江苏海岸带陆生盐土植物矿质元素含量的特点及生物循环

陆生盐土植物在生长过程中吸收积累了大量的Cl和Na;从海向陆随着土壤和植被的生态演替,植物中Cl和Na的浓度逐渐降低;N与Cl、Na有相似的水平分布规律;植物种类是影响元素吸收积累的主要因素。在盐地碱蓬中N、P、K、Ca、Mg、Na、Cl、Mn和Zn的含量均是生长前期较高,随着其生长老化逐渐降低,大穗结缕草、白茅与盐地碱蓬相比,Ca的含量前期低后期高,Na、Mn、Cu和Zn的季节变化不明显。参加盐地碱蓬系统生物循环的元素中,Cl和Na的比例最大,在大穗结缕草和白茅生态系统中比例较小;由于白茅被收割利用,一些元素从此生态系统中流失。

The concentration characteristics of mineral elements and biological cycle in the terrestrial solonchak plants on the beach of Jiangsu Province

A large number of Cl and Na was absorbed and accumulated in the terrestrial solonchak plants among their growth process, following the ecological succession of soil and vegetation from the sea towards the continent, the concentrations of Cl and Na in plants decrease gradually, the hirizontal distribution law of element N is similar with Cl and Na and specific difference is the main cause of affecting the absorption and accumulation of various elements. Elements N, P, K, Ca, Mg, Na, Cl, Mn, Cu and Zn in Suaeda salsa are higher in the early growth stage, with the plant glowing and ageing the concentrations of these elements decrease gradually. In Zoysia macrostachys and Imperata cylindrica var. major, the seasonal changes of elements Na, Mn, Cu, and Zn are not clear, and the content of element Ca is higher in the later growth stage. The elemental biological cycle within the ecosystem of Suaeda salsa, the content proportion of Cl and Na is the highest, but within the ecosystem of Zoysia macrostachgs and Imperata cytaidrica var. major the concentration proprtion of Cl and Na is lower. Because Imperata cylindrica var. major is harvested and utilized, so some elements were lost from this ecosystem.