LONG-TERM CHANGES OF CHLOROPHYLL-a CONCENTRATION AND PRIMARY PRODUCTIVITY IN THE JIAOZHOU BAY
LONG-TERM CHANGES OF CHLOROPHYLL-a CONCENTRATION AND PRIMARY PRODUCTIVITY IN THE JIAOZHOU BAY
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发表时间：
2011
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通讯作者：
Sun Xiao
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作者：
Sun Xiao
叶绿素a的长期变化。a)研究了胶州湾1984-2008年的集中度和初级生产力。结果表明：Chl的空间分布没有明显变化。chl .a浓度在近20 a间呈现出从海湾东北部和西北部向海湾口下降的趋势。Chl季节特征的变化。浓度很明显，例如：冬季和夏季呈上升趋势，春季和秋季呈下降趋势，呈现双峰特征，特别是胶州湾北部沿海地区和东北部地区。从长期来看，Chl。a浓度在1 ~ 4.76mg/m3之间波动，2月和8月呈微弱上升趋势，5月和11月呈下降趋势。类似于Chl。初级生产力的集中度也有所波动，但长期没有观察到下降的趋势。1980年、1990年和2000年3个时期的平均季节性初级生产力分别为334.41、354.39、347.73 mgc /（m2·d）。Chl的长期变化。胶州湾海水养殖贝类的a浓度和初级生产力受营养物浓度增加和摄食压力的影响。
Long-term changes of chlorophyll a(Chl.a) concentration and primary productivity in Jiaozhou Bay during 1984—2008 were studied in this work.The results indicated that there was no significant change on the spatial distribution of Chl.a concentration in the last 20 years.Chl.a concentration showed a decreasing trend from the northeastern and northwestern parts of the Bay to the Bay mouth.Change in the seasonal characteristics of Chl.a concentration was evident,e.g.,it increased in winter and summer,and decreased in spring and autumn,showing a dual-peak feature,especially in the coastal area of the north and the northeast regions of the Jiaozhou Bay.For the longer-term timeframe,Chl.a concentration fluctuated from 1 to 4.76mg/m3 and its concentration showed a weak increasing trend from February and August,and a decreasing trend in May and November.Similar to Chl.a concentration,primary productivity also fluctuated,although no decreasing trend was observed for the long term.Average seasonal primary productivities in the three periods of 1980's,1990's,and 2000's were 334.41,354.39,347.73mgC/(m2·d),respectively.Long-term changes in Chl.a concentration and primary productivity were affected by both the increased nutrient concentrations and the feeding pressure of maricultured shellfish in the Jiaozhou Bay.