摘要
粗柄独尾草(Eremurus inderiensis)是古尔班通古特沙漠特有类短命植物。采用全株挖掘法研究粗柄独尾草盛花期的生物学特征、器官生物量分配及生物量估测模型。结果表明:粗柄独尾草地上形态指标之间及其与器官生物量间均呈显著正相关,协同生长关系较强。粗柄独尾草地下生物量平均为(12.00±5.85)g/株,占全株58.23%±6.07%,地上生物量平均为(9.15±5.75)g/株,占全株41.77%±6.07%,根冠比为1.44±0.34。根生物量所占比例最大(51.61%±5.93%),其次为有性繁殖器官(25.14%±5.02%)和光合器官(16.63%±3.75%),这种分配模式体现了类短命植物生活型的特点。根冠比与地上形态指标间均为负相关关系。叶片、花序、地上及地下生物量间的相关生长分析表明,仅叶片重与地上生物量、叶片重与花序生物量间呈等速生长关系,其他均为异速关系。基于D(花柄基径)、HD2(H为株高)的地上、地下和总生物量直接估测模型均较为精确,且地下生物量的直接和间接估测(基于异速关系)效果相同。
Eremurus inderiensis is a unique ephemeroid species in the Gurbantunggut Desert in China.In this paper,the aboveground biological characteristics,biomass allocation and biomass estimation were studied using the whole-plant excavation.The results show that there were the significant positive correlations between the aboveground morphological indicators and organ biomasses of E.inderiensis,showing an evidently collaborative growth relationship.The mean belowground biomass of E.inderiensis was（12.00±5.85） g per individual,which occupied 58.23%±6.07% of the total biomass;while the mean aboveground biomass was（9.15±5.75） g per individual,41.77%±6.07% of the total biomass,and the root-shoot ratio（R/S） was 1.44 ± 0.34.The root（51.61%±5.93% of the total biomass） occupied the most of the total biomass,the next two were sexual reproduction organ（25.14%±5.02%） and photosynthetic organ（16.63%±3.75%）,and this allocation pattern reflected the life-form characters of ephemeroid plant.The R/S and the aboveground morphological indicators were negatively correlated.The allometric analysis between leaf biomass,inflorescence biomass,above-and belowground biomass revealed that there were the isometric relationships only between leaves and aboveground biomass and between leaves and inflorescence biomass,but the allometric ones between others.Based on D and HD2,the accuracy of above-and belowground biomasses and total biomass estimated with the direct estimation models was high,and that of belowground biomass estimated with the direct and indirect（based on allometric relationship） estimation models was also high.
出处
《干旱区研究》
CSCD
北大核心
2012年第1期93-100,共8页
Arid Zone Research
基金
国家重点基础研究发展计划项目(2009CB825104)
