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Scientia Silvae Sinicae ›› 2022, Vol. 58 ›› Issue (11): 174-180.doi: 10.11707/j.1001-7488.20221116

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Feasibility of Sap Flow in Early Spring Used for Nutrition Diagnosis of Betula platyphylla Plantation

Jianwen Hu,Qingcheng Wang*   

  1. School of Forestry, Northeast Forestry University Harbin 150040
  • Received:2021-04-25 Online:2022-11-25 Published:2023-03-08
  • Contact: Qingcheng Wang

Abstract:

Objective: This study aims to explore the potential of nutrient content in sap flow for nutritional diagnosis of Betula platyphylla plantation, so as to explore a more economical and convenient method for tree nutritional diagnosis. Methods: The 12-year-old B. platyphylla plantation was targeted, a relatively flat site was selected, and a sample plot (30 m×120 m) was set up. Forty sample trees with normal growth and free of diseases and insect pests were randomly selected. Three kinds of materials including tree leaves, topsoil occupied by individual trees and sap flow in early spring were collected before leaves were completely spread. Then the correlation coefficient between the nutrient content of the three kinds of samples and tree growth was analyzed to determine the feasibility of sap flow used for nutrition diagnosis. Results: The element contents in sap flow from high to low were total carbon (TC) (4.03±0.16 g·L-1), total nitrogen (TN) (60.66 mg·L-1±4.02 mg·L-1), total potassium (TK) (34.41 mg·L-1±2.14 mg·L-1) and total phosphorus (TP) (5.84 mg·L-1±0.52 mg·L-1). There was a significant positive correlation between tree height and TC content in soil, leaves and sap flow (P < 0.05). Stepwise regression analysis showed that TC content in sap flow had the greatest contribution to tree height (R2=0.145). Among the three diagnostic materials, only the contents of TN and TP in sap flow were positively correlated with DBH (P < 0.05). Stepwise regression analysis showed that only the TP content of sap flow had a significant contribution to DBH (R2=0.187). Conclusion: The results of correlation analysis and stepwise regression analysis indicate that sap flow can be used for nutrition diagnosis of B. platyphylla, and the analysis shows that the trees with poor growth are limited by C and P. The study provides a feasible method for tree nutrition diagnosis before complete leaf development, which is more reliable than soil and leaf nutrition diagnosis, and the diagnosis time can be advanced.

Key words: Betula platyphylla, sap flow, nutrition diagnosis

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