldan ◽  
I Arifin
Keyword(s):  
Soil Amendments ◽  
Sandy Soils ◽  
Water Holding Capacity ◽  
Water Holding
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