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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (10): 8-15.doi: 10.11707/j.1001-7488.20141002

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Soil Carbon Sequestration and Its Relationship with Soil pH in Qinglangang Mangrove Wetlands in Hainan Island

Guo Zhihua1, Zhang Li1,2, Guo Yanru1, Wen Wanyu1, Cao Meng1, Guo Julan1, Li Zhiyong2   

  1. 1. Institute of Wetland Research, CAF Beijing 100091;
    2. Henan University of Science and Technology Luoyang 471003
  • Received:2014-05-16 Revised:2014-07-18 Online:2014-10-25 Published:2014-11-12

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Abstract:

Mangrove ecosystems play an important role in carbon sequestration. A survey was carried out along two transects of mangroves in Qinglangang, Hainan Island, where the most typical mangrove community in China is distributed. This study aimed at evaluating site effect on carbon sequestration and its relationship with pH. One of the transects was located in a site far away from the sea (more than 500 m), the other near the sea (less than 100 m). Along each transect, three soil columns (seaward, interior, landward) were withdrawn using a PVC pipe. Each soil column was separated into sections of 5 cm interval. Soil samples from each section were analyzed for carbon content and pH. The main results are as follows. The pH of mangrove soil far from sea ranged from 4.9 to 6.2, compared with a much higher pH of around 8.0 near sea. The SOC content in the soil far from sea ranged from (9.1±1.08) g·kg-1 to (66.2 ±5.17) g·kg-1, with an average soil depth of about 85 cm. The SOC content increased with soil depth until 60-70 cm, then the SOC decreased. Along each transect, the SOC content decreased with the distance away from sea. The SOC contents of seaward, interior, landward were (36.76±3.04) g·kg-1, (35.12 ±3.78) g·kg-1, (17.20±1.56) g·kg-1, respectively. There was significant difference in SOC content between seaward site and landward site. The change patterns of the mangrove SOC far from sea in Qinglangang were consistent with that of Yap and Palau mangrove in Micronesia.The SOC content of transect near sea ranged from 8.35±0.94 g·kg-1 to (38.3±2.53) g·kg-1, with an average depth of about 60 cm. The SOC content generally decreased with depth but with a small peak at 40cm. Average SOC contents of seaward, interior, landward were (22.12±2.57) g·kg-1, (14.83±1.01) g·kg-1, (13.18±1.20) g·kg-1, respectively.The SOC content was significantly different between seaward and landward sites. The SOC content of all samples had significant negative relationship with the soil pH.

Key words: mangrove, soil organic carbon sequestration, soil pH, Qinglangang

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