再生污水绿地灌溉生态效应研究进展

水资源短缺已成为制约我国经济及环境发展的重大问题,然而大量的绿地仍然在采用井水或自来水进行灌溉,造成了巨大的浪费,同时也加重了城市的用水危机。开辟城市第二水资源——再生水来灌溉绿地是解决这一矛盾的新途径。但由于再生污水水质的特殊性,使得其在作为一种宝贵肥源的同时,也产生了许多负面的效应。为此,提出了今后需要加强研究的几个问题:(1)加强干旱半干旱地区再生(污)水绿地灌溉可行性的理论和实践研究;(2)筛选出特定区域适合于一定水质标准之下的灌溉的植物种;(3)深入研究不同地区气候、土壤、植物之间的关系,进一步探讨适合于该区域的合理的灌溉技术体系和灌溉方式,并建立合理的评价体系。

Progress in research on ecological effects of irrigating grassland with reclaimed water

Problems of water shortage have badly restricted the economic and environmental development.While there are still vegetations irrigated with drinking water or ground water,not only resulting in enormous waste but also strengthening the crisis of urban water shortage.Reclaimed water,as a new second water source,has been an important measurement approved to solve the contradiction.But due to the inferior water quality,irrigation with reclaimed water leads to many negative effects,although abundant nutrient elements.Based on the literatures,we may pay attention to the following problems:(1) researches on theories and practices must be strengthened in the aridity and semi-aridity regions.(2) selecting plant species adaptable to reclaimed water under a certain standard of water quality;(3)the relationship among climate,soil and plants for different regions should be investigated carefully,then reasonable irrigation techniques and irrigation methods will be more discussed,reasonable evaluation system should be established.All mentioned above may be the important things.