再生水灌溉绿地的环境影响研究

发布时间：2017-12-31 19:28

本文关键词：再生水灌溉绿地的环境影响研究　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：作为可替代水源,再生水利用可以有效地缓解水资源的短缺。目前,再生水主要回用于工业、农灌、景观和城市杂用水等低质水方面。但是,城市再生水水质复杂,作为绿化用水存在一定风险。所以研究再生水作为绿地灌溉用水对土壤、植物、微生物及地下水的影响十分必要。通过试验研究,得到以下结论:(1)在设定的灌溉强度下,再生水渗滤液中的TN浓度、TP浓度、TDS浓度和NO3--N浓度均高于自来水灌溉下渗滤液中的浓度,并且试验用再生水的使用不会引起地下水污染。(2)再生水灌溉根系层(0-20 cm)土壤的有机质、碱解氮含量影响不显著,对有效磷、速效钾含量影响显著;对非根系层(20-40 cm)土壤的有机质含量影响不显著,对碱解氮、有效磷、速效钾含量影响显著。除碱解氮有在根系层富集、向下显著减少的变化趋势之外,有机质、有效磷及速效钾没有明显的富集、骤减、分层现象。(3)再生水灌溉下的四种植物的叶绿素均高于自来水灌溉条件的四种植物的叶绿素,说明再生水的使用可以促进沿阶草、紫花酢浆草、高羊茅和鸢尾这四种植物的叶绿素含量的增加,有利于这四种植物的光合作用。(4)再生水灌溉量为48 L之前,四种植物的细胞膜相对透性均有增大,说明在一定程度上再生水有利于植物抗逆性的增强,但之后对植物的抗逆性有减弱作用。(5)再生水的灌溉对沿阶草根系活力的影响不显著,但是可以显著地有效地促进紫花酢浆草根系活力的增加;在一定范围内,可以在一定程度上增加高羊茅和鸢尾的根系活力。(6)再生水的灌溉对植物根际土壤中细菌、真菌、放线菌种群密度有一定影响,但是影响不显著。气候和降水是影响细菌种群密度变化的主要原因,而植物根系土壤含水率、土壤温度等是影响真菌和放线菌种群密度变化的主要原因。
[Abstract]:As an alternative water source, reclaimed water utilization can effectively alleviate the shortage of water resources. At present, reclaimed water is mainly used in low quality water such as industry, agricultural irrigation, landscape and urban miscellaneous water. The water quality of urban reclaimed water is complex and there are some risks as green water. So it is necessary to study the effect of reclaimed water as irrigation water on soil, plants, microorganisms and groundwater. Under the given irrigation intensity, the TN concentration, TP concentration, TDs concentration and NO3--N concentration in the leachate of reclaimed water were higher than those in the leachate under tap water irrigation. And the use of experimental reclaimed water will not cause groundwater pollution. 2) reclaimed water irrigation roots layer 0-20 cm) soil organic matter, alkaline nitrogen content has no significant effect on available phosphorus. The effect of available potassium content was significant. There was no significant effect on soil organic matter content in non-root layer (20-40 cm), but significant effect on alkali-hydrolyzed nitrogen, available phosphorus and available potassium. However, the organic matter, available phosphorus and available potassium were not significantly enriched and sharply decreased. Stratification phenomenon. (3) the chlorophyll of the four plants irrigated with reclaimed water was higher than that of the four plants under tap water irrigation, which indicated that the use of recycled water could promote the utilization of Oxalis arbusci and Oxalis lanceolata. The increase of chlorophyll content in tall fescue and iris was beneficial to the photosynthesis of these four plants. The results showed that to some extent, reclaimed water was beneficial to the enhancement of plant stress resistance, but later had a weakened effect on plant resistance. 5) the irrigation of regenerated water had no significant effect on the root activity along the grass. However, the root activity of Oxalis lanceolata could be increased significantly. In a certain range, irrigation can increase the root activity of tall fescue and iris to a certain extent) the irrigation of reclaimed water has a certain effect on the population density of bacteria, fungi and actinomycetes in the rhizosphere soil of plants. However, climate and precipitation are the main reasons for the change of bacterial population density, while the soil moisture content and soil temperature of plant roots are the main reasons for the change of population density of fungi and actinomycetes.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;X820.3

【参考文献】