نتایج جستجو برای: forest soils
تعداد نتایج: 150689 فیلتر نتایج به سال:
This work was presented at the 12th North American Forest Soils Conference, Whitefish, MT, 16–20 June 2013, in the Forest Change Dynamics and Climate Change session. Soil Sci. Soc. Am. J. 78:S84–S94 doi:10.2136/sssaj2013.11.0463nafsc Received 1 Nov. 2013. *Corresponding author ([email protected]). © Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA All rights reserved. No...
16S rRNA sequences from the phylum Acidobacteria have been commonly reported from soil microbial communities, including those from the Brazilian Savanna (Cerrado) and the Atlantic Forest biomes, two biomes that present contrasting characteristics of soil and vegetation. Using 16S rRNA sequences, the present work aimed to study acidobacterial diversity and distribution in soils of Cerrado savann...
Forest harvesting induces a step change in the climatic variables (temperature and moisture), that control carbon dioxide (CO2) production arising from soil organic matter decomposition within soils. Efforts to examine these vertically complex relationships in situ within soil profiles are lacking. In this study we examined how the climatic controls on CO2 production change within vertically di...
Soil samples were collected in six South American countries in a total of 71 different 1 ha forest plots across the Amazon Basin as part of the RAINFOR project. They were analysed for total and exchangeable cations, C, N, pH with various P fractions also determined. Physical properties were also examined and an index of soil physical quality proposed. A diverse range of soils was found. For the...
Decades of acid rain have acidified forest soils and freshwaters throughout montane forests of the northeastern United States; the resulting loss of soil base cations is hypothesized to be responsible for limiting rates of forest growth throughout the region. In 1999, an experiment was conducted that reversed the long-term trend of soil base cation depletion and tested the hypothesis that calci...
There is limited knowledge about how the interaction of dissolved organic carbon (DOC) and inorganic nitrogen (N) released into the soil just after freezing can affect methane (CH4) uptake in forest soils. Here, we present how freezing treatment and glucose, as a DOC source, can affect the roles of NH4(+)-N and NO3(-)-N in inhibiting soil CH4 uptake, by using soil-core incubation experiments. A...
ABRAMS, MARC D. AND VANESSA L. W. HAYES (School of Forest Resources, Forest Resources Building, Penn State University, University Park, PA 16802). Impacts of contrasting land-use history on composition, soils, and development of mixed-oak, coastal plain forests on Shelter Island, New York. J. Torrey Bot. Soc. 135: 37–52. 2008.—The Mashomack Preserve on Shelter Island, New York contains one of t...
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...
In order to study land degradation from the soil genesis and micromorphological perspective, ten soil profiles were dug and described on five slope positions in both forest and deforested cultivated land. The soil samples were taken from all horizons for physico-chemical analysis and micromorphological studies. Forest soils had a well developed argillic and calcic horizons and also mollic epipe...
All forest fi re events generate some quantity of charcoal, which may persist in soils for hundreds to thousands of years. However, few studies have eff ectively evaluated the potential for charcoal to infl uence specifi c microbial communities or processes. To our knowledge, no studies have specifi cally addressed the eff ect of charcoal on ammonia-oxidizing bacteria (AOB) in forest soils. Con...
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