湖南省柑橘园土壤酸缓冲特性及主要影响因素

Soil Acid-base Buffering Characteristics and Main Influencing Factors in Citrus Orchards of Hunan Province

    摘要
  • 摘要:
    目的 弄清柑橘园土壤酸缓冲特性与影响因素，为果园土壤酸化改良提供依据。
    方法 以冰糖橙园为研究区，通过野外调查，采集67个土壤样点，利用酸碱滴定分析土壤酸缓冲容量，进一步通过相关性分析和逐步回归分析等方法研究土壤酸缓冲容量与各影响因素之间的关系。
    结果 柑橘园土壤总体偏酸（pH 4.90 ± 0.57），酸缓冲容量18.54 ± 3.99 mmol kg−1，总体对酸敏感，在土壤pH < 5.0和≥ 5.0时差异明显。不同类型土壤的酸缓冲能力差异不显著，但对pH变化的敏感度表现为红壤 > 水稻土 > 紫色土。皮尔逊相关分析表明，土壤酸缓冲容量与交换性酸、交换性氢、交换性铝呈显著负相关（P < 0.05），与有机质、速效钾、缓效钾、交换性钙、交换性镁、有效铜、有效锰等因素呈极显著正相关（P < 0.01），与全氮、有效铁、海拔显著正相关（P < 0.05）。逐步回归分析表明，有机质、交换性钙、速效钾对酸缓冲容量变化的累计解释量为57.9%。
    结论 湖南省冰糖橙果园土壤酸缓冲容量与pH和土壤类型密切相关，有机质和交换性盐基离子含量可协调土壤缓冲能力，建议根据土壤pH、土壤类型和肥力水平选择性施有机肥、碱性土壤改良剂或钾肥以适当提高土壤酸缓冲容量，为柑橘园的持续利用提供保障。

     

    Abstract:
    Objective The aims were to understand the acid-base buffering characteristics of citrus orchard soils and their influencing factors for improving soil acidification.
    Method Through field surveys, 67 soil samples from Citrus sinensis orchard were collected then soil acid buffering capacity were analyzed with acid-base titration. Correlation analysis and stepwise regression were employed to explore the relationship between soil acid buffer capacity and its influencing factors.
    Result The results showed that the citrus orchard soil was generally acidic (pH 4.90 ± 0.57), with an acid-base buffering capacity (pHBC) of 18.54 ± 3.99 mmol kg−1, indicating sensitivity to acid. Significant differences were observed when soil pH was < 5.0 or ≥5.0. The acid-base buffering capacity showed no significantly difference among different soil types, but the sensitivity to pH change followed the order of krasnozem > paddy soil > purple soil. Pearson correlation analysis revealed that soil acid buffering capacity was significantly negatively correlated with exchangeable acidity, exchangeable hydrogen, and exchangeable aluminum (P < 0.05), while it was significantly positively correlated with organic matter, available potassium, slowly available potassium, exchangeable calcium, exchangeable magnesium, available copper, and available manganese (P < 0.01). Additionally, it showed significant positive correlations with total nitrogen, available iron, and elevation (P < 0.05). Stepwise regression analysis indicated that organic matter, exchangeable calcium, and available potassium collectively explained 57.9% of the variation in acid-base buffering capacity.
    Conclusion The acid buffer capacity of soils in Citrus sinensis orchards in Hunan Province closely correlated to soil organic matter and exchangeable base ions, which showed a close linkage to soil pH and soil type. It is recommended to selectively apply organic fertilizers, alkaline soil amendments, or potassium fertilizers based on soil pH, soil type, and fertility levels to moderately enhance soil acid-base buffering capacity, thereby ensuring sustainable orchard utilization.

     

    • HTML全文
    • 参考文献(46)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回
Baidu
map