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SCI论文目录 |
酚类物质对杉木幼苗15N养分吸收、分配的影响 |
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| 出 版 社：植物生态学报 |
| 发表时间：2002年10月 |
| 台 站：
会同森林生态系统定位研究站
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| 作 者：陈龙池 廖利平 汪思龙 黄志群 高洪 |
| 点 击 率：10337 |
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| 关 键 字：杉木 香草醛 对羟基苯甲酸 酚类物质 养分吸收 15N 同位素 |
| 摘 要： 应用15N 同位素示踪技术,通过盆栽实验研究了香草醛和对羟基苯甲酸对杉木( Cunninghamia lanceolata) 幼苗N 素养分吸收、分配的影响,结果发现香草醛及其与对羟基苯甲酸的混合物(浓度比1∶1) 明显抑制了杉木幼苗的生长和对15NO-3 离子的吸收,10 mmol·L - 1的香草醛使杉木幼苗根、茎、叶生物量分别下降了25. 3 %、13. 5 %、5. 7 % ,15N 吸收量分别减少了38. 5 %、48. 1 %、46. 5 %; 10 mmol·L- 1 的混合物使杉木幼苗根、茎、叶生物量分别下降了33. 5 %、36. 0 %、21. 8 % ,15N 吸收量分别减少了34. 3 %、58. 4 %、49. 3 %。同时还发现香草醛和对羟基苯甲酸的混合物(浓度比1∶1) 加重了对杉木幼苗生长的抑制作用,这说明两种酚类物质之间存在着协同作用。香草醛和混合物影响了杉木幼苗不同器官中N 素养分的分配,增加了根系中N 素的分配,而减少了茎、叶中N 素的分配率。香草醛等酚类物质浓度较高时能够抑制杉木幼苗养分的吸收和地上部分养分的分配,导致杉木缺乏生长所必须的养分,降低了杉木的生产力。 |
| 关 键 字(英文)：Chinese fir(Cunninghamia lanceolata), Vanillin, P-hydroxybenzoic acid, Phenolics, Nutrient absorption, 15N isotope |
| 摘 要(英文)： Pure Chinese fir ( Cunninghamia lanceolata) plantations , a major commercial tree species in South China , have been extensively replanted on the same site in successive rotations , in response to the growing need for timber. The resultant soil degradation has led to poor establishment and decline in productivity which has become a major barrier to the sustainable management of Chinese fir plantations. Recently , many documented studies indicate that allelopathy within Chinese fir plantations is likely one of the causes of soil degradation. According to some laboratory studies , extracts of Chinese fir roots , fresh leaves , and litter including
phenolics such as vanillin , ferulic acids and P-hydroxybenzoic acids , inhibit Chinese fir seed germination. However , no allelopathic responses have been demonstrated. How do the allelochemicals , e. g. phenolics , affect the growth of Chinese fir seedlings ? This has not yet been studied.
In this study on nutritional aspects of allelopathy in Chinese fir , the effects of different concentrations of vanillin and P-hydroxybenzoic acid on 15NO-3 ion absorption and distribution in Chinese fir seedlings was examined using the 15N isotope tracer technique. Vanillin , P-hydroxybenzoic acid , and a combined 1∶1 solution of these two materials were diluted to four different levels : 10 mmol·L - 1 , 1 mmol·L - 1 , 0. 1 mmol·L - 1 , and
0. 01 mmol·L - 1 . Distilled water was used as the control . One-year-old Chinese fir seedlings were planted in separate pots, fertilized with 200 mg NaNO-3 enriched 21. 97 percent Na 15NO-
3 , and grown outdoors in over shadow. Each pot was treated every half month with 100 ml of a particular concentration of vanillin , P-hydroxybenzoic acid solution , or the 1∶1 mixed solution. Each treatment consisted of five replicates of Chinese fir seedlings.
After six months height , stem diameter at ground line , total biomass , total N , and 15N content of Chinese fir seedlings were recorded. Results showed that vanillin inhibited both growth and 15NO-3 ion absorption. The mixed 1∶1 solution at the concentration of 10 mmol·L - 1 caused even greater reduction in growth of Chinese fir seedlings. The biomass of roots , stems and leaves of Chinese fir seedlings was reduced by 25. 3 % , 13. 5 % and 5. 7 % , respectively , and 15N absorption in roots , stems and leaves was reduced by 38. 5 % , 48. 1 % and 46. 5 % , respectively , with the treatment of 10 mmol·L - 1 of vanillin. Using the 10 mmol·L - 1 concentration of the 1∶1 mixed solution , the biomass of roots , stems and leaves of Chinese fir was reduced by 33. 5 % , 36. 0 % and 21. 8 % , respectively , and 15N absorption was reduced by 34. 3 % , 58. 4 % and 49. 3 % , respectively. This indicates that there is likely a synergistic effect between vanillin and P-hydroxybenzoic acid. Vanillin and its mixture with P-hydroxybenzoic acid at the higher concentration affected N nutrient distribution by increasing
the proportion of N in roots and decreasing the proportion in stems and leaves. We conclude that the vanillin and phenolics in soil might produce allelopathic effects on Chinese fir by inhibiting N absorption and distribution which then result in productivity decline. |
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 酚类物质对杉木幼苗~(15)N养分吸收、分配的影响.pdf |
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