Title: Effects of Vallisneria natans on the occurrence characteristic of phosphorus fractions in sediment
Abstract: Lake eutrophication is a global environment problem.Phosphorus exchanging at the water-sediment interface plays a key role in eutrophication process.We cultured Vallisneria natans in a 4.0 m × 7.0 m × 1.5 m concrete tank under a natural state which water exchanges all the time by replacing overlying water frequently.Different phosphorus fractions in sediment were determined to reveal their response to V.natans from the beginning of planting to the end of growth stage.In this experiment condition,V.natans went through two growth stage and the results show that V.natans significantly reduced total phosphorus( TP) through promoting the mineralize of organophosphates( Org-P) and resolve of calcium phosphorus( Ca-P).TP reduced 78.79 mg / kg which account for 8.44% of initial content.Org-P reduced 49.99 mg / kg that contribute 62.67% for decreasement of TP.On the other hand,a portion of iron / aluminum phosphorus( Fe / Al-P) were absorbed for the request of the plant growth,2.99 and 4.10 mg / kg decreased,respectively,but occluded phosphate( Oc-P) was not affected.While V.natans grown to the highest biomass,it promote settlement of organic matter and formation of Fe-P and Oc-P,increment of which were 14.82 and 101.53 mg / kg,respectively.It also resulted in a Al-P content increase of 7.39%.In a word,V.natans make the phosphorus in water transfer into sediment.The result indicates that effect of V.natans on the leading direction of phosphorus transformation varies with different growth stages.Highly reactive phosphorus was absorbed and accumulated in plant as stable fraction during rapid growth stage,while absorption capacity of sediment increased during slow growth stage,exhibiting a promoted phosphorus settlement.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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