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1.
Systematic studies of the changes in dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) and their
effects on phytoplankton over the last 30 years in the Bohai Sea are presented. The amount of sewage disposal, use of fertilizer
and the Huanghe River runoff were found to have a significant influence on the DIN or DIP concentrations in the Bohai Sea
over the last 30 years. Moreover, the changes in DIN and DIP resulted in changes in the limiting nutrients of phytoplankton
in the Bohai Sea from nitrogen in the early 1980s to nitrogen-phosphorus in the late 1980s, and then to phosphorus after the
1990s. In addition, changes in nitrogen and phosphorus had a significant effect on the phytoplankton community structure.
The half saturation constant (K
s) was used to evaluate the effect of nutrients on the phytoplankton community structure in the Bohai Sea over the last 30
years. Cell abundance percentages of dominant phytoplankton species with high K
s values for phosphorus and low K
s values for nitrogen have decreased since the 1980s, while those of dominant phytoplankton species with low K
s values for phosphorus and high K
s values for nitrogen increased during this period. 相似文献
2.
This study on the distribution of phosphate and its relation to phytoplankton biomass in Western Xiamen Harbor using marine
ecosystem enclosures to isolate the culture water from the tidal currents and salinity changes outside indicated that the
phytoplankton biomass variation closely related to dissolved inorganic phosphorus (DIP) in the seawater as described by the
equation: [Chl-a]=A×e−B[PO4]. The biomass changes lagged by about two days the corresponding DIP. The research also dealt with the minimal DIP concentration
for stopping diatom bloom and the possible maximal diatom biomass was estimated from the DIP external concentration in the
seawater. The threshold of DIP initiatingSkeletonema costatum red tide was calculated for use as an index to forecast its red tides. In addition, the relationships between a dinoflagellate
red tide and nutrients are discussed. The results showed that the multiplication of dinoflagellate was not entirely dependent
on the nutrients in the seawater.
Project 39570145 supported by the NSFC and Fujian Science Foundation (No. D94010). 相似文献
3.
ＩＮＴＲＯＤＵＣＴＩＯＮＰｈｏｓｐｈｏｒｕｓｉｓａｋｅｙｎｕｔｒｉｔｉｖｅｅｌｅｍｅｎｔｆｏｒｔｈｅｇｒｏｗｔｈｏｆｍａｒｉｎｅｐｈｙｔｏｐｌａｎｋｔｏｎ .Ｒｅｃｅｎｔｌｙ ,ｂｅ ｃａｕｓｅｏｆｅｎｖｉｒｏｎｍｅｎｔａｌｐｏｌｌｕｔｉｏｎ ,ｔｈｅｅｕｔｒｏｐｈｉｃａｔｉｏｎｐｒｏｂｌｅｍｓｉｎｃｏａｓｔａｌａｎｄｏｃｅａｎｉｃｗａｔｅｒｓｈａｖｅｂｅ ｃｏｍｅｍｏｒｅａｎｄｍｏｒｅｓｅｒｉｏｕｓ.Ｔｈｅｅｎｖｉｒｏｎｍｅｎｔｅｃｏｌｏｇｉｃａｌｒｅｓｐｏｎｓｅｉｎｔｈｅｌｏｎｇ ｔｅｒｍｔｏｔｈｅｆ… 相似文献
4.
A bloom of the dinoflagellate Scrippsiella trochoidea was detected for the first time in inner Tolo Harbor, Hong Kong in 2 000. Water samples were collected at eight stations
along a transect passing through a red tide patch for microscopic analysis of phytoplankton composition and high-performance
liquid chromatography (HPLC) analysis of phytoplankton pigments. During the bloom, the density of dinoflagellates was 1.1×106 cells L−1 within the patch and 8.6×105 cells L−1 outside the patch where the phytoplankton community was dominated by diatoms. After the bloom the S. trochoidea began to decrease in density and was replaced by diatoms as the dominating bloom-causing organisms at all stations, and the
density of dinoflagellates at most stations was less than 1.0 × 106 cells L−1. The status of S. trochoidea as the causative species of the bloom was indicated by the presence of peridinin, the marker pigment for dinoflagellates.
The shift from dinoflagellates to diatoms was marked by the decline of peridinin and the prevalence of fucoxanthin. Phytoplankton
pigment markers also revealed the presence of other minor phytoplankton assemblages such as cryptomonads and blue-green algal. 相似文献
5.
