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Now showing items 1-10 of 14
Land-Use Changes in Southwestern Guatemala: Assessment of their Effects and Sustainability
(2013-07-23)
Land-use changes in the Pacific coastal plain of southwest Guatemala have accelerated in the past twenty years as native arable and pasture lands have been converted at an increasing rate to oil palm and banana plantations. This study of the changes during this period has been made by remote-sensing analyses calibrated to ...
An Examination of Stand Attributes and the Presence of English holly in a Pacific Northwest Forest, Grays Harbor County, Wash.
(2013-07-23)
English holly (<italic>Ilex aquifolium</italic>) is an ornamental favored by people who appreciate its wildlife benefits and traditional significance. Since its introduction into the Pacific Northwest over one hundred years ago, (<italic>Ilex(</italic> has escaped from cultivation and is increasingly found in natural areas ...
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 ...
Irrigation with Reclaimed Water: Implications for Subsurface Recharge
(2013-04-17)
To determine the suitability of using reclaimed water for subsurface recharge, a soil column greenhouse study was performed to examine the leaching characteristics of two soil types irrigated with two types of class A reclaimed water: 1) membrane bioreactor (MBR) and 2) sand filter (SF) tertiary filtered wastewater, with tap ...
Modeling habitat suitability of Pinus densiflora in response to climate change in the Korean peninsula and East Asia
(2013-02-25)
The current and future climate suitability of Pinus densiflora in the Korean peninsula, Japan Isles, and parts of northen China was modeled using Random Forest predictors. Pinus densiflora is among the tree species with highest conservation priorities for its historical and cultural importance but distribution of the species ...
Reforesting surface coal-mined land using Douglas-fir seedlings in Washington State
(2013-07-25)
The Surface Mining Control and Reclamation Act of 1977 regulates the reclamation of surface-mined land in the United States. It uses a performance bond program to ensure sufficient resources to reclaim lands after mining. In the Appalachian region, the Forestry Reclamation Approach has led to successful reforestation of ...
Harvest intensity and competing vegetation control have little effect on soil carbon and nitrogen pools in a Pacific Northwest Douglas-fir plantation
(2013-07-25)
Increasing demand for timber as well as current interest in the use of woody biomass for energy and chemical production may result in higher quantities of organic matter removal from plantation forests than currently occurs during harvesting. Two practices that can increase the yield of woody biomass from a harvest site are ...
Riparian Vegetation Structure and Composition in the Fire-Prone Ecosystem of Eastern Washington
(2013-11-14)
The objectives of this study were to compare riparian and upland areas, summarize the range of vegetation conditions present in the second half of the 20th century, and correlate vegetation with processes on the landscape. Matching research to management, the spatial extent of the study was the area managed by the Tapash ...
Effects of agricultural drainage ditch maintenance on water temperature in the Snoqualmie River valley, Washington State
(2013-07-25)
Water temperature profoundly affects the health of freshwater ecosystems and is an increasing water quality concern in the Pacific Northwest, where warm stream temperatures can threaten the survival and growth of already endangered salmonid species. Agricultural drainage ditches exist to improve drainage off fields but are ...
Cylindrocarpon Species in Pacific Northwest Douglas-fir Nurseries: Diversity and Effects of Temperature and Fungicides on Mycelial Growth
(2013-07-25)
Douglas-fir nurseries play an important economic role in the Pacific Northwest timber industry, but the early death of seedlings due to disease influences regeneration success. A destructive root disease caused by fungus Cylindrocarpon results in the loss of seedlings in early stages of their growth. The objectives of this ...