沼生植物过渡金属元素含量季节变化特征——以三江平原典型湿地植物为例

三江平原沼泽湿地生态系统不同水文条件下(高、中、低位区),同种植物和不同植物不同器官中过渡金属元素Fe、Mn、Zn、Cu含量季节变化规律基本相似,亦表现出一定的时间分配差异。高、中和低位区小叶章茎、叶、根中Fe含量季节变化规律为幼苗时期最高,成熟后含量减少(高位区根除外);高、中和低位区茎、叶中Mn含量随季节分配趋势是先减少后增加,而根中Mn含量变化较复杂;高、中和低位区茎、叶和根中Zn含量随季节变化呈初期含量高,后期含量低(低位区茎、根除外)的趋势,而中期变化复杂;各区植物茎、叶和根中Cu含量基本呈随时间变化含量逐渐下降,高位区根和低位区的叶含量变化趋势较特殊;从元素含量水平比较,高、中小叶章和低位区毛果苔草表现为茎、叶Mn含量>Fe含量,根中Fe>Mn;茎、叶、根中Zn>Cu。

Characteristic of Seasonal Variation of Transition Metal Elements Content in Paludine Plant--A Case Study of Typical Wetland Plant in the Sanjing Plain

Under different hydrological conditions in wetland ecosystems in the Sanjiang Plain, the seasonal variation of the transition metal element Fe,Mn,Zu,Cu is general resemble in different organs of the same and different kinds of plants, and at the same time it shows a seasonal content difference to some extent. The content of Fe in root, stem and leaf of Calamagrostis angustifolia in upper, middle and lower land reaches the acme in the seedling, and reduces after it matures except in the upper land. The content of Mn in Calamagrostis angustifolia reduces in the seedling period and then increases seasonally, and the variation in root is complicated. The content of Zn is high in the seedling and becomes low in the mature period except in stem and root of the lower land, and the variation trend is complexity. The Cu content in root, stem and leaf in all sites reduces with time, and the trend of root in high land and leaf in the lower land is different. The order of element content in different organs of these plants is Mn >Fe in stem and leaf, Fe >Mn in root; Zn>Cu in root, stem and leaf.