THE BIOGEOCHEMISTRY OF PHOTOSYNTHETIC PIGMENTS IN THE JIULONG RIVER ESTUARY AND WESTERN XIAMEN BAY 总被引：2，自引：0，他引：2
ＩＮＴＲＯＤＵＣＴＩＯＮＫｎｏｗｌｅｄｇｅｏｆｔｈｅｄｉｓｔｒｉｂｕｔｉｏｎａｎｄｃｏｍｐｏｓｉｔｉｏｎｏｆｔｈｅｃｈｌｏｒｏｐｈｙｌｌａｎｄｃａｒｏｔｅｎｏｉｄｐｉｇｍｅｎｔｓｉｎｃｏａｓｔａｌｍａｒｉｎｅｗａｔｅｒｓｐｒｏｖｉｄｅｓｉｎｆｏｒｍａｔｉｏｎｏｎｔｈｅｐｈｙｔｏｐｌａｎｋｔｏｎｂｉｏｍａｓｓａｎｄａｌｓｏｏｎｉｔｓｃｈｅｍｏｔａｘｏｎ ｏｍｙ ,ｔｈｅｃｏｎｔｒｉｂｕｔｉｏｎｏｆｒｉｖｅｒｉｎｅｉｎｐｕｔｓ,ａｎｄｔｈｅｅａｒｌｙｄｅｇｒａｄａｔｉｏｎｒｏｕｔｅｓｏｃｃｕｒｒｉｎｇｉ… 相似文献
6.
To understand the relationship between the plankton community and environmental factors and water quality in the Bayuquan Port of Liaodong Bay, China, and investigations were carried out during six different periods (April 2009, April 2010, October 2011, April 2012, October 2012, and April 2013). This area was characterized by high levels of nutrient and suspended solids (SPS) during survey periods, and eutrophication led to the occurrence of red tides in April and October 2012 and April 2013. Our analyses revealed that the plankton communities of Bayuquan Port lacked stability and were affected seriously by external disturbance (e.g., oceanographic engineering and river runoff). Our data indicate that oil, dissolved inorganic nitrogen (DIN), SPS, and chlorophyll a (Chl-a) were key factors that regulated the phytoplankton and zooplankton communities. The partial redundancy analysis (partial RDA) suggested that oil and SPS were the most important environmental variables affecting the phytoplankton community in April 2010 and 2012, whereas DIN concentration played a governing role in zooplankton dynamics. Oil and Chl- a concentrations affected significantly the zooplankton community in October 2012. Therefore, the plankton communities could reflect both dynamic changes in coastal environmental factors and the ongoing eutrophication process caused by anthropogenic activities in this area. 相似文献
7.
Effects of nitrogen (N) and phosphorus (P) from different sources and at different concentrations on the growth of Levanderina fissa (= Gyrodinium instriatum) were studied in laboratory conditions. The findings might explain the recurrent blooms of this species in Pearl River Estuary, China. Results showed that nutrient limitation significantly inhibited the growth of L. fissa. The values of specific growth rate (μ max) and half-saturation nutrient concentration (K S) were 0.37 divisions/d and 8.49 μmol L?1 for N, and 0.39 divisions/d and 1.99 μmol L?1 for P, respectively. Based on K S values, dissolved inorganic N level in PRE was sufficient to support the high proliferation of L. fissa, while dissolved inorganic P concentration was far lower than the minimum requirement for its effective growth. L. fissa was not able to utilize dissolved organic N (DON) compounds such as urea, amino acids, and uric acid. However, it grew well by using a wide variety of dissolved organic P (DOP) sources like nucleotides, glycerophosphate, and 4-nitrophenylphosphate. The results from this study suggested that the ability in DOP utilization of L. fissa offers this species a competitive advantage in phytoplankton communities. The high level and continuous supply of DIN, enrichment of DOP, together with warm climate and low salinity in the Pearl River Estuary provided a suitable nutrient niche for the growth of L. fissa, and resulted in the recurrent blooms in the estuary. 相似文献
8.
