小胡杨对滨海苏打盐渍土改良效果研究

Amelioration Effects of Populus simonii×P.euphratica on Coastal Saline-Sodic Soils

滨海苏打盐渍土修筑台田后种植小胡杨可以成活,18年后小胡杨林分基本郁闭。以未种植树木的台田作为对照(CK),对小胡杨林地内植被演替规律、土壤水分物理性质进行研究。结果表明,小胡杨成林后,林地内植被向良性方向发展,群落生态型由中度耐盐群落演替成轻度耐盐群落,群落高度也由0.2～0.6 m增加到0.5～0.8m,盖度则达到80%～90%,土壤也由苏打盐渍土转变成轻盐碱土;小胡杨可显著降低土壤容重,改善土壤孔隙状况,增加土壤持水性能,使土壤水分物理性质得到显著改良,其中,对0～10 cm土层的改良效果要好于10～30 cm土层。

Populus simonii×P.euphratica could survive on the raised fields established on coastal saline-sodic soils.The forests were almost closed in 18 years.Non-forest raised fields were regarded as control（CK）,vegetation succession law soil hydro-physical properties of P.simonii×P.euphratica were studied.Result shows that： vegetation in the forests developed well when P.simonii×P.euphratica stands were established;the ecotype of the community were turned into light salt-tolerant from moderate salt-tolerant,and the average height of community increased to 0.5-0.8m from 0.2-0.6m and the coverage reached 80%-90%;the soils were changed into light saline-alkali from saline-sodic.The soil bulk density was significantly reduced and soil porosity and water-holding properties were increased by P.simonii×P.euphratica,and the soil hydro-physical properties were significantly improved.Among them,the ameliorated effects in 0-10 cm layer of soil were better than that in 10-30 cm layer.