摘要
采用短期室内中水灌溉土柱模拟和长期中水灌溉区大田定位调查,对中水灌溉后对植物体内营养元素、毒害离子以及重金属的增减变化进行对比分析。结果表明,与清水对照相比,中水灌溉使绿地土壤pH值降低,土壤有机质含量增加,孔隙度增大,容重及田间持水量减小;全氮、全磷含量随土层厚度的增加而呈减少的趋势;碱解氮、有效磷和速效钾含量增加且与清水对照之间差异显著(P<0.05);盐离子在土壤中得以积累,含量增加;毒害离子和重金属含量呈增大或减少的趋势,与不同离子种类有关,但其含量极少,累积效应变化缓慢,且由于自然降水等因素的稀释和植物、土壤微生物等因素的吸收及降解,一般不会造成对土壤的污染及对植物的生长胁迫。
Adopt short-term indoor reclaimed water irrigation in the soil column simulation and long-term field investigation,identify positioning,for reclaimed water irrigation to plant nutrients mischief ion and heavy metal element,and decrease of change were compared and analyzed.Results showed that,with clear-water contrast,reclaimed water irrigation made greenland soil pH lower,soil organic matter content increased,porosity increased,density and field capacity decreased;Total nitrogens,total phosphorus content with the soil layer increases had decreasing trend;Alkali-hydro nitrogens,phosphorus and rapidly-available potassium content effectively controlled between water and increase and remarkable difference（P0.05）;Salt ions in the soil to accumulate,content increased;Toxicity ions and heavy metals content were increasing or decreasing trends,and were concerned with different ion species,but its content was few,the accumulation effect changed slowly,and because of natural precipitation factors such as soil microorganism dilution and plants,factors such as the absorption and tutorials,general won＇t cause damage to the soil pollution and stress on plant growth.
出处
《水土保持学报》
CSCD
北大核心
2011年第5期74-80,共7页
Journal of Soil and Water Conservation
基金
中水灌溉对园林绿地系统影响评价项目
关键词
中水灌溉
绿地土壤
营养成分
毒害离子
重金属
reclaimed water irrigation
greenbelts
nutritional components
toxicitions
heavy metals
