Mapping Soil Salinization of Agricultural Coastal Areas in Southeast Spain

Abstract This study sought to further the current understanding on the relationship between soil salinization and groundwater hydrochemical processes. To this effect, 33 soil samples and 64 shallow groundwater samples were collected in Cangzhou City, a coastal region of the North China Plain. Soil salinization showed clear patterns of zonation from inland to coastal areas. The no-salinization or mild-salinization with Cl-SO4 or SO4-Cl types were discovered in the west of Cang County farther from the sea; this was restricted by brackish groundwater with HCO3·SO4-Ca·Na type and the deep water table. With increasing proximity to the coastline, groundwater salinity increased soil salt content and salinization, the effects of which were mainly determined by specific Cl/Br ratios and the seawater mixing index in groundwater. The positive δ18O and δ2H content in groundwater was related to the strong evaporation of groundwater with a shallow water table, indicating that the high soil salinity directly affected relict seawater evaporation. The observed severe-salinization soil and high NO3− concentrations indicate that agricultural activities were non-negligible salt sources in areas close to the sea. The results have relevance in improving saline-alkali soil and utilization of soil resources in the coastal areas in the North China Plain.

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The Applicability of Remote Sensing Models of Soil Salinization Based on Feature Space

Sustainability ◽

10.3390/su132413711 ◽

2021 ◽

Vol 13 (24) ◽

pp. 13711

Author(s):

Jing Liu ◽

Li Zhang ◽

Tong Dong ◽

Juanle Wang ◽

Yanmin Fan ◽

...

Keyword(s):

Remote Sensing ◽

Soil Salinity ◽

Feature Space ◽

Soil Salinization ◽

Coastal Areas ◽

Future Research ◽

Landsat 8 ◽

Distribution Maps ◽

Inversion Model ◽

Yanqi Basin

Soil salinization is a major challenge for the sustainable use of land resources. An optimal remote sensing inversion model could monitor regional soil salinity across diverse geographical areas. In this study, the feature space method was used to study the applicability of the inversion model for typical salt-affected soils in China (Yanqi Basin (arid area) and Kenli County (coastal area)), and to obtain soil salinity grade distribution maps. The salinity index (SI) surface albedo (Albedo)model was the most accurate in both arid and coastal regions with overall accuracy reaching 93.3% and 88.8%, respectively. The sensitivity factors for the inversion of salinity in both regions were the same, indicating that the SI-Albedo model is applicable for monitoring salinity in arid and coastal areas of China. We combined Landsat 8 Operational Land Imager image data and field data to obtain the distribution pattern of soil salinity using the SI-Albedo model and proposed corresponding countermeasures for soil salinity in the Yanqi Basin and Kenli County according to the degree of salinity. This study on soil salinity in arid and coastal areas of China will provide a useful reference for future research on soil salinity both in China and globally.

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Application of a Vertical “Electric Sieve” to Mitigate and Prevent Salinization in Coastal Soil

10.22541/au.163358793.39924737/v1 ◽

2021 ◽

Author(s):

Yuehua Li ◽

Lin Zhao ◽

Menglu Huang ◽

Liang Chen

Keyword(s):

Electrical Conductivity ◽

Surface Layer ◽

Surface Soil ◽

Soil Column ◽

Shallow Groundwater ◽

Similar Efficacy ◽

Soil Salinization ◽

Coastal Areas ◽

Minimum Value ◽

Control Column

This study explored the application of a Vertical Electrokinetic system (V-EK) with multilayer electrodes in shallow soil to form an “Electric Sieve” to mitigate and prevent the soil salinization caused by salts rising from shallow groundwater in the coastal areas. In the model V-EK system, the electric resistances of soil column, reversely corresponding to salinity, at the applied voltages 4, 10 and 20 V were 266, 487 and 1272 Ω, respectively. Meanwhile, lower electrical conductivity (EC, between 67-230 μs/cm) were observed in the soil within 50 cm below the surface at the voltages of 10 V and 20 V, which was much lower than the minimum value (581 μs/cm) of the control with no current applied. For the control column without EK treatment (0 V), soil in the surface layer had the highest EC value at 1721 μS/cm due to the salts rising from the bottom, and the EC values of soil beneath the surface were in the range of 581-1127 μS/cm. Compared to control column, the level of ions in the surface soil significantly declined after V-EK treatment, especially for the column with voltage at 10 V and 20V. When voltage was at 20 V, Na+ was detected at a range of 0.06-0.08mg/g in the surface soil, a >99% reduction when compared to the controls. Similar efficacy was observed for chloride (Cl-), in the V-EK column with the voltages at 10 V and 20V.

