scholarly journals Vegetation communities and edaphic relationships along a typical coastal saltmarsh to woodland gradient in eastern Tasmania

2019 ◽  
pp. 61-74
Author(s):  
JG Aalders ◽  
P McQuillan ◽  
VN Prahalad
Keyword(s):  
Plant Communities ◽  
Floristic Composition ◽  
Clay Content ◽  
Soil Characteristics ◽  
Particle Size Analysis ◽  
Soil Samples ◽  
Size Analysis ◽  
Edaphic Factors ◽  
Marsh Area ◽  
Winter Sample

Saltmarsh soils impose harsh selection pressures on vegetation resulting in characteristic plant communities. For our study of the effect of edaphic factors on vegetation we chose Long Point in Moulting Lagoon, Tasmania’s largest saltmarsh, which is dominated by a diverse assemblage of halophytic succulents and graminoids. Three transects were established to sample variations in vegetation along the gradient from saltmarsh to woodland. Soil samples were analysed for summer and winter moisture, pH, and electrical conductivity (EC); a mixed summer and winter sample from each point was analysed for soil organic matter (SOM) and carbon. Additionally, a particle size analysis was carried out on all summer samples. Aspects of soil characteristics were aligned to classified vegetation groups and elevation. Moisture, pH, EC, SOM and carbon were all negatively correlated with elevation; the saltmarsh zone displaying higher levels of all variables than those in the adjacent woodland zone. Clay content decreased and sand content increased from the marine margin of the saltmarsh zone to the woodland zone. Within the saltmarsh zone, soil moisture, EC and carbon had highest values in the low marsh area, with values decreasing towards the upper marsh area. This study deepens our understanding of the roles various edaphic factors play in the floristic composition of coastal saltmarshes.

Characterization and Granulometric Correction Soil for the Production of Soil-Cement Blocks for Two Method, Particle Size and X-Ray Florescence to be Inserted in Phase Change Materials (PCMS)

2014 ◽  
Vol 798-799 ◽  
pp. 355-359 ◽  
Author(s):  
Valter Bezerra Dantas ◽  
U.U. Gomes ◽  
A.B. Vital ◽  
G.S. Marinho ◽  
Ariadne de Souza Silva
Keyword(s):  
Particle Size ◽  
Phase Change Materials ◽  
Clay Content ◽  
Particle Size Analysis ◽  
Liquid Limit ◽  
Size Analysis ◽  
X Ray ◽  
Soil Cement

This paper presents the results of tests for characterization of soil samples collected in Mossoró-RN, UFERSA-RN Campus (5 ° 12'34 .68 "South latitude, 37 ° 19 '5.74 "west longitude), for the purpose of producing soil-cement for the manufacture of pressed blocks. Objective of improving the quality of soil-cement, and provide conditions for the use of the soil making it ideal for the production of soil-cement block. Tests of compaction, particle size analysis, plastic limit, liquid limit and correct particle size, X-ray fluorescence and morphology by scanning electron microscopy (SEM). It was concluded that the soil needs correction particle size, due to the high clay content. The method combined grading, sieving, sedimentation and blooming X-ray as the fastest and most accurate in correcting soil particle size.

Pedogenic forms and distribution of potassium in soils along a complex toposequence within Forestry Research Institute of Nigeria, Ibadan

2021 ◽  
Vol 18 (1) ◽  
pp. 38-44
Author(s):  
O.A. Fawole ◽  
R.O. Ojedokun ◽  
L.O. Asabia ◽  
H.O. Shaib-Rahim ◽  
A.I. Oluwaponle
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Clay Content ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Soil Reaction ◽  
Exchangeable K ◽  
Forestry Research ◽  
Topographic Positions ◽  
Research Institute

