Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 716, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.137109
Keywords
P. communis; S. alterniflora; Plant-derived OC; Original SOC dynamic; Tidal flat development
Categories
Funding
- National Natural Science Foundation of China [21876127]
- ChinaNational Key Research and Development Program [2017YFC0506004]
- Research Grants Council of the Hong Kong SAR, China [28300015, 18202116]
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Soil organic carbon (SOC) is both a product and a cause of soil development. Previous studies found that less carbon (C) is fixed by Phragmites communis than Spartina alterniflora in the Jiuduansha wetland of the Yangtze River Estuary. However, the P. communis zone presented higher contents of SOC and humus, which was mainly related to lower soil respiration (SR). It is not well known how different plants affect turnover of original SOC in the Jiuduansha wetland, and thus soil development and tidal flat evolution. In this study, in-field surveys and microcosm experiments were conducted to trace turnover of plant C and evaluate dynamics of SOC using stable C isotopic techniques. Spartina alterniflora decayed faster than P. communis, and more of its derived OC was lost through SR and leaching. Although S. alterniffora-derived OC suppressed the degradation of original SOC, it was consumed to a greater extent, making less supplementation to SOC. Phragmites communis-derived OC showed less degradability and accelerated the degradation of original SOC. but was more incorporated into new SOC and finally caused higher increase in SOC, specifically in bare tidal flat soil with poor original SOC. Overall, compared with S. alterniflora, P. communis-derived OC more effectively replaced the unstable original SOC. thereby improving the content and stability of SOC, especially for soil in early-development stages of tidal flats. (C) 2020 Elsevier B.V. All rights reserved.
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