阔叶红松林下早春植物生物量分配

Biomass allocation of eight early-spring herbs in broadleaf-Pinus koraiensis mixed forest

为探索早春植物对于早春环境是否具有相似的生活史类型,对蛟河实验管理局阔叶红松林样地1年内8种常见早春植物进行了4次调查,采用全收获法获取早春植物生物量并每隔2 d观察1次物候,对样地内早春植物各器官生物量分配的季节动态及其种间差异进行了初步分析,构建了株高与生物量的线性回归模型。结果表明:8种早春植物的开花、结果历程总体相差较大,但花果期普遍较短(34~48 d)。8种早春植物在生长过程中各器官生物量差异均达到极显著水平(P<0.01),8种早春植物总生物量(0.1~4.0 g)和株高(7~23 cm)普遍较小,各早春植物在自身总生物量和株高变化上总体呈现出相同的变化趋势。8种早春植物在相同日期根冠比和生殖分配比差异均达到极显著水平(P<0.01),同一早春植物在不同日期根冠比和生殖分配比差异也均达到极显著水平(P<0.01),生殖分配总体维持在较低水平(<13%)。8种早春植物在生长过程中总生物量向地下生物量的分配比例明显提高。以株高为自变量,构建8种早春植物总生物量5种线性回归模型,模型验证结果显示菟葵的拟合效果最好,其他7种早春植物平均相对误差绝对值(RMA)较大,但总体与建模标准相符。由此推测,早春植物在生物量分配方面具有相似的生活史策略。

To investigate whether early-spring herbs（ ESHs） have a similar life-spancy pattern,we observed seasonal dynamics and inter-specific differences of biomass for eight common ESHs in plots of broadleafKorean pine（ Pinus koraiensis） mixed forests,located in the experimental forests of Jiaohe Forestry Administration,northeastern China. The measurements were conducted 4 times in a year with the full harvest method,and phenology was observed every 2 days. Linear regression models between biomass and plant height were fitted. The results showed the course of flowering and fruiting among the eight ESHs were much different,ranging from 34 to 48 days. The biomass of various organs among the eight ESHs differed significantly. In addition,total biomass varied between 0. 1 and 4 g,and plant height between 7and 23 cm. ESHs presented a similar trend in the change of biomass and height. The root-top ratio as well as reproductive allocation ratio by the same date among the eight ESHs were significantly different,the root-top ratio as well as the reproductive allocation ratio by different dates among the same ESHs were also significantly different, with the overall reproductive allocation remained less than 13%. The proportion of the underground biomass was significantly increased throughout the growing season. We fitted five linear regression equations of total biomass to plant height for the eight ESHs. The results indicated that Eranthis stellata had the best fitting. Although the RMA of other seven ESHs was large,but it was still consistent with the modeling standards. So it is concluded that ESHs have the same life strategy in biomass allocation.