| 摘要: |
| 【目的】研究不同磷源对酸性红壤养分及油茶生长的影响，为油茶施肥提供参考。【方法】以油茶‘湘林4号’为试材，以不施外源磷为对照，通过盆栽试验，研究无机难溶磷(Ca-P、Al-P和Fe-P)和有机磷源（O-P）对酸性红壤养分、油茶幼苗生长及树体营养水平的影响。【结果】不同磷源对酸性红壤养分含量的影响有差异，其中Fe-P显著提高土壤全磷含量，而Ca-P和Al-P则显著提高土壤有效磷含量；在根际土壤中，Ca-P和Al-P处理的有效磷含量较对照分别提高120倍和125倍。油茶根际与非根际土壤中的养分含量具有明显差异。Ca-P和Al-P明显提高了油茶苗高、地上部干质量和根系鲜质量，降低根冠比，而Fe-P和O-P的作用不明显。在土壤中添加不同磷源显著提高了油茶老叶、新叶以及根系中的磷含量，并明显影响植株中的氮和钾含量。【结论】无机难溶磷和有机磷可提升酸性红壤肥力并促进油茶生长，其中以Ca-P和Al-P作用最明显；对于长期不施肥的油茶林地，Al-P和其他难溶磷能被油茶有效利用。 |
| 关键词: 油茶 难溶磷 酸性红壤 营养 生长 |
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| 基金项目:油茶；难溶磷；酸性红壤；营养；生长 |
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| Effects of phosphates from different sources on the growth of Camellia oleifera seedlings and content of nutrients in acidic soil |
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| Abstract: |
| 【Objective】This study aimed to improve phosphorus use efficiency when applied to oil-tea.【Method】The growth of Camellia oleifera‘Xianglin 4’ and nutrients content in acidic soils were tested in pot experiment with sparingly soluble and organic phosphates in compared with no exogenous phosphorus applied.【Result】The application of sparingly soluble and organic phosphates had distinct impact on the nutrients levels in acidic soil.Total phosphorus content was accumulated by Fe-P while the content of available phosphorus content was increased by Ca-P and Al-P significantly and the values were 120 times and 125 times in rhizosphere soil as compared with CK.Meanwhile,there were significant differences between contents of rhizosphere and non-rhizosphere soil.The Ca-P and Al-P increased the seedling height,fresh weight of shoot,dried weight of root while decreased root/shoot ratio significantly.The effects were not significant when treated with Fe-P and O-P.The application of sparingly soluble and organic phosphates increased the P content of old leaves,tender leaves and roots and affected their N and K contents as well.【Conclusion】In conclusion,the sparingly soluble and organic phosphates increased fertility of acidic soils and growth of oil-tea,of which the most significant effects were obtained by Al-P and Ca-P.Al-P and other sparingly soluble phosphates may be the main source of plant P in unfertilized soil. |
| Key words: Camellia oleifera sparingly soluble phosphate acidic soil nutrient growth |
