摘要
污水灌溉是污水资源化利用的一个重要途径。该研究以草坪草的污水灌溉为例 ,选用了高羊茅、黑麦、早熟禾等 3种典型的冷季型草坪草为主要试验草种 ,以地下滴灌和渗灌为 2种灌水方式 ,以城市居民小区的生活污水经过沙过滤和沉淀处理的出水和自来水为 2种灌溉水源 ,共设 12个试验处理 ,进行了污水灌溉和清水 (自来水 )灌溉的田间对比试验研究 ,探讨了污水灌溉对土壤与植株氮含量的影响。实验结果表明 ,污水灌溉使草坪草根系层 (0～ 30 cm土层 )土壤中的全氮、速效氮和铵态氮的含量低于清水灌溉 ;与此相反 ,污水灌溉可使草坪草根系层及其以下土层硝态氮明显高于清水灌溉。污水灌溉也导致草坪草的植株中全氮的含量比清水灌溉平均高 4 8%。两种污水灌溉方式下 ,土壤全氮、速效氮和铵态氮的含量差异不明显。但与滴灌相比 ,污水渗灌的土壤硝态氮的含量高于污水滴灌的情况 ,尤其是 15～ 30 cm和 30～ 4 5 cm土层 。
Irrigation with treated effluent is one of the most important aspects of utilization of effluent as an available water resources. Experiment was conducted for investigating the effect of irrigation with treated effluent on nitrogen contents in soil and turfgrass. Three typical different turfgrass species and two irrigation methods (subsurface drip irrigation and subsurface irrigation with porous pipe) were adopted in the experiment with treated effluent and potable water, which was 12 treatments totally. Before the irrigation, the source of domestic effluent is treated by a special facility which includes a sand filter with volume of 2 m×1.5 m×2.2 m and a settlement pond with scale of 2 m×1.5 m×1.4 m. Results indicate that the contents of total nitrogen (TN), ammonium nitrogen (NH + 4 N) and available nitrogen (AN) in soil of root zone (0~30 cm below the soil surface) after irrigation with effluent are slightly lower than those after irrigation with potable water. However, the nitrate nitrogen (NO - 3 N) content in and below the root zone soil is much higher than that after irrigation with potable water, and average content of TN in plant after irrigation with effluent is approximately 50% higher than that after irrigation with potable water. The contents of NO - 3 N in soil layers especially in the layers of 15~30 cm and 30~45 cm below surface with sub drip irrigation of effluent are higher than that after subsurface irrigation with porous pipe with effluent, but there are no differences in contents of TN, NH + 4 N and AN in soil between the two irrigation methods.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2002年第3期22-25,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重点基础研究发展规划项目 (G19990 45 70 6)
国家自然科学基金项目 (5 98790 2 8)
关键词
污水灌溉
草坪草
土壤含氮量
植株含氮量
irrigation with effluent
turfgrass
total nitrogen content of soil
nitrogen content of plant
