Growth and biomass allocation of differently-aged populations of Spartina alterniflora
Growth and biomass allocation of differently-aged populations of Spartina alterniflora
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作者：
Wang Yu
采用“时空梯度”方法对互花米草不同年龄种群的生长和生物量分配进行了研究。结果表明:互花米草种群的身高增长随着种群年龄的增加呈下降趋势,其中6、16龄种群的身高增长显着低于2龄种群(P<0。05);种群密度、总生物量和地上生物量随着种群的增加而降低。年龄方面,16龄群体与2龄群体差异显着(P<0。05);地下生物量和根冠比先几年增加,后降低,16龄群体地下生物量显着低于2龄群体(P<0。05);同化有机生物量不随群体年龄的变化而变化,非同化有机生物量随群体年龄的增加而减少,6岁群体和2龄群体的非同化有机生物量随着群体年龄的增加而减少。 16年生种群显着低于2年生种群(P<0。05);须根和根茎生物量前几年增加,随后减少。所有结果表明互花米草16年生种群呈现下降趋势,深入了解其下降原因有助于我国互花米草的管控。
Growth and biomass allocation of differently-aged populations of Spartina alterniflora were studied by methodology of "spatial for temporal gradient".The results showed that:the height growth of Spartina alterniflora populations presented a downward trend with the increase of population age,and the height growth of 6 and 16 years old populations were significantly lower than that of 2 years old population(P0.05);the density,total biomass and above-ground biomass of populations decreased with the increase of population age,with significant difference between those of 16 and 2 years old populations(P0.05);the below-ground biomass and root-shoot ratio increased in the first few years followed with reducing thenafter,and the below-ground biomass of 16 years old population was significantly lower than that of 2 years old population(P0.05);the assimilative organic biomass didn't change with population age,while non-assimilative organic biomass reduced with increase of population age with those of 6 and 16 years old populations being significantly lower than that of 2 years old population(P0.05);the fibrous roots and rhizome biomass increased in the first few years followed with reducing.All the results indicated that the 16 years old population of Spartina alterniflora presented a declining trend and more understanding of the declining reasons will be helpful to the management and control of Spartina alterniflora in China.