The Spearman correlations among env

The Spearman correlations among environmental variables and
hydrologic variables in estuary, midstream and upstream were
presented in Table 2. Water temperature (Temp) was negatively correlated
with water level (WL) and positively correlated with water
flow in all sampling regions. Relative stability of the water column
(RWCS) was negatively correlated with WL too in all sampling regions
and positively correlated with water flow in the midstream. Euphotic
zone (Zeu) and light availability (Zeu/Zmix) were markedly
affected by the flow of the Yangtze River mainstream (Flow-Y) and
by the inflow of the Daning River (Flow-D) in the estuary and in the
upstream, respectively. Turbidity (Turb) in the midstream and upstream
was negatively correlated with WL and positively correlated
with water flow.
3.3. Phytoplankton dynamics
We identified 63 algal genera from seven major taxonomic categories,
and 17 functional groups were classified including the 32 descriptor
taxa (Table 3). The phytoplankton biomass in the upstream reach
remained low throughout the year, whereas phytoplankton biomass
in both midstream and estuary peaked in June and August (Fig. 5). Furthermore,
the phytoplankton biomass in the upstream was lower
during the flood season and higher during the dry season, than the biomass
in the midstream and estuary (Fig. 5).
There were marked seasonal variations in representation of each of
the 11 main functional groups of phytoplankton (>10% of the total biomass)
(Fig. 6). The Y, MP, LO and C functional groups were the main
contributors to the biomass in the Daning River, mainly represented by
large Cryptomonas spp., the meroplanktonic diatoms, the dinoflagellate
Peridiniosis niei, and the small diatom Cyclotella meneghiniana, respectively.
Groups B (Cyclotella sp. and Aulacoseira spp.) and D (Synedra spp.)
were important contributors to biomass in flood season.
In the estuary, the phytoplankton community during the flood season
was dominated by Y, MP, LO and C; in August biomass peaked and
was dominated by group D (60.2%), and during the dry season the community
was dominated by group C (mean 44.5%). In the midstream, the
flood season was dominated by functional groups Y and Lo, and during
the dry season biomass of group LO decreased while groups C and MP
increased. In the upstream, the phytoplankton community during the
flood season was dominated by the MP group when the water level
was low, at the beginning of the dry season, group LO was very dominant
(95.6%), and then during the dry season, group Y dominated in
the upstream with the water bodies becoming clear and stagnant.
The Spearman correlations among chlorophyll a concentration
(Chl.a) of phytoplankton and 11 environmental variables in estuary,
midstream and upstream of the Daning River were presented in
Table 4. Chl.a concentration in the estuary was negatively correlated
with WL and positively correlated with water temperature. In the
midstream, Chl.a concentration was negatively correlated with WL
and Zeu, and positively correlated with RWCS, water temperature,
Turb, DO, pH and TP. In the upstream, Chl.a concentration was negatively
correlated with RWCS and Turb, and positively correlated with
WL, Zeu/Zmix, Zeu, DO, pH and N–NO3.
The biomass of main functional groups were significantly correlated
(pb0.01) with most of the environmental factors, such as WL, RWCS,
Zeu/Zmix, Temp, Zeu, DO and nutrients (Table 5). The biomass of
groups Y and LO, were negatively correlated with WL and positively correlated
with RWCS, and temperature. In contrast, the biomass of groups
MP and D were positively correlated with turbidity and negatively correlated
with Zeu/Zmix and Zeu

ผลลัพธ์ (ไทย) 1:

