海洋科学
海洋科學
해양과학
MARINE SCIENCES
2014年
7期
63-69
,共7页
北部湾铁山港%营养盐分布%季节变化%影响因素
北部灣鐵山港%營養鹽分佈%季節變化%影響因素
북부만철산항%영양염분포%계절변화%영향인소
Tieshangang bay%nutrition distribution%nutrition structure%seasonal variation
通过3个航次的调查,分析了2008年枯水季、丰水季和平水季广西铁山港附近海域无机氮、活性磷酸盐和活性硅酸盐的分布特征及营养盐结构特征,探讨该海域营养盐季节变化及其影响因素。结果表明,铁山港附近海域无机氮的浓度范围为1.03~44.99μmol/L,活性磷酸盐浓度为0.03~1.57μmol/L,活性硅酸盐的浓度为7.86~102.14μmol/L。高浓度的营养盐主要分布在铁山港湾内及靠岸站点,营养盐的浓度均从铁山港湾口向北海南部海域呈递减的趋势。无机氮、活性磷酸盐和活性硅酸盐显现了相近的季节变化特征,即枯水期到丰水期浓度增加之后从丰水期到平水期浓度降低。该海区无机氮主要以硝酸盐氮和氨氮占最主要比重,枯水期和丰水期以硝酸盐氮为主而平水期以氨氮为主。海区N/P和Si/P较高,表明该海区N限制减弱而P限制加重。铁山港营养盐的季节变化主要受到径流等输入的影响,浮游植物的消耗也可能是其季节变化的原因之一。
通過3箇航次的調查,分析瞭2008年枯水季、豐水季和平水季廣西鐵山港附近海域無機氮、活性燐痠鹽和活性硅痠鹽的分佈特徵及營養鹽結構特徵,探討該海域營養鹽季節變化及其影響因素。結果錶明,鐵山港附近海域無機氮的濃度範圍為1.03~44.99μmol/L,活性燐痠鹽濃度為0.03~1.57μmol/L,活性硅痠鹽的濃度為7.86~102.14μmol/L。高濃度的營養鹽主要分佈在鐵山港灣內及靠岸站點,營養鹽的濃度均從鐵山港灣口嚮北海南部海域呈遞減的趨勢。無機氮、活性燐痠鹽和活性硅痠鹽顯現瞭相近的季節變化特徵,即枯水期到豐水期濃度增加之後從豐水期到平水期濃度降低。該海區無機氮主要以硝痠鹽氮和氨氮佔最主要比重,枯水期和豐水期以硝痠鹽氮為主而平水期以氨氮為主。海區N/P和Si/P較高,錶明該海區N限製減弱而P限製加重。鐵山港營養鹽的季節變化主要受到徑流等輸入的影響,浮遊植物的消耗也可能是其季節變化的原因之一。
통과3개항차적조사,분석료2008년고수계、봉수계화평수계엄서철산항부근해역무궤담、활성린산염화활성규산염적분포특정급영양염결구특정,탐토해해역영양염계절변화급기영향인소。결과표명,철산항부근해역무궤담적농도범위위1.03~44.99μmol/L,활성린산염농도위0.03~1.57μmol/L,활성규산염적농도위7.86~102.14μmol/L。고농도적영양염주요분포재철산항만내급고안참점,영양염적농도균종철산항만구향북해남부해역정체감적추세。무궤담、활성린산염화활성규산염현현료상근적계절변화특정,즉고수기도봉수기농도증가지후종봉수기도평수기농도강저。해해구무궤담주요이초산염담화안담점최주요비중,고수기화봉수기이초산염담위주이평수기이안담위주。해구N/P화Si/P교고,표명해해구N한제감약이P한제가중。철산항영양염적계절변화주요수도경류등수입적영향,부유식물적소모야가능시기계절변화적원인지일。
Based on the data obtained from three cruises in dry, flood and normal seasons in 2008, the spatial distribution and seasonal variation of inorganic nitrogen, reactive silicate and phosphate as well as nutrient structure in adjacent waters of the Tieshangang bay in Guangxi were studied. The concentration of inorganic nitrogen ranged from 1.03 to 44.99 μmol/L, while the reactive silicate ranged from 0.03 to 1.57 μmol/L and phosphate ranged from 7.86 to 102.14 μmol/L, respectively. The high nutrient concentration was mainly located in the inner of the Tieshangang bay and coastal stations. Concentration of nutrition gradually decreased from the mouth of Tieshangang bay to the sea area in the south of Beihai city. Similar seasonal changes of inorganic nitrogen, reactive silicate and phosphate were also observed, which increased from dry season to flood season, and then fell in normal season. Nitrate and ammonia are the major composition of the inorganic nitrogen in the study area. Nitrate took the largest part of nitrogen in dry season and flood season, while turned to ammonia in normal season. The ratio of N︰P and Si︰P was relatively high in the study area, and P became the limited nutrition. Seasonal variation of nutrition in the Tieshangang bay is mainly influenced by river run-off and phytoplankton consumption.
