Author(s)

Chao Wang, Zhenhan Li

Corresponding Author

Chao Wang

ABSTRACT

The water-level fluctuation zone of reservoir is active in material migration and transformation. The release of nitrogen and phosphorus after soil flooding may cause eutrophication risk to reservoir water. Vegetation restoration is a common means of ecological restoration in water-level fluctuation zone of reservoirs, but there is still a lack of quantitative understanding of the inhibitory effect of vegetation on the release of nitrogen and phosphorus. Taking farmland soil in the water-level fluctuation zone of Danjiangkou Reservoir as the object, three typical plants (Vetiveria zizanioides, Cynodon dactylon and Artemisia Lavandulaefolia) were chosen to study the release of nitrogen and phosphorus in soil under waterlogging conditions and the effects of different plants on nutrient flux at the water-soil interface. The results showed that the three plants had good inhibition effect on soil nitrate release, and the average inhibition flux was 115 mg/m2/d of Vetiveria zizanioides, 49 mg/m2/d of Artemisia Lavandulaefolia, and 25 mg/m2/d of Cynodon dactylon, respectively. The three plants had no obvious inhibition effect on the release of ammonium nitrogen and total phosphorus. The average inhibitory flux of ammonium nitrogen was 5.5 mg/m2/d of Vetiveria zizanioides, 2.2 mg/m2/d of Cynodon dactylon and 0.02 mg/m2/d of Artemisia Lavandulaefolia. The average inhibitory flux of total phosphorus was 1.2 mg/m2/d of Vetiveria zizanioides, 2.6 mg/m2/d of Cynodon dactylon and 0.8 mg/m2/d of Artemisia Lavandulaefolia. The results can provide reference for species selection in the ecological restoration of water-level fluctuation zone in Danjiangkou Reservoir.

KEYWORDS

Vetiveria zizanioides, Cynodon dactylon, Artemisia Lavandulaefolia, nutrient release, Danjiangkou Reservoir