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据1990年11月至1991年8月间调查资料，提出刘公岛水域内叶绿素－a含量的时空分布和初级生产力的分布与变化。指出此分布与该水域温度和营养盐含量密切相关。叶绿素－a含量以春季最高，冬季次之，秋季稍低，夏季最低。年变幅为0．21～2．45mg／m3，年平均值为1．02mg／m3。初级生产力以夏季最高，春季次之，秋季略低，冬季最低，年变幅为33．40～512．72mg·c／m2·d，年平均值为181．15mg·c／m2·d。 相似文献
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2011 年春、夏季黄、东海叶绿素a和初级生产力的时空变化特征 总被引：2，自引：0，他引：2
依据2011年春、夏两季黄、东海调查资料,分析了叶绿素a和初级生产力的空间分布和季节变化特征,并分析了主要影响因素。南黄海、东海北部春季叶绿素a平均含量为74.83mg/m2,夏季为23.84mg/m2,春季明显高于夏季。春季大部分海域叶绿素a含量垂直分布均匀,夏季则出现较为明显的分层现象,在次表层出现最大值。初级生产力水平春季为993.9mgC/(m2.d),夏季为1274mgC/(m2.d),与1984—1985年相比有所升高。春季高值区出现在黄海中部及长江口附近海域;夏季高值区主要分布在山东半岛南岸近海海域、长江口外的黄、东海交界海域以及浙江省沿岸海域。春季整个调查海区叶绿素a浓度与磷酸盐浓度呈显著负相关,与氮磷比呈显著的正相关性,表明黄、东海春季磷酸盐可能成为浮游植物生长的一个限制因子。 相似文献
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依据2008年春季(5月)、夏季(8月)、秋季(11月)和2009年冬季(2月)的现场调查结果,分析了东海区叶绿素a、初级生产力的平面分布、垂直分布和季节变化的特征,并探讨了其影响因素。结果表明,四个航次叶绿素a浓度分别为1.33、0.93、1.61和0.65 mg/m3,秋季春季夏季冬季。春季、夏季和秋季最大值均出现在0—10m水层,冬季最大值出现在底层。叶绿素a浓度远海年季变化较小,近岸区和垂直分布年季变化较大。四个航次初级生产力平均为375.03、414.37、245.45和102.60 mg/(m3 h),夏季秋季春季冬季。叶绿素a浓度和初级生产力水平均高于历史同期值。鱼外渔场的年平均初级生产力最大,海州湾渔场最小。通过分析叶绿素a和环境因子的相关性表明,叶绿素a与浮游植物显著正相关;春季和秋季的低温以及春季和夏季的低盐比较适合浮游植物的生长;活性磷酸盐可能是限制春季和秋季叶绿素a的重要因素。 相似文献
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珠江口浮游植物叶绿素a和初级生产力的季节变化及其影响因素 总被引：1，自引：0，他引：1
《热带海洋学报》2017,(1)
基于2014—2015年4个季节的现场调查数据,系统阐述了珠江口水域浮游植物叶绿素a和初级生产力的空间分布和季节特征,并结合环境因子进行了分析。结果表明:研究水域表层年平均叶绿素a浓度和初级生产力分别为3.77mg·m~(–3)和27.86mg C·m~(–3)·h~(–1),季节变化均为春季夏季秋季冬季。径流量是珠江口浮游植物空间分布的主要驱动因素,并且浮游植物的旺发与河口盐度锋面的位置密切相关。径流较小的季节,由于珠江口外营养盐浓度较低,叶绿素a浓度高值区出现在内伶仃洋水域;随着径流量的增加,叶绿素a浓度高值区随盐度锋面向珠江口外移动,而口门附近浮游植物生长受光限制和径流稀释影响并未出现高值。初级生产力的空间分布趋势与浮游植物叶绿素a相似,二者之间存在显著的正相关关系。研究还表明:夏季,珠江口外由于浮游植物旺发消耗了大量营养盐,磷酸盐浓度被耗尽使其成为浮游植物生长的限制因子;冬季,光限制和低温可能是造成浮游植物初级生产力较低的原因。与以往研究结果对比,珠江口初级生产力处于中间水平,浮游植物碳同化系数年平均值为7.51mg C·(mg Chl a)~(–1)·h~(–1),河口固碳水平为261.52g C·m~(–2)·y~(–1)。 相似文献
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山东半岛东部诸岛水域叶绿素—a含量和初级生产力 总被引：1，自引：0，他引：1
据１９９０．１１－１９９１年８月期间，山东半岛东部诸岛水域调查资料，分析了该水域叶绿素－ａ含量的时空分布和初级生产力的分布与变化，此分布与该水域的温度和营养盐水含量密切相关。叶绿素－ａ含量的季节变化分三种类型，年变幅为０．１１－１２．８１ｍｇ／ｍ＾３，年平均值为１．１７ｍｇ／ｍ＾３。初级生产力夏季〉春季〉秋季〉冬季，年变幅为２３．００－７９１．６０ｍｇ．ｃ／ｍ＾２．ｄ年平均为１５２．０ｍｇ．ｃ／ｍ 相似文献
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福建省同安湾叶绿素的含量 总被引：5，自引：0，他引：5
根据1998年2月、5月、8月、11月对同安湾叶绿素a含量的调查,分析了同安湾叶绿素a的季节分布,并估算了初级生产力C的含量,调查结果表明春季的叶绿素a含量为全年最高,范围为2.68 μg/L～16.24 μg/L,平均值为7.22 μg/L,初级生产力C平均为4286.4mg/m2.d;夏季叶绿素a含量为1.03μg/L～5.40 μg/L,平均值为.3.34 μg/L;秋季叶绿素a含量为0.36 μg/L～1.50 μg/L,平均值为0.87μg/L,初级生产力C平均为32.84mg/mg.d;冬季叶绿素a含量为1.11μg/L～2.21μg/L,平均值为1.56 μg/L.本文还将此次调查结果与历史资料作了比较. 相似文献
