scholarly journals Role of Biochar in Improving Sandy Soil Water Retention and Resilience to Drought

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 407
Author(s):  
Ling Li ◽  
Yong-Jiang Zhang ◽  
Abigayl Novak ◽  
Yingchao Yang ◽  
Jinwu Wang
Keyword(s):  
Climate Variability ◽  
Sandy Soil ◽  
Water Retention ◽  
Sandy Soils ◽  
Crop Productivity ◽  
Future Research ◽  
Soil Water Retention ◽  
The World ◽  
Water Holding

In recent years, plants in sandy soils have been impacted by increased climate variability due to weak water holding and temperature buffering capacities of the parent material. The projected impact spreads all over the world, including New England, USA. Many regions of the world may experience an increase in frequency and severity of drought, which can be attributed to an increased variability in precipitation and enhanced water loss due to warming. The overall benefits of biochar in environmental management have been extensively investigated. This review aims to discuss the water holding capacity of biochar from the points of view of fluid mechanics and propose several prioritized future research topics. To understand the impacts of biochar on sandy soils in-depth, sandy soil properties (surface area, pore size, water properties, and characteristics) and how biochar could improve the soil quality as well as plant growth, development, and yield are reviewed. Incorporating biochar into sandy soils could result in a net increase in the surface area, a stronger hydrophobicity at a lower temperature, and an increase in the micropores to maximize gap spaces. The capability of biochar in reducing fertilizer drainage through increasing water retention can improve crop productivity and reduce the nutrient leaching rate in agricultural practices. To advance research in biochar products and address the impacts of increasing climate variability, future research may focus on the role of biochar in enhancing soil water retention, plant water use efficiency, crop resistance to drought, and crop productivity.

Yields of Sub-humid Rainfed Crops in Relation to Soil Water Retention and Cropping Sequence

1978 ◽  
Vol 14 (3) ◽  
pp. 253-259 ◽  
Author(s):  
H. N. Verma ◽  
S. S. Prihar ◽  
Ranjodh Singh ◽  
Nathu Singh
Keyword(s):  
Water Retention ◽  
Field Experiments ◽  
Sandy Loam ◽  
Sandy Loam Soil ◽  
Yield Response ◽  
Soil Water Retention ◽  
Cropping Sequence ◽  
Loam Soil ◽  
Rabi Crops ◽  
Water Holding

SUMMARYField experiments were conducted for 4 years to study the yield of ‘kharif’ and ‘rabi’ crops grown in sequence on two soils differing in water-holding capacity. The results indicated that drought caused greater reduction in yield of rainy-season crops on loamy sand than on sandy loam soil. In low retentivity soil it was more profitable to raise a single crop of wheat on soil-stored water. In sandy loam soil of higher retentivity, two crops a year gave much higher yields than a single crop. Of the sequences tried, maize followed by wheat gave the highest and most stable yields. For ‘rabi’ crops, stored water showed a better yield response than an equivalent amount of rain during the growing season.

The Role of GIS in City Competitiveness

2013 ◽  
pp. 1476-1501 ◽  
Author(s):  
Khan R. Rahaman ◽  
Júlia M. Lourenço
Keyword(s):  
Decision Making ◽  
Information System ◽  
Spatial Data ◽  
Information Access ◽  
Information Storage ◽  
Future Research ◽  
Gis Technology ◽  
Global Competitiveness ◽  
The World

Virtually every city and region is engaged in activities to improve their relative global competitiveness. The Geographic Information System (GIS) is one of the powerful tools of information storage and information access, providing spatial data to different stakeholders and cities across the world. This chapter will highlight the role of GIS technology in empirical assessment of the competition among cities or regions, using a variety of data assembled by many different individuals, businesses, and institutions. This valuable information can be used in decision-making by stakeholders who are taking part in the competition and can be disseminated, accessed, and updated in a dynamic way. This chapter discusses the origins of urban competitiveness, dynamics and functions of competition, and current and future research possibilities made possible by GIS.

scholarly journals Comparison of three models fitting the soil water retention curves in a degraded alpine meadow region

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Tao Pan ◽  
Shuai Hou ◽  
Yujie Liu ◽  
Qinghua Tan
Keyword(s):  
Soil Water ◽  
Water Retention ◽  
Alpine Meadow ◽  
Soil Depth ◽  
Water Holding Capacity ◽  
Curve Shape ◽  
Soil Water Retention ◽  
Soil Water Holding Capacity ◽  
Water Holding ◽  
Gardner Model

