Title page for ETD etd-05142012-123606


Type of Document Master's Thesis
Author Nash, Whitney Laine
Author's Email Address wlnash@vt.edu
URN etd-05142012-123606
Title Long-Term Effects of Rock Type, Weathering and Amendments on Southwest Virginia Mine Soils
Degree Master of Science
Department Crop and Soil Environmental Sciences
Advisory Committee
Advisor Name Title
Daniels, Walter Lee Committee Chair
Burger, James A. Committee Member
Strahm, Brian D. Committee Member
Zipper, Carl E. Committee Member
Keywords
  • pedogenesis
  • topsoil substitute
  • revegetation
  • mine spoil
Date of Defense 2012-02-03
Availability restricted
Abstract
This study measured the effects of spoil type and amendments on Appalachian mine soil properties over time. The Controlled Overburden Placement Experiment was installed in 1982 in two parts, the Rock Mix (RM) Experiment compares mixes of sandstone (SS) and siltstone (SiS) spoils while the Surface Amendment (SA) Experiment compares a fertilized control (CON), sawdust (SD at 112 Mg ha-1), topsoil (TS–15 cm), and biosolids (BS) at 22, 56, 112 & 224 Mg ha-1. Both experiments were sampled in 2008 and compared with historical data. After 26 years, all RM treatments had higher silt+clay and decreased sand. Mine soil pH and electrical conductance (EC) were lower in high SS spoils and overall pH was lower and EC higher in surface layers. Fe-oxides increased over time and adversely affected extractable P. Exchangeable cations and total N increased in all treatments. Annual C-sequestration rates were 0.51 Mg ha-1 for 1:1 SS:SiS and 0.32 Mg ha-1 for SiS. In the SA experiment, extractable P and exchangeable cations increased over time in organically amended plots. The CON and TS sequestered C at 0.54 Mg ha-1 and 0.87 Mg ha-1 annually while higher BS and SD treatments lost C, but mobilized significant C into their subsoils. In the SA, an apparent C retention maximum of 30-35 Mg ha-1 was noted. Overall, rock type and amendment effects were still evident after 26 years and the long-term benefits of organic amendments were reflected in sustained higher C, exchangeable cations, total N and P levels.
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