Now showing items 31-40 of 50
Microbial Community Structure and Oxidative Enzyme Activity in Nitrogen-amended North Temperate Forest Soils
(Springer-Verlag; Spreinger-Verlag, 2004-10)
Large regions of temperate forest are subject to elevated atmospheric nitrogen (N) deposition which can affect soil organic matter dynamics by altering mass loss rates, soil respiration, and dissolved organic matter ...
Extracellular Enzyme Activities and Soil Organic Matter Dynamics for Northern Hardwood Forests receiving Simulated Nitrogen Deposition
(Kluwer Academic Publishers; Springer, 2005-08)
Anthropogenic nitrogen enrichment alters decomposition processes that control the flux of carbon (C) and nitrogen (N) from soil organic matter (SOM) pools. To link N-driven changes in SOM to microbial responses, we measured ...
Fine-root biomass and fluxes of soil carbon in young stands of paper birch and trembling aspen as affected by elevated atmospheric CO 2 and tropospheric O 3
(Springer-Verlag, 2001-07)
Rising atmospheric CO 2 may stimulate future forest productivity, possibly increasing carbon storage in terrestrial ecosystems, but how tropospheric ozone will modify this response is unknown. Because of the importance of ...
Carbon and nitrogen cycling during old-field succession: Constraints on plant and microbial biomass
(Kluwer Academic Publishers; Springer Science+Business Media, 1990-11)
Soil C and N dynamics were studied in a sequence of old fields of increasing age to determine how these biogeochemical cycles change during secondary succession. In addition, three different late-successional forests were ...
Pattern of Kirtland's warbler occurrence in relation to the landscape structure of its summer habitat in northern Lower Michigan
(Kluwer Academic Publishers; SPB Academic Publishing bv ; Springer Science+Business Media, 1992-03)
Studies of the endangered Kirtland's warbler in relation to landscape ecosystems were conducted from 1986–1988 on a large wildfire-burn surrounding Mack Lake in southeastern Oscoda County, Michigan. A landscape ecosystem ...
Assessing alternative futures for agriculture in Iowa, U.S.A.
(Kluwer Academic Publishers; Springer Science+Business Media, 2004-05)
The contributions of current agricultural practices to environmental degradation and the social problems facing agricultural regions are well known. However, landscape-scale alternatives to current trends have not been ...
Nitrogen mineralization, nitrification and denitrification in upland and wetland ecosystems
(Springer-Verlag, 1991-10)
Nitrogen mineralization, nitrification, denitrification, and microbial biomass were evaluated in four representative ecosystems in east-central Minnesota. The study ecosystems included: old field, swamp forest, savanna, ...
Geostatistical analysis of soil properties in a secondary tropical dry forest, St. Lucia, West Indies
(Kluwer Academic Publishers; Springer Science+Business Media, 1994-06)
Spatial variability of soil properties directly influences forest growth. However, spatial variation in soil properties has not been studied within tropical dry forests. As such, it is unclear whether soil properties, like ...