Loblolly pine (Pinus tueda L.) occurs naturally on soils that are frequently low in fertility and water availability (Allen et al., 1990; Schultz 1997). Despite these limitations, this species maintains a high level of productivity on most sites (Schultz, 1997). Knowledge of plantation loblolly pine root system growth and physiology is needed to understand how this species is adapted to soil re...

NADPH:protochlorophyllide oxidoreductase (POR) catalyzes the light-dependent reduction of protochlorophyllide (Pchlide) to chlorophyllide (Chlide), a key regulatory step in chlorophyll biosynthesis. In most angiosperms, POR is encoded by a small nuclear gene family, containing at least two differentially-expressed genes designated porA and porB. We have demonstrated that the PORs of loblolly pi...

In the transition between Mediterranean forest and the arid subtropical shrublands of the southeastern Iberian Peninsula, humans have transformed habitat since ancient times. Understanding the role of the original mosaic landscapes in wildlife species and the effects of the current changes as pine forest plantations, performed even outside the forest ecological boundaries, are important conserv...

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 ...

Timber harvests remove a significant portion of ecosystem carbon. While some of the wood products moved off-site may last past the harvest cycle of the particular forest crop, the effect of the episodic disturbances on long-term on-site carbon sequestration is unclear. The current study presents a 25 year carbon budget estimate for a typical commercial loblolly pine plantation in North Carolina...

In this study we analyzed the effects of silvicultural treatments on carbon (C) budgets in Pinus taeda L. (loblolly pine) plantations in the southeastern United States. We developed a hybrid model that integrated a widely used growth and yield model for loblolly pine with published allometric and biometric equations to simulate in situ C pools. The model used current values of forest product co...