摘要
以太湖底泥为研究对象,通过分析不同形态N、P的含量,揭示太湖北部底泥N、P的区域和垂向变化特征,探讨了主要营养元素的环境意义。太湖北部底泥N、P的高值区分布在五里湖、梅梁湾北部和竺山湖北部,有效氮的分布与总氮的分布一致。相关分析表明,有效磷与无机磷具有很好的正相关性,N、P的含量还与粘土矿物的含量成正比。柱状样的N、P垂直变化显示,数千年人类的活动并未明显影响底泥中N、P的含量,而在近代则明显增加。底泥中大量的N、P主要来自生活污水,其次是农田肥料和围网养殖。
Based on analyses of nitrogen and phosphorus, their horizontal and vertical characteristics of bottom sediments in northern Taihu Lake are discussed. Their environmental implications are also studied. The high values of N and P are distributed in Wuli Lake, northern Meiliang Bay and northern Zhushan Lake. The distribution of effective nitrogen is consistent with that of total nitrogen. The value of effective phosphorus is good related to that of inorganic phosphorus, which indirectly shows that the former mainly originated from the latter. There is a positive correlation between the contents of N, P and those of clay mineral. It is shown that there was little change of the concentration of N and P during past thousands according to analytic results of core samples. The obvious accumulation of N and P began five hundred years ago. A great number of N and P in bottom sediments resulted from living sewage, agricultural fertilizer and fish nourishment. From 1960,the content of N and P rose until at its peak value in the middle 1990s based on some records. Fortunately we can observe the descent trend of nutriments in sediments during the recently years.
出处
《地球化学》
CAS
CSCD
北大核心
2002年第4期321-328,共8页
Geochimica
基金
江苏省自然科学重点基金(BK99005)
关键词
底泥
氮
磷
环境意义
太湖
分布
人类活动
bottom sediment
nitrogen
phosphorus
environmental implication
Taihu Lake
