Drainage effects on plant diversity and productivity in loblolly pine (Pinus taeda L.) plantations on wet flats

Long-term effects of site preparation and fertilization on total soil CO2 efflux and heterotrophic respiration in a 33-year-old Pinus taeda L. plantation on the wet flats of the Virginia Lower Coastal Plain

“…Greater above ground biomass would produce more carbon inputs to the soil via litter fall, root exudates, and root turnover. To explore this line of reasoning we used above ground biomass data previously collected at the site when the stands were 21 (Hauser et al, 1993) and 33 (Kyle et al, 2005) years old. Kyle et al (2005) found that the above ground volume (pine and hardwood biomass only) did not differ appreciably between site preparation treatments at stand age 33.…”

“…For this study an a level of 0.05 was considered significant. Correlations between soil respiration and above ground biomass by stratum, collected by Hauser et al (1993) on these sites at stand age 21, were performed using PROC CORR. All data manipulation and analyses were performed using SAS 1 (SAS Institute 1999).…”

“…In 1978, Virginia Polytechnic Institute and State University superimposed a fertilization study over the original study creating a split-plot design (Table 1). Andrews (1993), Hauser et al (1993), and Kyle et al (2005) provide more information regarding these sites and how site preparation (drainage) and fertilization impact long-term stand productivity, species diversity, and soil chemical properties.…”

“…The stands were later fertilized at stand age nine. A secondary objective of the present study was to use results on the effects of drainage and fertilization on early seedling growth, hydrology, species diversity, long-term stand productivity, and soil chemical properties from previous investigators to explain any differences observed in F S for these stands (i.e., Young, 1972;Langdon, 1976;Andrews, 1993;Hauser et al, 1993;Kyle et al, 2005).…”

Radial growth of mature pedunculate and sessile oaks in response to drainage, fertilization and weeding on acid pseudogley soils

“…The effect of drainage on the growth of coniferous species is generally favourable in the early stages of the stands (eg, Bialkiewicz, 1976;Wang et al, 1985;Hauser et al, 1993) as well as in mature stands (Pakhuchii, 1978;Dang and Lieffers, 1989;Trettin and Jones, 1989), however sometimes during rainy years only (Vomperskaya, 1980). Less attention has been paid on broad-leaved species, and results are more contrasting, from clear positive effects (Belgrand and Lévy, 1985) to the absence of effect (Kollist, 1975) and even negative effects in young stands (Holstener-Jør-gensen and Bryndum, 1983) as well as in older ones (Holstener-Jørgensen, 1968).…”