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| Spatiotemporal distribution and stoichiometry characteristics of carbon, nitrogen and phosphorus in surface soilsof freshwater and brackish marshes in the Min River estuary |
| HU Min-jie1, REN Hong-chang1, ZOU Fang-fang2, REN Peng1, TONG Chuan1 |
1. Key Laboratory of Humid Sub-tropical Eco-geographical Process of the Ministry of Education, Research Centre of Wetlands in Subtropical Region, School of Geographical Sciences, Fujian Normal Universities, Fuzhou 350007, China;
2. Anxi Tea College, Fujian Agriculture and Forestry University, Fuzhou 350002, China |
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Abstract During October 2013 to August 2014, the spatiotemporal distribution and stoichiometry characteristics of carbon, nitrogen and phosphorus in surface soils from the freshwater and brackish Cyperus malaccensis marshes were measured in different seasons, and examined the key environmental factors controlling the variation of nutrient elements simultaneously in Min River estuary. The contents of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) in the freshwater and brackish marshes were greater variability, the ranges were (18.24~28.36, 1.44~2.24, 0.45~1.01)(14.96~26.19, 1.55~2.45, 0.67~1.18)g/kg, respectively. Overall, contents of SOC and TN showed increasing trends with depth in soil profiles, while TP exhibited decreasing gradually with depth in freshwater marsh. The nutrient element contents no significant vertical variation in the brackish marsh except TN. The average values of C/N、C/P and N/P in the freshwater and brackish marshes soils were 12.41±1.22,29.77±6.76,2.40±0.47 and 10.89±1.09,24.92±3.80,2.29±0.25, respectively. The ANOVA revealed that most element contents were significant spatial differences in two marshes. The values of SOC, TP, C/N and C/P in both freshwater and brackish marshes had a significant correlation with soil pH and conductivity, while there were not significant correlations with soil moisture and bulk density. The soil C/N was significantly correlated with silt and sand content. The soil C/N, C/P and N/P values were affected significantly by soil SOC, TN and TP. Spatiotemporal distributions of nutrient elements in two marshes were the result of the combined effects of multiple factors, such as hydrodynamics, exogenous input, vegetation production and human activity.
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Received: 28 June 2015
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