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The primary production and chlorophyll a concentration of picoplankton （0.2 - 2 μm） , nanoplankton （2 - 20μm） and micro- plankton （20 -200 μm） are described in the northeastern Pacific Ocean near the Hawaii Islands during the six survey cruises from 1996 to 2003：DY85-4, DY95-7, DY95-8, DY95-10, DY105-11 and DY105-12.14. The primary production of carbon was in range from 76.8 to 191.9 mg/（m^2 · d） with an average of 116.1 mg/（ m^2 · d） in the east region, and from 73.1 to 222.5 mg/（ m^2 · d） with an average of 127.1 mg/（ m^2 · d） in the west region, similar to the other oligotrophic regions of the Pacific Ocean investigated. The chlorophyll a concentration was about 0.1 mg/m^3 from the surface to the 50 m depth, about 0.2 -0.4 mg/m^3from 50 to 100 m, and gradually decreased below the 100 m depth. The picoplankton accounted for more than 70% of the total chlorophyll a in the upper layer （ surface to 125 m）, but it decreased to less than 50% in depth below 125 m. The nanoplankton and microplankton combined only accounted for less than 30% of the total chlorophyll a in the upper layer, but showed a more even vertical distribution. 相似文献
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In December–January of 2010 the spatial distribution of the phytoplankton production characteristics was studied along transects
in the vicinity of the Greenwich meridian (I) and in the Drake Passage (II). On transect I, the surface chlorophyll a concentration and primary production varied from 0.11 up to 3.57 mg/m3 and from 4.38 up to 37.47 mgC/m3 per day, respectively. The chlorophyll a in the photosynthetic layer and the integrated primary production varied from 10.7 up to 66.1 mg/m2 and from 83 to 646 mgC/m2 per day, respectively. On transect II in the surface layer, the chlorophyll a concentration changed within the range of 0.09–1.02 mg/m3 and the primary production ranged from 2.08 to 9.49 mgC/m3. The integrated values ranged from 6.32 to 38.29 mg/m2 and from 41 to 221 mgC/m2 per day, respectively. The moderate means of themaximum quantum yield (F
v/F
m) on transects I and II (0.41 and 0.35, respectively) testify to the low activity of the phytoplankton’s photosynthetic apparatus.
