JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (4): 608-619.doi: 10.11849/zrzyxb.20150425

• Resource Evaluation • Previous Articles     Next Articles

Change of Soil Organic Carbon with Different Years of Spartina alterniflora Invasion in Wetlands of Minjiang River Estuary

JIN Bao-shi1, 2, GAO Deng-zhou1, YANG Ping1, WANG Wei-qi1, ZENG Cong-sheng1   

  1. 1.School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;
    2. School of Resources and Environment Science, Anqing Teachers College, Anqing 246011, China
  • Received:2015-04-20 Revised:2015-09-11 Online:2016-04-28 Published:2016-04-28
  • Supported by:
    National Basic Science Fund for Fostering Talents, No.J1210067; National Natural Science Foundation of China, No.31000262; Foundation of the Education Department of Fujian Province, China, No.JA13081; Program for Innovative Research Team of Fujian Normal University, No.IRTL1205

Abstract: The Minjiang River estuarine wetlands is an important tidal wetland ecosystem in Southeast China, as it locates at the boundary between mid and southern subtropical climate zones. The exotic C4 grass Spartina alterniflora was found in Minjiang River estuary in 2002, and since then it had rapidly replaced native plants and become one of the dominant vegetation types in the Shanyutan wetland. Plant invasions could change the quantity and quality of the soil organic carbon (SOC) pool, and thus have potential impacts on ecosystem function and global carbon cycling. In order to understand the carbon sequestration potential of Spartina alterniflora, we investigated SOC, soil organic carbon density (SOCD), soil organic carbon stock (SOCS) and soil physico-chemical properties at 0-60 cm depth of Spartina alterniflora wetlands with Y4 (﹤4 a), Y8 (4-8 a) and Y12 (8-12 a) chronosequence using space instead of time method. SOC of Y4, Y8 and Y12 in the Spartina alterniflora wetlands in the Shanyutan ranged between 14.34-16.95, 16.92-20.18 and 17.34-23.5 g·kg-1, respectively with mean values of 15.5, 17.77 and 19.71 g·kg-1. SOCD of Y4, Y8 and Y12 of ranged between 9.59-12.08, 11.31-13.11 and 13.94-16.08 kg·m-3, respectively with mean values of 10.68, 12.29 and 15.01 kg·m-3. The SOCS in 0-60 cm were 65.24, 73.99 and 90.30 t·hm-2, respectively. What’s more, the SOC in the surface soil of 0-20 cm increased significantly as invasion years extended. Soil C/N, clay and silt composition all increased with invasion years, while soil bulk density and sand composition decreased. SOC was influenced by many factors. The high positive correlation between SOC and C/N suggests that they mainly derive from terrigenous organic matters. Furthermore, SOC and soil moisture, salinity, pH, mean grain size, clay fraction were significantly positively correlated, while negatively correlated with bulk density and sand fraction. They played an important role in determining SOC through affecting microbial activity. Our results suggested that the increase of SOC in the Spartina alterniflorawetland in the short-term possibly due to the large amount of input litter biomass and lower decompo-sition. Spartina alterniflora has strong ability of accumulating organic carbon and effectively enhanced the carbon storage in the estuary wetland.

Key words: Minjiang River estuary, soil organic carbon, Spartina alterniflora, years of invasion

CLC Number: 

  • S153.6