摘要
为了研究再生水灌溉对土壤次生盐渍化及重金属累积等土壤质量指标的影响,采用田间调查取样方法,在北京市典型再生水灌区(通州新河灌区),对再生水灌溉和井水灌溉的土壤进行采样分析.采用ICP-AES光谱仪测定土壤重金属(Cu、Ni、Pb、As、Cd、Zn)质量分数w、采用DX 600离子色谱仪测定盐离子(Ca2+、Mg2+、Na+、K+)质量分数w.结果表明,再生水灌区比井灌区土壤盐离子w显著增加,增加程度w(Na+)>w(K+)>w(Mg2+)>w(Ca2+),且土壤中Ca2+、Mg2+、Na+在土层>40～80cm、>140～180cm累积较多;再生水灌区与井灌区土壤浸提液的钠吸附比(SAR)垂向变化趋势一致,再生水灌区各取土层SAR显著高于井灌区,平均是井灌区的5～6倍,但仍处于作物适宜范围之内.尽管再生水灌区重金属(Cu、As、Ni、Pb、Zn)在土层>140～200cm略有累积,但仍符合土壤环境质量标准Ⅰ或Ⅱ级,且再生水灌区与井灌区在0～140cm的土壤重金属w差异并不显著.
With increasing shortage of water resources,more attention has been paid on the utilization of reclaimed water.As reclaimed water contains rich nutrients such as N and P,it has been widely used in irrigation.However,several studies have demonstrated that irrigating with reclaimed water might have bad effects on soil quality,such as soil secondary salinization and heavy metal accumulation.In order to analyze the influence of reclaimed water irrigation upon soil quality,a field experiment in the typical reclaimed water irrigation area（Xinhe irrigation area,Tongzhou District） was carried out in this study.The treated soils for sampling and analyzing were irrigated with reclaimed water and well water.Contents of heavy metal（Cu、Ni、Pb、As、Cd and Zn） were measured by ICP-AES spectrometer,while soil salty ion（Ca2＋、Mg2＋、Na＋ and K ＋） contents were tested by DX 600 ion chromatograph.Data showed that,soil irrigated with reclaimed water showed significant increase in salt ion contents than well irrigated soil,with an increasing order of w（Na＋）w（K＋）w（Mg2＋）w（Ca2＋）.Further,Ca2＋、Mg2＋、Na＋ accumulations at the depths of 40-80 cm and 140-180 cm were relatively critical.Vertical trends of sodium adsorption ratio（SAR） values of soil extraction were the same in districts irrigated with reclaimed water and well water.SAR values of reclaimed water irrigated soil were significantly higher than well irrigated soil,with an average of 5-6 times higher.But values were still in the suitable level for crops.Although heavy metals（Cu、As、Ni、Pb and Zn） slightly accumulated at the depth of 140-200 cm,values were still consistent with soil environmental standard grade of 1 and 2.Contents of soil heavy metal had no obvious differences between soils irrigated with reclaimed water and well water at the depth of 0-140 cm.
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第5期572-576,共5页
Journal of Beijing Normal University(Natural Science)
基金
中央高校基本科研业务费专项资金资助项目(2009SD-10)
关键词
再生水
灌溉
次生盐渍化
重金属
reclaimed water
irrigation
secondary salinization
heavy metal
