施用燃煤烟气脱硫废弃物改良盐碱土的效应研究

Effects on Amelioration of Saline-alkali soil with the By-product of Flue Gas Desulphurization(BFGD)

研究了施用燃煤烟气脱硫废弃物改良盐碱土后对根际土壤和枸杞根系生长的影响。结果表明:利用燃煤烟气脱硫废弃物改良盐碱土,根际土壤pH值由10.51下降到7.71,碱化度由32.3%下降到18.1%,Na+、K+、Mg2+、Cl-和HCO3-离子含量明显降低,而Ca2+和SO42-离子含量逐渐上升。燃煤烟气脱硫废弃物施用量为2.5t/667m2时,盐碱土壤改良效果最好,枸杞根系生长最旺盛,其根长、根表面积和根干重分别为44.78 cm、179.97 cm2和17.53 g。

In order to investigated the amelioration effects of saline - alkali soil with the by - product of flue gas desulphuriza- tion （FGDG）. The resuhs showed that： with the applications of FGDG, the rhizosphere soil pH values decreased from 10.51 to 7.82, the exchangeable sodium percentage （ESP） decreased from 32.2% to 18.1%. the rhizosphere soil contents of Na＋, K＋ , Mgz＋ , C1- , HCO3 - decreased significantly, the contents of Ca2＋ and SQ2- increased gradually. However, FGDG applicatiotl amount was 2.5t/667m2, saline- alkali soil improvement effect is best, and the Wolfberry taproot length was 44.78 cm , root surface area was 179.97 cm2 and root dry weight was 17.53 g.