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The Effects of Compaction on the Hydrologic Properties of Forest Soils in the Sierra Nevada

The Effects of Compaction on the Hydrologic Properties of Forest Soils in the Sierra Nevada PDF Author: Peter H. L. Cafferata
Publisher:
ISBN:
Category : Sierra Nevada (Calif. and Nev.)
Languages : en
Pages : 160

Book Description


The Effects of Compaction on the Hydrologic Properties of Forest Soils in the Sierra Nevada

The Effects of Compaction on the Hydrologic Properties of Forest Soils in the Sierra Nevada PDF Author: Peter H. L. Cafferata
Publisher:
ISBN:
Category : Sierra Nevada (Calif. and Nev.)
Languages : en
Pages : 160

Book Description


The Effects of Compaction on Hydrologic Properties of Forest Soils in the Sierra Nevada

The Effects of Compaction on Hydrologic Properties of Forest Soils in the Sierra Nevada PDF Author: Peter Herman Louis Cafferata
Publisher:
ISBN:
Category : Forest soils
Languages : en
Pages : 282

Book Description
This study evaluated the effects of a crawler tractor, a rubber-tired skidder, and a torsion suspension vehicle on several soil and hydrologic properties in the western Sierra Nevada Mountains of California. Four sites, with soil textural classes ranging from a loam to a loamy sand and elevations between 680 and 2180 m, were studied at three moisture contents. Compaction was monitored with a double probe nuclear densiometer and an air permeameter after 1, 3, 6, 10, 15, and 20 round trips. Density measurements were made at five different depths. Infiltration capacities were determined with a small, portable rainfall simulator. Soil core samples were taken to observe porosity and conductivity levels before and after disturbance. Compaction, or the change in bulk density, was significantly greater on the crawler tractor trails at all depths. When only the plots established in the outer positions of the trails were included, this distinction between vehicles could not be made. The crawler tractor generated more uniform compaction across its trails that either the torsion suspension vehicle or the rubber-tired skidder. The greatest change in bulk density for all the vehicles took place in the surface five centimeters. Infiltration capacities on the undisturbed sites were found to exceed predicted maximum precipitation rates. Mineral soil at the three higher elevation sites was very hydrophobic. This was thought to be due to the coating of soil particles with the metabolic products of fungal mycelia. The crawler tractor reduced infiltration capacities by 78 percent, while the torsion suspension vehicle and the rubber-tired skidder caused 67 percent decreases. Suspended sediment concentrations determined from runoff collected on the infiltration plots served as an erosion index for the skid trails. The crawler tractor trails had runoff with 40 percent higher sediment loads than that found on the trails of the other two skidders. Organic matter content was inversely correlated with the sediment levels. Air permeability readings showed that the three vehicles produced very similar reductions in macroporosity in the surface 2.5 cm layer as the number of trips increased. Approximately 75 percent of the decrease in macropore space occurred by six trips. The air permeameter provided a relatively good index of compaction. Porosity and conductivity levels determined from the soil core samples showed that machine differences did not exist in the track position. Macropore space was r2duced 43 percent and the conductivity decreased 80 percent. Site differences were much more evident than vehicle differences. Observations made after one over-wintering period showed that measureable recovery had not occurred.

Landslide Activity in the Sierra Nevada During 1982 and 1983

Landslide Activity in the Sierra Nevada During 1982 and 1983 PDF Author:
Publisher:
ISBN:
Category : Landslides
Languages : en
Pages : 84

Book Description


Vegetation Management for Reforestation (CA,OR,NV)

Vegetation Management for Reforestation (CA,OR,NV) PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 428

Book Description


Final Environmental Impact Statement, Pacific Southwest Region, Vegetation Management for Reforestation: Appendixes A through H

Final Environmental Impact Statement, Pacific Southwest Region, Vegetation Management for Reforestation: Appendixes A through H PDF Author: United States. Forest Service. Pacific Southwest Region
Publisher:
ISBN:
Category : Afforestation
Languages : en
Pages : 428

Book Description


Soil Disturbance and Compaction in Wildland Management

Soil Disturbance and Compaction in Wildland Management PDF Author: Earl B. Alexander
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 204

Book Description


Payette National Forest (N.F.), Gaylord North Timber Sale Project

Payette National Forest (N.F.), Gaylord North Timber Sale Project PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 606

Book Description


Lichens and Air Pollution in the San Gabriel Wilderness, Angeles National Forest, California

Lichens and Air Pollution in the San Gabriel Wilderness, Angeles National Forest, California PDF Author: Maile Neel
Publisher:
ISBN:
Category : Air
Languages : en
Pages : 64

Book Description


Ten-years Results of Forest Fertilizaiton in California

Ten-years Results of Forest Fertilizaiton in California PDF Author: Scott R. Miles
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 88

Book Description


Deschutes National Forest (N.F.), Kelsey Vegetation Management Project

Deschutes National Forest (N.F.), Kelsey Vegetation Management Project PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 496

Book Description