Carbon biomass, carbon-to-chlorophyll a ratio and the growth rate of phytoplankton in Jiaozhou Bay, China

2021 ◽  
Author(s):  
Shujin Guo ◽  
Zengxia Zhao ◽  
Junhua Liang ◽  
Juan Du ◽  
Xiaoxia Sun
Keyword(s):  
Growth Rate ◽  
Chlorophyll A ◽  
Jiaozhou Bay ◽  
Biomass Carbon ◽  
Carbon Biomass

Carbon biomass, carbon-to-chlorophyll a ratios and growth rates of phytoplankton in Jiaozhou Bay, China

2021 ◽  
Author(s):  
Shujin Guo ◽  
Xiaoxia Sun
Keyword(s):  
Chlorophyll A ◽  
Growth Rates ◽  
Water Samples ◽  
Jiaozhou Bay ◽  
Phytoplankton Growth ◽  
Biomass Carbon ◽  
Carbon Biomass ◽  
Four Seasons ◽  
Carbon Based ◽  
Phytoplankton Cells

<p>Carbon biomass, carbon-to-chlorophyll a ratio (C:Chl a) values and growth rates of phytoplankton cells were studied during four seasonal cruises in 2017 and 2018 in Jiaozhou Bay, China. Water samples were collected from twelve stations, and phytoplankton carbon biomass (phyto-C) was estimated from microscope-measured cell volumes. Phyto-C ranged from 5.05 to 78.52 μg C/L (mean 28.80 μg C/L) in the bay, and it constituted a mean of 38.16% of the total particulate organic carbon in the bay. High phyto-C values always appeared in the northern or northeastern bay. Diatom carbon was predominant during all four cruises. Dinoflagellate carbon contributed much less (<30%) to the total phyto-C, and high values always appeared in the outer bay. The C:Chl a of phytoplankton cells varied from 11.50 to 61.45 (mean 31.66), and high values appeared in the outer bay during all four seasons. The phyto-C was also used to calculate the intrinsic growth rates of phytoplankton cells in the bay, and phytoplankton growth rates ranged from 0.56 to 1.96 day<sup>-1</sup>; the rate was highest in summer (mean 1.79 day<sup>-1</sup>), followed by that in fall (mean 1.24 day<sup>-1</sup>) and spring (mean 1.17 day<sup>-1</sup>), and the rate was lowest in winter (mean 0.77 day<sup>-1</sup>). Temperature and silicate concentration were found to be the determining factors of phytoplankton growth rates in the bay. To our knowledge, this study is the first report on phytoplankton carbon biomass and C:Chl a based on water samples in Jiaozhou Bay, and it will provide useful information for studies on carbon-based food web calculations and carbon-based ecosystem models in the bay.</p>

Shellfish Aquaculture Management of Jiaozhou Bay, Yellow Sea Coast of China - An Ecological-Economic Modeling Approach

2012 ◽  
Vol 616-618 ◽  
pp. 1647-1653 ◽  
Author(s):  
Ning Yu ◽  
Mao Jian Wang ◽  
Zhen Bo Lu ◽  
Fan Li ◽  
Ming Liang Zhang
Keyword(s):  
Growth Rate ◽  
Jiaozhou Bay ◽  
Economic Modeling ◽  
Market Model ◽  
Shellfish Aquaculture ◽  
Modeling Approach ◽  
Long Run ◽  
Price Growth ◽  
Aquaculture Management ◽  
Capita Income Growth

In order to better manage shellfish aquaculture, a fifty-year variability in shellfish production in Jiaozhou Bay was quantitatively simulated with the Modeling Approach to Resource economics decision-maKing in EcoaquaculTure (MARKET) which is a scenario-testing tool linking economic and ecological analyses. Four scenarios were defined to assess the model sensitivity to per capita income growth rate, price growth rate and maximum cultivation area. Results indicate that the MARKET model follows the expected trends regarding the economic theory. And the shellfish supply is limited by the maximum cultivation area in the long run. However, a lower demand does not imply a corresponding decrease in net profit. Although price growth can make up for a partial loss caused by the reduction of available cultivation area, the compensatory measure cannot guarantee the increasing net profits of farmers in the long term. The information provides important implications for aquaculture management in the context of resource decline.

Effects of metsulfuron-methyl on aquatic plant (Lemna gibba L.) and recovery from after prolonged exposure under rice cropping conditions

2013 ◽  
Author(s):  
Raja Rajeswari ◽  
Atmakuru Ramesh
Keyword(s):  
Growth Rate ◽  
Chlorophyll A ◽  
Aquatic Plant ◽  
Prolonged Exposure ◽  
Lemna Gibba ◽  
Chlorophyll B ◽  
Total Carotenoid ◽  
Metsulfuron Methyl ◽  
Control Value ◽  
Reliable Assessment

The effects and potential recovery of aquatic plant Lemna gibba exposed to a sulfonyl urea herbicide metsulfuron-methyl (MSM) for 120 days under rice cropping condition was investigated. The frond number was decreased by day 15 at the concentration 11 µg/L and 100% inhibition on growth rate of Lemna was observed. Continuous decrease of frond number by day 50 at below the detectable level of residues exhibited symptoms (chlorosis) of MSM toxicity. Toxicity was assessed on the basis of toxicity index (TI) value, growth rate, yield and pigment contents (chlorophyll, carotene, total carotenoid and xanthophyll) of treated samples compared with untreated control. The observed value of 0.698 µg/g chlorophyll a, 0.263 µg/g chlorophyll b, 0.147 µg/g carotene, 1.620 µg/g total carotenoid and 1.473 µg/g xanthophyll contents in treated samples was statistically significantly different from control value of 4.366 µg/g chlorophyll a, 3.132 µg/g chlorophyll b, 0.796 µg/g carotene, 17.755 µg/g total carotenoid and 16.937 µg/g xanthophyll contents by day 50 samples. After prolonged exposure, growth rate, yield and pigment content for the treated samples recovered to control levels on day 120. The obtained data indicate the application of aquatic plant Lemna gibba as sensitive biomarker of water quality as well as the significance of selected biological parameters in the reliable assessment of toxic potential of MSM under rice cropping condition.

