ADVERTISEMENT

Understanding Landscape, Habitat, And Reservoir Operation Influences On Riparian Vegetation Along The Three Gorges Reservoir

Although “dam fever” has come down in developed countries since the 1980s (Graf, 1999), the fever continues in developing countries (Grumbine and Pandit, 2013). By 2013, China had built 98,000 hydroelectric dams of various sizes compared with just 40 small ones up to the late-1940s (Yang and Lu, 2014). The hydropower plants contribute to reducing fossil-fuel consumption and associated air and environmental pollution and promote China’s economic growth. However, the dam alters the original hydraulic regime and consequently causes a series of environmental and ecological challenges in the region.

For the Three Gorges Dam, claimed as China’s as well as the world’s biggest dam and biggest power plant, one of the challenges is reservoir operation caused new riparian zones (Fig. 1). It has gained wide attention from public and government agencies because of the flooding magnificence and obvious landscape degradation. Its water levels are operated between 145m during summer and 175m above sea level (above sea level) during winter. This seasonally-flooded land has an area of 348.9 km2, most of which encompasses good alluvial soil and was previously used for agriculture (43.7%) and forest/grass (35.9%).

ADVERTISEMENT
Fig. 1 Left: An example of TGR riparian zones (the red line indicates the highest flooding level; yellow line shows the lowest. The width and area of the riparian zones depend on the slop grade.); right: Location of study area and sample sites (this Image republished with permission from Elsevier from https://www.sciencedirect.com/science/article/pii/S1470160X18302930)

Great opportunities exist to improve such riparian ecosystem by restoration of vegetation. But this should be based on deep understanding of current existing vegetation and key influential factors across different scales. Our study, therefore, sampled the main part of the mainstream and one of largest tributaries of the Yangtze River and examined riparian plant community composition and structure and their responses to surrounding landscapes, habitat quality, and reservoir management (three groups of influences) in the TGR.

Based on quantitative ecology methods, we found 150 vascular plant species belonging to 130 genera of 56 families. Most species are annual herbaceous, confirming that our study area is severely disturbed and at an early succession stage. The low and medium-slop of the riparian zone have relatively fewer species while the high zone with more diverse species and community types. Overall, vegetation responses were very different across the analyzed scales. At the site-scale, landscape influence was most important in structuring communities. However, habitat (e.g. soil nitrogen, organic matter, etc.) and reservoir flooding (e.g. flood duration and frequency, etc.) influences have more impacts at the community-scale.

Our study found a complex relationship between landscape, environment and riparian vegetation. These results would help ecosystem managers and policymakers to develop multi-scale and location-specific approaches in restoring riparian ecosystems.

Published by Chundi Chen

Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences

These findings are described in the article entitled Complex effects of landscape, habitat and reservoir operation on riparian vegetation across multiple scales in a human-dominated landscape, recently published in the journal Ecological Indicators (Ecological Indicators 94,1 (2018) 482-490). This work was conducted by Chundi Chen et al. from the Chinese Academy of Sciences.

ADVERTISEMENT

References:

  1. Graf, W. L. (1999). Dam nation: A geographic census of American dams and their large‐scale hydrologic impacts. Water resources research, 35(4), 1305-1311.
  2. Grumbine, R. E., Pandit, M. K. (2013). Threats from India’s Himalaya dams. Science, 339(6115), 36-37.
  3. Yang, X., Lu, X. (2014). Drastic change in China’s lakes and reservoirs over the past decades. Scientific Reports, 4, 6041-6041.
  4. Chundi, C., Maohua, M., Shengjun, W., Junsong, J., Yuncai, W. (2018). Complex effects of landscape, habitat and reservoir operation on riparian vegetation across multiple scales in a human-dominated landscape. Ecological Indicators, 94, 482-490.

Comments

READ THIS NEXT

My Science Life: Vice President Arthur Ellis – University Of California Office Of The President

Welcome to the My Science Life feature of Art Ellis, the vice president for research and graduate studies at the […]

Toward A 3D Metamorphic Touchpad

Published by Shantonu Biswas California NanoSystems Institute, University of California, Santa Barbara These findings are described in the article entitled […]

Patient Preference And Timing For Exercise In Breast Cancer Care

Treatments for cancer vary and depend on many individual factors. However, there is one universal recommendation for cancer patients: avoid […]

Asteroid 1991 VG: Certainly Peculiar But Definitely Not Alien

When small (about 10 meters or 33 feet) near-Earth asteroid (NEA) 1991 VG was discovered in 1991, it was the […]

Record Low Voltage Losses In Efficient Cascade Organic Solar Cells

The sun is a limitless energy source, and photovoltaics is the most commonly used technology for converting solar energy into […]

Solar Photoactive Materials For Hydrogen Generation And Water Treatment

Solar photoactive material like TiO2 has a wide range of applications. It can be used in photovoltaic (PV) cells, hydrogen […]

Not All Watersheds Are Created Equal: Natural Boundaries Also Predict Patterns Of Inequality

Patterns of inequality in exposure to environmental pollutants exist around the world today, even right here in our backyards. Such […]

Science Trends is a popular source of science news and education around the world. We cover everything from solar power cell technology to climate change to cancer research. We help hundreds of thousands of people every month learn about the world we live in and the latest scientific breakthroughs. Want to know more?