We recorded NO 3-N, NO 2-N, NH 4-N, PO 4-P, SiO 3-Si, salinity, and temperature data at 10 stations in the Dongshan Bay in May, June, July, August, October, and November 2008, analyzing nutrient and eutrophication characteristics. The mean concentration of dissolved inorganic nitrogen(DIN) was 0.30–0.40 mg/dm 3; generally, NO 3-N was the main form in most areas. The mean concentrations of PO 4-P and SiO 3-Si were 0.040–0.060 mg/dm 3 and 1.00–1.50 mg/dm 3, respectively. We proved that the majority of the SiO 3-Si in the Dongshan Bay came from the Zhangjiang River, with some coming from the Bachimen Strait. DIN originated from both the Zhangjiang River and the Bachimen Strait. Most PO 4-P originated from the Bachimen Strait, and some came from the Zhangjiang River. We found that P was an overall limiting factor to the phytoplankton community in most of the Dongshan Bay, and that Si and N were in surplus. However, near the Bachimen Strait Si became a limiting factor, especially for diatoms, while P and N were in comparative surplus. We used a potential eutrophication assessment method to analyze eutrophication, and showed that the most serious eutrophication occurred near the Zhangjiang River estuary and near the Bachimen Strait. In 2008, DIN levels were four times higher than that in 1988; PO 4-P levels were threefold higher, while SiO 3-Si was approximately double. Dissolved nutrients increased between 1988 and 2008. DIN increased at the greatest rate comparing to PO 4-P and SiO 3-Si, thus the N/P and N/Si mol ratios increased. Further studies on the effects of high DIN concentrations on the phytoplankton communities and marine ecosystems of the Dongshan Bay are needed. 相似文献
9.
【目的】分析评价2010-2017年嵊泗马鞍列岛保护区海域的水质状况。【方法】采用水质有机污染指数(A)法进行水质有机污染评价,采用富营养化指数(E)法和营养状态质量指数(INQ)法进行水质富营养化评价。【结果】该保护区海域水质化学需氧量(COD)和溶解氧(DO)符合第一类海水水质标准,无机磷(DIP)含量有3个年份符合第一类海水水质标准,其余年份超过第一类但符合第二类海水水质标准,无机氮(DIN)质量浓度超标严重,2015年达到0.674 mg/L;叶绿素a(Chl-a)本底含量较高,适宜条件下使得浮游植物大量繁殖,Chl-a含量急剧上升,并容易诱发赤潮;有机污染指数评价显示,2012-2015年水质有机污染状况达到中度污染以上,并且有3年达到严重污染级别,最大A值为2014年和2015年的4.10,2016年污染最轻,为开始受到污染级别;富营养化指数和营养状态质量指数评价显示,最大E值和INQ值分别为2012年的4.29和2010年的8.59,DIN含量高是富营养化的主要贡献因子。【结论】该保护区海域水质主要污染因子为DIN,水质有机污染状况呈现年度波动状态,水质富营养化较严重。 相似文献
10.
Both nitrate (NO3−) and soluble reactive phosphate (PO43−) concentration in the freshwater end-member at the mouth of the Changjiang River have increased dramatically since the 1960s.
Within the same period in the sea area, with surface salinity>30, NO3− concentration has shown an obvious increase, PO43− has not changed greatly and dissolved reactive silica (SiO32−) has deceased dramatically. An examination of the elemental ratio of NO3− to PO43− at the mouth of the Changjiang River did not show a systematic trend from the 1960s to 2000s largely because both nutrients
increased simultaneously. In comparison, the elemental ratio of dissolved inorganic nitrogen (DIN) to PO43− in surface seawater, with salinity>22, has shown a clearly increasing trend. Furthermore, an overall historical change of
the SiO32−:PO43− ratio has undergone a reverse trend in this area. Based on the changes of SiO32−:PO43− and DIN:PO43− ratios, we can conclude that an overall historical change of SiO32−:DIN ratio has decreased in this area from the 1950–1960s to 2000s. The argument that phytoplankton productivity in the Changjiang
estuary has been enhanced by increasing nutrient input from the riverine transport was supported by these results. A comparative
study analyzing the shift of phytoplankton composition from the mid-1980s to 2000s was also made. The results indicated that
the average yearly percentage of diatom species in the Changjiang estuary has decreased from 84.6% during 1985–1986 to 69.8%
during 2004–2005. Furthermore, the average yearly percentage of diatom abundance in the Changjiang estuary decreased from
99.5% during to 75.5% over the same time period, while the abundance of dinoflagellates has increased dramatically, from 0.7%
to 25.4%. 相似文献
11.
