Zhou Dao-Wei, Li Qiang, Song Yan-Tao, Wang Xue-Zhi
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China.
Ying Yong Sheng Tai Xue Bao. 2011 Jun;22(6):1423-30.
Field survey and site study were conducted to approach the process and causes of salinization-alkalization of Leymus chinensis grassland in Songnen Plain, and to examine the hypothesis of soil disturbance-bareness. In the grassland, surface soil (0-30 cm) had a lower salt content, while deeper soil (> 30 cm) was in adverse. Thereby, the grassland was defined as soil-salted grassland. There was an increasing salt content in surface soil. This process was called as soil salinization-alkalization, and the grassland under the salinization:alkalization was named as alkali-salinized grassland. The leading reason for the surface soil salinization-alkalization was that the surface soil originally with low salt content was disturbed and lost away, subsurface soil rich in salt emerged as new surface soil, and the salt in deeper soil layers accumulated in the new surface soil and other soil layers. Secondary halophyte communities formed on the surface-soil-disturbed new bare land, but the communities had no succession sequence. The degradation process of the grassland was soil degradation first, followed by vegetation degradation, halophyte invasion, and successive evolution from nearly primitive condition.
通过实地调查和现场研究，探讨松嫩平原羊草草地盐碱化过程及成因，验证土壤扰动-裸露假说。在该草地中，表层土壤（0-30厘米）盐分含量较低，而深层土壤（>30厘米）则相反。因此，该草地被定义为盐化草地。表层土壤盐分含量呈上升趋势。这一过程被称为土壤盐碱化，处于盐碱化状态的草地被称为碱化盐化草地。表层土壤盐碱化的主要原因是原本盐分含量低的表层土壤受到扰动并流失，富含盐分的下层土壤成为新的表层土壤，深层土壤中的盐分在新表层土壤和其他土层中积累。次生盐生植物群落出现在表层土壤受扰动的新裸地上，但这些群落没有演替顺序。草地的退化过程是先土壤退化，其次是植被退化、盐生植物入侵，从近乎原始状态依次演变。
