The effects of sulfur amendments on the geochemistry of sulfur, phosphorus and iron in the mangrove plant (Kandelia obovata (S. L.)) rhizosphere.
P (phosphorus) and Fe (iron) are limiting elements and S (sulfur) is an important element of the biogeochemical cycle in the mangrove environment. To assess the effects of sulfur on the geochemical cycling of Fe and P at the sediment-plant interface, the speciation distributions of Fe, P and S in sediments were examined. The data showed that higher proportions of amorphous Fe, Fe-bound phosphate, chromium reducible sulfur and elemental sulfur were found in the rhizosphere, while more crystalline Fe, exchangeable phosphate and acid-volatile sulfide were determined in the non-rhizosphere. Sulfate application induced an increase in the Ex-P concentration, high P accumulation and high iron plaque deposition in the roots. In conclusion, sulfate applications had a significant influence on the geochemical cycling of Fe and P in the sediments. It significantly curtailed the Fe and P limit to plant growth and enhanced plant resistance to the rugged surroundings in mangrove.
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China; Institute of Environment and Ecology, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
Li
L
Jian
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China.
Yu
Y
Junyi
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China. Electronic address: liujingchun@xmu.edu.cn.
Liu
L
Jingchun
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China.
Yan
Y
Chongling
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China.
Lu
L
Haoliang
Department of Geography, Queen Mary, University of London, London E1 4NS, UK.
Kate L
KL
Spencer
D002681:China; D065928:Forests; D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000032:analysis*; D010710:Phosphates / Q000032:analysis; D010758:Phosphorus / Q000032:analysis*; D018517:Plant Roots / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development; D043982:Rhizophoraceae / Q000737:chemistry / Q000187:drug effects* / Q000254:growth & development; D058441:Rhizosphere; D013440:Sulfides / Q000032:analysis; D013455:Sulfur / Q000032:analysis / Q000737:chemistry*; D053833:Wetlands
D010710:Phosphates; D013440:Sulfides; D010758:Phosphorus; D013455:Sulfur; D007501:Iron
Iron; Mangrove; Phosphorus; Rhizosphere; Sulfur