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Substantial decrease in CO2 emissions from Chinese inland waters due to global change.

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|March 20, 2021
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Carbon dioxide (CO2) emissions from China's inland waters significantly decreased over three decades due to environmental changes. This decline in CO2 evasion impacts the global carbon cycle and China's carbon budget.

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Area of Science:

  • Environmental Science
  • Climate Change Research
  • Carbon Cycle Studies

Background:

  • Inland waters are crucial for the global carbon cycle, but the long-term impact of global change on carbon dioxide (CO2) emissions remains unclear.
  • Understanding CO2 fluxes from diverse aquatic ecosystems is essential for accurate global carbon budgeting.

Purpose of the Study:

  • To quantify seasonal and annual CO2 emission fluxes from Chinese inland waters over the past three decades.
  • To investigate the influence of global change on CO2 emissions from streams, rivers, lakes, and reservoirs in China.
  • To identify the drivers behind observed changes in CO2 evasion from Chinese inland waters.

Main Methods:

  • Analysis of seasonal and annual CO2 fluxes from various inland water bodies across China.
  • Quantification of changes in CO2 emissions over a thirty-year period (1980s to 2010s).
  • Assessment of environmental alterations, including reservoir construction and reforestation, as potential drivers of emission changes.

Main Results:

  • CO2 emissions from Chinese inland waters decreased from 138 ± 31 Tg C yr-1 in the 1980s to 98 ± 19 Tg C yr-1 in the 2010s.
  • This reduction is attributed to the conversion of rivers to reservoirs and widespread reforestation programs.
  • Conversely, CO2 emissions from Tibetan Plateau inland waters showed an increase, linked to enhanced terrestrial carbon delivery and climate change impacts.

Conclusions:

  • Environmental changes in China have led to a significant decrease in inland water CO2 emissions, impacting the national carbon budget.
  • The findings highlight the complex interplay between land use, climate change, and aquatic carbon cycling.
  • Chinese inland waters play a substantial role in offsetting terrestrial carbon sinks, underscoring their importance in carbon budget assessments.