Temperate forest (15) N isotope trace experiments find nitrogen (N) addition-driven carbon (C) uptake is modest as little additional N is acquired by trees; however, several correlations of ambient N deposition against forest productivity imply a greater effect of atmospheric nitrogen deposition than these studies. We asked whether N deposition experiments adequately represent all processes fou...

The effect of the incubation of zinc (Zn) applied to the soil on Zn uptake and the Zn concentrations in chemical extractants was studied. In a glasshouse experiment using a Zn-deficient gravelly sandy loam, the effect of recently applied Zn was compared with that of Zn incubated with the soil for 15 days at 40°C on growth and Zn uptake by navy beans (Phaseolus vulgaris cv. Gallaroy). At the sec...

Nitrogen incorporation from red alder (Alnus rubra Bong.) into an Oregon upland mesic forest soil was studied by tracing the fate of 15N added as 15N-labeled alder leaf litter. The recovery of 15N in vegetation, litter, lightand heavy-fractions of the soil, the chloroform-labile (microbial biomass) pool, and the whole soil were investigated after a 21-month field incubation of the labeled litte...

The construction of linear transport infrastructure has severe effects on ecosystem functions and properties, and the restoration of the associated roadslopes contributes to reduce its impact. This restoration is usually approached from the perspective of plant cover regeneration, ignoring plant-soil interactions and the consequences for plant growth. The addition of a 30 cm layer of topsoil is...

Forestry harvesting on peats is known to result in significant losses of soil phosphorus (P) to adjacent waters, and the issue is becoming an increasingly serious concern as peatland forest stocks mature and reach harvestable age. One potential solution could be the use of low-cost P recovery techniques based on the chemical precipitation and/or adsorption of the dissolved fraction of soil P, w...

conclusions based on the results of this study there is a risk of infection with soil transmitted helminthes among children of kermanshah, iran. results out of 192 soil samples, soil of play areas from four regions was contaminated with geohelminth eggs. the rate of soil contamination with trichuris spp. eggs was 3.12% while this was 2.1% for hookworm eggs, yet no ascaris eggs were found in the...

Trichloroethylene (TCE) is a chlorinated hydrocarbon used as a solvent in many degreasing and dry-cleaning operations. TCE is one of the most widespread contaminants of soil and groundwater in the United States. It can be found at 50% of the Superfund National Priority List cleanup sites managed by the United State Environmental Protection Agency (USEPA). According to the USEPA, TCE is also abo...

Maintenance of vegetation is a central goal of watershed management. When prescribed burning of chaparral is included in management practice, then it is important for managers to understand and use the natural chaparral fire regime to maximize vegetation response. Variations from the natural fire regime in intensity, frequency, season, and environmental conditions at the time of burning can all...

High-latitude regions store large quantities of organic carbon (C) in permafrost soils and peatlands, accounting for nearly half of the global belowground C pool. Projected climate warming over the next century will likely drive widespread thawing of near-surface permafrost and mobilization of soil C from deep soil horizons. However, the processes controlling soil C accumulation and loss follow...