| Through the site investigation in Guilin Botanical Garden, the research of lawn ecosystem irrigated with reclaimed water
has been carried out, and the spatial~temporal variation of soil physicochemical properties due to the reclaimed water irrigation has been studied. The result indicated as following: Temporally, there's no obvious variation of the content of organic matter and total nitrogen in every soil layer; in the 0~30 cm soil layer, there's relatively small change in the content of soil available phosphorus, while that change was relatively big in 30 ~60 cm soil layer; in 0~15cm soil layer, the change of total salt content was comparatively small and that change was relatively big in 15~60 cm soil layer. Spatially, in each soil layer the content of organic matter, total nitrogen, total phosphorus, and total salt in the soil irrigated with reclaimed water were all higher than that in the soil irrigated with clear water. The irrigation with
reclaimed water did have remarkable or extremely remarkable influences on the content of organic matter, total nitrogen, total phosphorus,rapid available phosphorus, rapid available potassium, total salt, K+, Na+, Ca2+ and Cl-, however, there's no remarkable influences on the bulk density, rapid available nitrogen, pH, Mg2+, NO3--N and NH4+-N. Compare with fresh water irrigation, reclaimed water containing nitrogen, phosphorus, potassium and other nutrients and organic matter, which will promote plant growth and improve soil fertility, at the same time, it will enhance the total salt content of soil, so the corresponding measures should be taken to avoid salt harm. |
