http://www.srs.fs.usda.gov/pubs/20 newest publications from the US Forest Service, Southern Research Station with headquarters in Asheville, North Carolina. http://www.srs.fs.usda.gov/pubs/en-usFri, 20 Aug 2004 01:50:21 CDT http://www.srs.fs.usda.gov/pubs/30625 http://www.srs.fs.usda.gov/pubs/30625 Fri, 15 Aug 2008 10:41:41 -0400 Efroymson, Rebecca A.; Peterson, Mark J.; Welsh, Christopher J.; Druckenbrod, Daniel L.; Ryon, Michael G.; Smith, John G.; Hargrove, William W.; Giffen, Neil R.; Roy, W. Kelly; Quarles, Harry D. habitat, ecological valuation, remediation, contaminated site http://www.srs.fs.usda.gov/pubs/30621 http://www.srs.fs.usda.gov/pubs/30621

Climate change projections predict an intensifying hydrologic cycle and an increasing frequency of droughts, yet quantitative understanding of the effects on ecosystem carbon exchange remains limited

Here, the effect of contrasting precipitation and soil moisture dynamics were evaluated on forest carbon exchange using 2 yr of eddy covariance and microclimate data from a 50-yr-old mixed oak woodland in northern Ohio, USA.

The stand accumulated 40% less carbon in a year with drought between bud-break and full leaf expansion (354 ± 81 g C m⁻² yr⁻¹ in 2004 and 252 ± 45 g C m⁻² yr⁻¹ in 2005). This was caused by greater suppression of gross ecosystem productivity (GEP; 16% = 200 g) than of ecosystem respiration (ER; 11% = 100 g) by drought. Suppressed GEP was traced to lower leaf area, lower apparent quantum yield and lower canopy conductance. The moisture sensitivity of ER may have been mediated by GEP.

The results highlight the vulnerability of the ecosystem to even a moderate drought, when it affects a critical aspect of development. Although the drought was preceded by rain, the storage capacity of the soil seemed limited to 1–2 wk, and therefore droughts longer than this are likely to impair productivity in the region.

