| 摘要: |
| 以黑木相思 Acacia melanoxylon SR17 人工幼林为研究对象，设置 6 个施硼量处理（0、2.5、
5.0、7.5、10.0、12.5 g · 株 -1 硼砂），分析不同施硼量对 0.6 a 黑木相思顶梢表型、叶片性状以及不同林龄
（0.6 a 和 1.6 a）植株株高、胸径、地径、冠幅和叶片营养元素含量等指标的影响。通过相关性分析，研究
不同施硼量对黑木相思人工幼林生长和生理特性的影响。结果表明：不施硼处理（0 g · 株 -1，CK）会导
致植株发生严重的顶梢枯萎、叶片呈黄红色，甚至脱落的表型，而施硼处理可以有效缓解这些症状。当
施硼量达 10.0 g · 株 -1 时，黑木相思无缺硼症状。施硼量的增加可以促进叶长、叶宽、叶周长、叶表面积
的增加，相较于 CK 处理，12.5 g · 株 -1（B5）施硼量处理叶长增加 17.53%，叶宽增加 12.68%，叶周长增
加 16.77%，叶表面积增加 29.15%。施硼量在 12.5 g · 株 -1 时可以显著促进不同林龄黑木相思株高的生长，
分别较 CK 处理增加 14.20% 和 62.22%。其 0.6 a 龄林分的地径和 1.6 a 龄林分的胸径也高于其他处理，分
别较 CK 处理增加 10.91% 和 64.14%。此外，增加施硼量可以促进黑木相思叶片硼元素的含量，但会抑制
钾元素含量的积累。施硼量与黑木相思株高、胸径、叶片硼元素极显著正相关（P<0.01），与钾元素含量
的积累极显著负相关 (P<0.01)。综上所述，在该试验区施 10.0 g · 株 -1 的硼肥可以满足植株正常生长的需
求，而 12.5 g · 株 -1 的硼肥则可以较好的促进黑木相思的生长发育。 |
| 关键词: 黑木相思 硼肥施用量 生长特性 营养元素 相关性分析 |
| DOI： |
| 分类号: |
| 基金项目:广东省林业科技计划项目 (2021-KYXM-08) |
|
| Effect of Boron Application on the Growth and Physiological Characteristics of Acacia melanoxylon Young Forest |
|
DING Wen-en1, Chen Xin-qiang1, Fan Xiu-qiong1, Zeng Bing-shan2, WEN Weiwen1, Chen Chao-li1, Zhang Chun-hua3
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1.Forestry Research Institute, Meizhou Academy of Agriculture and Forestry Sciences/Guangdong Engineering Technology Research Center (Meizhou) for the Development and Use of the Forest Characteristic Resources;2.Research Institute of Tropical Forestry, Chinese Academy of Forestry;3.Forestry Affairs Center of Guangdong Provincial
|
| Abstract: |
| In this study, in order to investigate the effects of different boron amounts (0, 2.5, 5.0, 7.5, 10.0,
and 12.5 g·plant-1 boric acid) on the phenotype of the top shoots and leaf traits of 0.6-year-old Acacia melanoxylon
SR17 in an artificial forest, as well as on the plant height, ground diameter, diameter at breast diameter(DBH),
crown width, and leaf nutrient content of plants of different ages(0.6 and 1.6-year-old). Correlation analysis was used to investigate the effects of different boron application rates on the growth and physiological characteristics
of the artificial A. melanoxylon forest. Results showed that the absence of boron treatment(0 g·plant-1, CK) caused
severe top shoot withering, yellowish red color, and even shedding of leaves, while boron treatment effectively
alleviated these symptoms. A. melanoxylon did not exhibit boron deficiency symptoms when the boron application
rate reached 10.0 g·plant-1. Increasing the boron application rate promoted the increase of leaf length, width,
circumference, and surface area. Compared with the CK treatment, the 12.5 g·plant-1 (B5) boron application rate
increased leaf length by 17.53%, leaf width by 12.68%, leaf circumference by 16.77%, and leaf surface area by
29.15%. The boron application rate of 12.5 g·plant-1 significantly promoted the growth of the plant height of
A. melanoxylon of different ages. Compared with the CK treatment, the plant height increased by 14.20% and
62.22% for the 0.6-year-old and 1.6-year-old forests under 12.5 g·plant-1 boron application amount, respectively.
In addition, increasing the boron application rate promoted the boron content but inhibited the accumulation of
potassium in A. melanoxylon leaves. The boron application amount was significantly positively correlated with
plant height, DBH, and leaf boron content(P<0.01), and significantly negatively correlated with potassium content
accumulation(P<0.01). In summary, the application of 10.0 g·plant-1 boron fertilizer can meet the needs of normal
plant growth in the experimental area, while the application of 12.5 g·plant-1 boron fertilizer can better promote
the growth and development of A. melanoxylon. |
| Key words: Acacia melanoxylon boron application amount growth characteristic nutrient element correlation analysis |