Relationships between phytoplankton community composition and environmental variables in the East China Sea (ECS) and Yellow
Sea (YS) were investigated using geochemical and molecular microbiology methods. The diversity of phytoplankton was characterized
using cultivation-independent PCR-based denaturing gradient gel electrophoresis (DGGE). Groups resulting from unweighted pair-group
method with arithmetic averages clustering of the DGGE profiles showed good consistency with the eco-environmental characteristics
of the sea area they belonged to. Additionally, the clustering results based on DGGE fingerprinting and those based on morphological
compositions were practically identical. The relationship of phytoplankton diversity to environmental factors was statistically
analyzed. Temperature, dissolved inorganic nitrogen (DIN), and silicate-Si were found significantly related to the phytoplankton
community composition. Canonical correspondence analysis (CCA) was performed to reveal the relationship between community
composition and these three environmental factors. Generally, values of the ECS are clearly separated from those of the YS
in the CCA biplot, due to mainly the effect of temperature and DIN. 相似文献
12.
依据香港特别行政区环境保护署于1999—2007年106个航次的调查资料,结合国家海洋局南海分局于1998—2007年10个航次的调查资料,简要描述和分析大鹏湾海水中可溶性无机氮(DIN)和可溶性无机磷(DIP)含量的多年平均分布变化。结果表明,DIN和DIP含量均夏、冬季较高,而春、秋季较低;受香港和深圳等陆源排放影响,四季吐露港西部和沙头角海区域的DIN和DIP含量普遍比其他区域高;夏季南澳养殖场附近水域的DIN也明显较高,可能与养殖场的饵料投放有关。大鹏湾海水中平均氮磷原子比大于16,而DIN和DIP的平均含量分别为0.069和0.009 mg/L。夏季,由于外海高盐水的入侵,底层水中DIN和DIP含量明显高于表层。9 a调查期间,大鹏湾香港海区海水中DIN和DIP含量的年际变化呈较明显下降趋势,而氮磷原子比的年际变化则呈上升趋势。 相似文献
13.
《中国海洋湖沼学报》2021,(2)
To understand the influence of Kuroshio intrusion on the phytoplankton community,a field investigation was conducted in spring 2017 in the East China Sea(ECS),and 130 seawater samples were collected and analyzed.Trichodesmium comprised the highest cell abundance contributing about 66%of the total phytoplankton followed by diatoms(17%) and dinoflagellates(16%).The dominance of the Kuroshio Waters(KW) and the Taiwan Warm Currents(TWC) were higher than the Coastal Waters(CW).The vertical distribution of physicochemical parameters depicted the intrusion of KW at the bottom layer,but it failed to reach the surface as strong upwelling was not initiated.Therefore,the dissolved inorganic phosphate(DIP) concentrations and P/N ratios were the lowest in the CW and the upper water layers,which limited the diatom growth in this area.Besides,the dinoflagellates cell abundance was also lower except in the surface and CW,though they comprised the maximum richness of species among the phytoplankton community.However,the unique characteristics such as diazotrophy and gas vacuoles of Trichodesmium made the situation advantageous,and they comprised the maximum cell abundance in this area especially in KW and the TWC.Temperature,DIP and P/N ratios appeared to be the major environmental drivers for Trichodesmium proliferation in the ECS during the study period. 相似文献
14.
Two surveys were performed for determining bacteria biomass (BB), temperature, salinity, chlorophyll a (chl-a) and nutrient concentrations at 11 stations with three sampling depths in the high-incidence regions of red tide in the East
China Sea (ECS) in the spring of 2006. Temperature and salinity increased from nearshore to offshore region and from high
latitude to low latitude in the two cruises of 2006. BB were between 0.3–5.2 mgC m−3 (about 2.1 mgC m−3 on average) and 0.2–6.0 mgC m−3 (about 2.7 mgC m−3 on average) respectively in the two cruises. BB in the surface layer decreased from the Changjiang River estuary to high
sea and from low latitude to high latitude. The results showed that bacterial growth was regulated by temperature, primary
production and inorganic nutrient concentrations depending on different hydrographic conditions. In the surface and middle
layers where the primary production can supply enough organic substrate, temperature was the main factor to control bacteria
biomass. BB showed a good correlation between the surface and middle layers in both cruises. The distribution of nutrients
during both cruises showed a similar decreasing trend from nearshore region and high latitude to offshore region and low latitude.
