Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Nutrients in the Changjiang River.

Zhi-Liang Shen1, Qun Liu

  • 1Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. zhlshen@ms.qdio.ac.cn

Environmental Monitoring and Assessment
|May 20, 2008
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Spider-Inspired Ultrasensitive Flexible Vibration Sensor for Multifunctional Sensing.

ACS applied materials & interfaces·2020
Same author

Toxoplasma gondii metacaspase 2 is an important factor that influences bradyzoite formation in the Pru strain.

Parasitology research·2020
Same author

Positive effects of COVID-19 control measures on pneumonia prevention.

International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases·2020
Same author

Relationship between occupational aluminium exposure and histone lysine modification through methylation.

Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS)·2020
Same author

Ovarian cancer-excreted exosomal miR-199a-5p suppresses tumor metastasis by targeting hypoxia-inducible factor-2α in hypoxia microenvironment.

Cancer communications (London, England)·2020
Same author

Instrument response effects on the retrieval of oceanic lidar.

Applied optics·2020
Same journal

A study on greenhouse gas emissions from asphalt pavement cross-sections: a comparison between roadside and central areas.

Environmental monitoring and assessment·2026
Same journal

Biosensing application of microbial fuel cells for organic matter and copper ion monitoring in constructed wetlands.

Environmental monitoring and assessment·2026
Same journal

Microplastic accumulation in fish and water: a case study from a protected reservoir in a megacity.

Environmental monitoring and assessment·2026
Same journal

Environmental assessment of Pb mobility in mining tailings from Zaruma, Ecuador, mediated by a Bacillus safensis group strain: a central composite design and generalized additive modeling approach.

Environmental monitoring and assessment·2026
Same journal

Advancing CO<sub>2</sub> emission data quality in cement production through integrated material-, flue gas-, and 3D inventory-based monitoring.

Environmental monitoring and assessment·2026
Same journal

Floating microplastics in semi-enclosed Boka Kotorska Bay (southern Adriatic Sea).

Environmental monitoring and assessment·2026
See all related articles

Nutrient levels, particularly nitrogen, increased in the upper Changjiang River due to human activities. High nitrogen to phosphorus ratios suggest nutrient imbalances, with light limitation potentially controlling phytoplankton growth.

Area of Science:

  • Environmental Chemistry
  • River Ecology
  • Water Quality Assessment

Background:

  • Nutrient pollution is a growing concern in large river systems.
  • Understanding nutrient dynamics is crucial for managing aquatic ecosystems.

Purpose of the Study:

  • To investigate the distribution and forms of nitrogen (N), phosphorus (P), and silicon dioxide (SiO3-Si) in the Changjiang River.
  • To assess the impact of human activities on nutrient concentrations and ratios.
  • To provide baseline data before the operation of the Three Gorges Dam.

Main Methods:

  • Field sampling during dry and flood seasons in 1997-1998.
  • Chemical analysis of N, P, and SiO3-Si concentrations.
  • Molar ratio calculations for N and P.

Related Experiment Videos

  • Correlation analysis between nutrient concentrations and river runoff.

    • Main Results:

    • SiO3-Si showed even distribution; N and P concentrations increased in the upper reaches, indicating anthropogenic impact.
    • Dissolved N and particulate P were the dominant forms.
    • Extremely high dissolved N/P ratios (192.5-317.5) and lower particulate ratios (5.6-37.7) were observed.
    • Light limitation, not P limitation, likely controlled phytoplankton growth in turbid waters.
    • Increased N concentrations over decades, while P changes were less significant.
    • Nutrient fluxes were primarily driven by runoff, with tributaries contributing over half.

    Conclusions:

    • Human activities significantly impact nutrient loads in the Changjiang River, especially in the upper reaches.
    • High N/P ratios suggest potential eutrophication risks and shifts in aquatic ecosystem structure.
    • River runoff is a key factor controlling nutrient transport, with tributaries playing a major role.
    • This study provides essential ecological baseline data for assessing the Three Gorges Dam's environmental impact.