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The Effects of Different Harvest Intensities on the Distribution of Soil Phosphorus and Nutrient Stocks in a Brazilian Oxisol
Forest soils form an important reservoir in ecosystem nutrient and carbon budgets, which are crucial for sustained productivity of forests. Nutrient fluxes and transformations in forest soils are a result of a complex interchange between the atmosphere, plants, and soil. Consequently, soils are a critical source of plant ...
Locally produced wood biochar increases nutrient retention in agricultural soils of the San Juan Islands, WA, USA
Biochar additions to agricultural soil have been shown to result in many benefits; however, most studies have been conducted in greenhouse or laboratory trials with few being conducted in the field and particularly in association with organic farming systems. Herein, this gap was addressed by conducting on-farm studies on ...
Identifying Mycorrhizas Present in Bigleaf Maple Canopy and Forest Floor Soils in a Coastal Old-Growth Temperate Rainforest in Western Washington
The temperate rainforests of Western Washington are known for their old-growth forests and unique ecosystem processes. In these stands of old-growth, it is common for trees to be 200-300 years old. On branches, Epiphytic mats form in the canopy. The bottom layer of these mats starts to decompose over time, forming a layer of ...
Douglas-Fir Stump Decomposition:Modeling Carbon Residence Times
Stumps are a significant portion of the woody debris in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation forests in western Washington State. Very few studies have attempted to quantify the amount of carbon that is held in stumps or the rate at which that carbon is lost. This study assessed carbon and nitrogen ...
Diversity of ammonia-oxidizing archaea in soils under managed and native conditions
Ammonia oxidizing archaea (AOA) contribute to a significant portion of ammonia oxidation in soil. These organisms have significant impacts on plant proliferation, as well as production of fugitive gases. AOA community distribution patterns are influenced by multiple factors, of which, biogeography has emerged as an important ...
Metal response of Douglas-fir: a comparison of foliar metals and phytochelatin production in trees planted in soils amended with biosolids or metal salts
(2013-11-14)
This study was designed to explore the relationship between metals in soil, foliar metal concentrations and phytochelatin (PC) production in Douglas-fir trees planted in soils amended with biosolids or metal salts. Both a greenhouse and field study were conducted to determine whether PC production could be correlated with ...
Evaluation of Northwestern Seattle Parking Strip Soil for Urban Horticulture Land Use and Urban Food Production
(2013-04-17)
With urban agriculture on the rise in many cities, areas for urban agriculture and vegetable gardening practices are being explored. The parking strip, street side right-of-way land, is a proposed area for vegetable gardening in Seattle. In the Northwest corner of Seattle, 141 acres of parking strips have been identified. ...
Deep Soil: Quantification, Modeling, and Significance of Subsurface Carbon and Nitrogen
Soil is the primary sink for C in forest ecosystems, but is often overlooked in ecosystem C budgets. Efforts to quantify C pools often sample soils to a depth of 0.2 m despite observations that deep soil C is neither scarce nor entirely stable. This study examined the systematic sampling depth for ecosystem C analyses in the ...
Reservoir Sediment Carbon along the Elwha River after Dam Removal
Worldwide, numerous dams are aging and will either need to be replaced or removed within the next few decades. Little is understood about the fate of carbon stored in sediments that become soil when a reservoir is drained due to dam removal. This study assessed the pool of carbon in the sediments of former Lake Mills and ...
Canopy soils, litterfall and litter decomposition in a coastal old-growth temperate rainforest, Washington
(2013-11-14)
The canopy of trees has been an unreachable portion for scientific exploration until few decades ago, and the wonders and enigmas that the treetops enclose are increasingly unfolding. This study investigated the canopy environment and its epiphytes on the formation of canopy soil, transfers of biomass and N to the ground and ...