辽东低山丘陵区不同土地利用类型土壤酸度特征

Soil Acidity Characteristics of Different Land Use Types in the Low Mountain and Hilly Areas of Eastern Liaoning

    摘要
  • 摘要:
    目的 明确辽东低山丘陵地区不同土地利用类型土壤酸度现状及变化特征，为制定酸化土壤改良技术提供科学依据。
    方法 以辽宁省抚顺清原县为主要区域，采集旱田、水田和林地三种土地利用类型不同土层深度（0 ~ 80 cm）土壤样本，测定土壤pH值、交换性酸、盐基饱和度、酸害容量及酸害强度等指标，分析该地区不同土地利用类型土壤酸度特征。
    结果 旱田、水田和林地均表现为土壤酸化，pH平均值范围分别为5.02 ~ 5.72、5.84 ~ 6.15和5.76 ~ 5.97。0 ~ 40 cm土层旱田土壤pH值显著低于水田和林地，旱田土壤pH在0 ~ 60 cm土层随土层深度增加呈显著增加，土壤酸化下降显著，而水田和林地土壤pH在0 ~ 60 cm土层也随土层深度增加而增加，但土壤酸化下降并不显著。旱田表层土壤交换性酸含量显著高于水田与林地，而水田与林地差异不显著，在旱田0 ~ 60 cm土层中，交换性酸以交换性Al3 + 为主。在0 ~ 40 cm土层中，水田与林地土壤阳离子交换量及盐基饱和度均显著高于旱田；水田土壤酸害容量与酸害强度显著高于旱田和林地。
    结论 辽东低山丘陵区不同土地利用类型中旱田土壤pH值最低、酸化程度最重，不同土地利用类型土壤pH值均呈现深度加深而增高的规律，交换性酸和盐基饱和度则呈现相反的趋势，水田抵抗外界酸的能力较强。

     

    Abstract:
    Objective This study aims were to clarify the current status and variation characteristics of soil acidity under different land use types in the low mountain and hilly region of eastern Liaoning, in order to provide a theoretical basis and data support for developing improvement techniques for acidified soils.
    Method Soil samples were collected from dryland, paddy field and forestland at different depths (0 - 80 cm) in Qingyuan County, Fushun City, Liaoning Province. Soil pH, exchangeable acidity, base saturation, acid damage capacity and acid damage intensity were measured to analyze the soil acidity characteristics in different land use types.
    Result The soils in dryland, paddy field and forestland all exhibited acidification, with pH ranges of 5.02 - 5.72, 5.84 - 6.15 and 5.76 - 5.97, respectively. In the 0 - 40 cm soil layer, soil pH of dryland was significantly lower than that of paddy field and forestland. Soil pH of dryland increased significantly with depth in the 0 - 60 cm layer, indicating a marked decrease in acidification. Whereas soil pH of paddy field and forestland also increased with depth in the 0 - 60 cm layer, but the decrease in acidification was not significant. The exchangeable acidity content in the surface soil of dryland was significantly higher than that in paddy field and forestland, with no significant difference between paddy field and forestland. In the 0 - 60 cm layer of dryland, exchangeable acidity was dominated by exchangeable Al3+. In the 0 - 40 cm layer, the CEC and base saturation of paddy field and forestland were significantly higher than those of dryland. The acid damage capacity and acid damage intensity of paddy field were significantly higher than those of dryland and forestland.
    Conclusion Among the different land use types in the low mountain and hilly region of eastern Liaoning, dryland had the lowest soil pH and the most severe acidification. Soil pH of all land use types increased with increasing soil depth, while exchangeable acidity and base saturation showed opposite trends. Paddy field exhibited a stronger ability to resist external acid.

     

    • HTML全文
    • 参考文献(29)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回