The studied water areas in the Southern Ocean differed both in the phytoplankton biomass expressed in the chlorophyll a concentration values and in the conditions of the primary production formation. 相似文献
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1Introduction Thephytoplanktonistheprimaryproducerofor- ganicsubstancesintheoceanandplaysanimportant roleinthesubstancecycleandenergyconversionof marineecosystem.Chlorophyllaconcentration(Chla) isanimportantindexmanifestingthelightenergy-au- totrophicbiomassinthesea.Primaryproductivityre- flectstheabilitytoconvertinorganiccarbonintoor- ganiccarbonbythephytoplanktonintheocean.Both Chlaandprimaryproductivityaretheimportantcon-tentsbeingstudiedinthemarineecosystemaswellas theimportantfoundationa… 相似文献
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DAI Fangfang WANG Zipan YAN Xiaojun LI Zhijun ALLHUSEN Erik DIECKMANN Gerhard 《海洋学报(英文版)》2010,29(3):97-105
The investigation on sea-ice biology in combination with physics, chemistry and ecology was carried out in the northwestern Weddell Sea, Antarctica, during the cruise ANT/XX III-7 on board POLARSTERN in the austral winter (August-October) in 2006. The distribution of chlorophyll a was measured and related to sea ice texture. The mean concentrations of chlorophyll a in the sea ice varied considerably with ice texture. The concentration of chlorophyll a per core ranged from 2.10– 84.40 μg/dm 3 with a mean of 16.56 μg/dm 3 . And the value of R (chlorophyll a / gross chlorophyll) ranged from 0.79–0.83. These high winter chlorophyll values indicate that primary production is considerable and confirms that there is significant primary production in Antarctic sea ice during winter. Thus this constitutes a major proportion of southern ocean primary production and carbon flux before the sea ice retreats. 相似文献
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2006年8-10月极星号ANT/XXⅢ-7航次,对南极威德尔海西北海域浮冰区进行海冰综合考察,采用海冰物理学、海冰化学和海冰生态学等多学科现场同步观测取样与分析研究新方法。结果显示,测区21个冰站不同冰龄和不同结构类型的海冰冰芯,叶绿素a含量总平均值为16.56μg/dm3,范围为2.10~84.40μg/dm3,叶绿素a相对总量的R值均值为0.79~0.83。冰体叶绿素a含量与分布取决于海冰冰晶物理结构及其所处冰层部位,并和海冰生成环境、冰体发育和成冰过程密切相关。研究结果证实南极冬季海冰叶绿素a含量普遍处于较高水平,海冰冰藻具有较强活性,由此表明从整体上南极冬季海冰具有较高初级生产能力。这对正确分析估算冬季南极海洋生物生产,重新评估南大洋碳通量及其在全球气候变化中的贡献,具有重要科学意义。 相似文献
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Research was implemented from September 15 through October 4, 2011 in the Kara Sea along transects located southeastwards Novaya Zemlya, in the St. Anna Trough, the Yenisei River estuary, and the adjacent shelf. The concentration of chlorophyll a was the highest in the photic zone (0.05–2.30 mg/m3, on average, 0.80 ± 0.37 mg/m3). The maximal concentration of Chl a at most of the stations located in the water layer of 7–30 m. Integral primary production in the water column varied from 3.0 to 151.0 mg C/m2 per day, on average, 37.2 ± 36.6 mg C/m2 per day. The maximal rate of primary production at most of the stations has been observed for the surface layer of the water column. Within the upper mixed water layer, relative primary production was from 31 to 100% (on average, 77 ± 20%). The most productive zone was the waters along Yenisei transect. In the estuary and at the adjacent shelf, primary production was 50 mg C/m2 per day, exceeding the range observed for other areas by 1.5–2.0 times. The concentrations of silica and nitrogen together with light regime and water temperature were the major limiting factors affecting the primary production rate in the Kara Sea in autumn. 相似文献
