Journal
SUSTAINABILITY
Volume 14, Issue 24, Pages -Publisher
MDPI
DOI: 10.3390/su142416875
Keywords
carbon sequestration; active SOC pool; slow SOC pool; straw return rate; paddy soils
Funding
- National Natural Science Foundation of China
- Key Research and Development Project of Jiangxi Province
- Key Research and Development Project of Jiangxi Academy of Sciences
- Project of Outstanding Young Scientist of Science and Technology Innovation of Jiangxi Province
- [41867002]
- [20202BBFL63048]
- [2020-YZD-27]
- [20192BCB23026]
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This study investigates the effects of straw return on different organic carbon pools and finds that the C-s pool is more sensitive to long-term straw return.
To identify the effects of straw return on different organic carbon pools in surface paddy soils (0-20 cm), a total of 33 soil samples under different annual straw return rates (SRr) was collected, and then the samples were analyzed based on a 100-day incubation. The data from acid hydrolysis-incubation experiments were fitted to a three-pool first-order kinetics model that divided soil organic carbon (SOC) into active (C-a), slow (C-s) and resistant (C-r) pools. The results showed that the mean pool sizes of C-a, C-s, and C-r were 0.27, 10.26, and 13.46 g center dot kg(-1), representing a mean of 1.35%, 41.91%, and 56.74% of the total SOC (TOC), respectively. The SOC pools in the surface paddy soils in Dongxiang had a small C-a pool but had longer mean residence times of the C-a and C-s pools than those in other regions in China. The three carbon pools were less affected by the paddy soil type but showed obvious spatial variations. The SRr contributed a strong positive effect on the variability of C-s and C-r, especially on C-s variability, while it had very little effect on C-a variability. Soil available nitrogen dominated the variability in TOC and C-r compared to the other soil properties. Therefore, the C-s pool is more sensitive than the other carbon pools to long-term straw return.
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