ความสัมพันธ์ Spearman ระหว่างตัวแปรด้านสิ่งแวดล้อม และตัวแปรอุทกวิทยาในปาก กลางแม่น้ำและต้นน้ำแสดงในตารางที่ 2 อุณหภูมิของน้ำ (ชั่วคราว) เป็นความสัมพันธ์ในเชิงลบน้ำ (WL) และความสัมพันธ์เชิงบวกกับน้ำขั้นตอนในการสุ่มตัวอย่างทุกภูมิภาค ความมั่นคงของคอลัมน์น้ำ(RWCS) ถูกความสัมพันธ์ในเชิงลบกับ WL เกินไปในการสุ่มตัวอย่างทุกภูมิภาคและมีความสัมพันธ์เชิงบวกกับกระแสน้ำในการลำเลียง Euphoticโซน (Zeu) และงานแสง (Zeu/Zmix) ได้อย่างเด่นชัดผลกระทบจากการไหลของแม่น้ำแยงซีกระแสหลัก (กระแส Y) และโดยการไหลเข้าของน้ำต้าห (ไหล-D) ปากแม่น้ำ และในการต้นน้ำ ตามลำดับ ความขุ่น (Turb) ในการลำเลียง และต้นน้ำมีความสัมพันธ์ในเชิงลบกับ WL และความสัมพันธ์เชิงบวกมีการไหลของน้ำ3.3. แพลงก์ตอนพืช dynamicsเราระบุ 63 สาหร่ายสกุลจากประเภทอนุกรมวิธานหลักเจ็ดและกลุ่ม functional 17 ถูกจัดรวมทั้งบอก 32เหลือง (ตาราง 3) แพลงก์ตอนพืชชีวมวลในต้นน้ำถึงยังคงต่ำตลอดทั้งปี ในขณะที่แพลงก์ตอนพืชชีวมวลในกลางแม่น้ำและปากแม่น้ำแหลมในเดือนมิถุนายนและสิงหาคม (5 รูป) นอกจากนี้แพลงก์ตอนพืชชีวมวลในต้นน้ำถูกล่างใน ช่วงฤดูน้ำท่วม และยิ่งในช่วงฤดูแล้ง มากกว่าชีวมวลในกลางแม่น้ำและปากแม่น้ำ (5 รูป)มีถูกทำเครื่องหมายเปลี่ยนตามฤดูกาลเป็นตัวแทนของแต่ละกลุ่มงานหลักที่ 11 ของแพลงก์ตอนพืช (> 10% ของชีวมวลรวม)(Fig. 6). The Y, MP, LO and C functional groups were the maincontributors to the biomass in the Daning River, mainly represented bylarge Cryptomonas spp., the meroplanktonic diatoms, the dinoflagellatePeridiniosis niei, and the small diatom Cyclotella meneghiniana, respectively.Groups B (Cyclotella sp. and Aulacoseira spp.) and D (Synedra spp.)were important contributors to biomass in flood season.In the estuary, the phytoplankton community during the flood seasonwas dominated by Y, MP, LO and C; in August biomass peaked andwas dominated by group D (60.2%), and during the dry season the communitywas dominated by group C (mean 44.5%). In the midstream, theflood season was dominated by functional groups Y and Lo, and duringthe dry season biomass of group LO decreased while groups C and MPincreased. In the upstream, the phytoplankton community during theflood season was dominated by the MP group when the water levelwas low, at the beginning of the dry season, group LO was very dominant(95.6%), and then during the dry season, group Y dominated inthe upstream with the water bodies becoming clear and stagnant.The Spearman correlations among chlorophyll a concentration(Chl.a) of phytoplankton and 11 environmental variables in estuary,midstream and upstream of the Daning River were presented inTable 4. Chl.a concentration in the estuary was negatively correlatedwith WL and positively correlated with water temperature. In themidstream, Chl.a concentration was negatively correlated with WLand Zeu, and positively correlated with RWCS, water temperature,Turb, DO, pH and TP. In the upstream, Chl.a concentration was negativelycorrelated with RWCS and Turb, and positively correlated withWL, Zeu/Zmix, Zeu, DO, pH and N–NO3.The biomass of main functional groups were significantly correlated(pb0.01) with most of the environmental factors, such as WL, RWCS,Zeu/Zmix, Temp, Zeu, DO and nutrients (Table 5). The biomass ofgroups Y and LO, were negatively correlated with WL and positively correlatedwith RWCS, and temperature. In contrast, the biomass of groupsMP and D were positively correlated with turbidity and negatively correlatedwith Zeu/Zmix and Zeu