[1]JIANG Yi,LI Yiqiu.Labile Organic Carbon of Different Land Use Patterns in Minjiang River Basin, Sichuan Province[J].Research of Soil and Water Conservation,2017,24(05):33-38.
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Labile Organic Carbon of Different Land Use Patterns in Minjiang River Basin, Sichuan Province
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 05
Page number:
33-38
Column:
Public date:
2017-10-28
- Title:
- Labile Organic Carbon of Different Land Use Patterns in Minjiang River Basin, Sichuan Province
- CLC:
- S718.5
- DOI:
- -
- Abstract:
- The Minjiang River Basin has great position for its ecology and geography. As an essential indicator of soil quality, soil labile organic carbon (SLOC) and its fractions play an important role in many soil chemical, physical and biological properties. A field experiment was conducted to determine the variation and influencing factors of SLOC under different land use patterns in the Minjiang River Basin. The results are as follows. The soil mechanical composition under different land use patterns was different, and the change trend of soil total porosity was contrary with the soil bulk density. The soil organic carbon, total nitrogen, total phosphorus and total potassium had the same change trends, which showed secondary forest and scrub-grassland higher than that of artificial forest and slope cropland, while the soil total phosphorus had no significant difference under different land use patterns (p > 0.05). SLOC under different land use patterns ordered secondary forest and scrub-grassland higher than that of artificial forest and slope cropland. SLOC declined with decreasing soil depth and showed a decline along the vertical soil profile with a ‘T’ shape distribution with the obvious ‘surface accumulation’. The highest ratio of SLOC/SOC of scrub-grassland, artificial forest and slope cropland was in 10—20 cm, while secondary forest was in 0—10 cm, and the lowest ratio of SLOC/SOC under different land use patterns was in 30—40 cm. Correlation analysis showed that SLOC had a significant difference with SOC, TN (p < 0.01), which indicated that SLOC was mainly depended on the organic carbon content to a large extent. In addition, the content of SOC was the important influencing factors under different land use patterns in the Minjiang River Valley. SLOC and the soil organic carbon presented extremely significant correlation (R2=0.996), which could be a better parameter to reflect the status of soil organic carbon pool in the Minjiang River Valley than soil total organic carbon content.
- References:
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1900-01-01