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氟对茶树幼苗营养元素的影响

Nutrient Contents of Tea Seedlings under Fluoride-stress

  • 摘要: 为明确不同浓度氟对茶树生长和对几种营养元素吸收的影响,本研究采用沙培盆栽方法,以‘瑞香’品种的扦插苗(10月龄)为试验材料,采用单因素试验统计分析方法,设4个氟处理浓度(分别为0、100、200、600 mg·L-1),每周3次,处理6周。结果表明:随着供氟浓度的增加,茶树叶片、茎干重均显著降低;根冠比在高氟浓度(600 mg·L-1)处理下显著增加;根、茎、叶片的氟含量随着氟处理浓度的增大均表现为上升趋势;叶位、茎部和根部磷含量在氟处理浓度达到600 mg·L-1时显著降低;茎部和根部钾含量在较低氟浓度处理时较高,在氟浓度达到200 mg·L-1时显著降低;钙含量在叶位随着氟浓度的增加逐渐降低,在氟处理浓度达到600 mg·L-1时显著降低;根部镁含量在高氟浓度(600 mg·L-1)处理时显著降低。其余各部位元素含量随着氟处理浓度增加变化不显著。通过相关性分析,叶片氟含量与叶片钙含量呈负的线性相关YCa=-0.0029X+1.9852,R2=0.9864,与叶片总N含量呈正的线性相关YN=0.0179X+28.5509,R2=0.6662。

     

    Abstract: Effect of fluoride (F)-stress on the nutrients absorbed by a tea plant was studied. Seedlings of 10-month-old Camellia sinensis (L.) O. Kuntze cv. Ruixiang grown in pots were fed 3 times weekly for 6 weeks with a nutrient solution containing 0, 100, 200 or 600 mg NaF/L. Contents of F, N, P, K, Ca and Mg in the seedlings were determined. The result showed that F-stress significantly reduced the dry weights of leaves and stems. The ratio of root/shoot (dry weights) declined slightly initially and followed by a significant increase as F concentration reached 600 mg/L. The F contents in the parts, leaves especially, increased with increasing F in solution. Under high F-stress, P in the leaves, stems and roots significantly decreased. In contrast, K in the stems and roots were high under low F treatment and decreased significantly as F concentration was beyond 200 mg/L. Ca in the leaves decreased gradually with increasing F and reduced significantly at the highest F. Mg in the roots significantly declined under 600 mg NaF/L. Otherwise, there were no significant effects on the nutrients in the parts of a plant due to the increased F. The regression equations for contents in leaves between F and total N was determined to be Y(N)=0.0179X+28.5509(R2=0.6662) and between F and Ca, Y(Ca)=-0.0029X+1.9852(R2=0.9864).

     

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