| Soil physicochemical properties of poplar plantation stand under the new technique of saline-alkali soil reclamation in coastal area were investigated. The results show that the average soil moisture content of the new technique-used area was 20.36% which was significantly higher than that in the control（16.21%） under the same amount of water supply. Soil bulk density of the new technique-used area averaged 1.36 g·cm-3, significantly lower than the control（1.46 g·cm-3）. The mean soil pH in the new technique-used area was 7.86, lower by 0.23 than the control. Total salt content was 1.96 g·kg-1 in the new technique-used area, significantly lower than the control（2.67 g·kg-1）. The cluster analysis showed that NaCl and Na2SO4 were the main soil salinity in the new technique-used area, while NaCl was the main soil salinity in the control. The mean concentrations of soil organic matter, available nitrogen and available phosphorus content in the new technique-used area were 17.53 g·kg-1, 20.48 mg·kg-1 and 63.59 mg·kg-1 respectively, which were 1.42, 4.31 and 1.32 times as high as the control. In a word, compared with the traditional technique, the new technique of saline-alkali soil reclamation was more efficient on the aspects of maintaining soil moisture and nutrients, keeping soil loosening and preventing the soil salinization. Thus higher survival rate and annual growth of poplar plants was found in the new technique-used area. This study could provide a theoretical basis and reference for planting deep-rooted trees in the coastal heavy saline areas. |