High BB values were mainly recorded from samples in the middle layer where chl-a concentrations were also high, indicating primary production being strongly correlated with temperature over the ECS shelf.
In the offshore area, phosphate and silicate became limiting factors for phytoplankton growth with indirect influence on BB.
Bacteria played an important role in nitrogen regeneration process turning organic nitrogen to inorganic forms such as NH4
+. The increasing ratio of NH4
+/DIN could be a proof of that. 相似文献
15.
The South China Sea (SCS), which is the largest marginal sea in the western tropical Pacific, plays an important role in regional climate change. However, the research on the phytoplankton community structure (PCS) response to the upwelling remains inadequate. In January 2014, the upwelling simulation experiment was performed in the western SCS. Results indicate that the nutrient-rich bottom water not only increased the total Chlorophyll a (Chl a) concentrations, but would potentially altered the PCS. Due to new nutrients added, microphytoplankton had more sensitivity response to nutrient uptake than other phytoplankton groups. The variation of nutrients induced by formation, weakening and disappearance of upwelling resulted in phytoplankton species succession from cyanophyta to bacillariophyta. It may be the leading factor of the changes in PCS and size-fractionated Chl a. The initial concentration of DIP less than 0.1 μmolL?1 could not sustain the phytoplankton growth. This indicates that phosphorus may be the limiting factor in the western SCS. 相似文献
16.
Study on the phytoplankton · in a large reservoir 总被引：3，自引：0，他引：3
A comprehensive study on the community structure and function of the phytoplankton in Taipinghu Reservoir, the largest reservoir
(9400 ha) in Anhui Province, China, was carried out during 1985–1986. A total of 175 species of algae belonging to 8 phyla
and 87 genera was noted. The composition of phytoplankton was dominated by species of Chlorophyta, Cyanophyta and Bacillariophyta.
The species number, cell density and biomass of the three groups were respectively 88%, 86.5% and 78.9% of the total phytoplankton.
The weighted annual average biomass was 1.52 mg/L and cell density was 1.43×106 ind/L. The growth maximum was observed in summer. Diatoms were abundant in the region adjoining a river. A large number of
flagellated algae such asEuglena andChromulina occurred in the artificial fish culture bay.
It can be inferred from the algal composition and total nitrogen concentration (1.48 mg/L) that this reservoir is a mesotrophic
water body that had undergone slight natural eutrophication.
Presented are an equation for the relation between cell density and biomass of algae and a newly developed method based on
the energy flow principle in ecology for theoretically estimating algal fishery potential. The algae volumes of 128 species
were measured for calculating the biomass. 相似文献
17.
Phytoplankton distribution and community structure in the East China Sea (ECS) continental shelf 总被引：2，自引：0，他引：2
ＩＮＴＲＯＤＵＣＴＩＯＮＰｈｙｔｏｐｌａｋｔｏｎｈａｓａｋｅｙｒｏｌｅｉｎｔｈｅｍａｒｉｎｅｅｃｏｓｙｓｔｅｍａｓｔｈｅｂａｓｉｃｐａｒｔｉｎｔｈｅｆｏｏｄｃｈａｉｎ ,ｗｈｉｃｈｉｓｉｍｐｏｒｔａｎｔｉｎｆｏｒｍａｔｉｏｎｆｏｒａｓｓｅｓｓｉｎｇｐｒｏｄｕｃｔｉｖｉｔｙｐｏｔｅｎｔｉａｌａｎｄｆｉｓｈｅｒｙｒｅｓｏｕｒｃｅｓ.Ｐｈｙｔｏｐｌａｎｋｔｏｎａｌｓｏｈａｓａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｔｈｅｃａｒｂｏｎｂｉｏｇｅｏｃｈｅｍｉｃａｌｃｙｃｌｅ,ｂｅｃａｕｓｅｉｔｃａｎａｂｓｏｒｂａｌａ… 相似文献
18.
