干旱地区不同生境庭荠生物量的分布研究

Study on Biomass Distribution of Alyssum desertorum Under Different Habitats in Arid Area

采用野外生态学试验和室内分析方法相结合,分析了3种不同生境内短命植物庭荠种群的生物量特征。结果表明:庭荠种群株高、各器官生物量和总生物量在不同生境间显著差异,且多数变异系数高于70%,以林地植株数量性状变异最大;在不同生境内根和茎生物量随总生物量增加均呈幂函数形式增长,表现为相似的异速生长规律,茎生物量的增长速率(b茎生物量=1.153 4)最高,叶和果实生物量分别呈幂函数或线形增长,果实生物量随根、茎和叶生物量变化趋势表现为幂函数和线性增长关系;庭荠植株生物量和生长情况在样地内和样地间受随机环境因子和自身遗传因子的内外调控而表现出一定的异同点。

Based on field investigation and laboratory analysis, biomass characteristic of an ephemeral plant Alyssum desertorum in 3 habitats was compared. The results indicated that height, modules biomass and total biomass of plant within each habitat were significantly different, and coefficients of variation of lots of component were more than 70%. Biomass of root and stem increased in a power function with increasing of total biomass, and showed a similar power allometry growth pattern, and the fastest growth rate was showed on the stem biomass （b=1.1534） in nature reserve plot. Meanwhile, there was a positive power function or a linear relationship between leaf and fruit biomass with total biomass, the similar pattern was observed in the relationship between fruit biomass and root biomass, stem biomass and leaf biomass. For A.desertorum populations, biomass component and growth situation can be similar or different both within and between habitat, which is controlled by the interaction between environmental and genetic factors.