Abstract
The effects of intercropping with alfalfa and initial tree spacing on fiber properties in Populus nigra var. betulifolia are reported on the basis of a study of 15 trees. The trees were harvested from an agroforestry trial near Karaj city, Iran. Treatments included four initial spacings of 3 m × 4 m, 3 m × 6.7 m, 3 m × 8 m, and 3 m × 10 m intercropped with alfalfa as nitrogen-fixing plant, as well as one 3 m × 4 m treatment without alfalfa. Results showed that initial spacing and intercropping with alfalfa increased the growth rate. Also, alfalfa-intercropping had increasing effects on all fiber dimensions, especially on diameter and wall thickness. The effect of initial spacing on fiber attributes based on ring numbers was not statistically significant; however, whole-disk fiber length, weighted by ring area, was increased with stem diameter. The reason for this increase may be traced to the fact that much of the basal area of fast-growing trees is concentrated in farther rings from the pith that have longer fibers. Clear correlation was not found between fiber length and growth rate and therefore, no firm conclusion can be made in this regard.
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References
Bannan MW (1967) Sequential changes in rate of anticlinal division, cambial cell length, and ring width in the growth of coniferous trees. Can J Bot 45:1359–1369
Chaudhry AK (2003) Comparative study of different densities of poplar in wheat based agroforestry system in central Punjab. PhD thesis, University of Agriculture, Faisalabad
Chen PYS, Zhang G, Van Sambeek JW (1998) Relationships among growth rate, vessel lumen area, and wood permeability for three central hardwood species. For Prod J 48:87–90
DeBell JD, Gartner BL, DeBell DS (1998) Fiber length in young hybrid Populus stems grown at extremely different rates. Can J For Res 28:603–608
DeBell DS, Christopher RK, Barbara LG (2002a) Wood density of Eucalyptus saligna grown in Hawaiian plantations: effects of silvicultural practices and relation to growth rate. Aust For 64(2):106–110
DeBell DS, Singleton R, Harrington A, Gartner LB (2002b) Wood density and fiber length in young Populus stems: relation to clone, age, growth rate, and pruning. Wood Fiber Sci 34(4):529–539
Dinwoodie JM (1965) The relationship between fiber morphology and paper properties: A review of literature. Tappi (48):440–447
Doungpet M (2005) Environment and genetic effects on wood quality of Populus. PhD thesis. NCS university. Department of Wood and Paper science, USA
Efhami Sisi D, Karimi AN, Pourtahmasi K, Taghiyari HR, Asadi F (2010) The effects of agroforestry practices on vessel properties in Populus nigra var. betulifolia. IAWA J 31(4):487–781
Efhami D, Asadi F, Karimi A, Pourthamasi K (2008) Study on the initial spacing and intercropping of Alfalfa on bole form and annual growth rate of Populus nigra betulifolia. The first Iranian conference on supplying raw materials and development of wood and paper industries. Agriculture and Natural Resources University of Gorgan, Iran
Franklin GL (1945) Preparation of thin sections of synthetic resins and wood-resin composites, and a new macerating method for wood. Nature 155:51
Fujiwara S, Yang KC (2000) The relationship between cell length and ring width and circumference growth rate in five Canadian species. IAWA J 21(3):335–345
Huang R, Furukawa I (2000) Horizontal variations of vessel element length and wood fiber length of two kinds of poplars planted in the desert areas of China. J Japan Wood Res Soc 46(6):450–495
Jiang ZH, Wang XQ, Fei BH, Ren HQ, Liu X (2007) Effect of stand and tree attributes on growth and wood quality characteristics from a spacing trial with Populus xiaohei. Ann For Sci 64:807–814
Koubaa A, Hernandez RE, Beaudoin M, Poliquin J (1998) Interclonal, intraclonal, and within-tree variation in fiber length of poplar hybrid clones. Wood Fiber Sci. 30(1):40–47
Matyas C, Peszlen I (1997) Effect of age on selected wood quality traits of poplar clones. Silvae Genetica 46(2–3):64–72
Panshin AJ, Dezeeuw C (1980) Textbook of wood technology, 4th edn. McGraw-Hill, New York, p 722
Pitre EF, Janice EKC, Mackay JJ (2007) Short-term effects of nitrogen availability on wood formation and fiber properties in hybrid poplar. Trees J 21:249–259
Saarsalmi A, Kukkola M, Moilanen M, Arola M (2006) Long-term effects of ash and N fertilization on stand growth, tree nutrient status and soil chemistry in a Scots pine stand. For Ecol Manag 235:116–128
Shanavas A, Kumar BM (2006) Physical and mechanical properties of three agroforestry tree species from Kerala, India. J Trop Agric 44(1–2):23–30
Skelton LE (2002) A comparison of conventional and alternative cropping system using alfalfa (Medicago sativa) and winter wheat (Triticum aestivum): an agroecosystem analysis. MS thesis. The University of Georgia
Snook SK, Labosky Pl, Bowersox TW, Blankenhorn PR (1986) Pulp and paper making properties of a hybrid poplar clone grown under four management strategies and two soil sites. Wood Fiber Sci. 18(1):157–167
Taghiyari HR (2008) Evaluation of Juvenile Wood and Mature Wood Properties of Populus deltoides (69/55) and Populus euroamericana (cv. I-214) for Pulping Industry. PhD thesis. Tehran University. Department of Wood and Paper Science, Iran, p 95
Taghiyari HR, Efhami D (2011) Diameter increment response of Populus nigra var. betulifolia induced by alfalfa. Austrian J For Sci 128(2):113–127
Taghiyari HR, Efhami D, Karimi AN, Pourtahmasi K (2011) Effect of initial spacing on gas permeability of Populus nigra betulifolia. J Trop For Sci 23(3):305–310
Tisdal LS, Nelson LW (1974) Soil fertility & fertilizers, 3rd edn. Collier Macmillan, London, p 402
Wodzicki TJ (2001) Natural factors affecting wood structure. Wood Sci Tech 35:5–26
Zobel B (1992) Silvicultural effect on wood properties. IPEF International Piracicaba (2):31–38
Zobel BJ, Sprague JR (1998) Juvenile wood in forest trees. Springer-Heidelberg, New York
Zobel BJ, van Buijtenen JP (1989) Wood variation: its causes and control. Springer Series in Wood Science, Springer-Heidelberg
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This research was partially supported by Center of Excellency of Applied Management of Fast-Growing Wood Species of Iran. We also thank the Research Institute of Forests and Rangelands for facilities and support to carry out the field work.
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Communicated by R. Aloni.
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Efhami Sisi, D., Karimi, A.N., Pourtahmasi, K. et al. The effects of agroforestry practices on fiber attributes in Populus nigra var. betulifolia . Trees 26, 435–441 (2012). https://doi.org/10.1007/s00468-011-0604-4
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DOI: https://doi.org/10.1007/s00468-011-0604-4