Interactive Effects of O3 and CO2 on the Ponderosa Pine Plant/Litter/Soil System
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Soil pH trends in a sagebrush meadow and Ponderosa pine ecosystem
1. The acidification effect of Ponderosa pine (Pinus ponderosa) needles on soil pH was tested by sampling and measuring pH of soil in areas with ponderosa pine needle litter and without. 2. A total of three depth classes for five samples in each category of pine needles present and absent were collected and analyzed. 3. Statistical analysis of pH data did not indicate statistically significant ...
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cause these plant tissues are the primary substrates for microbial metabolism in soil. Soil microorganisms are limited by the amount and type of plantOzone is a greenhouse gas that is accumulating in the derived substrates entering soil, and we reasoned that changes in the production and biochemical constituents of plant litter produced lower atmosphere, and elevated O3 has the potential to und...
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In this work, we have attempted to review the current knowledge on the impact of elevated CO2, O3, and UV on soils. Elevated CO2 increases labile and stabile soil C pool as well as efficiency of organic pollutants rhizoremediation and phytoextraction of heavy metals. Conversely, both elevated O3 and UV radiation decrease inputs of assimilates to the rhizosphere being accompanied by inhibitory e...
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Human activities are increasing the concentrations of atmospheric carbon dioxide ([CO2]) and tropospheric ozone ([O3]), potentially leading to changes in the quantity and chemical quality of leaf litter inputs to forest soils. Because the quality and quantity of labile and recalcitrant carbon (C) compounds influence forest productivity through changes in soil organic matter content, characteriz...
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NH4 uptake capacity of loblolly pine (Pinus taeda L.) and ponderosa pine (Pinus ponderosa Douglas. Ex Laws.) seedlings that were grown in pots in a phytotron at CO2 partial pressures of 35 or 70 Pa with NH4 + as the sole N source. Kinetics of N-labeled NH4 + uptake were determined in excised roots, whereas total NH4 + uptake and uptake rates were determined in intact root systems following a 48...
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تاریخ انتشار 2004