Post-flooding disturbance recovery promotes carbon capture in riparian zones
<p>Vegetation, water, and carbon dioxide have complex interactions on carbon mitigation in vegetation–water ecosystems. As one of the major global change drivers of carbon sequestration, flooding disturbance is a fundamental but poorly discussed topic to date. The aquatic and associated ripari...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2023-04-01
|
| Series: | Biogeosciences |
| Online Access: | https://bg.copernicus.org/articles/20/1357/2023/bg-20-1357-2023.pdf |
| Summary: | <p>Vegetation, water, and carbon dioxide have complex
interactions on carbon mitigation in vegetation–water ecosystems. As one of
the major global change drivers of carbon sequestration, flooding
disturbance is a fundamental but poorly discussed topic to date. The aquatic
and associated riparian systems are highly dynamic vegetation–water carbon
capture systems driven by fluvial processes such as flooding. However, their
global carbon offset potential is largely unknown. This study examines daily
<span class="inline-formula">CO<sub>2</sub></span> perturbations under flooding disturbance in the river (fluvial
area) and associated riparian areas with 2 year in situ observations along
the Lijiang. We find that, though the submerged riparian area behaved
as a carbon source during the flooding season (<span class="inline-formula">CO<sub>2</sub></span> flux: 2.790 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M3" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">g</mi><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="47pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="87d3355337ab5aa113f75741ca9d5949"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-20-1357-2023-ie00001.svg" width="47pt" height="15pt" src="bg-20-1357-2023-ie00001.png"/></svg:svg></span></span>), the riparian area and the fluvial area as a
whole transformed from a carbon source in pre-flooding season (1.833 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M4" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">g</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="47pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="3e89477f7519a516b0295bd8cc3fbab7"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-20-1357-2023-ie00002.svg" width="47pt" height="15pt" src="bg-20-1357-2023-ie00002.png"/></svg:svg></span></span>) to a carbon sink after recovery in
post-flooding season (<span class="inline-formula">−</span>0.592 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M6" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">g</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="47pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="49531a2214f5f53e1e3bd328ce90b8a0"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-20-1357-2023-ie00003.svg" width="47pt" height="15pt" src="bg-20-1357-2023-ie00003.png"/></svg:svg></span></span>). The fluvial
area sequestered carbon (<span class="inline-formula">−</span>0.619 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M8" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">g</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="47pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="413a4704a6a1039135a0d6851c9343f3"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-20-1357-2023-ie00004.svg" width="47pt" height="15pt" src="bg-20-1357-2023-ie00004.png"/></svg:svg></span></span>) in
post-flooding season instead of releasing carbon as in pre-flooding season
(2.485 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">g</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="47pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="756a597cf5f59d3f750d4da41d50dcbd"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-20-1357-2023-ie00005.svg" width="47pt" height="15pt" src="bg-20-1357-2023-ie00005.png"/></svg:svg></span></span>). Also, the carbon sequestration
capacity of the riparian area was enhanced in post-flooding season
(pre-flooding season: <span class="inline-formula">−</span>0.156 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M11" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">g</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="47pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="9ff2f512053c4d0a7c6f6d864a8e0fcc"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-20-1357-2023-ie00006.svg" width="47pt" height="15pt" src="bg-20-1357-2023-ie00006.png"/></svg:svg></span></span>, post-flooding
season: <span class="inline-formula">−</span>0.500 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M13" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">g</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="47pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="cb43a188c95fe696e3461dcd2324554f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-20-1357-2023-ie00007.svg" width="47pt" height="15pt" src="bg-20-1357-2023-ie00007.png"/></svg:svg></span></span>). We suggest that post-disturbance
recovery of riparian vegetation played a vital role in this transformation,
due to its stronger carbon uptake capacity after recovery from the flooding
disturbances. The findings shed light on the quantitative modelling of the
riparian carbon cycle under flooding disturbance and underlined the
importance of the proper restoration of riparian systems to achieve global
carbon offset.</p> |
|---|---|
| ISSN: | 1726-4170 1726-4189 |