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作 者 ：王丽学,程积民*,万惠娥,周梦华,赵凌平,李维军,石绘陆

期 刊 ：生态学报 2008年 28卷 7期 页码：3168~3175

关键词：天然草地；株高；地上单株生物量；Logistic模型；动态分形；降雨量；

Keywords:nature grassland, plant height, individual aboveground biomass, Logistic model, dynamic fraction, precipitation,

摘 要 ：试验以云雾山优势种本氏针茅（Stipa bungeana）、大针茅（Stipa grandis）与伴生种百里香（Thymus mongolicus）、铁杆蒿（Artemisia sacrorum）、厚穗冰草（Agropyron dasystachys）、二裂萎陵菜（Potentilla bifurca）和阿尔泰狗娃花（Heteropappus altaicus）为研究对象，对每一植物选择典型植株进行标记，重点从植物株高和地上单株生物量两个方面对其生长动态，进行一个生长周期（返青期-枯黄期）的观察测量，结果表明：(1）植物生长在株高和地上单株生物量达到最大值之前，均基本符合Logistic生长模型；(2）在植物整个生长过程中，地上单株生物量月变化与株高存在动态分形关系：lnB=D×lnH+lnC。(3）植物生长除受其生物学特性支配外还受外界环境因子的限制，在干旱半干旱地区，降雨量显得尤为重要，在本次试验中，植物株高增长和地上单株生物量月变化均与降雨量累积存在着极显著的对数相关性：y=a×lnx+b。

Abstract:The study was conducted by selecting the typical plant of the following dominant species of Stipa bungeana, S. (grandis and companion species including Thymus mongolicus, Artemisia sacrorum, Agropyron dasystachys, Potentilla bifurca, Heteropappus altaicus, and by tagging selected plants in theYunwu Mountain. The growth dynamic of the plants from plant height and individual aboveground biomass during its growth cycle (from recovering to withering stage) were observed and measured. The results showed that: (1) The growth of the plants is basically coincident with Logistic models before the height and individual aboveground biomass reaches to the maximum; (2) There is a dynamic fractal relationship between plant individual aboveground biomass and plant height. The function as follows：lnB=D×lnH+lnC; (3) The growth of the plants was not only affected by their biological characteristics, but also by environmental factors, in which precipitation is more important in arid and semi-arid region. In this experiment both the growth of plant height and the monthly variation of individual aboveground biomass have a significantly logarithm correlation with precipitation accumulation as the function of y=a×lnx+b.

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