【摘要】 兴安落叶松是生产落叶松单宁的重要原材料,随着天保工程的实施,使得主要原料树皮供应紧张。通过2003～2004年的测定结果表明,除现用的树皮(8.8%～15.4%)生产原料外,根系(约7.8%)、树枝(1.0%～7.0%)甚至叶片(4.0%～8.0%)都可以成为生产原料,而树干木质部含量过低(0.6%～1.4%)不宜成为生产原材料。不同季节单宁含量差异结果表明,秋季(9～10月)的落叶松单宁含量都显著高于其它季节,因此,原材料的收集应该在秋季。此外,叶片单宁含量与光照强度呈现显著正相关。更多还原

【Abstract】 The main raw material for tannin-related products is Larix gmelinii(Rupr.)Rupr.in northeast China.However,bark materials are short of supply since the implementation of forest protection.The results in this study(carried out during 2003-2004)showed that roots(tannins about 7.8 %),branches(1.0 %-7.0 %)even leaves(4.0 %-8.0 %)can be used as raw materials beside bark(8.8 %-15.4 %)as the most popular raw materials.However,xylem in stem is not a suitable material because of the too low tannin content(0.6 %-1.4 %).The data of seasonal changes of tannin in different organs showed a general pattern,i.e.different organs in autumn(Sept.to Oct.)had significantly higher content of tannin compared to other seasons,indicating that autumn is the optimal time for material collection.Furthermore,tannin content in leaves is positively correlated with intensity of sunlight.更多还原