摘要
分别在湖南的郴州和长沙选定两小流域(SZY 和 LKS),从小流域规模分析了酸雨频降区两小流域土壤的主要理化特性和土壤 Al、Fe 形态。结果表明:在小流域 SZY 土壤中,各种形态的 Al、Fe 含量均高于小流域 LKS 土壤中对应形态的 Al、Fe 含量;在同一剖面, 各种形态的 Al、Fe 含量有表土高于底土的趋势。两小流域土壤中,除 Feox外各种形态的 Al、Fe 均与土壤有机质呈正相关,酸沉降能影响 Al、Fe 形态的转化和淋溶。酸沉降影响 Al、Fe 的溶出可能是通过形成可溶性的有机物-Al、Fe 的复合物而从难溶性 Al、Fe 转化而来。土壤中各种形态的 Al 与对应形态的 Fe 呈线性正相关,酸沉降增加了毒性元素 Al 的溶出,同时也可能增加营养元素 Fe 的有效性。
Soil Al(Fe)-pools and basic properties of the forest soils gathered from five profiles (consisting of four horizons) in two catchments (SZY and LKS) in Hunan were determined. Al- and Fe-pools were higher in SZY than in LKS and generally higher in the top soils than in the subsoils. They, except Feox, were positively correlated to the content of soil organic matter in the two catchments. Acid deposition may affect transformation and leaching of soil Al and Fe through formation of soluble organo-metal complexes. Significant positive correlations were observed between various forms of Al and their corresponding forms of Fe in the soils. Moreover, acid deposition also increased leaching of toxic Al and possibly availability of nutrient Fe.
出处
《土壤》
CAS
CSCD
北大核心
2004年第4期405-411,共7页
Soils
基金
国家教育部(教技司[2000]156-00209)
挪威国家科学研究理事会资助。
关键词
小流域
铝形态
酸沉降
土壤酸化
湖南
Small catchment, Al (Fe)-pools, Acid deposition, Hunan
