Experimental Study on Improvement of Sediment Layer and Its Promotion of Plant Growth in Dam Foundation Dammed Lake
Improving the sediment and promoting the growth of plants,achieving the effect of ecological restora-tion,realizing the resource utilization of sediment,and solving the problem of sediment stacking and occupying land are the focus and diffiiculty of the green development of water conservancy and hydropower industry.Through the ecological restoration experiment of disturbed area in hydropower project site,the improvement effect of 4 different amendments on the sediment layer of dam foundation dammed lake and their effects on the growth of common plants in natural environment,such as Dasiphora fruticose L.Ilex chinensis Sims,Zinnia ele-gans Jacq.,Medicago sativa L.,Lolium perenne L.,Festuca elata Keng ex E.B.Alexeev,were studied.The results showed that the physicochemical properties of the sediments supplemented with bovine and sheep manure,bio-char,fly ash and anionic polyacrylamide(PAM)were significantly better than those of natural topsoil(except pH),and the growth and survival ability of plants under natural conditions were significantly improved.Among them,the plant growth effect was the best in the group treated with cow and sheep manure and anionic PAM,which sig-nifiicantly increased the plant height of 6 species(1.3～3.3 times).Vegetation growth(plant height and germination rate)was significantly correlated with water content,alkali-hydrolytic nitrogen,total nitrogen,available phosphor-us,organic matter and cation exchange capacity(Mantel's P≤0.05).With the addition of different amendments,the water content,alkali-hydrolyzed nitrogen content,total nitrogen content,available phosphorus content,organic matter content and cation exchange capacity of the sediment at 0～10 cm depth were increased by 24％,30％,29％,23％,45％and 19％,respectively,which promoted the growth of plants.This study provides a new insight into the practical application of sediment in ecological restoration from the perspective of sediment improvement,and a new way to solve the problem of sediment resource utilization and green hydropower development.
sediment layer in dam foundation dammed lakesediment improvementanionic PAMcattle and sheep manureresource utilization
NETL
NSTL
万方数据
