关键词: CO₂浓度增高, 土壤水解酶, 土壤氧化还原酶, 酶活性

Abstract: Sediment samples were collected from the Luoyang Estuary of Quanzhou Bay, Fujian Province, and their total phosphorus (TP), exchangeable phosphorus (D-P), phosphorus bound to Fe/Al oxides (Fe/AlP), phosphorus bound to calcium (Ca-P), organic phosphorus (OP), and occluded phosphorus (Re-P) weredetermined, aimed to study the vertical distribution patterns of the P forms, their correlations, and environmental indication significances. The TP in the sediments was dominated by inorganic phosphorus (IP) (76%-89%). All the phosphorous forms except DP had similar vertical distribution pattern, i.e., decreased with sediment depth, and more concentrated in surface layer, indicating that the distribution of TP and phosphorus forms in the sediments was obviously affected
 by human activities. Correlation analysis showed that Ca-P was the main factor controlling TP and IP, there were significant correlations between TP and phosp
horus forms except DP, and organic matter had definite effects on the distribution of phosphorus forms. The contents of TP and all phosphorus forms, and the rat
ios of Fe/Al-P, Ca-P, and OP to TP in the same sediment layers presented obvious change, illustrating that water conservancy and seabed reclamation had great effects on the sediment environment and the transfer and transformation of phosphorus forms.

Key words: Free-air CO₂ enrichment(FACE), Soil hydrolase, Soil oxidoreductase, Enzyme activity