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川南丘陵区油茶叶片营养DRIS诊断

Nutrition Diagnosis of Camellia oleifera Leaves in the Hilly Region of South Sichuan with DRIS

  • 摘要: 对川南丘陵区油茶成林叶片的大、中、微量营养元素进行诊断,探明油茶的营养状况,总结叶片对各元素的需求范围,为川南丘陵区油茶科学施肥提供理论指导。以川南丘陵区油茶成林的叶片为研究对象,测定油茶叶片中的N、P、K、Ca、Mg、Cu、Zn、Fe和Mn 9种营养成分含量,采用DRIS指数法,诊断分析油茶需肥次序,利用高产组叶片养分浓度,建立油茶叶片DRIS营养诊断体系。结果表明:油茶树体需肥顺序为Ca>Zn>Mn>P>Mg>Cu>N>Fe>K;油茶叶片各营养元素含量的适宜范围为:N 10.978~15.456 g·kg−1、P 0.469~1.271 g·kg−1、K 0.959~8.844 g·kg−1、Fe 0.076~0.257 g·kg−1、Zn 8.390~24.477 mg·kg−1、Cu 2.790~5.980 mg·kg−1、Mn 1.151~90.485 mg·kg−1、Ca 2.056~10.054 g·kg−1、Mg 0.796~1.677 g·kg−1。结论:川南丘陵区油茶的K、Fe、N和Cu营养元素相对充足,Ca、Zn、Mn、P和Mg营养元素相对缺乏,为油茶林施肥的同时,应该注意补充Ca、Zn和Mn等中、微量元素肥。

     

    Abstract: To reveal the nutritional status of a mature Camellia oleifera stand located in the hilly region of Sichuan Basin by diagnosing the macro, medium and trace elements in the leaves and summarize the suitable fertilizing range of each nutrient, and provide theoretical guidance for the scientific fertilization of Camellia oleifera stands in this region. The leaves of Camellia oleifera sampled from a mature stand in the hilly area of South Sichuan Basin were used for the determination of contents of nine nutrients (N, P, K, Ca, Mg, Cu, Zn, Fe and Mn), and the nutrient requirement order of this Camellia oleifera stand was obtained by the establishment of the DRIS nutrition diagnosis system for Camellia oleifera leaves, Also, the DRIS nutritional diagnosis system for Camellia oleifera leaves was built. The results showed that the nutrient requirement order of this Camellia oleifera stand was Ca>Zn>Mn>P>Mg>Cu>N>Fe>K; the suitable content ranges of various nutrients were obtained, that is, N 10.978-15.456 g·kg−1, P 0.469-1.271 g·kg−1, K 0.959-8.844 g·kg−1, Fe 0.076-0.257 g·kg−1, Zn 8.390-24.477 mg·kg−1, Cu 2.790-5.980 mg·kg−1, Mn 1.151-90.485 mg·kg−1, Ca 2.056-10.054 g·kg−1, Mg 0.796-1.677 g·kg−1. Conclusion: In the hilly area of South Sichuan Basin, these nutrients, i.e. K, Fe, N and Cu are relatively abundant, while the remaining five nutrients, i.e. Ca, Zn, Mn, P and Mg in Camellia oleifera leaves are relatively deficient, which should be taken more consideration when fertilizing.

     

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