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Characterization and evolution of spearfishing in Madeira archipelago, Eastern Atlantic

Aquatic Living Resources ◽

10.1051/alr/2020015 ◽

2020 ◽

Vol 33 ◽

pp. 15

Author(s):

Roi Martínez-Escauriaza ◽

Claudio Vieira ◽

Lídia Gouveia ◽

Nuno Gouveia ◽

Margarida Hermida

Keyword(s):

Fish Species ◽

Young Men ◽

Coastal Areas ◽

Teleost Fishes ◽

The North ◽

Southeast Coast ◽

Madeira Archipelago ◽

First Time

Data obtained from licenses of spearfishers and surveys conducted in 2004 and 2017 allowed for the analysis, for the first time, of the practice of spearfishing in the Madeira archipelago. Only a small percentage of the population practices spearfishing, mostly local young men. Most of them practice the activity with a partner throughout most of the year and along most of the island's coastal areas, although preferentially along the North and Southeast coast. Results show how, in recent years, despite the population of spearfishers decreasing, the abundance in the annual catch potentially increased, probably due to the higher investment of time in this activity. It has been observed that many fishers complement their catches with manual collecting of invertebrates. Overall, 40 teleost fishes and also 4 crustaceans and 8 molluscs were identified. The most frequently captured fish species were parrotfish and white seabream, while limpets were the most collected invertebrates in both selected periods.

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Hormonal stimulation and some risk factors studied to improve bovine pregnancy rate at the Coastal areas of Barisal district of Bangladesh

Bangladesh Veterinary Journal ◽

10.32856/bvj-2018.030 ◽

2018 ◽

Vol 52 (1-4) ◽

pp. 22-30

Author(s):

A K Paul ◽

S M T Rahman

Keyword(s):

Pregnancy Rate ◽

Coastal Region ◽

Hormonal Treatment ◽

Coastal Areas ◽

Pregnancy Rates ◽

Hormonal Stimulation ◽

Crossbred Cows ◽

Treatment Groups ◽

History Of ◽

Group A

Hormonal treatment of cows at the coastal region of Barisal district of Bangladesh was performed to assess the improvement of pregnancy rate. A total of 100 cows and heifers with irregular history of cyclicity were selected randomly and divided into five treatment groups. The groups were A (treated with anthelmintic), B (treated with anthelmintic, vitamin ADE and multivitamin powder), C (treated with PGF2α), D (treated with GnRH) and E (treated with GnRH and PGF2α). Each group comprised of 20 animals. The age, breed and parity of experimental cows were considered during treatment. In the study, the cows treated with both GnRH and PGF2α (group E) showed significantly (p<0.05) higher estrus (80%) and pregnancy rate (60%) than that of group A, B, C and D. The overall estrus rates of local and crossbred cows were 64% and 70%, respectively and the pregnancy rates were 40 and 52%, respectively. The crossbred cows responded significantly (p<0.05) to hormonal treatment than that of local cows. Parity-2 cows showed higher estrus sign than that of other parities. However, the pregnancy rates were higher significantly (p<0.05) in parity-2 and parity ≥4 cows than that of parity-0, parity-1 and parity-3 cows. The pregnancy rate was also found higher in case of 4 to <5 years old cows than that of 2 to <3, 3 to <4, 5 to <6, and ≥6 years old. It may conclude that the hormonal regimen increases the pregnancy rate as well as decreases the undesired waiting of estrus and conception. Further study with more sample size will reveal the more effective treatment for cows at the coastal areas of Bangladesh.

