关键词: 黑果枸杞（Lycium ruthenicum）, 土壤电导率, 民勤, 土壤盐分, 盐渍土

Abstract:

Soil salinization, one kind of land degradation in the Minqin basin, expanded rapidly recently. Random block experiment was employed to investigate the effects of the plantation of Lycium ruthenicum on horizontal and vertical distribution of soil salt. The experimental site were irrigated by 0.8 g·L-1, 2 g·L-1, 5 g·L-1 saline water two years precedent to the plantation of L. ruthenicum. The results showed that horizontal soil salt was significantly influenced by the concentration of irrigation water and soil depth. Mean soil electrical conductivity of 0-100 cm was in the consequence of the pre-treatment of 5 g·L-1>2 g·L-1>0.8 g·L-1 saline water. Two year plantation of L. ruthenicum increased the soil salt content under the canopy but decreased that in the interspace soil. The soil salt content at the 0-100 cm layers varied seasonally, which was positively related to the rainfall and the reference evapotranspiration ratio.

Key words: Lycium ruthenicum, soil electrical conductivity, Minqin oasis, soil salt, saline soil