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Seasonal variation of the integrated primary production (IPP) and surface chlorophyll (Chl0) in different regions of the Kara Sea was studied from satellite data obtained by the MODIS-Aqua colour scanner and averaged for 2003–2015. The minimum variation of Chl0 concentration during the growing season (from April to October) was 1.5 times in southwestern region and 2 times in the northern region of the sea. It was found that the Chl0 concentration increased slightly in all regions by the end of the growing season. The maximum IPP value recorded in June coincided with the peak level of photosynthetically active radiation (PAR) and maximum river discharge. The IPP value varied in a wider range compared with the Chl0 concentration. The ratio of the maximum and minimum monthly average IPP values varied from 8.9 times in Southwestern region to 11.7 times in the Northern region of the sea. The average increase in the Chl0 concentration was 1.7 times (from 0.78 mg/m3 in April to 1.29 mg/m3 in October). The IPP value varied by a factor of 10.7 (from 26 mg C/m2 per day in October to 279 mg C/m2 per day in June). The article also discusses the influence of water column stratification, the concentration of nutrients, the PAR level, and river discharge on the seasonal IPP dynamics in the Kara Sea. 相似文献
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In the coastal and estuarine waters of Goa, particulate organic carbon (POC) varied from 0.52 to 2.51 mg l?1 and from 0.28 to 5.24 mg l?1 and particulate phosphorus (PP) varied from 0.71 to 5.18 μg l?1 and from 0.78 to 20.34 μg l?1, respectively. The mean values of chlorophyll and primary productivity were 1.94 mg m?3 and 938.1 mg C m?2 day?1 in the coastal waters and 4.3 mg m?3 and 636.5 mg C m?1 day?1 in the estuarine waters, respectively. ratios were low in June and October even when POC values were quite high. The POC in surface waters was linearly correlated with the chlorophyll content. Also PP increased when chlorophyll and primary productivity remained high. The results suggest that the phytoplankton was sharply increasing and contributed to POC and PP content. The percentage of detritus calculated from the intercept values of chlorophyll on POC varied from 46 to 76% depending on season. Results indicate that the major portion of POC and PP during postmonsoon (October–January) is derived from phytoplankton production while the allochthonous matter predominate during monsoon (June–September). 相似文献
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S. A. Mosharov 《Oceanology》2010,50(6):884-892
The studies were performed from September 10 to 29 of 2007 in the Kara Sea in transects westward of the Yamal Peninsula, near
the St. Anna Trough, in the Ob River’s estuary, and on the adjacent shelf. The concentration of chlorophyll a in the euphotic layer changed from 0.02 to 4.37 mg/m3, amounting on the average to 0.76 mg/m3. The primary production in the water column varied from 10.9 to 148.0 mg C/m2 per day (the mean was 56.9 mg C/m2 per day). It was shown that frontal zones divided the Kara Sea into distinct areas with different productivities. The maximum
levels of the primary production were measured in the deep part of the Yamal transect (132.4 mg C/m2 per day) and the shallow Kara Sea shelf near the Ob River’s estuary (74.9 mg C/m2 per day). The characteristics of these regions were the low salinity of the surface water layer (19–25 psu) and the elevated
silicon content (12.8–28.1 μg-atom Si/l), which is explainable by the river water inflow. The frontal zones of the Yamal Current
in the Yamal and Ob transects displayed high values of the assimilation numbers, amounting to 2.32 and 1.49 mg C/mg of chlorophyll
per h, respectively (the maximal for the studied regions). 相似文献