Turnover Rate of Soil Organic Matter and Origin of Soil 14 Co 2 in Deep Soil from a Subtropical Forest in Dinghushan Biosphere Reserve, South China
Bibliographic Data
| ID | 9244153 |
|---|---|
| Authors | P Ding, C D Shen, N Wang (0000-0002-2955-7588), W X Yi, X F Ding, D P Fu, K X Liu, L P Zhou (0009-0006-7154-9000) |
| Year | 2010 |
| Volume | 52 |
| Issue | 3 |
| Pages | 1422-1434 |
| Publication date | 2010-01-01 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Radiocarbon (JOURNAL) |
| Journal identifiers | ISSN: 0033-8222 • E-ISSN: 1945-5755 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.1017/s0033822200046506 |
| OpenAlex | W2200972004 |
| Language | EN |
| Citations received | 3 |
| References cited | 37 |
This paper examines the carbon isotopes ( 13 C, 14 C) of soil organic carbon (SOC) and soil CO 2 from an evergreen broadleaf forest in southern China during the rainy season. The distribution of SOC δ 13 C, and SOC content with depth, exhibits a regular decomposition of SOC compartments with different turnover rates. Labile carbon is the main component in the topsoil (0–12 cm) and has a turnover rate between 0.1 and 0.01 yr –1 . In the middle section (12–35 cm), SOC was mainly comprised of mediate carbon with turnover rates ranging between 0.01 and 0.025. Below 35 cm depth (underlayer section), the SOC turnover rate is slower than 0.001 yr –1 , indicating that passive carbon is the main component of SOC in this section. The total production of humus-derived CO 2 is 123.84 g C m –2 yr –1 , from which 88% originated in the topsoil. The middle and underlayer sections contribute only 10% and 2% to the total humus-derived CO 2 production, respectively. Soil CO 2 δ 13 C varies from –24.7‰ to –24.0‰, showing a slight isotopic depth gradient. Similar to soil CO 2 δ 13 C, Δ 14 C values, which range from 100.0‰ to 107.2‰, are obviously higher than that of atmospheric CO 2 (60–70‰) and SOC in the middle and underlayer section, suggesting that soil CO 2 in the profile most likely originates mainly from SOC decomposition in the topsoil. A model of soil CO 2 Δ 14 C indicates that the humus-derived CO 2 from the topsoil contributes about 65–78% to soil CO 2 in each soil gas sampling layer. In addition, the humus-derived CO 2 contributes ∼81% on average to total soil CO 2 in the profile, in good agreement with the field observation. The distribution and origin of soil 14 CO 2 imply that soil CO 2 will be an important source of atmospheric 14 CO 2 well into the future
Chronosequence · Humus · Soil carbon · Soil horizon · Soil organic matter · Soil water · Topsoil · Total organic carbon · Chemistry · Climate change and permafrost · Environmental Science · Geology and Paleoclimatology Research · Soil Carbon and Nitrogen Dynamics · Environmental Chemistry · Soil Science
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| Citations per year | 0.23 |
|---|---|
| Citation span | 2013 - 2021 (9) |
| Highly cited | No |