scholarly journals Spatiotemporal variations of hydrochemistry in karst dammed rivers and carbon fertilization effect of biological carbon pump: A case study of Pingzhai Reservoir and Lake Hongfeng in Guizhou Province

2020 ◽  
Vol 32 (6) ◽  
pp. 1683-1694
Author(s):  
HAN Cuihong ◽  
◽  
SUN Hailong ◽  
WEI Yu ◽  
BAO Qian ◽  
...  
Keyword(s):  
Guizhou Province ◽  
Spatiotemporal Variations ◽  
Carbon Pump ◽  
Fertilization Effect ◽  
Carbon Fertilization ◽  
Biological Carbon Pump

scholarly journals Effects of iron limitation on carbon balance and photophysiology of the Antarctic diatom Chaetoceros cf. simplex

Polar Biology ◽  
2021 ◽  
Author(s):  
Deborah Bozzato ◽  
Torsten Jakob ◽  
Christian Wilhelm ◽  
Scarlett Trimborn
Keyword(s):  
Oxygen Evolution ◽  
Photochemical Quenching ◽  
Gross Photosynthesis ◽  
Manganese Zinc ◽  
C Cycle ◽  
Uptake Rates ◽  
Carbon Pump ◽  
Non Photochemical Quenching ◽  
The Antarctic ◽  
Biological Carbon Pump

AbstractIn the Southern Ocean (SO), iron (Fe) limitation strongly inhibits phytoplankton growth and generally decreases their primary productivity. Diatoms are a key component in the carbon (C) cycle, by taking up large amounts of anthropogenic CO2 through the biological carbon pump. In this study, we investigated the effects of Fe availability (no Fe and 4 nM FeCl3 addition) on the physiology of Chaetoceros cf. simplex, an ecologically relevant SO diatom. Our results are the first combining oxygen evolution and uptake rates with particulate organic carbon (POC) build up, pigments, photophysiological parameters and intracellular trace metal (TM) quotas in an Fe-deficient Antarctic diatom. Decreases in both oxygen evolution (through photosynthesis, P) and uptake (respiration, R) coincided with a lowered growth rate of Fe-deficient cells. In addition, cells displayed reduced electron transport rates (ETR) and chlorophyll a (Chla) content, resulting in reduced cellular POC formation. Interestingly, no differences were observed in non-photochemical quenching (NPQ) or in the ratio of gross photosynthesis to respiration (GP:R). Furthermore, TM quotas were measured, which represent an important and rarely quantified parameter in previous studies. Cellular quotas of manganese, zinc, cobalt and copper remained unchanged while Fe quotas of Fe-deficient cells were reduced by 60% compared with High Fe cells. Based on our data, Fe-deficient Chaetoceros cf. simplex cells were able to efficiently acclimate to low Fe conditions, reducing their intracellular Fe concentrations, the number of functional reaction centers of photosystem II (RCII) and photosynthetic rates, thus avoiding light absorption rather than dissipating the energy through NPQ. Our results demonstrate how Chaetoceros cf. simplex can adapt their physiology to lowered assimilatory metabolism by decreasing respiratory losses.

scholarly journals A Case Study on Soundscape Analysis for the Historical and Ethnic Village of Dong Nationality in Zhaoxing County

Acoustics ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 221-234
Author(s):  
Zhiyong Deng ◽  
Kexin Dong ◽  
Danfeng Bai ◽  
Kaicheng Tong ◽  
Aili Liu
Keyword(s):  
Sound Pressure ◽  
Subjective Experience ◽  
Guizhou Province ◽  
Music Listening ◽  
Ethnic Music ◽  
Curve Fit ◽  
Sound Event ◽  
Sound Environment ◽  
Independent Variable

A soundscape is a sound environment of the awareness of auditory perception and social or cultural understandings. Based on a soundscape investigation in 2019 in the historical and ethnic village of Dong Nationality in Zhaoxing County, Guizhou Province of China, a case study on the soundscape analysis with the acoustical sound pressure level and an impressive sound event or soundmark is introduced in this paper. Furthermore, in order to determine the subjective soundscape experience and its influence by the length of background music listening, the independent variable “Length of Listening” and six adjective pairs, such as “Monotonous” to “Rich”, “Clamorous” to “Quiet”, “Stressing” to “Relaxing”, “Boring” to “Vivid”, “Noisy” to “Musical” and “Disliked” to “Preferable” are chosen to obtain a curve-fit, which shows that the length of the music listening background has a higher correlation to the subjective experience, and no sufficient attention has been paid to the context of the traditional soundscape preservation, ethnic music and quiet and soft ambient sounds.

High-spectral-resolution lidar for ocean biological carbon pump studies

2016 ◽  
Author(s):  
Dong Liu ◽  
Yudi Zhou ◽  
Yongying Yang ◽  
Peituo Xu ◽  
Zhongtao Cheng ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Carbon Pump ◽  
High Spectral Resolution Lidar ◽  
Biological Carbon Pump

scholarly journals Promoting sustainable development of poverty-alleviation policies based on high-quality cultural tourism by digital economy — A case study of Chishui City in Guizhou Province

2021 ◽  
Vol 251 ◽  
pp. 02015
Author(s):  
Fawen Yang ◽  
Cheng Yang ◽  
Qian Xie
Keyword(s):  
Poverty Alleviation ◽  
Development Trend ◽  
Cultural Tourism ◽  
Digital Economy ◽  
Guizhou Province ◽  
Moore’S Law ◽  
Moore's Law ◽  
Study Case ◽  
The Development Trend

Digital economy follows three laws — the Metcalfe’s law. the Moore’s law. and the Davidow effect, which are practically in line with China’s poverty-alleviation initiative by developing cultural tourism. The Moore’s law, however, is paradoxical in given contexts, and thus, we proposed the “reverse-Moore’s law” to analyze the current cultural tourism-based poverty-alleviation policies. The features of digital economy can be employed to support the cultural tourism-based poverty-alleviation work: the development trend of digital economy also coincides with China’s cultural tourism-based poverty alleviation initiatives. With the poverty-alleviation work at Chishui City in Guizhou Province as the study case, this paper made an analysis from the perspective of digital economy to confirm the practical and surreal significance of applying digital economy to China’s poverty alleviation endeavors.

scholarly journals Bentho‐Pelagic Decoupling: The Marine Biological Carbon Pump During Eocene Hyperthermals

2021 ◽  
Vol 36 (3) ◽  
Author(s):  
Elizabeth M. Griffith ◽  
Ellen Thomas ◽  
Angela R. Lewis ◽  
Donald E. Penman ◽  
Thomas Westerhold ◽  
...  
Keyword(s):  
Marine Biological ◽  
Carbon Pump ◽  
Biological Carbon Pump
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