The study was designed to examine the forms and pedogenic distribution of potassium in soils formed along a toposequence within Forestry Research Institute of Nigeria, Ibadan. Four (4) profile pits were established, described and sampled. Particle size, soil reaction and organic matter were determined in addition to exchangeable K, solution K and Fixed K which were determined using flame  photometer. Results of particle size analysis showed that the silt content is low and varied randomly within the profiles possibly due to their location on the topography. The clay content was relatively high in the genetic B horizons. The exchangeable K, solution K, fixed K and total K varied randomly across the profiles, and this can also be attributed to the topographic positions. Results also showed that there is a high correlation between clay and exchangeable K and between total K and organic matter. This is an indication that soils with high clay content are likely to be rich in exchangeable K and where organic matter in the soil is high, the soil is likely to have a high value of total K Key words: Toposequence, Pedogenic, Potassium

scholarly journals Relações entre as características físicas e morfológica do solo e crescimento de Araucaria angustilofia (Bert.) O. Ktze., em Passo Fundo, RS

1983 ◽  
Vol 5 (5) ◽  
pp. 87
Author(s):  
Carmeli Antonia Cassol ◽  
Ari Zago
Keyword(s):  
Forest Soils ◽  
Linear Correlation ◽  
Clay Content ◽  
Soil Characteristics ◽  
Soil Samples ◽  
National Forest ◽  
Araucaria Angustifolia

This study investigates the relationships between physical and morphological soil characteristics and growth of Araucaria angustifolia in three types of Passo Fundo, RS National Forest Soils. Soil samples were collected at 0-20 cm deep, in randomly chosen 400 m2 area square plots. Relationships between growth of Araucaria angustifolia and soil characteristics were evaluated by means of a simple linear correlation. The soil characteristics that significantly correlated with growth variables were: structure, silt and clay content, and A horizon thickness.

scholarly journals Soil characterization for adobe mixtures containing Portland cement as stabilizer

2020 ◽  
Vol 25 (1) ◽  
Author(s):  
Lucas Miranda Araújo Santos ◽  
José Anselmo da Silva Neto ◽  
Aline Figueirêdo Nóbrega de Azerêdo
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Distribution Curve ◽  
Cement Content ◽  
Clay Content ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Physical And Chemical ◽  
Method Analysis

ABSTRACT One of the most economical ways to build with soil is to use adobe technique. There are several types of soils and most of them are not suitable for using to construct buildings. Physical and chemical characteristics of the soils will influence on its performance to use for buildings. This work aims to characterize physically, chemically and mineralogically two soil samples and study the dosage of mixtures for adobe using Portland cement as stabilizer. It was studied three different Portland cement content (6%, 9% and 12%) in the soil. The results showed that compressive strength of up to 5 MPa at 28 days for both type of soils studied with 12% of Portland cement. In addition, a comparison between two methods used for the particle size analysis of the soils. It was observed that the results differed in each method analysis. Overall this work has shown that to use these soils for adobe bricks, 9% of Portland cement is enough to reach the minimum compressive strength required by standard. Furthermore, this research brings results about the determination of the clay content of the soil, indicating that the traditional method to determine the size distribution curve by sieving and sedimentation may not be the most suitable to check this clay content.

Comparison of shrink-swell indices of some Saskatchewan soils and their relationships to standard soil characteristics

1992 ◽  
Vol 72 (4) ◽  
pp. 429-439 ◽  
Author(s):  
E. De Jong ◽  
L. M. Kozak ◽  
H. B. Storehouse
Keyword(s):  
Surface Area ◽  
Linear Extension ◽  
Clay Content ◽  
Soil Characteristics ◽  
Soil Samples ◽  
Plasticity Index ◽  
Soil Profiles ◽  
Undisturbed Samples ◽  
Standard Soil ◽  
Highly Correlated

Shrink-swell indices for 27 soil samples (representing the major horizons of eight soil profiles) were determined and related to soil texture, organic and inorganic C content, and specific surface area. The coefficient of linear extension was measured from saturation and from 33 kPa matric suction to oven-dryness on undisturbed clods (COLEclod) and on remolded samples of the less than 2-mm fraction (COLErod); the Atterberg limits were determined on the less than 0.4-mm fraction. COLEclod, COLErod and the plasticity index were highly correlated with each other and with clay content and surface area, but not with organic or inorganic C. The extent of the shrinkage was significantly (P > 0.01) related to the water content at the start of the shrinkage test; this relationship was clearer for the remolded than the undisturbed samples, possibly due to the structure of the clods. Key words: Coefficient of linear extension, plasticity index, clods vs. remolded, texture, organic carbon

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