香草醛对杉木幼苗养分吸收的影响  

EFFECT OF VANILLIN ON NUTRIENT ABSORBENCY OF CHINESE FIR SEEDLINGS

作　　者：陈龙池[1] 廖利平[1] 汪思龙[1] 

机构地区：[1]中国科学院沈阳应用生态研究所会同森林生态实验站,沈阳110016

出　　处：《植物生态学报》2003年第1期41-46,共6页Chinese Journal of Plant Ecology

基　　金：中国科学院知识创新工程资助项目 (KZCX2-40 6 )

摘　　要：通过模拟实验研究了不同浓度的香草醛对杉木 (Cunninghamialanceolata)幼苗养分吸收和根系活力的影响 ,结果发现 ,当浓度为 1mmol·L-1时 ,香草醛能够显著抑制杉木幼苗对NO-3 、NH+ 4、SO2 -4 及HPO2 -4 离子的吸收和根系活力 (p <0 .0 1) ,而浓度为 1× 10 -2 mmol·L-1时香草醛却促进了杉木幼苗对HPO2 -4 离子的吸收 (p <0 .0 1)。这说明高浓度的香草醛能够通过化感作用对杉木幼苗产生影响 ,降低杉木幼苗的根系活力 ,进而减少了杉木幼苗对养分离子的吸收 ,从而影响了杉木幼苗的生长。Chinese fir (Cunninghamia lanceolata) is a dominant, native commercial tree species in South China known for rapid growth and high quality timber. Replanting this species in pure stands has resulted in extensive areas that are poorly established and have low productivity. This serious problem has attracted nationwide attention. Recent research suggests that low productivity is caused by allelopathy. According to some laboratory studies, phenolics such as vanillin extracted from Chinese fir roots, fresh leaves, and litter inhibit seed germination and growth of seedlings. When soil phenolics have a concentration higher than the threshold of toxicity they will inhibit Chinese fir growth. However, it has been unclear how the phenolics affect the Chinese fir. The purpose of this study is to determine the concentration at which vanillin develops an allelopathic effect on nutrient absorbency in Chinese fir. The effects of different concentrations of vanillin on nutrient absorbency in Chinese fir seedlings were examined using a culture solution. The mother solution (MS) was made by dissolving nutrients (49.5 g NH 4NO 3, 57 g KNO 3, 13.2 g CaCl 2·2H 2O, 11.1 g MgSO 4·7H 2O, 5.1 g KH 2PO 4 and 1.179 g Na 2EDTA) in 1 500 ml distilled water. The mother solution of 1 000 mmol·L -1 vanillin was made by dissolving 15.2 g vanillin in 100 ml distilled water which was then diluted to six different levels of culture solution: 10, 1, 0.1, 0.01, 0.001, and 0.000 1 mmol·L -1 , each with nutrient solutions of 0.5 MS. Distilled water was used as the control. The solution was adjusted to pH 5.1 with 100 mmol·L -1 HCl or NaOH. One_year_old Chinese fir seedlings were grown in separate plastic containers and ventilated every day using an electromotor. Each treatment was replicated three times. After seven days, concentrations of NO - 3, NH + 4, SO 4 2- and HPO 4 2- ions in the culture solutions were analyzed. Results showed that vanillin at higher concentrations inhibited uptake of these

关 键 词：香草醛 杉木幼苗 养分吸收 根系活力 化感作用 离子吸收 

分 类 号：S791[农业科学—林木遗传育种]