高级搜索

不同施肥模式对茶园土壤团聚体及养分化学计量特征的影响

Soil Aggregation and Nutrient Stoichiometry Affected by Fertilizations at Tea Plantations

    摘要
  • 摘要:
    目的 探究不同施肥模式下茶园土壤团聚体结构分布特征、土壤养分及其化学计量特征，为提升土壤肥力、制定茶园最适施肥模式提供理论依据。
    方法 以不同肥料类型（化肥、有机肥和生物菌肥）与不同施肥方式（撒施与沟施）设置100%化肥沟施（F）、50%化肥+50%有机肥沟施（OFF）、100%有机肥撒施（OFS）、100%有机肥沟施（OFG）、100%生物菌肥撒施（OFWS）及100%生物菌肥沟施（OFWG）共6个处理，以不施肥（CK）为对照，研究不同施肥模式对茶园土壤水稳定性团聚体不同粒径结构特征、养分及其化学计量特征的影响。
    结果 在不同肥料类型上，有机碳含量在OFWG处理最高（31.77 g·kg−1），在CK处理最低（14.46 g·kg−1）；pH在OFG处理下最高，为5.46，在F处理下最低，为4.43；＞2 mm 粒径在OFG处理最高（27.29%），在F处理最低（4.20 %）；＜0.25 mm粒径在OFF处理下最高（35.64%），在OFWG处理下最低（25.38%）；与F处理对比，OFF处理下几何平均直径（Geometric mean diameter, GMD）、平均重量直径（Mean weight diameter, MWD）和＞2 mm水稳定性团聚体占比显著增加，土壤可蚀性K值显著下降。在不同施肥方式上，OFG和OFWG处理更有利于提高土壤有机碳、全氮和全钾含量，OFS和OFWG处理显著提高土壤全磷含量；OFG和OFWG处理更有利于GMD和MWD的提升；R0.25在OFWG处理最高（74.62%）。冗余分析（Redundancy analysis, RDA）结果表明，2-1 mm粒径、1-0.5 mm粒径和可蚀性因子K值是影响土壤养分的主要因子。Pearson相关性分析表明，2-1 mm与有机碳含量呈显著负相关（P＜0.01），与全氮含量、碳钾比呈显著负相关（P＜0.05）。
    结论 有机肥和生物菌肥采用沟施方式更有利于提高土壤有机碳、全氮和全钾含量，并促进大团聚体的形成，显著改善茶园土壤结构与养分供应，提高土壤质量。

     

    Abstract:
    Objective Aggregates distribution and nutrients stoichiometry of tea plantation soil under different fertilization modes were analyzed.
    Method On field experimentation lots, treatments of no fertilization as control (CK) and, on furrows applying a chemical fertilizer (F), an organic fertilizer (OFG), a biofertilizer (OFWG) or half of the chemical fertilizer with other half of the organic fertilizer (OFF), as well as by broadcasting the organic fertilizer (OFS) or the biofertilizer (OFWS) were implemented. The resulting particle sizes of water-stable aggregates and nutrient stoichiometric characteristics of the tea garden soils were determined.
    Result Among the various treatments on the soil, OFWG generated the most organic carbon at 31.77 g·kg−1, and CK the least at 14.46 g·kg−1; OFG the highest pH of 5.46, and F the lowest at 4.43; OFG the greatest proportion of aggregates particle size larger than 2 mm of 27.29%, and F the smallest of 4.20%; and OFF the highest percentage in ＜0.25 mm aggregates at 35.64 %, and OFWG the least at 25.38%. OFF significantly heightened the geometric mean diameter (GMD), mean weight diameter (MWD), and ＞2 mm water-stable aggregates proportions in soil under F, while significantly reduced the erodibility factor K. OFG and OFWG elevated the organic carbon, total nitrogen, total potassium, GMD, and MWD, whereas OFS and OFWG did to the total phosphorus. OFWG exerted the highest R0.25 ratio of 74.62%. The RDA indicated the aggregates sized 2-1 mm and 1-0.5 mm and erodibility K to be the major indicators for soil fertility. The Pearson correlation analysis showed the content of 2-1 mm aggregates to significantly inversely correlate with that of organic carbon at P＜0.01, and with that of total nitrogen and ratio of carbon-potassium at P＜0.05.
    Conclusion The application of organic or bio fertilizer on furrows at a tea plantation increased the contents of organic carbon, total nitrogen, and total potassium as well as promoted the formation of large aggregates, resulting in significantly improved structure and fertility of the soil.

     

    • HTML全文
    • 参考文献(32)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回