摘要
南黄海不同粒度表层沉积物中可转化氮的形成与释放受环境因子的驱动作用各不相同 ,上覆水体的温度、盐度、pH值、DO的含量以及NH+4和NO-3 的含量都对其有一定的影响 .其中DO是不同形态的氮形成与释放最显著的影响因素 ,这是因为上覆水体中DO的含量愈高 ,扩散进入表层沉积物中的O2 就愈多 ,沉积物处于相对氧化的环境中 ,有机质的矿化作用较易进行 ,致使无机形态氮的含量相对较高 ,而有机形态氮的含量相对较低 ,所以其与可转化有机形态氮呈负相关 ,而与可转化无机形态氮呈正相关 .温度与中、细粒度沉积物中的SOEF N的含量呈显著正相关 ,可能是因为温度的升高加快了海洋底栖生物的生长发育 ,使生物排泄物和死亡残体增多 ,尽管温度的升高加快了沉积物中有机质的矿化分解 ,但由于中、细粒度沉积物堆积紧密 ,对温度的响应不明显 ,致使SOEF N的含量随温度的升高而升高 .上覆水体中的NH+4和NO-3 分别与中、细粒度沉积物中的SAEF N和SOEF N的含量呈正相关 ,说明上覆水体中的NH+4和NO-3 主要来自于沉积物中SAEF N和SOEF N的形成与释放 .另外 ,粗粒度沉积物中不同形态的氮对环境的响应较中、细粒度沉积物中的强 .
The formation and release of different forms of transferable nitrogen in different grain size surface sediments of the southern yellow sea were affected differently by circumstance.DO was the predominant factor to affect the transferable nitrogen formation and release because that the diffused O 2 content was higher if the DO content of overlying water high,so the sediment was in oxidative conditions and the mineralization of organisms was easily processed,which resulted in the contert of inorganic nitrogen was higher and that of organic nitrogen was lower.Temperature of overlying water was positively relative with the content of SOEF-N in medium and fine-sized sediments.Higher temperature could accelerate the benthos growth,which caused the biological egesta and organic detritus increased,in addition medium and fine-sized sediments accumulated tightly and the organism was not sensitive to temperature though temperature increasing could accelerate organisms decompo- sing ,so SOEF-N content in creased.The NH + 4 and NO - 3 contents of overlying water had positive relationship with the contents of SAEF-N and SOEF-N in medium and fine-sized sediments,which indicated that the NH + 4 and NO - 3 mainly came from the release of SAEF-N and SOEF-N in sediments.The different forms of nitrogen in coarse sediments were more sensitive to environment than that in medium and fine-sized sediments
出处
《环境化学》
CAS
CSCD
北大核心
2004年第3期314-320,共7页
Environmental Chemistry
基金
国家杰出青年科学基金 ( 4 992 5 61 4)
中国科学院知识创新重大项目 (KZCX1 SW 0 1 0 8) (KZCX1 SW 0 1 1 7)
中国科学院百人计划资助项目