The increasing aluminum content affects the growth, cellular chlorophyll a and oxidation stress of cyanobacteria Synechococcus sp. WH7803

2015 ◽  
Vol 44 (3) ◽  
Author(s):  
Rongjun Shi ◽  
Gang Li ◽  
Linbin Zhou ◽  
Jiaxing Liu ◽  
Yehui Tan
Keyword(s):  
Growth Rate ◽  
Chlorophyll A ◽  
Aluminum Content ◽  
Oxidation Stress ◽  
Chl A ◽  
Antioxidant Mechanism ◽  
Synechococcus Sp

AbstractEffects of marine aluminum (Al) on phytoplankton are controversial, making it important to elucidate the mechanisms underlying Al effects. This study was aimed at identifying the effects of Al on the growth, chlorophyll a (chl a) content and the antioxidant mechanism of cyanobacteria Synechococcus sp. WH7803. The growth rate increased from 0.33 to 0.52 d-1 in media with the increasing Al concentration from 0.2 (control) to 20 μmol l

scholarly journals Effect of nicosulfuron on chlorophyll content of marandu-grass cultivated in crop-forest-livestock integration systems

2020 ◽  
pp. 1876-1882
Author(s):  
Evander Alves Ferreira ◽  
Marcia Vitória Santos ◽  
Leandro Diego da Silva ◽  
Priscila Júnia Rodrigues da Cruz ◽  
Raul Ribeiro Silveira ◽  
...  
Keyword(s):  
Growth Rate ◽  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Dry Matter ◽  
Agroforestry Systems ◽  
Chlorophyll B ◽  
Total Chlorophyll ◽  
Integration System ◽  
Total Chlorophyll Content ◽  
Urochloa Brizantha

The aim of this work was to study the effect of sub-doses of herbicide nicosulfuron on the levels of chlorophyll and growth of marandu-grass in an forest-livestock integration system. The treatments consisted of eucalyptus consortium with sorghum (BRS 655 hybrid) and forage Urochloa brizantha cv. Marandu (marandu-grass) at 12×2 and 12×3 m spacings in agroforestry systems, in addition to sorghum + marandu-grass and marandu-grass in monoculture. The doses of nicosulfuron applied at the marandu-grass were 0, 15 and 30 g ha-1. At 30 and 120 days after the application of nicosulfuron, chlorophyll a and chlorophyll b were measured usinf a portable chlorophyll meter, with six measurements per plant. Afterwards, the total chlorophyll content and chlorophyll a/b were calculated. We also measured the mass of the total dry matter of marandu-grass and growth rate of the culture. Marandu-grass plants cultivated in monoculture showed higher quantities of chlorophyll and the highest growth rates. The levels of chlorophyll a, b and chlorophyll a/b and the growth rate of marandu grass were similar between systems integrated with eucalyptus (12x2 and 12x3 m). The increase of herbicide dose negatively influenced on chlorophyll content in marandu-grass in all treatments evaluated. The use of nicosulfuron in doses of 25 and 50 g L-1 reduced the growth rate of marandu grass only when grown in monoculture

scholarly journals Biomass Carbon Content in Schima- Castanopsis Forest of Midhills of Nepal: A Case Study from Jaisikuna Community Forest, Kaski

2018 ◽  
Vol 6 (4) ◽  
pp. 72-83
Author(s):  
Sushma Tripathi ◽  
Chandra Bahadur Thapa ◽  
Amrit Sharma ◽  
Ganesh Paudel
Keyword(s):  
Carbon Content ◽  
Leaf Litter ◽  
Carbon Stock ◽  
Total Biomass ◽  
Biomass Carbon ◽  
Community Forest ◽  
Community Forests ◽  
Carbon Biomass ◽  
Below Ground

Community forests of Nepal’s midhills have high potentiality to sequester carbon. This paper tries to analyze the biomass carbon stock in Schima-Castanopsis forest of Jaisikuna community forests of Kaski district, Nepal. Forest area was divided into two blocks and 18 sample plots (9 in each block) which were laid randomly. Diameter at Breast Height (DBH) and height of trees (DBH≥5cm) were measured using the DBH tape and clinometer. Leaf litter, herbs, grasses and seedlings were collected from 1*1m2 plot and fresh weight was taken. For calculating carbon biomass is multiplied by default value 0.47. The AGTB carbon content of Chilaune, Katus and other species were found 19.56 t/ha, 18.66 t/ha and 3.59 t/ha respectively. The AGTB of Chilaune dominated, Katus dominated and whole forest was found 43.78 t/ha, 39.83 t/ha and 41.81 t/ha respectively. Carbon content at leaf litter, herbs, grasses and seedlings was found 2.73 t/ha. Below ground biomass carbon at whole forest was found 6.27 t/ha. Total biomass and carbon of the forest was found 108.09 t/ha and 50.80 t/ha respectively. Difference in biomass and carbon content at Chilaune dominated block and Katus dominated block was found insignificant. This study record very low biomass carbon content than average of Nepal's forest but this variation in carbon stock is not necessarily due to dominant species present in the forest. Carbon estimation at forest of different elevation, aspect and location are recommended for further research. International Journal of EnvironmentVolume-6, Issue-4, Sep-Nov 2017, page: 72-84

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