AbstractSoil water retention curve (SWRC) plays an important role in simulating soil water movement and assessing soil water holding capacity and availability. Comparison of fitness between different models to determine the best SWRC model of specific regions is required. In this study, three popular models, van Genuchten, Brooks Corey and Gardner model, were selected for comparing in a degraded alpine meadow region on the eastern Tibetan Plateau. Fitness, error distribution along with key parameters were compared. For each soil horizon, the soil moisture content at all soil water potentials decreased consistently with degradation, thereby integrally moving the SWRCs of all soil depths downward with degradation. The differences in SWRCs across various degradation degrees diminished along with soil depth and soil water potential. The Adj.r2 values of van Genuchten, Brooks Corey and Gardner models ranged in 0.971–0.995, 0.958–0.997, and 0.688–0.909, respectively. The van Genuchten and Brooks Corey models significantly (p < 0.05) outperformed the Gardner model, and have no significant differences in fitness. The fitness of all three models showed no significant changes with degradation. Regardless of degradation degree and soil depth, the fitting error of van Genuchten and Brooks Corey models was mainly distributed in the higher (from –100 hPa to –500 hPa) and lower (below –10000 hPa) potential sections. With regard to the parameters of van Genuchten and Brooks Corey models, the field capacity (θs), and permanent wilting moisture were highly coherent with Adj.r2 values of higher than 0.98, while the curve shape parameter (θr), and air entry pressure of the Brooks Corey model were much lower than those of the van Genuchten model with Adj.r2 values of lower than 0.91. The SWRCs with varying degrees of degradation are best fitted by both van Genuchten and Brooks Corey models but cannot be fitted by Gardner model. Soil water holding capacity decreased with degradation especially in the top soil (0 cm to 30 cm), but the curve shape of all SWRCs did not change significantly with degradation.

scholarly journals Why Beliefs About Emotion Matter: An Emotion-Regulation Perspective

2018 ◽  
Vol 28 (1) ◽  
pp. 74-81 ◽  
Author(s):  
Brett Q. Ford ◽  
James J. Gross
Keyword(s):  
Emotion Regulation ◽  
Clinical Outcomes ◽  
Underlying Mechanism ◽  
Future Research ◽  
Wide Range ◽  
The World ◽  
Emotion Beliefs

The world is complicated, and we hold a large number of beliefs about how it works. These beliefs are important because they shape how we interact with the world. One particularly impactful set of beliefs centers on emotion, and a small but growing literature has begun to document the links between emotion beliefs and a wide range of emotional, interpersonal, and clinical outcomes. Here, we review the literature that has begun to examine beliefs about emotion, focusing on two fundamental beliefs, namely whether emotions are good or bad and whether emotions are controllable or uncontrollable. We then consider one underlying mechanism that we think may link these emotion beliefs with downstream outcomes, namely emotion regulation. Finally, we highlight the role of beliefs about emotion across various psychological disciplines and outline several promising directions for future research.

scholarly journals Effects of Global Climate on Infectious Disease: the Cholera Model

2002 ◽  
Vol 15 (4) ◽  
pp. 757-770 ◽  
Author(s):  
Erin K. Lipp ◽  
Anwar Huq ◽  
Rita R. Colwell
Keyword(s):  
Infectious Disease ◽  
Population Dynamics ◽  
Climate Variability ◽  
Global Climate ◽  
Historical Context ◽  
Disease Outbreaks ◽  
Critical Parameters ◽  
Future Research ◽  
Definition Of

SUMMARY Recently, the role of the environment and climate in disease dynamics has become a subject of increasing interest to microbiologists, clinicians, epidemiologists, and ecologists. Much of the interest has been stimulated by the growing problems of antibiotic resistance among pathogens, emergence and/or reemergence of infectious diseases worldwide, the potential of bioterrorism, and the debate concerning climate change. Cholera, caused by Vibrio cholerae, lends itself to analyses of the role of climate in infectious disease, coupled to population dynamics of pathogenic microorganisms, for several reasons. First, the disease has a historical context linking it to specific seasons and biogeographical zones. In addition, the population dynamics of V. cholerae in the environment are strongly controlled by environmental factors, such as water temperature, salinity, and the presence of copepods, which are, in turn, controlled by larger-scale climate variability. In this review, the association between plankton and V. cholerae that has been documented over the last 20 years is discussed in support of the hypothesis that cholera shares properties of a vector-borne disease. In addition, a model for environmental transmission of cholera to humans in the context of climate variability is presented. The cholera model provides a template for future research on climate-sensitive diseases, allowing definition of critical parameters and offering a means of developing more sophisticated methods for prediction of disease outbreaks.

