نتایج جستجو برای: soil mineralogy
تعداد نتایج: 184575 فیلتر نتایج به سال:
-A cation-exchange capacity (CEC) method based on ion-sieving properties was developed for the quantitative determination of clinoptilolite in soils. In this method, both zeolitic and non-zeolitic exchange sites in the soil sample are saturated with Na t. The CEC of the non-zeolitic exchange sites is determined by replacing the Nain these sites with tert-butylammonium ions. The tert-butylammoni...
1909 Joint contribution of the Institute of Soil, Water, and Environmental Sciences, ARO (603/2007 Series) and USDA-ARS, National Soil Erosion Research Lab.. Soil Sci. Soc. Am. J. 71:1909–1918 doi:10.2136/sssaj2007.0096 Received 8 Mar. 2007. *Corresponding author ([email protected]). © Soil Science Society of America 677 S. Segoe Rd. Madison WI 53711 USA All rights reserved. No part ...
Fire is widely used to clear farms in Iran, while there is little information regarding the effects of fire on the characteristics, especially mineralogy of soils. The objectives of the present study were to 1) compare some physico-chemical properties of burned and unburned soils and 2) evaluate minerals transformation in top soil layer resulting from increasing temperature. Soil samples were t...
We studied mineral and deposition records in a dry lake playa, Sabzevar, northeastern, Iran. For sampling soil and depositional records, 12 samples were taken along Playa surfaces including firm puffy ground, clay-carbonate plain, and salty pan with the dominance of Halite salts. All profiles were excavated by hand auger with a 5 cm diameter head to a depth of ~5 cm. Sediment analysis was carri...
Microbial phenol oxidases and peroxidases mediate biogeochemical processes in soils, including microbial acquisition of carbon and nitrogen, lignin degradation, carbon mineralization and sequestration, and dissolved organic carbon export. Measuring oxidative enzyme activities in soils is more problematic than assaying hydrolytic enzyme activities because of the non-specific, free radical nature...
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