@article{albaugh_blevins_allen_albaugh_fox_stape_rubilar_2010, title={Characterization of foliar macro- and micronutrient concentrations and ratios in loblolly pine plantations in the southeastern United States}, volume={34}, number={2}, journal={Southern Journal of Applied Forestry}, author={Albaugh, J. M. and Blevins, L. and Allen, H. L. and Albaugh, T. J. and Fox, T. R. and Stape, J. L. and Rubilar, R. A.}, year={2010}, pages={53–64} }
 @article{blevins_prescott_van niejenhuis_2006, title={The roles of nitrogen and phosphorus in increasing productivity of western hemlock and western redcedar plantations on northern Vancouver Island}, volume={234}, ISSN={["1872-7042"]}, DOI={10.1016/j.foreco.2006.06.029}, abstractNote={Early evidence from a suite of fertilization trials on northern Vancouver Island indicated that conifers growing on cedar-hemlock (CH) cutovers were severely deficient in nutrients, particularly N and P, and that fertilization might induce a sustained improvement in tree growth on these sites. Here we report the long-term (15-year) effects of two fertilization experiments which allowed us to distinguish the influences of N and P additions on productivity of western hemlock (Tsuga heterophylla Raf. Sarge) and western redcedar (Thuja plicata Donn.) regenerating on CH sites. Plots of each species were fertilized with N alone, P alone, or N and P combined. Nitrogen was added twice at rates of 0–400 kg/ha, P was added at 0 or 100 kg/ha, and subplots received a second fertilization 10 years after the first. Hemlock responded to the first application of N, and growth was greatest where both N and P were applied. Ten years after the first fertilization, hemlock volume in plots receiving the highest rate of N and P was 10-times that in untreated plots. The second N application increased hemlock growth only in plots that had received P. Fifteen years after the first fertilization, height response of dominant hemlocks was still increasing in plots fertilized with both N and P but was declining in plots fertilized with N alone. In contrast to hemlock, western redcedar stand volume more than doubled 15 years after N fertilization, but there was no additional effect of P fertilization. The long-term growth responses measured in these field experiments support earlier indications that P is an important limiting factor for productivity of conifers, particularly hemlock, on these sites.}, number={1-3}, journal={FOREST ECOLOGY AND MANAGEMENT}, author={Blevins, Leandra L. and Prescott, Cindy E. and Van Niejenhuis, Annette}, year={2006}, month={Oct}, pages={116–122} }
 @article{simard_sachs_vyse_blevins_2004, title={Paper birch competitive effects vary with conifer tree species and stand age in interior British Columbia forests: implications for reforestation policy and practice}, volume={198}, ISSN={["1872-7042"]}, DOI={10.1016/j.foreco.2004.03.036}, abstractNote={Paper birch (Betula papyrifera Marsh) is considered the most important competitive threat to commercially valuable conifers in the highly productive interior cedar–hemlock forests of British Columbia. It is routinely removed from conifer plantations at high cost to increase conifer growth rates and meet reforestation policy regulations. Competitive effects of paper birch and other neighbours on conifer growth were measured in mixed forests to test the hypotheses that the importance and intensity of interspecific competition were (a) high in young plantations; (b) decrease with stand age; (c) decrease with conifer species shade tolerance. Neighbourhood analysis was applied to 748 target conifer trees in 11 stands that included three stand age classes (11, 25, and 50 years-old) and three target conifer species (Douglas-fir (Pseudotsuga menziesii Mirb. Franco), western redcedar (Thuja plicata D. Don), and western larch (Larix occidentalis Nutt.)). All sites had similar site characteristics and disturbance histories. Regression models were used to examine the importance (model adjusted r2) and intensity (model β1) of neighbour competition on target conifer size. Double logarithmic regression models explained on average 38±3% of the variation in target conifer diameter from the neighbourhood index, NRI (neighbourrelativeheightindex)=∑((neighbourbasalarea×height)/targetconiferheight). The models indicated that broadleaf neighbours were more important and intense competitors in the 11- and 25-year-old stands, and conifers were more important and intense competitors in the 50-year-old stands. When all broadleaf and conifer neighbours were included in the models, the intensity and/or importance of neighbour competition decreased in the order of 25>50>11-year-old stands, and western larch>Douglas-fir>western redcedar. Instead of encouraging uniform broadleaf removal across most conifer plantations in the BC interior, reforestation policies should take into account the variable effects of broadleaf competition within stands, across stand ages, and with different tree species compositions.}, number={1-3}, journal={FOREST ECOLOGY AND MANAGEMENT}, author={Simard, SW and Sachs, DL and Vyse, A and Blevins, LL}, year={2004}, month={Aug}, pages={55–74} }