不同生境囊果苔草种群分蘖株的数量特征  

Quantitative characters of Carex physodesclonal population in different habitats of Testudo horsfieldinature reserve in Yili

作　　者：贾风勤[1] 金希堂 李紫薇[1] 张维[1] 

机构地区：[1]伊犁师范学院化学与生物科学学院,新疆伊犁835000 [2]霍城县科学技术局,新疆伊犁835000

出　　处：《西北农林科技大学学报（自然科学版）》2011年第4期205-210,共6页Journal of Northwest A&F University(Natural Science Edition)

基　　金：新疆维吾尔自治区自然科学基金项目(2009211A11)

摘　　要：【目的】研究伊犁四爪陆龟保护区不同生境下囊果苔草无性系种群分蘖株的年龄结构及其数量特征。【方法】通过野外采样、室内测定的方法,对坡顶、沟底和繁育区3种生境内囊果苔草各龄级分蘖株的数量、高度、生物量、生产力等数量性状进行系统分析。【结果】不同生境对囊果苔草营养分蘖株的年龄结构影响不明显。坡顶样地囊果苔草种群营养分蘖株由3个龄级组成,沟底样地和繁育区样地均由2个龄级组成,生殖分蘖株仅存在于繁育区且只有1龄级。3个样地中,分蘖株的数量、高度、生物量均以1龄株占明显优势,均为增长型年龄结构;平均单株生产力也以1龄株最高,并随龄级增加呈现不同程度下降。不同生境内囊果苔草种群营养分蘖株的数量特征呈现出较大程度的变异。【结论】3个样地中营养分蘖株的数量、高度、生物量和生产力均以1龄株占优势,均呈增长型年龄结构;1龄株以其较高的生产力和数量在种群中占据了主要地位。【Objective】 The research was to study age structure and other quantitative characters of Carex physodes clonal population in different habitats of Testudo horsfieldi nature reserve in Yili.【Method】 Based on field investigation and laboratory analysis,quantitative characters such as the number,height,biomass and productivity of C.physodes tillers on hill top,valley floor and in reproductive zone were studied.【Result】 The vegetative tillers consist of three age classes in hill top plots and two age classes in valley floor and reproductive zone respectively.The reproductive tillers have only one age class that is found only in reproductive plots.The age structure of the vegetative tillers shows no obvious difference in different habitats,and the one-year-old tillers have the largeset number,height and biomass.The quantitative characters show an increasing type of age structure in clonal population of C.physodes in different habitat.The one-year old tillers have the highest productivity among clones of all the three age classes,and with ages the productivity reduces gradually.There are large differences of quantaive characters of C.physodes clonal population in different habitats.【Conclusion】 The one-year old tillers are predominant in clonal populations of C.physodes in T.horsfieldi nature reserve with high productivity and large amount.

关 键 词：囊果苔草 分蘖株 生物量 年龄结构 

分 类 号：S543.901[农业科学—作物学]