九段沙中沙湿地植物磷元素的分布积累与动态

Distribution,Accumulation and Development of Element P in Middle Shoal Plants of Jiuduansha Wetlands

摘要:

对九段沙中沙湿地海三棱草、互花米草和芦苇3种典型湿地植物群落的植物各构件中磷(P)的分布、积累与动态进行研究.结果表明,3种湿地植物中磷含量存在很大差异,其大小排序为:海三棱草>芦苇>互花米草.磷在不同植物相同构件中的含量分布亦不同.3种湿地植物磷含量的季节动态规律有相似性,即随植物生长发育进程磷含量呈现逐渐降低的趋势,其中,茎秆中磷含量下降幅度最大,根中磷含量下降幅度最小.3种湿地植物磷含量的动态变化也存在差异,海三棱草各构件磷含量波动次数较少,互花米草和芦苇各构件磷含量波动次数则较多.植物中磷含量变化

Abstract:

This paper presents a reach on the distribution,accumulation and development of P in all components of three kinds of wetland plants,scirpus mariqueter,spartina alterniflora and phragmites australis in the middle shoal of the Yangtse River.The results show that P contents are different in three kinds of plants,and their content order from high to low is as follows:scirpus mariqueter>phragmites australis>spartina alterniflora.P contents are different even in the same components.However,the three kinds of plants share a similar seasonal development trend of P content:P content decreases gradually with the growing of plants,and the loss of P is the greatest in the stalk,but the least in the root.P contents change slightly in the components of scirpus mariqueter,but change a lot in spartina alterniflora and phragmites australis.The change of P content in the plant is closely related with the variation of different element content in the soil and water,and in the early growing stage related little with P content of soil and water.The closest correlation appears at different time for these three different plants,which indicates the plants absorb element P at different optimum time.