海水双壳贝类的N、P排泄及其生态效应

Nitrogen and phosphorus excretions by marine bivalves and the ecological effects

在双壳贝类的氮(N)排泄中,尽管NH4+-N含量占主导地位,但氨基酸含量占据着相当可观的比例,其他形态的N,如尿素、亚硝酸盐和硝酸盐也有检出,但比例不大。在双壳贝类磷(P)排泄中,有机磷含量约占总溶解磷排泄的1/3。双壳贝类N、P排泄在沿岸生态系统的营养动力学中起着重要的作用。尤其是对于我国高密度的沿岸贝类养殖海区,双壳贝类N、P排泄对养殖海区的营养循环可能产生显著的影响。

NH4+N is the predominant nitrogenous excretory product by marine bivalves. However, besides that, amino acids are another significant nitrogenous component. Organic phosphorus constitutes about 1/3 of the total phosphorus content excreted by the bivalves. The N and P excretions by sea bivalves especially by the raftculture may have great effects on the nutrient cycling in coastal ecosystem. The prupose of this review is to provide some research information on N and P excretions by marine bivalves cultured in China.