三江平原湿地小叶章群落磷素积累动态与生物量动态分析

采用野外定位观测结合室内分析的方法,对三江平原典型小叶章湿地两种类型小叶章生长季磷的积累及植物生物量的季节动态进行研究,以揭示三江平原湿地中磷在植物中积累的季节动态变化及其与植物生物量积累之间的关系,进一步认识磷在湿地系统中通过植物吸收迁移转化的机制。结果表明,两种小叶章群落地上、地下生物量以及植物体磷储量有明显的季节动态变化,但二者季节变化特征不同。此外,植物体地上、地下部分磷素积累量和生物量在整个植物体所占的比重两种类型也存在一定差异,这与植物所处的生境及其生态适应有一定关系。分析两种小叶章群落的生长速率(AGR)以及磷素的积累速率(Vp),表明在生长初期,磷是植物生长的重要营养元素。两种小叶章的AGR、Vp的变化曲线相似,说明对于这两种小叶章群落,生境不是磷积累速率的主要影响因素。

Dynamics of phosphorus and biomass accumulation of Calamagrostis angustifolia in Sanjiang Plain wetland

This paper studied the seasonal dynamics of phosphorus and biomass accumulation of two types Calamagrostis angustifolia in Sanjiang Plain wetland,aimed to explore the relationship between phosphorous uptake by the plants and their biomass accumulation,and to understand the characteristics of phosphorus accumulation and transference in wetland ecosystem.The results showed that for the two types of C.angustifolia,there was a distinct seasonal variation of aboveground and underground biomass and phosphorus accumulation,but the extent was differed with plant type,which should be related to the habitat condition and the physiological adaptability of the plants.Phosphorus was very important for the early growth of C.angustifolia,while habitat was not the main factor affecting phosphorus accumulation.