关键词: 土壤硒分布, 低硒带, 硒沉降, 硒挥发, 季风

Abstract: The distribution of selenium (Se) contents in surface soil are relatively nonuniformed in China. The region with poor Se in soil, so called Se-deficient soil belt, stretches from Northeast China to Southwest China. The mechanisms for Se distributions in Chinese soil, especially the formation of Se-deficient soil belt, are unclear. This review speculated that Se deposition associated with the East Asian monsoon and Se volatilization driven by microorganisms were key factors controlling Se distributions in surface soils in China. Wet deposition associated with the East Asian summer monsoon was responsible for dominant Se inputs into surface soils in Southeast China, and dry deposition associated with the East Asian winter monsoon was responsible for Se accumulation in surface soils in Northwest China. In Central China Se volatilization offset its precipitation, which cause negligible net Se input in surface soils. Se levels in most Chinese surface soil would be decreased in the future under climate change.

Key words: soil selenium distribution, selenium deficient belt, selenium precipitation, selenium volatilization, monsoon