ZHANG Wen 1,2 LIU Xiaohuan 1,2 YIN Gang1 YAO Shuchun 3 ZHENG Hesong 4 ,KE Hua4 GUI Zhi fan1，2
(1. College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China;
2. Research Center for Resource Depletion and Urban Transformation and Development of Hubei Normal University,Huangshi 435002, China;
3. State Key Lab of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
4. Wanghu Lake Wetland Nature Reserve Administration of Huangshi City, Huangshi 435002, China)
Abstract:The release of endogenous phosphorus ( P ) from sediments often affects the lake eutrophication significantly. Here, the Standards, Measurements and Testing Programme ( SMT) based sequential extraction method was applied to quantify different forms of phosphorus in surface lake sediments of Wanghu, Daye, Cihu, Liangzi, Baoan and Zhupo lakes in eastern Hubei Province, to explore the P occurrence and bioavailability in the aforementioned lakes. The results show that (1) the total P ( TP) content in lake sediments in southeastern Hubei ranged from 395. 81 to 1 400 mg / kg. (2) The TP content was dominated by inorganic P ( IP) , accounting for 50% -90% of TP, followed by calcium-bound P (Ca-P, 94. 53-542. 85 mg / kg) , iron-aluminum-bound P ( Fe / Al-P, 44. 04-461. 90mg / kg) and organic P (OP, 22. 59-171. 27 mg / kg. (3) The TP content correlated significantly and positively with Fe / Al-P, Ca-P. Multiple comparisons revealed significant differences in P contents among the lakes investigated. Geological background, human activities, distribution of aquatic plants and hydrodynamic conditions in the basin are the major factors influencing the distribution of different P forms in lakes. 4) The contents of bioavailable P (BAP) were 68. 26-717. 3 mg / kg, which were lower than those of the Huayang Lake Group in the same region, but the spatial distribution of BAP in sediments was similar to Fe / Al-P. Based on the vertical distribution of Fe / Al-P along the sediment core and the occurrence of sediment phosphorus, the industrial and the agricultural sewage and fish farming activities were the prominent sources for endogenous P accumulated in sediments.
Key words：eastern Hubei province; lake sediment; phosphorus forms; bioavailability
EARTH AND ENVIRONMENT： Vol. 51, No. 5, Tot No.355 2023
