农业环境科学学报2012，Vol.31Issue(4)：750-756,7.
污灌时间对土壤肥力及土壤酶活性的影响
Effect of Sewage Irrigation Time on Soil Fertility and the Enzyme Activity
摘要
Abstract
Sewage is widely used on agricultural soils in peri-urban areas of developing countries to meet the shortage of water resources. Although sewage is a good source of plant nutrients, it also increases the concentration of heavy metals in soils. Microbial responses to heavy metals may serve as early warning indicators of adverse effects of sewage irrigation on soil quality. The aim of the present work is to evaluate the effect of sewage irrigation time on soil fertility and the enzyme activity. Based on the methods of space instead of time, field investigation and sample analysis, several soil samples in the layer of 0～20 cm were collected and analyzed from seven soil sites(Sl～S7) where had been irrigated with sewage for 0, 16, 23, 25, 27, 32 a and 52 a, respectively in Lucheng town of Shijiazhuang. For each soil sample, we determined the concentrations of organic matter, total nitrogen, total phosphorus, cation exchange capacity, sucrase, urease, phosphatase, dehydrogenase and catalase. The results showed that the soils irrigated with sewage contained higher concentrations of organic matter, total nitrogen, total phosphorus, sucrase, urease and phosphatase than those irrigated with groundwater. For the cation exchange capacity, catalase and dehydrogenase, some soils irrigated with sewage exhibited higher concentrations than those irrigated with groundwater, while some soils irrigated with sewage exhibited lower concentrations than those irrigated with groundwater. The concentrations of total nitrogen, sucrase and phosphatase in soils were significantly correlated in a positive manner with sewage irrigation time, while the other indicators did not change significantly with time of sewage irrigation. The contents of fertility (organic matter and total nitrogen) and heavy metals( total Cr and total Cd) in soils were significantly correlated in a positive manner with the activities of hydrolase enzyme(urease and phosphatase), and the content of exchangeable Cr was significantly correlated in a negative manner with the activity of dehydrogenase enzyme. The results indicated that sewage irrigation could have significantly complex effects on soil fertility and the enzyme activity, and these effects had great impact on the yields of agricultural land in wastewater-irrigated fields.关键词
污水灌溉/土壤肥力/土壤酶活性/重金属Key words
sewage irrigation/ soil fertility/ enzyme activity of soil/ heavy metals分类
资源环境引用本文复制引用
郭晓明,马腾,崔亚辉,陈柳竹,杜鹏,廖媛..污灌时间对土壤肥力及土壤酶活性的影响[J].农业环境科学学报,2012,31(4):750-756,7.基金项目
国家重点基础研究发展规划(973)项目(2010CB428802) （973）
高等学校博士学科点专项科研基金(20110145110003) （20110145110003）
国家自然科学基金资助项目(40872157,40830748) （40872157,40830748）
教育部新世纪优秀人才支持计划资助项目(NCET-07-0773) （NCET-07-0773）
中央高校基本科研业务费专项资金资助(CCUGL100501) （CCUGL100501）
中国地质大学(武汉)研究生培养模式与教学改革研究计划(CUGYCXK0802) （武汉）
