重度盐碱地营造杨树人工林土壤改良效果

Effect of Poplar Plantation on Soil Amelioration in Severe Saline-alkali Soil

为探讨重度盐碱地营造杨树人工林对土壤的改良效果,本实验以黑龙江省肇东市重度盐碱地作为研究对象,采用小穴改良"一字沟"觅食丘式原位修复、小穴改良"十字沟"觅食台式原位修复和小穴改良"井字沟"觅食坛式原位修复的方法对重度盐碱地进行改良。研究结果表明:实施不同改良措施后土壤特性发生了显著变化,土壤pH值、电导率含量显著下降;土壤碳酸根含量显著下降,交换性钙、镁含量显著提高;土壤胡敏酸和壳聚糖含量明显提高,土壤肥力增加。因此,本研究所采用的三种不同的改良措施具有良好的改良效果。

In order to investigate the effect of constructing poplar plantation on soil amelioration, the severe sa- line-alkali soil of Zhaodong City, Heilongjiang Province was studied. The 4 treatments were CK （Control）, Bar treatment （Small hole improvement -Bar foraging ditch -In situ repair）, Cross treatment （Small hole improve- ment - Cross foraging ditch - In situ repair） and Grid treatment （ Small hole improvement - Grid form of foraging ditch - In situ repair）, respectively. The results of the present study showed that the different improvement treat- ments changed the severe saline-alkali soil characteristics, significantly decreased the pH value, conductivity and car- bonate content in soil surface （p 〈0. 05）. Meanwhile, the exchange of calcium and magnesium ion contents, and the humic acid and chitosan contents were significantly increased （p 〈 0.05）. Therefore, the 3 different treatments, based on Small hole improvement and In situ repair, had well modified effects for the severe saline-alkali soil.