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Hormonal stimulation and some risk factors studied to improve bovine pregnancy rate at the Coastal areas of Barisal district of Bangladesh

Bangladesh Veterinary Journal ◽

10.32856/10.32856/bvj-2018.03 ◽

2018 ◽

Vol 52 (1-4) ◽

pp. 22-30

Author(s):

A K Paul ◽

S M T Rahman

Keyword(s):

Pregnancy Rate ◽

Coastal Region ◽

Hormonal Treatment ◽

Coastal Areas ◽

Pregnancy Rates ◽

Hormonal Stimulation ◽

Crossbred Cows ◽

Treatment Groups ◽

History Of ◽

Group A

Hormonal treatment of cows at the coastal region of Barisal district of Bangladesh was performed to assess the improvement of pregnancy rate. A total of 100 cows and heifers with irregular history of cyclicity were selected randomly and divided into five treatment groups. The groups were A (treated with anthelmintic), B (treated with anthelmintic, vitamin ADE and multivitamin powder), C (treated with PGF2α), D (treated with GnRH) and E (treated with GnRH and PGF2α). Each group comprised of 20 animals. The age, breed and parity of experimental cows were considered during treatment. In the study, the cows treated with both GnRH and PGF2α (group E) showed significantly (p<0.05) higher estrus (80%) and pregnancy rate (60%) than that of group A, B, C and D. The overall estrus rates of local and crossbred cows were 64% and 70%, respectively and the pregnancy rates were 40 and 52%, respectively. The crossbred cows responded significantly (p<0.05) to hormonal treatment than that of local cows. Parity-2 cows showed higher estrus sign than that of other parities. However, the pregnancy rates were higher significantly (p<0.05) in parity-2 and parity ≥4 cows than that of parity-0, parity-1 and parity-3 cows. The pregnancy rate was also found higher in case of 4 to <5 years old cows than that of 2 to <3, 3 to <4, 5 to <6, and ≥6 years old. It may conclude that the hormonal regimen increases the pregnancy rate as well as decreases the undesired waiting of estrus and conception. Further study with more sample size will reveal the more effective treatment for cows at the coastal areas of Bangladesh.

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Assessment of land-use change in coastal areas through geographical information systems

RECUBRIMIENTO COMESTIBLE CON BASE DE PIÑON MEXICANO (Jatropha curcas) SOBRE LA CALIDAD DE CHAYOTE MINIMAMENTE PROCESADO ◽

10.32854/agrop.v13i10.1872 ◽

2020 ◽

Vol 13 (10) ◽

Author(s):

Verónica Lango-Reynoso ◽

Karla Teresa González-Figueroa ◽

Fabiola Lango-Reynoso ◽

María del Refugio Castañeda-Chávez ◽

Jesús Montoya-Mendoza

Keyword(s):

Land Use ◽

Land Use Change ◽

Geographical Information Systems ◽

Design Methodology ◽

Scientific Information ◽

Coastal Ecosystems ◽

Coastal Areas ◽

Geographical Information ◽

Coastal Zones ◽

Computer Based

Objective: This article describes and analyzes the main concepts of coastal ecosystems, these as a result of research concerning land-use change assessments in coastal areas. Design/Methodology/Approach: Scientific articles were searched using keywords in English and Spanish. Articles regarding land-use change assessment in coastal areas were selected, discarding those that although being on coastal zones and geographic and soil identification did not use Geographic Information System (GIS). Results: A GIS is a computer-based tool for evaluating the land-use change in coastal areas by quantifying variations. It is analyzed through GIS and its contributions; highlighting its importance and constant monitoring. Limitations of the study/Implications: This research analyzes national and international scientific information, published from 2007 to 2019, regarding the land-use change in coastal areas quantified with the digital GIS tool. Findings/Conclusions: GIS are useful tools in the identification and quantitative evaluation of changes in land-use in coastal ecosystems; which require constant evaluation due to their high dynamism.

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