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| Seasonal Dynamics of Nutrients in Leaves and Soil ofCarya cathayensis in Karst Area of Northwestern Guangxi |
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| DOI：10.16768/j.issn.1004-874X.2022.05.006 |
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| Abstract: |
| 【Objective】The study was carried out to explore the dynamic changes of leaf nutrients and soil nutrients
of Carya cathayensis in different seasons of the year, and provide basis for fertilization, management and transformation
of low yield forest of C. cathayensis economic forest and control of rocky desertification in karst area.【Method】Twenty
C. cathayensis were selected from 10 walnut orchards in Huanjiang County to collect leaves and soil. Leaf nutrients (total
carbon, total nitrogen, total phosphorus, total potassium, calcium, iron, zinc and boron) and soil physical and chemical
properties (organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus, rapid potassium, available boron, available iron, available zinc and available calcium) were determined, and the seasonal dynamics of
leaves and soil nutrients were analyzed.【Result】With the growth of C. cathayensis, the content of nitrogen in leaves gradually
decreased to 13.59 g/kg, while the contents of boron and calcium gradually increased. Iron content decreased first and then
increased, while phosphorus content was the opposite. The calcium content in July and October was about twice that in April
(13.54 g/kg). The contents of exchangeable calcium and available boron in the forest soil increased first and then decreased, and
the content of total potassium gradually increased to 8.84 g/kg. The effective zinc content in April (8.46 mg/kg) was 6.9 times
that in October. There were obvious seasonal changes in leaf nutrients. Except for organic matter and available nitrogen, other
nutrients in soil had obvious seasonal changes. Correlation analysis showed that there was a significant negative correlation
between leaf nitrogen and soil available zinc, a very significant negative correlation between leaf phosphorus and soil available
nitrogen, and a significant negative correlation between leaf iron and soil available phosphorus.【Conclusion】The application
of potassium fertilizer should be strengthened at the flowering stage of C. cathayensis; attention should be paid to the application
of nitrogen and potassium fertilizers to improve the availability of macro elements during the fruit growth period; phosphorus
fertilizer and trace element fertilizers such as calcium and boron should be supplemented during the fruit ripening period. |
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