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| Effects of Spartina alterniflora invasion on soil organic carbon in the Phragmites australis estuary wetlands of Minjiang River |
| Wang Baoxia1,2,Zeng Congsheng1,2,3,Chen Dan1,Wang Weiqi1,2,3,Zhang Linhai1,2 |
| 1.School of Geographical Sciences,Fujian Normal University;2.Research Centre of Wetlands in Subtropical Region,Fujian Normal University;3.Institute of Geography,Fujian Normal University: 350007,Fuzhou,China |
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Abstract Shanyutan Wetland is the largest estuarine wetland in the Minjiang River estuary area.Soil samples of Phragmites australis and Spartina alterniflora in the Shanyutan Wetland were collected.The soil organic carbon contents,storages in the soil profiles and impact factor were measured and studied.The results indicated that the mean value of soil organic carbon content in rhizospheric soil(0 to 60cm) under Phragmites australis and Spartina alterniflora were 15.54 and 17.16g/kg respectively and the organic carbon content in the surface(0-10cm)were the highest,19.69 and 22.02g/kg respectively.The total value of organic carbon storages in rhizospheric soil(0 to 60cm) under Phragmites australis and Spartina alterniflora were 6794.20 and 8231.48t/km2 respectively.The organic carbon storages in the soil layer of 30-40cm under Phragmites australis is the highest,while the highest value of that under Spartina alterniflora emerges in the soil layer of 0-10cm. The invasion of Spartina alterniflora had increased rhizospheric soil organic carbon contents and storages of the wetland of indigenous Phragmites australis.The rhizospheric soil organic carbon content had a significant positive relationship with the moisture content and soil salinity.Considering the invasion of Spartina alterniflora,the author give some suggetions for the management of estuary wetlands of Minjiang River.
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Received: 03 March 2010
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