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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 ...
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 ...
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 ...
Fire, Charcoal, and the Biogeochemistry of Carbon and Nitrogen in Pacific Northwest Forest Soils
The rain shadow forests of the Olympic peninsula represent a unique, mixed-severity fire regime class in the midst of a highly productive landscape where spatial heterogeneity of fire severity may have significant implications for below and aboveground post-fire recovery. The purpose of this study was to quantify the impacts ...
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 ...
The Response of Soil Organic Carbon to Climate Change and Potential to Increase Carbon Sequestration in Soils through Management
As the largest terrestrial carbon pool, changes in soil carbon pools in response to climate change or management practices have the potential to significantly impact atmospheric CO2 concentrations. This dissertation examines the effects of climate change and two management strategies on soil carbon pools in order to understand ...
Nutrient cycling and wood chemistry of sinuous Douglas-fir stands across different genetic gain levels in western Washington
Stem sinuosity is a deformation which occurs in Douglas-fir and other tree species, which can be thought of as the displacement of the stem from its original direction over the total length of displacement. Nutritional deficiencies, such as those of copper, zinc, boron and calcium have been positively associated with increased ...
Impact of Urban Residuals-Based Amendments on Soil Health, Crop Yield, and Nutritional Quality
Biosolids and food scraps are highly prevalent in urban waste streams and can be stabilized for beneficial use as soil amendments. The impact of these amendments on soil health and crop response was tested for two urban soils. One soil was collected from the Tacoma Wastewater Treatment plant and was likely a remnant from plant ...
Nitrate in Forest Soils Following Biosolids Applications in a Working Plantation
Biosolids applications to commercial tree plantations is standard practice in the Pacific Northwest. It has shown to increase stand growth, improve the quality of forest soils, soil and above ground carbon sequestration capacity, and plantation economic returns. However, biosolids applications are currently limited to minimize ...