Anthropogenic effects on the physical and chemical properties of subtropical coastal urban soils

2011 ◽  
Vol 28 (1) ◽  
pp. 78-88 ◽  
Author(s):  
D. Hagan ◽  
C. Dobbs ◽  
N. Timilsina ◽  
F. Escobedo ◽  
G. S. Toor ◽  
...  
Polar Record ◽  
2019 ◽  
Vol 55 (2) ◽  
pp. 102-114
Author(s):  
Wojciech Szymański ◽  
Janusz Siwek ◽  
Michał Skiba ◽  
Bronisław Wojtuń ◽  
Aleksandra Samecka-Cymerman ◽  
...  

AbstractSoil is one of the most important constituents of an ecosystem, playing a crucial role in many environmental reactions and processes. Despite the fact that many environmental studies were conducted in the vicinity of Longyearbyen, very little is known about the physical and chemical properties as well as mineralogy of soils occurring in this town. Thus, the main aims of this study were: (1) to determine the texture, chemical properties and mineralogy of the topsoil horizons of urban soils occurring in the Longyearbyen area (Spitsbergen, Norway); and (2) to determine and explain their spatial distribution within the area of Longyearbyen. In general, the topsoils are characterised by loamy texture; acidic reaction; quite high content of total organic carbon (TOC); high content of Si, Al and Fe; and low content of K, Na, Ca, Mg and P. Quartz, K-feldspar, plagioclase, mica and chlorite are the prevailing minerals. Differences in the concentration of TOC, total nitrogen and elements in the topsoils are mainly related to the diversity of texture and mineralogy of the local parent material and the development of vegetation cover. The results indicate that topsoils in Longyearbyen are characterised by the natural properties and are not strongly transformed by human activity. However, pollution of soil with trace elements related to coal mining should be checked.


1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.


2017 ◽  
pp. 31-43
Author(s):  
Berta Ratilla ◽  
Loreme Cagande ◽  
Othello Capuno

Organic farming is one of the management strategies that improve productivity of marginal uplands. The study aimed to: (1) evaluate effects of various organic-based fertilizers on the growth and yield of corn; (2) determine the appropriate combination for optimum yield; and (3) assess changes on the soil physical and chemical properties. Experiment was laid out in Randomized Complete Block Design, with 3 replications and 7 treatments, namely; T0=(0-0-0); T1=1t ha-1 Evans + 45-30-30kg N, P2O5, K2O ha-1; T2=t ha-1 Wellgrow + 45-30-30kg N, P2O5, K2O ha-1; T3=15t ha-1 chicken dung; T4=10t ha-1 chicken dung + 45-30-30kg N, P2O5, K2O ha-1; T5=15t ha-1 Vermicast; and T6=10t ha-1 Vermicast + 45-30-30kg N, P2O5, K2O ha-1. Application of organic-based fertilizers with or without inorganic fertilizers promoted growth of corn than the control. But due to high infestation of corn silk beetle(Monolepta bifasciata Horns), its grain yield was greatly affected. In the second cropping, except for Evans, any of these fertilizers applied alone or combined with 45-30-30kg N, P2O5, K2O ha-1 appeared appropriate in increasing corn earyield. Soil physical and chemical properties changed with addition of organic fertilizers. While bulk density decreased irrespective of treatments, pH, total N, available P and exchangeable K generally increased more with chicken dung application.


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