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    Southern Cross University
    European Forest Institute Mediterranean Office (EFIMED)

    Stand biomass dynamic of pine plantations and natural forest on dry steppe in Kazakhstan

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    Biomass dynamics were studied in isolated relict stands of Scots pine (Pinus sylvestris L.) on the dry steppe of Kazakhstan (5354- N), where potential evaporation is 500600 mm yr-1 and the rainfall is 250260 mm yr-1. Samples were taken from seven plots in natural stands on sandy forest soils (aged 13110 yrs) and ten plots in plantations on dark-chestnut-coloured soils (aged 550 yrs). Nine or ten sample trees were taken from each plot, giving a total of 68 and 96 sample trees in natural and plantation stands respectively. Root systems were excavated and fractionated in 11 plots. Analyses indicated that the stability of these stands becomes critical at 1020 yrs, when foliage biomass reaches its maximum (713 t ha-1 dry weight), both in plantations and natural stands. Self-regulating mechanisms in natural stands provide stability that may not develop in some plantations. Natural stands may show an abrupt decrease in foliage biomass at the time of canopy closure, but it increases again by age 4050 yrs. In plantations this critical period may cause die-back and may trigger stand collapse before maturity. Stem and root biomass increases monotonically and does not depend upon stand origin. The total biomass production is influenced by ground water level and the presence of and depth to the clay layer underlying the sandy sediments

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    Description

    Title : Stand biomass dynamic of pine plantations and natural forest on dry steppe in Kazakhstan
    Author(s) : Usol, Rsquo, V A Tsev, J K Vanclay
    Abstract : Biomass dynamics were studied in isolated relict stands of Scots pine (Pinus sylvestris L.) on the dry steppe of Kazakhstan (5354- N), where potential evaporation is 500600 mm yr-1 and the rainfall is 250260 mm yr-1. Samples were taken from seven plots in natural stands on sandy forest soils (aged 13110 yrs) and ten plots in plantations on dark-chestnut-coloured soils (aged 550 yrs). Nine or ten sample trees were taken from each plot, giving a total of 68 and 96 sample trees in natural and plantation stands respectively. Root systems were excavated and fractionated in 11 plots. Analyses indicated that the stability of these stands becomes critical at 1020 yrs, when foliage biomass reaches its maximum (713 t ha-1 dry weight), both in plantations and natural stands. Self-regulating mechanisms in natural stands provide stability that may not develop in some plantations. Natural stands may show an abrupt decrease in foliage biomass at the time of canopy closure, but it increases again by age 4050 yrs. In plantations this critical period may cause die-back and may trigger stand collapse before maturity. Stem and root biomass increases monotonically and does not depend upon stand origin. The total biomass production is influenced by ground water level and the presence of and depth to the clay layer underlying the sandy sediments
    Keywords : critical growth period, pinus sylvestris, resiliance, stability

    Subject : unspecified
    Area : Other
    Language : English
    Year : 1995

    Affiliations Southern Cross University
    Journal : Scandinavian Journal of Forest Research
    Volume : 10
    Issue : 1
    Publisher : Taylor & Francis
    Pages : 305-312
    Url : http://www.informaworld.com/10.1080/02827589509382897

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    Jerome's Peer Evaluation activity

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    • Habiba Hassan Wassef, Senior professional, Independent international expert, United Nations, WHO, National Coordinator for the 7th European Framework Research Programme, National Research Center in Cairo, Egypt.
    • Thuy Nguyen, Student, Ph.D. Level, Silviculture Research Institute, Ha Noi, Vietnam, The University of Melbourne.
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