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SCI论文目录 |
Effects of Phenolics on seedling growth and 15N nitrate absorption of Cunninghamia lanceolata |
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| 出 版 社：Allelopathy Journal |
| 发表时间：2005年1月 |
| 台 站：
会同森林生态系统定位研究站
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| 作 者：Chen Longchi |
| 点 击 率：373032 |
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| 关 键 字：Allelochemicals, Chinese fir, -hydroxybenzoic acid, 15N, Phenolics, |
| 摘 要：Chinese fir (Cunninghamia lanceolata) has replant problem under field
conditions and has been attributed to phenolic allelochemicals, which cause its
autotoxicity. To determine the mechanism of inhibitory effects of phenolics on Chinese
fir, we studied their effects on growth and 15N nitrate absorption by each organ of its
seedlings, cultured in pots using 15N-labelled isotope trace technique. The 1×10-3
mol·L-1 vanillic acid and phenolics mixture (0.5×10-3 mol·L-1 vanillic acid and 0.5×10-3
mol·L-1
-hydroxybenzoic acid) significantly inhibited the seedling growth of Chinese
fir. Phenolics solution of 1×10-2 mol·L-1 concentration decreased total N content of
roots, stems and leaves. 15N derived from the fertilizer (NDFF) in roots, stems and
leaves treated with 1 × 10-2 mol·L-1 vanillic acid was 36.1, 42.7 and 38.5% less,
respectively, and corresponding values for phenolics mixture at the same concentration
were 14.1, 17.2, and 17.0% lower, respectively, compared to control. In contrast,
vanillic acid and -hydroxybenzoic acid at 1×10-5 mol·L-1 stimulated the seedling
growth, enhanced total 15N content and increased 15N nitrate absorption. These
treatments also increased the 15N nitrate distribution in roots and reduced its
distribution in stems and leaves. We suggest that accumulated phenolics in soil could
inhibit seedling growth through reducing nutrient absorption by Chinese fir and
consequently leading to low productivity of replanted Chinese fir. |
| 关 键 字(英文)：Allelochemicals, Chinese fir, -hydroxybenzoic acid, 15N, Phenolics, |
| 摘 要(英文)：Chinese fir (Cunninghamia lanceolata) has replant problem under field
conditions and has been attributed to phenolic allelochemicals, which cause its
autotoxicity. To determine the mechanism of inhibitory effects of phenolics on Chinese
fir, we studied their effects on growth and 15N nitrate absorption by each organ of its
seedlings, cultured in pots using 15N-labelled isotope trace technique. The 1×10-3
mol·L-1 vanillic acid and phenolics mixture (0.5×10-3 mol·L-1 vanillic acid and 0.5×10-3
mol·L-1
-hydroxybenzoic acid) significantly inhibited the seedling growth of Chinese
fir. Phenolics solution of 1×10-2 mol·L-1 concentration decreased total N content of
roots, stems and leaves. 15N derived from the fertilizer (NDFF) in roots, stems and
leaves treated with 1 × 10-2 mol·L-1 vanillic acid was 36.1, 42.7 and 38.5% less,
respectively, and corresponding values for phenolics mixture at the same concentration
were 14.1, 17.2, and 17.0% lower, respectively, compared to control. In contrast,
vanillic acid and -hydroxybenzoic acid at 1×10-5 mol·L-1 stimulated the seedling
growth, enhanced total 15N content and increased 15N nitrate absorption. These
treatments also increased the 15N nitrate distribution in roots and reduced its
distribution in stems and leaves. We suggest that accumulated phenolics in soil could
inhibit seedling growth through reducing nutrient absorption by Chinese fir and
consequently leading to low productivity of replanted Chinese fir. |
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