%0 Journal Article
%T Contents and Movement of Phosphorus in Soil of Long Term Effluent Irrigated Land Forest<br>长期污水灌溉后林地土壤中磷的含量与移动
%A HU Hui-rong
%A WANG Hai-long
%A Mark Kimberley
%A <br>胡慧蓉
%A 王海龙
%A Mark Kimberley
%J 环境科学
%D 2010
%I 
%X Treated sewage effluent from Rotorua City, New Zealand, has been spray-irrigated into Whakarewarewa Forest to minimize effluent-derived nitrogen (N) and phosphorus (P) entering Lake Rotorua. To assess the capacity of the ecosystem to assimilate the effluent derived nutrients, a long term field trial was established within the Rotorua land treatment system. The objective of this study was to determine the accumulation, redistribution and movement of P in the volcanic soil after 11year effluent irrigation. The soil samples were analyzed. Soil pH, total phosphorus (TP), Olsen P, Mehlich-3 P(M3P), M3Ca and M3Mg had increased significantly (p<0.05) in the top soil (0-10cm) in all effluent treated plots compared with the control plots. Some significant increase had extended deeper soil layer (20-40cm) or much deeper soil layer. Most effluent-derived P had accumulated in top 40cm. Concentrations of soil Olsen P and M3P in the medium and high effluent treatments were over environmental threshold levels(Olsen P, 60 mg·kg-1; M3P, 150 mg·kg-1) in the top 20cm. The values of soil saturation ratio (M3PSR) show that it was nearly saturated of soil P sorption in top soil. It was suggested that there was a potential environment crisis for soil P to move downward with drainage water. Regular soil sampling and Olsen P measurement using 60 mg·kg-1 as an environment threshold could provide a solution for monitoring the movement of P down the soil profile. Phosphorus saturation ratio index (M3PSR) calculated as the molar ratio of M3P to (M3Al + M3Fe) appeared to be inadequate as an indicator for downward movement of soil P in such land treatment system. A new Phosphorus saturation ratio index for this system will be one of future study work.
%K 污水灌溉
%K 林地
%K 磷的移动
%K 磷饱和率
%K 环境临界值
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=DBC860FEA9160848C95F420DFFF5F97B&yid=140ECF96957D60B2&vid=4AD960B5AD2D111A&iid=5D311CA918CA9A03&sid=3B99442D3C631650&eid=D1DB94C1649032D3&journal_id=0250-3301&journal_name=环境科学&referenced_num=1&reference_num=0