不同植物当年生枝叶随时间变化生物量分配和水分含量变动策略

The Strategy of Biomass Allocation and Water Content Variation in Current-year Branch and Leaf of Different Plant Species over Time

通过连续3个月(6-8月)对9种植物当年生枝叶生物量和水分含量及其相对比例、总叶面积和比叶面积等指标进行比较,分析随时间变化植物当年生枝叶生物量分配和水分含量的变化情况。结果表明,不同植物当年生枝条和叶片形态变化差异显著(P<0.05),在枝叶之间生物量分配比和水分含量比表现出枝条越长,植物个体在枝条和叶片上生物量分配和水分含量差距越小的趋势,反之,则表现为枝条越短,相对比例差距越大的趋势;随时间变化,不同植物当年生枝条、叶片在生物量分配、水分含量及相对比例、总叶面积、比叶面积主要分为4种增长类型:6-8月均无显著差异;7月显著增加(P<0.05);8月显著增加(P<0.05);6-8月逐月显著增加(P<0.05)。可以认为,随时间变化不同植物枝条和叶片的生物量投入和水分保持以及枝条与叶片之间的物质分配权衡关系都在不断发生变化,同时表现出一定的规律性。

According to contrast biomass allocation,water content and their relative proportion,total leaf area and specific leaf area in current-year branch and leaf of 9 plant species in three continuous months(June-August),we analyzed the variation of their biomass allocation and water content over time.The results showed that there was a significant difference change in the morphology of each plant’branch and leaf(P<0.05).The longer branch length grew,the smaller biomass allocation ratio and water content ratio between branch and leaf they were,and vice versa.We summarized four growth types,which presented biomass allocation,water content and their relative proportion,total leaf area and specific leaf area in current-year branch and leaf over time,there was no significant difference from June to August;there was a significant growth started from July(P<0.05);there was a significant growth started from August(P<0.05);each month had a significant growth(P<0.05).We concluded that biomass investment and water retention of branch and leaf in different plant species,and the trade-off between branch and leaf all changed over time,which showed the regularity of themselves.