Dynamics and characterization of Soil Organic Matter in Mine Soils Sixteen Years After Amendment With native Soil, Sawdust, And Sludge

摘要

Soil organic matter (SOM) is an improtant indicator of soil quality and site productivity. Organic amendments may be a means for amelioratign mine soils and other soils that have een depleted of organic matter. In 1982, a mined site was amended with seven different surface treatments: a control, 30 cm of native soil, 112 Mg ha~-1. Four replicates of each reatment were installed as a randomized complete block design. Each replicate was subsequently split according to vegetation type: pitch x loblolly pine hybrid (Pinus rigida x taeda) trees and Kentucky-31 tall fescue (Festuca arundinacea Schreb.). Soil analyses of composite samples indicated that organic amendments initially improved C and N status of the mine soil,s but after 16 years their levels converged to that of the cotnrol treatment. tree volume and biomass were used as indices of the effects of organic matter content 16 years after initial amendment. Individual tree volumes of the sawdust and 22, 56, 112 Mg ha~-1 SS treatments retained 18 to 26