scholarly journals Seasonal Variation in Chemical Characteristics of Soil Organic Matter of Grazed and Ungrazed Mixed Prairie and Fescue Grassland

1977 ◽  
Vol 30 (3) ◽  
pp. 195 ◽  
Author(s):  
J. F. Dormaar ◽  
A. Johnston ◽  
S. Smoliak
Keyword(s):  
Organic Matter ◽  
Seasonal Variation ◽  
Soil Organic Matter ◽  
Chemical Characteristics ◽  
Mixed Prairie

scholarly journals CO2-C losses and carbon quality of selected Maritime Antarctic soils

2012 ◽  
Vol 25 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Juliana Vanir De Souza Carvalho ◽  
Eduardo De Sá Mendonça ◽  
Newton La Scala ◽  
César Reis ◽  
Efrain Lázaro Reis ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Temperature ◽  
Soil Carbon ◽  
Humic Substances ◽  
Microbial Activity ◽  
Chemical Characteristics ◽  
Maritime Antarctic ◽  
Antarctic Soils ◽  
Humification Degree

AbstractPolar Regions are the most important soil carbon reservoirs on Earth. Monitoring soil carbon storage in a changing global climate context may indicate possible effects of climate change on terrestrial environments. In this regard, we need to understand the dynamics of soil organic matter in relation to its chemical characteristics. We evaluated the influence of chemical characteristics of humic substances on the process of soil organic matter mineralization in selected Maritime Antarctic soils. A laboratory assay was carried out with soils from five locations from King George Island. We determined the contents of total organic carbon, oxidizable carbon fractions of soil organic matter, and humic substances. Two in situ field experiments were carried out during two summers, in order to evaluate the CO2-C emissions in relation to soil temperature variations. The overall low amounts of soil organic matter in Maritime Antarctic soils have a low humification degree and reduced microbial activity. CO2-C emissions showed significant exponential relationship with temperature, suggesting a sharp increase in CO2-C emissions with a warming scenario, and Q10 values (the percentage increase in emission for a 10°C increase in soil temperature) were higher than values reported from elsewhere. The sensitivity of the CO2-C emission in relation to temperature was significantly correlated with the humification degree of soil organic matter and microbial activity for Antarctic soils.

scholarly journals Grazing Impacts on Litter and Soil Organic Matter in Mixed Prairie and Fescue Grassland Ecosystems of Alberta

1991 ◽  
Vol 44 (1) ◽  
pp. 7 ◽  
Author(s):  
M. A. Naeth ◽  
A. W. Bailey ◽  
D. J. Pluth ◽  
D. S. Chanasyk ◽  
R. T. Hardin
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Grazing Impacts ◽  
Grassland Ecosystems ◽  
Mixed Prairie

Relationship between soil chemical characteristics and soil-borne fungi in tomato tunnels of Punjab, Pakistan

2019 ◽  
Vol 48 (3) ◽  
pp. 409-416
Author(s):  
Arshad Javaid ◽  
Freeha Anjum ◽  
Rashid Mahmood ◽  
Naureen Akhtar
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Sample ◽  
Soil Ph ◽  
Pathogenic Fungi ◽  
Fungal Species ◽  
Soil Samples ◽  
Chemical Characteristics ◽  
Solanum Lycopersicum L ◽  
Soil Borne Fungi

Soil pH, ECe, N, K, P and organic matter in 12 soil samples collected from different tomato (Solanum lycopersicum L.) tunnels were in the range of 7.7 - 8.3, 0.40 - 2.45 dS/cm, 0.02 - 0.10%, 40 - 282 ppm, 12 - 123 ppm and 0.42 - 2.02%, respectively. A total of 20 fungal species belonging to ten genera, namely Aspergilus, Alternaria, Cladosporium, Drechslera, Emericella, Fusarium, Mortierella, Mucor, Penicillium and Sclerotium were isolated from the soil samples using direct and dilution plate techniques. Total number of fungal colonies ranged from 450 - 2700/g soil in different soil samples. Among these, number of colonies of saprophytic and pathogenic fungi were 432 - 2070 and 10 - 954/g soil sample, respectively. Number of pathogenic colonies was significantly and positively correlated with soil organic matter and N. The soil organic matter and nitrogen favoured population of pathogenic fungi in tomato tunnels.

Abundance, vegetation, and environment of four patch types in a northern mixed prairie

1992 ◽  
Vol 70 (2) ◽  
pp. 277-284 ◽  
Author(s):  
Charles E. Umbanhowar Jr.
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Species Diversity ◽  
South Dakota ◽  
Patch Size ◽  
Similar Amount ◽  
North Central ◽  
Mixed Prairie ◽  
Central South ◽  
Ant Mounds

The importance of concurrent disturbances to the maintenance of plant species diversity in grasslands has been emphasized by several authors, but there are few studies comparing different disturbances at the same site. In this study the size, abundance, vegetation, and environment of thatching ant mounds, earthen mammal mounds, bison wallows, and openings in dry marshes are compared in a northern mixed prairie in north central South Dakota. Patch size and abundance varied considerably between patch types. Ant and earthen mammal mounds were the smallest but most abundant patch types. Bison wallows and dry marshes were larger and occurred less frequently than ant and earthen mounds. Different patch types occupied a similar amount of area. Ordination of patch vegetation revealed marked between-type compositional differences; ant and earthen mounds were dominated by vegetatively reproducing perennials, while annuals occurred more abundantly in bison wallows and dry marshes. Many species were restricted to either wallows or marshes. Levels of nitrate, phosphorus, soil organic matter, and other environmental factors varied significantly between patch types. Different patch types supported different groups of species, and patch vegetation was a product of mechanism of patch creation, patch environment, and location. Key words: ant mounds, disturbance, earthen mounds, northern mixed prairie, patches, potholes, wallows.

Cultivation and Reseeding Effects on Soil Organic Matter in the Mixed Prairie

2010 ◽  
Vol 74 (4) ◽  
pp. 1348-1355 ◽  
Author(s):  
Xiaoyu Wang ◽  
Walter D. Willms ◽  
Xiying Hao ◽  
Mengli Zhao ◽  
Guodong Han
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Mixed Prairie
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