福建罗源湾海滩互花米草盐沼中氮、磷、钾元素分布的研究

互花米草引种到福建罗源湾两年后,使海滩盐沼土有机质提高35—44%,含N量提高80%左右,总P和总K没有多大变化,速效P含量降低3.5—7%。在互花米草盐沼生态系统中,不同相中的N、P、K元素分布量的关系是:植物〉土壤〉海水。10月中旬采样测试表明,互花米草的含N量,地上部分高于地下部分;含P及含K量则相反。在对N、P、K的吸收、分布方面,三个生态型差异不显著。

DISTRIBUTION OF N,P,K IN SALT MARSH OF SPARTINA ALTERN1FLORA IN TIDAL LAND LUOYUAN, FUJIAN

Since Spartina alterniflora was transplanted in the estuary Luoyuan, Province Fujian, organic matter content has increased 35-40%, N content 80%, effective P content decreased 3.5-7%, total P and total K remained the same in the salt marsh soit. In the salt marsh ecosystem the relationship of N, P, K distributed in different phases was: plant>sediment> sea water. The leaves and shoots of Spartina alterniflora taken in October were richer in N content but poorer in P and K content than the roots, there was not significant difference in their absorption and distribution in three ecotypes.