[Altitude-belt zonality of wood vegetation within mountainous regions of the Sayan Mountains: a model of ecological second-order phase transitions ].

IF 0.3 4区 生物学 Q4 BIOLOGY Zhurnal obshchei biologii Pub Date : 2014-01-01
V G Sukhovol'skiĭ, T M Ovchinnikova, S D Baboĭ
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Abstract

As a description of altitude-belt zonality of wood vegetation, a model of ecological second-order transitions is proposed. Objects of the study have been chosen to be forest cenoses of the northern slope of Kulumyss Ridge (the Sayan Mauntains), while the results are comprised by the altitude profiles of wood vegetation. An ecological phase transition can be considered as the transition of cenoses at different altitudes from the state of presence of certain tree species within the studied territory to the state of their absence. By analogy with the physical model of second-order, phase transitions the order parameter is introduced (i.e., the area portion occupied by a single tree species at the certain altitude) as well as the control variable (i.e., the altitude of the wood vegetation belt). As the formal relation between them, an analog of the Landau's equation for phase transitions in physical systems is obtained. It is shown that the model is in a good accordance with the empirical data. Thus, the model can be used for estimation of upper and lower boundaries of altitude belts for individual tree species (like birch, aspen, Siberian fir, Siberian pine) as well as the breadth of their ecological niches with regard to altitude. The model includes also the parameters that describe numerically the interactions between different species of wood vegetation. The approach versatility allows to simplify description and modeling of wood vegetation altitude zonality, and enables assessment of vegetation cenoses response to climatic changes.

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[萨颜山山区林木植被高程带地带性:一个生态二级相变模型]。
为了描述林木植被的高带地带性,提出了生态二级过渡模型。研究对象选择Kulumyss岭北坡(萨彦山)的森林植被,结果由木本植被的海拔剖面组成。生态相变可以被认为是不同海拔的植被从研究区域内某些树种的存在状态到没有这些树种的状态的过渡。通过类比二阶物理模型,引入了阶参量(即某一海拔高度单一树种所占的面积比例)和控制变量(即木植被带海拔高度)的相变。作为它们之间的形式关系,得到了物理系统相变的朗道方程的类比。结果表明,该模型与实际数据吻合较好。因此,该模型可用于估算桦树、白杨、西伯利亚冷杉、西伯利亚松等树种海拔带的上、下边界及其生态位宽度随海拔的变化。该模型还包括数值描述不同树种间相互作用的参数。该方法的多功能性可以简化木植被高度地带性的描述和建模,并可以评估植被对气候变化的响应。
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来源期刊
Zhurnal obshchei biologii
Zhurnal obshchei biologii 生物-生物学
自引率
25.00%
发文量
6
审稿时长
>12 weeks
期刊介绍: Публикуются статьи по теоретическим вопросам биологии, представляющие интерес для биологов любой специальности (вопросы эволюции, экологии, общей таксономии, общей цитологии, генетики, проблемы механизмов приспособления живых организмов к условиям существования, закономерности развития организмов, бионика и т. д.), основанные на новом оригинальном фактическом материале или же подводящие итоги работы того или иного научного коллектива. Помимо теоретических статей, помещаются рецензии на новые книги российских и зарубежных биологов, а также информация о международных конгрессах и общероссийских совещаниях по важнейшим проблемам биологии.
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