摘要
根据2008年春季(5月)和夏季(8月)在舟山附近海域调查监测资料,采用改良后的营养指数法,结合N/P(物质的量比)潜在性富营养化法,对该海域在春季和夏季的富营养化水平进行了评价,并分析了该海域富营养化的时空分布特征,对富营养化指数与环境因子的相关关系进行了讨论,同时对两种方法的结果进行了比较分析。营养指数法计算结果显示:舟山附近海域的富营养化程度较低,各调查站位富营养化指数均小于富营养化阀值;春季的富营养化水平高于夏季;春季、夏季富营养化指数的平面分布均表现出沿岸到离岸方向呈逐渐降低的特点;春季调查海域N/P平均值为17.35,略高于Redfield系数,夏季N/P平均值为56.34,具有明显的营养盐比例不平衡的特征。潜在性富营养化法计算结果显示:春季属于富营养水平,夏季属于磷限制潜在性富营养;富营养化指数与盐度、溶解氧、pH相关性均不显著,调查海域富营养化水平的时空变化主要受地表径流冲谈水、浮游植物、外海海流等的共同影响。
Based on the survey data of Zhoushan sea area in spring（May）and summer（August）2008,and by using modified nutrient status index in combining with the assessment method of potential eutrophication（N/P mass ratio）,the eutrophication level of the sea area in spring and summer was assessed,with the spatiotemporal distribution of the eutrophication and the relationships between eutrophication index and environmental factors analyzed.Meanwhile,the assessment results of using nutrient status index and N/P mass ratio were compared.The results based on nutrient status index showed that the Zhoushan sea area had a lower eutrophication level,and the values of the eutrophication index at the stations surveyed were all lower than the thresholds of corresponding N/P mass ratios.The eutrophication level was higher in spring than in summer.The eutrophication index decreased from the alongshore to the open sea.In spring,the mean N/P mass ratio of the sea area was 17.35,being higher than Redfield value;in summer,this mass ratio was 56.34,with the characteristics of obvious imbalance in the nutrients ratio.The results based on N/P mass ratio indicated that spring could be the season of N-limited potential eutrophication,while summer could be the season of P-limited potential eutrophication.No significant correlations were observed between the eutrophication index and the water salinity,dissolved oxygen,and pH.The spatiotemporal distribution of the eutrophication in the sea area was mainly co-effected by the ground surface runoff,phytoplankton,and ocean current of open sea.
出处
《生态学杂志》
CAS
CSCD
北大核心
2011年第4期771-777,共7页
Chinese Journal of Ecology
基金
国家重点基础研究发展计划项目(2010CB429005)资助
关键词
舟山附近海域
营养盐
富营养化
时空分布
环境因子
Zhoushan sea area
nutrient
eutrophication
spatiotemporal distribution
environmental factor
作者简介
作者简介李磊，1985年生，男，硕士研究生。研究方向为海洋生态学。E—mail：zheyilee@126．com
通讯作者E—mail：xinqiang_shen@hotmail．com
