Lyu Sidan, Chen Weiping
State Key Laboratory for Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Sci Pollut Res Int. 2016 Mar;23(5):4639-49. doi: 10.1007/s11356-015-5693-y. Epub 2015 Nov 3.
Reclaimed water is widely used for landscape irrigation with the benefits of saving fresh water and ameliorating soil quality. Field samples were collected from seven parks in Beijing irrigated reclaimed water with different irrigation history in 2011 and 2014 to evaluate the long-term impacts of reclaimed water irrigation on soil quality. Soil quality index method was used to assess the comprehensive effects of reclaimed water irrigation on soil. Results showed that the effects of reclaimed water irrigation on the soil nutrient conditions were limited. Compared with tap water irrigation, soil salinity was significantly higher in 2011, while the difference was insignificant in 2014; soil heavy metals were slightly higher by 0.5-10.6 % in 2011 and 2014, while the differences were insignificant. Under reclaimed water irrigation, soil biological activities were significantly improved in both years. Total nitrogen in reclaimed water had a largest effect on soil quality irrigated reclaimed water. Soil quality irrigated with reclaimed water increased by 2.6 and 6.8 % respectively in 2011 and 2014, while the increases were insignificant. Soil quality of almost half samples was more than or closed to soil quality of natural forest in Beijing. Soil quality was ameliorated at some extent with long-term reclaimed water irrigation.
再生水因具有节约淡水和改善土壤质量的优点而被广泛用于景观灌溉。2011年和2014年从北京七个使用再生水灌溉且灌溉历史不同的公园采集了田间样本，以评估再生水灌溉对土壤质量的长期影响。采用土壤质量指数法评估再生水灌溉对土壤的综合影响。结果表明，再生水灌溉对土壤养分状况的影响有限。与自来水灌溉相比，2011年土壤盐分显著更高，而2014年差异不显著；2011年和2014年土壤重金属含量略高0.5 - 10.6%，但差异不显著。在再生水灌溉下，两年的土壤生物活性均显著提高。再生水中的总氮对使用再生水灌溉的土壤质量影响最大。2011年和2014年使用再生水灌溉的土壤质量分别提高了2.6%和6.8%，但增幅不显著。近一半样本的土壤质量超过或接近北京天然林的土壤质量。长期再生水灌溉在一定程度上改善了土壤质量。