Nutrient limitation is known to inhibit growth and metabolism and to alter elemental stoichiometric ratios in phytoplankton. In this study, physiological changes in Thalassirosira weissflogii were measured under different dissolved inorganic phosphate (DIP) regimes in semi-continuous cultures to revisit the utility of the Redfield ratio for assessing nutrient limitation. The results showed that cell size increased with decreasing DIP availability. In the P-depleted treatment (f/2-P) the cell size was 1.48 times larger than that in the P-limited (f/100) treatment and 2.67 times larger than that in the P-saturated treatment (f/2 and f/10). The fucoxanthin to chlorophyll a ratio (Fuco/chl a) was relatively stable (about 0.3) in P-saturated cultures and was 10 times higher than that in P-limited and P-depleted cultures. During the experimental period, the photosynthetic efficiency index, ?F/Fm′, was relatively stable at ~0.50 in the P-saturated cultures, but quickly declined with decreasing DIP availability. Although cellular P content showed a significant difference between the P-saturated culture (1.6 pg/cell) and the P-limited culture (0.7 pg/cell), the N/P ratio in T. weissflogii did not show a trend with DIP availability and fluctuated slightly around 25. Our results suggest that cell division in T. weissflogii is not strictly size-gated but is probably regulated by a biochemical, and hence, an elemental stoichiometric ratio threshold, and that deviation of the cellular N/P ratio from the Redfield ratio is not a reliable indicator of algal nutrient stress. 相似文献
19.
2007年7月对茂名市小东江的浮游生物及污染状况进行调查和分析,结果共检出浮游植物122种,其中蓝藻门15属34种,占(总种类数,下同)27.9%,硅藻门16属26种,占21.3%,绿藻门29属52种,占42.6%,裸藻门3属6种,占4.9%,金藻门1属1种,占0.8%,黄藻门3属3种,占2.5%;浮游动物78种,其中原生动物门26属36种,占46.2%,轮虫动物门9属16种,占20.5%,节肢动物门枝角类8属14种,占17.9%,桡足类10属11种,占14.1%,水生昆虫1属1种,占1.3%。各调查断面浮游植物的种类数平均为37种,细胞密度在11.3×104~19.5×104/L,Ⅴ断面最高,Ⅰ断面最低,平均为14.4×104/L;浮游动物种类数平均为27种,密度平均为2 895/L。相邻断面间Jaccard种类相似性指数范围为0.13~0.23,各断面环境异质性相差较大,该季节河水流动性小。叶绿素a含量为19.9~45.3μg/L,它与细胞密度呈显著的正相关,与无机氮、无机磷和COD均不存在明显的相关性。各断面的浮游植物多样性指数为3.1~4.5,均匀度为0.62~0.85;浮游动物的多样性指数为2.7~3.9,均匀度我0.59~0.80。对βm-αm指示种种类组成和群落结构分析,Ⅱ、Ⅲ、Ⅳ、Ⅴ断面水质属生态中污类型,而Ⅰ断面属生态寡污类型。以国家地表水质量标准评判,各断面COD含量为Ⅰ类水;无机氮含量除Ⅰ断面外,其他断面均为Ⅲ类水;无机磷含量均优于Ⅱ类水;石油类除Ⅰ、Ⅱ断面为Ⅳ类水外,其他断面均为Ⅴ类水。单因子污染指数分析表明,小东江流域水质为中污染至重污染之间。 相似文献
20.
A total of 348 species belonging to 8 phyla and 125 genera were observed in seasonally sampled phytoplankton of tidal rivers from 13 sampling sites around Luoyuan Bay, and all field samplings were carried out in productive period(March/June/August/December) at ebb tide. Bacillariophyta species were the most abundant species, followed by Chlorophyta, Cyanophytes, Euglenophyta, Cryptophyta, Dinophyta, Xanthophyta and Chrysophytas. Seasonal distribution index(SDI) value ranged from 0.63 to 0.86, which meant that species found at those sites in 4 seasons tended to be largely different. Phytoplankton individuals ranged from 5.939×10~4 ind L~(-1) in winter to 75.31×10~4 ind L~(-1) in autumn. Phytoplankton biomass ranged from 0.620 mg L~(-1) in summer to 2.373 mg L~(-1) in autumn. The grey correlation analysis(GCA) showed that the nutrient variables played an important role in the influence on phytoplankton community in every season. The canonical correspondence analysis(CCA) revealed impact of environmental variables on the different species, most of Bacillariophyta species were negative correlation with nutrients(TP and NH_3-N) in the four seasons, Chlorophyta species and Cyanophyta species did not show obvious correlation with environment variables in every season. The combination of GRA analysis and CCA analysis provided a method to quantitatively reveal the correlation between phytoplankton community and environmental variables in water body of tidal rivers at this region. 相似文献