]]> Wed, 13 Aug 2008 14:49:02 -0400 Noormets, Asko; McNulty, Steve G.; DeForest, Jared L.; Sun, Ge; Li, Qinglin; Chen, Jiquan canopy conductance, canopy development, drought, ecosystem respiration (ER), gross ecosystem productivity (GEP), leaf expansion, net ecosystem exchange of carbon (NEE), rainfall distribution http://www.srs.fs.usda.gov/pubs/30615 http://www.srs.fs.usda.gov/pubs/30615 Thu, 07 Aug 2008 10:14:52 -0400 Cordell, H. Ken; Betz, Carter, J.; Green, Gary T. http://www.srs.fs.usda.gov/pubs/30614 http://www.srs.fs.usda.gov/pubs/30614 Thu, 07 Aug 2008 09:44:44 -0400 Cordell, H. Ken http://www.srs.fs.usda.gov/pubs/30607 http://www.srs.fs.usda.gov/pubs/30607 Tue, 05 Aug 2008 15:13:19 -0400 Zahner, Robert; Saucier, Joseph R.; Myers, Richard K. http://www.srs.fs.usda.gov/pubs/30604 http://www.srs.fs.usda.gov/pubs/30604 Picea abies (L.) Karst.) sapwood subjected to four different treatments (never-dried, dried and remoistened, acetylated, and furfurylated) was studied during drying at 40°C, at sample average moisture contents above fiber saturation. Spin-spin relaxation time distributions were derived from CPMG relaxation curves using multiexponential fitting (CONTIN), and the resulting water populations were assigned according to the literature and their behavior during drying. It was found that both acetylation and furfurylation increased the average spinspin relaxation time of the lumen water in earlywood tracheids from about 80–100 ms to 200 and 300 ms, respectively. The average spin-spin relaxation time of the cell wall water was reduced from about 1.4 to 0.65 ms by furfurylation, while acetylation had less effect on this water. The relaxation times of both the earlywood lumen water and of the cell wall water were slightly longer for the never-dried samples than for the dried and remoistened samples.]]> Tue, 05 Aug 2008 14:26:27 -0400 Thygesen, Lisabeth G.; Elder, Thomas Time domain, NMR, spin-spin relaxation, wood, moisture, water, acetylation, furfurylation http://www.srs.fs.usda.gov/pubs/30600 http://www.srs.fs.usda.gov/pubs/30600 Tue, 05 Aug 2008 11:49:16 -0400 Xu, Shiqin; Tauer, C.G.; Nelson, C. Dana genetic diversity http://www.srs.fs.usda.gov/pubs/30599 http://www.srs.fs.usda.gov/pubs/30599 Tue, 05 Aug 2008 11:25:54 -0400 Xu, Shiqin; Tauer, C.G.; Nelson, C. Dana Genetic diversity http://www.srs.fs.usda.gov/pubs/30597 http://www.srs.fs.usda.gov/pubs/30597 Thu, 31 Jul 2008 13:51:07 -0400 Rudis, Victor A.; Gramann, James H.; Ruddell, Edward J.; Westphal, Joanne M. Scenic beauty estimation, scenic quality, multiresource forest inventories, vegetative screening, within-season change, regional change http://www.srs.fs.usda.gov/pubs/30596 http://www.srs.fs.usda.gov/pubs/30596 Thu, 31 Jul 2008 13:48:19 -0400 Rudis, Victor A. http://www.srs.fs.usda.gov/pubs/30595 http://www.srs.fs.usda.gov/pubs/30595 Thu, 31 Jul 2008 11:36:33 -0400 Sternitzke, Herbert S.; Pearson, Henry A. http://www.srs.fs.usda.gov/pubs/30594 http://www.srs.fs.usda.gov/pubs/30594 Thu, 31 Jul 2008 11:31:54 -0400 Pearson, H.A.; Grelen, H.E.; Epps, E.A.; Johnson, M.K.; Blakewood, B.W. http://www.srs.fs.usda.gov/pubs/30593 http://www.srs.fs.usda.gov/pubs/30593 Thu, 31 Jul 2008 11:29:01 -0400 Birdsey, Richard A.; Miller, W. Frank; Clark, Jon; Smith, Robert H. http://www.srs.fs.usda.gov/pubs/30592 http://www.srs.fs.usda.gov/pubs/30592 Wed, 30 Jul 2008 14:34:26 -0400 Amatya, Devendra; Trettin, Carl Low-gradient, Coastal plain, forested wetlands, water management, water quality, monitoring, modeling, Francis Marion National Forest http://www.srs.fs.usda.gov/pubs/30591 http://www.srs.fs.usda.gov/pubs/30591 Wed, 30 Jul 2008 12:37:27 -0400 Amatya, Devendra; Trettin, Carl poorly drained soils, forested wetlands, forest management, outflow (runoff ), water budget, water quality, hydrologic modeling, DRAINMOD http://www.srs.fs.usda.gov/pubs/30590 http://www.srs.fs.usda.gov/pubs/30590 Wed, 30 Jul 2008 07:56:21 -0400 Amatya, Devendra M.; Radecki-Pawlik, Artur http://www.srs.fs.usda.gov/pubs/30589 http://www.srs.fs.usda.gov/pubs/30589 Wed, 30 Jul 2008 07:45:34 -0400 Skaggs, R.W.; Chescheir, Amatya, D.M.; Diggs, J.D. drainage, organic soils, hydraulic conductivity, water table, wetland forest http://www.srs.fs.usda.gov/pubs/30588 http://www.srs.fs.usda.gov/pubs/30588 Tue, 29 Jul 2008 16:52:04 -0400 Rosson, James F. Jr.; Thomas, Charles E. biomass, green weight, merchantable weight, residual weight, harvesting, clearcut, basal area, forest ecosystem http://www.srs.fs.usda.gov/pubs/30587 http://www.srs.fs.usda.gov/pubs/30587 Tue, 29 Jul 2008 16:23:15 -0400 Hickman, Clifford A.; Crowther, Kevin D. forest economics, property taxation http://www.srs.fs.usda.gov/pubs/30586 http://www.srs.fs.usda.gov/pubs/30586 Tue, 29 Jul 2008 15:00:53 -0400 Mihalik, Elizabeth N.; Levine, Norm S.; Amatya, Devendra M. Hydrologic modeling, Peak runoff rate, Runoff depth, Curve Number, Runoff Coefficient http://www.srs.fs.usda.gov/pubs/30585 http://www.srs.fs.usda.gov/pubs/30585 Tue, 29 Jul 2008 14:52:27 -0400 Chescheira, G.M.; Skaggsa, R.W.; Amatyab, D.M. Afforestation, Forest hydrology, Water yield, Paired watersheds, Loblolly pine http://www.srs.fs.usda.gov/pubs/30584 http://www.srs.fs.usda.gov/pubs/30584 Tue, 29 Jul 2008 14:52:18 -0400 Ragatz, Richard L.; Cordell, H. Ken Markets, land development, condominiums, recreational properties http://www.srs.fs.usda.gov/pubs/30583 http://www.srs.fs.usda.gov/pubs/30583 Tue, 29 Jul 2008 14:44:28 -0400 Chescheir, George M.; Amatya, Devendra M.; Skaggs, R. Wayne water balance, DRAINMOD, flow duration curve http://www.srs.fs.usda.gov/pubs/30582 http://www.srs.fs.usda.gov/pubs/30582 2300 mm) and 2005, possibly indicating a hydrologic recovery due to canopy closure approximately three years after thinning. Thinning did not affect nutrient concentrations and loading rates, except for NO3-N and total P. The increases in both of these nutrients were minor compared to the values obtained from fertilization of these stands. Results of the study indicate thinning may have only a short term (up to three years) effect on hydrology and water quality of drained pine plantation.]]> Tue, 29 Jul 2008 14:36:57 -0400 Amatya, D.M.; Skaggs, R.W. Loblolly pine, Drainage Outflow, Evapotranspiration, Water Table, Nutrients http://www.srs.fs.usda.gov/pubs/30581 http://www.srs.fs.usda.gov/pubs/30581 Tue, 29 Jul 2008 14:26:34 -0400 Beltran, Bray J.; Amatya, Devendra M.; Jones, Martin; Skaggs, R. Wayne; P.E. Reynolds, William Neal; Callahan, Timothy J.; Nettles, Jami E. Drainage outflow, Nutrient Concentrations, Nutrient Loadings, Water Quality, Paired Watershed.