阿拉善荒漠绵刺克隆生长格局研究

绵刺在不同环境胁迫下 (干旱、盐碱化、贫瘠化和随机干扰 )所形成的独特构型特征 ,即克隆性 ,是了解绵刺生态适应性的关键 .绵刺的克隆性是由根部劈裂形成间隔物较短的密集型克隆生长构型及枝条自然压枝形成间隔物较长的游击型克隆生长构型所构成 .该文对绵刺两种克隆生长构型的分枝数目、分枝角度和分枝强度等克隆格局参数进行绵刺克隆生长格局研究 ,并结合绵刺种群格局分析 ,指出绵刺克隆格局在绵刺生存对策中所表现的对异质性资源响应的方式 ,这种响应方式在克隆生长构型改变、风险分摊、营养扩散和种群增长过程等方面表现出极大的可塑性 ,从而表明绵刺对环境具有极强的适应性 .

Structure of clone growth of a rare and endangered plant Potaninia mongolica Maxim. in Alashan desert, Inner Mongolia

The distinctive architectural features of \%Potaninia mongolica\% Maxim. formed under different environmental stresses, referred to as the clone character, are the crux to understand its ecological adaptability. The clone growth of \%P.mongolica\% Maxim. is made up of two patterns, the phalanx pattern and the guerrilla pattern. The former is composed of cleft root and the latter is made up of long dropping branches. By studying on several parameters, such as the branching number, the branching angle and the intensity of branch, the two clone growth patterns of \%P.mongolica\% Maxim. are discussed. Moreover, with the analysis of spatial pattern, this paper points out the responding way to heterogeneous resources performed by \%P.mongolica\% Maxim. during its survival strategy, which shows great plasticity as to he pattern change, risk\|spreading, nutrition\|diffuse and community increase. The research also manifests that \%P.mongolica\% Maxim. has great adaptability to the diversified environment.