Assessment of Hydrophilic Biochar Effect on Sandy Soil Water Retention

2017 ◽  
Vol 751 ◽  
pp. 790-795 ◽  
Author(s):  
Ramida Rattanakam ◽  
Pinitpon Pituya ◽  
Mantana Suwan ◽  
Sitthisuntorn Supothina
Keyword(s):  
Soil Water ◽  
Functional Groups ◽  
Sandy Soil ◽  
Water Retention ◽  
Soil Permeability ◽  
Soil Water Retention ◽  
Soil Additives ◽  
Oxygenated Functional Groups ◽  
Factor Governing

This paper reports studies to investigate the relationships between hydrophobicity of biochar surface and soil water retention. The studied biochars were produced from acacia wood, cashew wood and bamboo. The resulting materials were oxidized via liquid oxidation to generate hydrophilic biochars containing oxygenated functional groups on the surface. All biochars were characterized and their ability as soil additives to enhance water retention was assessed. Our results suggest that hydrophobicity/hydrophilicity of biochars is not the major factor governing water retention ability of this particular soil. However, hydrophilicity of biochar helps improve soil permeability by providing better wettability to the soil.

scholarly journals The hysteretic response of a shallow pyroclastic deposit

2021 ◽  
Vol 13 (6) ◽  
pp. 2541-2553
Author(s):  
Luca Comegna ◽  
Emilia Damiano ◽  
Roberto Greco ◽  
Lucio Olivares ◽  
Luciano Picarelli
Keyword(s):  
Water Retention ◽  
Initial Conditions ◽  
Automatic Monitoring ◽  
Time Domain Reflectometry ◽  
Soil Water Retention ◽  
Wetting And Drying ◽  
Soil Response ◽  
Rainfall Depth ◽  
Steep Slopes

Abstract. In the last decades, in Campania (southern Italy), steep slopes mantled by loose air-fall pyroclastic soils have been the seat of shallow, fast, rainfall-induced landslides. The occurrence of such events has been the result of the combination of critical rainstorms and of unfavourable initial conditions determined by antecedent infiltration, evaporation, and drainage processes. In order to understand the nature of the phenomena at hand and to clarify the role of all influencing factors, an automatic monitoring station has been installed in an area already subject to a recent killer flowslide (December, 1999). The paper reports data collected in 2011 about volumetric water content and suction (used to investigate the soil water retention features) and rainfall depth and temperature (providing the boundary conditions). In particular, the installation at the same depths of tensiometers and time domain reflectometry (TDR) sensors allowed us to recognise the hysteretic nature of the wetting and drying soil response to weather forcing and its influence on the slope stability conditions. The data reported in the paper are freely available at https://doi.org/10.5281/zenodo.4281166 (Comegna et al., 2020).

scholarly journals Analysis of potential liquefaction of sandy soils using effective confining pressure

2020 ◽  
Vol 156 ◽  
pp. 02013
Author(s):  
Siti Nur Indah Sari
Keyword(s):  
Safety Factor ◽  
Sandy Soil ◽  
Sandy Soils ◽  
Confining Pressure ◽  
Resistance Ratio ◽  
Liquefaction Potential ◽  
Cyclic Resistance ◽  
The World ◽  
Cyclic Resistance Ratio ◽  
Central Sulawesi

Earthquake disasters are some of the most frequent disasters in the world. One of the impacts of earthquakes is liquefaction. Indonesia is earthquake-prone and has been negatively impacted by liquefaction. Recently liquefaction resulting from an earthquake in Palu, Central Sulawesi caused losses in terms of material and lives motivating a more detailed study of this risk to reduce it in the future. In this study, an analysis of the liquefaction potential of sandy soil was carried out by varying the effective confining pressure to produce a graph relating fine contents (FC) to cyclic resistance ratio (CRR).The value of the cyclic resistance ratio is needed to determine the safety factor for potential liquefaction.

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