Factorial combinations of soil compaction and organic matter removal were replicated at the Long Term Site Productivity study in the Croatan National Forest, near New Bern, North Carolina, USA. Ten years after planting, 18 preselected loblolly pine (Pinus taeda L.) trees were destructively harvested to quantify treatment effects on total aboveand below-ground tree biomass and to detect any chan...

ract: At four sites in the Gulf Coastal Plain, mechanical whole-tree harvesting (MWT) removed more biomass nutrients than hand-fell bole-only harvesting (HFBO). Soil compaction and loblolly pine (Pinus tae& L.) regeneraion growq varied among sites. At one location, MWT increased soil bulk density by 0.1 ~ g m ~ , from 1.14 to -24 ~ g m ~ , with no effect on kee growth. At a second location, whe...

Crop rotations that include tap-rooted species of cover crops may help alleviate the deleterious effects of soil compaction on plant growth by modifying soil physical properties. We studied the effects of compaction and cover crops on the least limiting water range (LLWR) and air permeability in the surface layers of a loamy (Exp. 1) and a sandy soil (Exp. 2). There were three compaction treatm...

Sustainable forest production requires an understanding of the effects of site disturbance on tree growth and the consequences of soil amelioration and vegetation control practices. We assessed the impacts of biomass removals at harvest, soil compaction and tillage, and vegetation control on early growth of Douglas-fir in coastal Washington. Harvest treatments included removal of commercial bol...

Waterlogging is one of the major factors limiting the productivity of pastures in the humid tropics. Brachiaria humidicola is a forage grass commonly used in zones prone to temporary waterlogging. Brachiaria humidicola accessions adapt to waterlogging by increasing aerenchyma in nodal roots above constitutive levels to improve oxygenation of root tissues. In some accessions, waterlogging reduce...

Organic matter removal and soil compaction are two types of soil disturbance that occur during forest harvesting activities. Both of these types of disturbance have the potential to reduce the long-term productivity of all vegetation which grows on the site. Quantifying the effects of different levels or organic matter removal and soil compaction is one of the objectives of the LongTerm Soil Pr...

neutron and gamma-ray sources whichenable bulk density and moisture to be determined simultaneously. This instrument has a single probe which provides for both gamma-ray scattering and gamma-ray transmission depending on the required depth of measurement. Surface measurements (0 to 100mm integrated) are made with the backscatter technique (Figure 2) and the measurements between 50 and 300 mm ar...