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不同淋洗水量下胶州湾养殖池塘土壤盐分淋洗规律

李奇霏,孔范龙,郗敏*,李悦   

  1. (青岛大学环境科学与工程学院, 山东青岛 266071)
  • 出版日期:2018-04-10 发布日期:2018-04-10

Leaching of soil salt with different leaching water volumes in aquaculture ponds of Jiaozhou Bay.

LI Qi-fei, KONG Fan-long, XI Min*, LI Yue   

  1. (College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, Shandong, China).
  • Online:2018-04-10 Published:2018-04-10

摘要: 针对养殖池塘严重盐渍化现象,为确保土地资源和水资源的有效利用,通过室内土柱试验探讨不同淋洗水量下胶州湾养殖池塘土壤盐分淋洗规律,并确定最佳用水量。结果表明:随着淋洗水量的增加,土壤及其淋滤液的含盐量均以指数形式下降,为兼顾淋洗效果和节约用水,接近1∶1的水土比可以达到较好的改良效果;在脱盐过程中,土壤中Ca2+、Mg2+、K+、Na+、Cl-含量均呈下降趋势,SO42-含量呈先上升后下降的趋势,CO32-、HCO3-含量呈上升趋势;淋滤液中各盐离子浓度与土壤各盐离子变化规律类似;土壤各盐离子脱盐率大小大致表现为Cl->Na+>K+>Ca2+>Mg2+>SO42->HCO3-;随着淋洗水量的增加,土壤中离子组成由原来的Cl-和Na+为主先转变为以Na+、K+和SO42-为主,最后转变为Na+、HCO3-和K+为主。土壤脱盐过程伴随着土壤碱化现象,因此需要对盐渍土脱盐过程中的碱化现象进行进一步研究。

关键词: 蚂蚁, 易氧化有机碳, 白背桐群落, 时空动态

Abstract: Serious salinization often occurs in aquaculture ponds. To ensure the effective utilization of land and water resources, the leaching dynamics of soil salinity in aquaculture ponds in Jiaozhou Bay was examined with indoor soil column experiment. Another aim of our experiment was to explore the optimum water consumption. The results showed that the salt content of soil and its leaching solution exponentially decreased with the increases of leaching water volume. Taking the leaching effect and water saving into account, the 1∶1 ratio of water and soil couldachieve better improvement effect. In the process of desalting, the concentrations of Ca2+, Mg2+, K+, Na+, and Cl- in soils decreased, the concentration of SO42- first increased and then decreased, but the concentration of CO32- and HCO3- showed an upward trend. The concentration of each salt ion in leaching solution was similar to that of soil salt ion. The desalination rates of soil salt ions were in order of Cl->Na+>K+>Ca2+>Mg2+>SO42->HCO3-. With the increases ofleaching water volume, the soil ion composition changed from Cl- and Na+, to Na+, K+, and SO42-, and finally to Na+, HCO3- and K+. More attention should be paid on the alkalizationphenomenon occurred during soil desalting.

Key words: spatiotemporal dynamics, ants, easily oxidized organic carbon, Mallotus paniculatus community