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Keyword: soil compaction

Soil compaction studies

Documents and Media Posted on: November 21, 2018
Growth reduction in trees due to soil compaction on skid trails has been shown to occur for as long as 32 years after harvest (Wert and Thomas 1981). The amount of compation that occurs is related to soil moisture content, with drier soils being much less affected than moist ones (Steinbrenner and Gessel 1955; Hatchell et al. 1970; Wert and Thomas 1981).Document Type: Other Documents

Effectiveness of a winged subsoiler in ameliorating a compacted clayey forest soil

Documents and Media Posted on: November 07, 2018
Machine piling of slash and brush after harvest is commonly practiced when establishing new conifer plantations. However, it can result in increased soil bulk density, decreased soil macroporosity, and increased soil strength, thus reducing conifer root development and above-ground growth (Froehlich 1979, Sands and Bowen 1978).Document Type: Other Documents

Region 1 soil compaction study: Final report to the United States Forest Service

Documents and Media Posted on: November 02, 2018
Eighteen forest soil pedons (boralfs and ochrepts) in the Bitterroot, Flathead and Kootenai National Forests were characterized and 54 pedons evaluated for the existence of soil compaction. The soils were examined over a range of parent materials: Tertiary Volcanics, limestone dominated glacial till and quartzite dominated glacial till.Document Type: Other Documents

An evaluation of four implements used to till compacted forest soils in the Pacific Northwest

Documents and Media Posted on: November 02, 2018
Since 1941, the Forest Research Laboratory--part of the College of Forestry at Oregon State University in Corvallis --has been studying forests and why they are like they are. A staff of more than 50 scientists conducts research to provide information for wise public and private decisions on managing and using Oregon’s forest resources and operating its wood-using industries.Document Type: Other Documents

Compaction of forest soils

Documents and Media Posted on: November 02, 2018
As with food crop production in the last few decades, timber production in recent years has become increasingly dependent on mechanized equipment. Many common forest management practices, from site preparation to harvest, now involve some type of heavy machinery. Mechanization typically improves the time- and cost-efficiency of these forest operations.Document Type: Other Documents

Soil compaction and conifer growth after tractor yarding at three coastal Washington locations

Documents and Media Posted on: October 26, 2018
We measured soil density and tree growth after wet-season, ground-based yarding on fine-textured soils at three clear-cut sites. Four treatment conditions were sampled on or near four skid trails (replicates): non-tilled and tilled primary skid trails, and adjacent slash-treated areas; the fourth treatment was secondary skid trails at two locations and a logged-only control at the third location.Document Type: Other Documents

Conceptual model for predicting forest productivity losses from soil compaction

Documents and Media Posted on: October 26, 2018
A simple, conceptual model for predicting forest productivity losses from soil compaction is presented. Information regarding each component of the model is summarized. Once compacted, most forest soils in the Pacific Northwest are expected to remain compacted and forest growth affected for several decades. Elements within the model which managers are able to manipulate to influence the amount of soil.Document Type: Other Documents

Compaction of forest soils: A review

Documents and Media Posted on: October 24, 2018
The problem of soil compaction in forestry differs from that in agriculture because of differences in the nature of the crop, in particular the weight and size of the plant members and the length if time that they persist. The roots compact the soil as they increase in size, but they also transmit the weight of the tree and forces generated by the wind onto the soil.Document Type: Other Documents

Mechanized fuel treatment effects on soil compaction in Sierra Nevada mixed-conifer stands

Documents and Media Posted on: October 03, 2018
The immediate need to treat forest fuels is often justified as a need to reduce potential fire behavior as well as improve or maintain forest health. Millions of hectares are at risk of unusually severe fires in the United States, and fuel treatments are being prescribed at unprecedented scales. In many cases, mechanical treatments with heavy equipment are the most efficient or economical method to reduce fuels.Document Type: Other Documents

Progress towards more uniform assessment and reporting of soil disturbance for operations, research, and sustainability protocols

Documents and Media Posted on: September 21, 2018
International protocols, such as those of the Montreal Process (MP), specify desired outcomes without specifying the process and components required to attain those outcomes. We suggest that the process and its components are critical to achieve desired outcomes.Document Type: Other Documents