【摘要】 比较分析了科尔沁沙地70种草本植物盛花期时的个体和构件生物量特性。结果表明:43种植物个体生物量小于5.0 g,大部分物种根、茎、叶、花等构件的生物量均小于2.0 g,62种植物的根冠比小于1,说明70种草本植物中的大部分物种以地上生物量为主,只有少数物种具有较发达的地下根系。植物各构件生物量之间呈显著正相关,对个体生物量的贡献率为:茎>叶>根>花。多年生和1~2年生物种的个体生物量以及各构件生物量均无显著差异,但1~2年生物种的茎和地上生物量对个体生物量的贡献率显著高于多年生物种,而多年生物种的地下生物量对个体生物量的贡献率显著高于1~2年生物种,不同构件对生物量贡献率的差异有利于不同生活型植物的种群扩散和繁衍。更多还原

【Abstract】 In this study,the individual biomass and modular biomass of 70 herbaceous species in the Horqin Sandy Land were compared.The results showed that the individual biomass of 43 of the 70 species was less than 5.0 g,that the modular(root,stem,leaf and flower) biomass of most of the species was less than 2.0 g,and that the root-shoot ratios of 62 species was less than 1.These results indicate that the individual biomass of most species comes from aboveground biomass,and that just a few species have more branching roots and lateral roots.There is also a significant positive correlation between modular biomasses and the ratios of the modular biomass/individual biomass occur in an order of stem > leaf > root > flower.There was no significant difference in the individual and modular biomass between annual or biennial species and perennial species.The ratios of stem biomass/individual biomass and aboveground biomass/individual biomass of annual or biennial species were significantly higher than those of perennial species,but the ratio of root biomass/individual biomass of perennial species was significantly higher than that of annual or biennial species.These characteristics are advantageous for the population diffusion and growth of different life-forms.The results also revealed that the arid climate and lean soil in the Horqin Sandy Land restrict the growth of plants,so the energy of most herbaceous species is utilized for growing their stems and leaves.更多还原