Soil C 0 2 efflux across four age classes of plantation loblolly pine ( Pinus taeda L . ) on the Virginia Piedmont
نویسنده
چکیده
Soil C 0 2 efflux resulting from rnicrobinl and root respiration is a major cornponent of the forest C cycle. In this investigation, we examined in detail how soil C 0 2 efflux differs both spatially and temporally with rcspeit to stand age for loblolly pine (Pinus rrrecio LA.) plantations on the Virginia Pied~rront. Througlrout a 12-month period, efflux rates were rncasured both near the base of trees arid midway between planting rows it1 stands of four age classes. Mean soil C 0 2 efflux rates rneasured during the 12-non nth study were 1.72, 2.58, 2.84, and 2.90 prnollrn'ls for 1-to 2-year-old, 4-to 6-year-oltf, 8-to 12-year-old, and 20-to 25-year-old stands, respectively. Tiine series analysis I-cvcalcd that stand age had :i significant effect on soil C 0 2 efflux rate. Additionally, mean efflux rates wcrc consistently higher near the tree and rime series analysis revealed that rneasurerncnt position had a significant effect on soil CO, efflux rate. Mean soil C 0 2 effiux rates, by position, for the 12-month study wcrc 2.72 and 2.28 Itn~ol/~n2/s for the near and away rireasurenrent positions, rcspectively. Ilegression analysis was used to exanline the i~lfluence of soil and climatic factors or1 seasorial changes in soil C 0 2 efflux. The r~iost influential factors affecting soil COz efflux during the 12-month study wcrc soil temperature, soil moisture. stand age, ant1 lrreasuremerrt position. We hclicve respiring roots significaritly influence soil COz efflux of planiation loblolly pine antf account for di1fi.1-cnces observcd betwcc~r starrds of dift'crerrt ages ;is well as spatial differences observed within a given starrd. $') 2003 tilsevier B.V. All rights reserved.
منابع مشابه
SOIL CO2 EFFLUX ACROSS FOUR AGE CLASSES OF PLANTATION LOBLOLLY PINE (Pinus taeda L.) ON THE VIRGINIA PIEDMONT
متن کامل
Soil CO2 efflux in loblolly pine (Pinus taeda L.) plantations on the Virginia Piedmont and South Carolina Coastal Plain over a rotation-length chronosequence
We measured soil surface CO2 efflux (Fs) in loblolly pine stands (Pinus taeda L.) located on the Virginia Piedmont (VA) and South Carolina Coastal Plain (SC) in efforts to assess the impact climate, productivity, and cultural practices have on Fs in the managed loblolly pine ecosystem. The effect of stand age on Fs was examined using a replicated chronosequence approach in which stands ranging ...
متن کاملSoil Co2 Efflux and Soil Carbon Content as Influenced by Thinning in Loblolly Pine Plantations on the Piedmont of Virginia
The thinning of loblolly pine plantations has a great potential to influence the fluxes and storage of carbon within managed stands. This study looked at the effects of thinning on aboveground carbon and mineral soil carbon storage, 14-years after the thinning of an 8-year-old loblolly pine plantation on the piedmont of Virginia. The study also examined soil respiration for one year following t...
متن کاملDetermining the best form factor formula for Loblolly Pine (Pinus taeda L.) plantations at the age of 18, in Guilan- northern Iran
In order to determine the best form factor formula for Loblolly Pine (Pinus taeda L.) plantations in Talesh (Western Guilan province-Iran), a number of 110 trees were selected based on their distribution in diameter classes, from 12 to 34 cm (in a two- cm diameter interval). First, several quantitative factors including diameter at breast height, diameter at 0.65 m of height, and diameter at st...
متن کاملWhole-tree and forest floor removal from a loblolly pine plantation have no effect on forest floor CO2 efflux 10 years after harvest
Intensive management of southern pine plantations has yielded multifold increases in productivity over the last half century. The process of harvesting merchantable material and preparing a site for planting can lead to a considerable loss of organic matter. Intensively managed stands may experience more frequent disturbance as rotations decrease in length, exposing the stands to conditions tha...
متن کامل