污水灌溉对番茄生理特性及土壤环境的影响

Effects of Sewage Irrigation on Physiological Characteristics of Potato and Soil Environment

采用日光温室研究了污水灌溉对番茄的生长发育、产量及品质的影响,探讨了Hg和As在表层土壤和番茄果实中的积累。结果表明,污水灌溉能显著促进番茄植株生物量的增加。随着时间的推移,番茄根系的密集层和根系体积有逐渐加深加大的趋势。番茄果实中各品质指标间存在显著差异,生育后期,可溶性总糖含量均比前期高。污水灌溉后土壤中Hg和As含量在不同土层差异较大,其累积顺序为As>Hg。污水灌溉条件下土壤中Hg和As含量都大于清水灌区,但污灌后果实中没有出现重金属显著偏高的现象,而且番茄果实对As吸收的选择性高于Hg。

Greenhouse was used to study the effect of sewage irrigation on growth and development, yield and quality of potato. And the accumulation of Hg and As in surface soil and tomato fruit. It showed that plant biomass of potato was increased by sewage irrigation. And root dense layer became deeper and root volume became bigger with time going. There are significant differences between every quality indexes of potato fruit. The total soluble sugar content is higher in later growing stage than earlier stage. There is greater difference between the content of Hg and As in different soil layer after sewage irrigation, and the order is As〉Hg. The content of Hg and As in soil by sewage irrigation is greater than clean water treatment. But the content of heavy metal did not increase remarkably in potato fruit after sewage irrigation. The selective absorption of potato fruit to As is higher than Hg.