大鹏澳海湾养殖生态环境的化学计量分析

根据2008 2009年在深圳大鹏澳养殖海域周年4个季节的生态环境调查数据,采用化学计量学方法(主成分分析、系统聚类分析和分类主成分分析)研究了大鹏澳养殖海域生态环境的时空变化。结果表明,第一主成分以海水温度、盐度、海水营养盐中的无机三氮、硫化物、叶绿素a(Chla)和颗粒有机物(POM)等为特征,表征了大鹏澳海洋生态环境主要受气候和水文因素的影响;第二主成分以海水磷酸盐(PO4-P)和沉积物硫化物为特征,与网箱养殖自身污染效应有关;第三主成分以海水溶解氧(DO)和化学需氧量(CODMn)为特征,与养殖生物耗氧代谢活动有关;第四主成分以沉积物有机质为特征,与养殖贝类的生物沉降作用有关。该养殖海域生态环境的时空分布特征主要受亚热带季风气候和养殖活动的空间布局及其季节周期性养殖生产的共同影响。

Using chemometric methods to study the mariculture eco-environ­ment in Dapeng Cove, China

We evaluated the spatial and temporal variation in the eco-environment of a mariculture area in Dapeng Cove,China using chemometric techniques and principal component analysis(PCA),clustering analysis(CA),and categorical principal component analysis(CATPCA).PC1 was associated with temperature,salinity,dissolved inorganic nitrogen(nitrate,nitrite,and ammonium),water sulfide,chlorophyll a and particulate organic matter,reflecting the influence of the seasonal transition of climate and hydrology.PC2 was characterized by phosphorus and sediment sulfide,primarily due to self-pollution from fish cage farming.PC3 was characterized by dissolved oxygen and chemical oxygen demand,related to the oxygen metabolism of cultured animals.PC4 was character-ized by sediment organic matter,related to the biodeposition effect of oyster raft farming.The spatial-temporal variation in the eco-environment of the mariculture area were primarily affected by the subtropical monsoon cli-mate combined with spatial and seasonal changes in the artificial production of caged fish and oysters.