虫害及水分条件对胡杨(Populus euphratica)叶片中酚类物质及氮含量的影响

Effect of Insect and Water Condition on Phenolic Compounds and Nitrogen Concentrations in Leaves of Populus euphratica

研究了不同土壤水分条件下虫害胁迫对胡杨叶片中酚类物质含量及氮含量的影响。结果表明,无河水漫灌的胡杨的虫害叶(10%～15%)的总酚含量显著高于河水漫灌的样地中胡杨虫害叶(10%～15%)的总酚含量(P<0.05);河水漫灌的胡杨的健康叶、虫害叶(<10%)的缩合单宁含量显著高于没有河水漫灌的胡杨的健康叶、虫害叶(<10%)的缩合单宁含量(P<0.05);河水漫灌的胡杨的虫害叶(<10%)、虫害叶(10%～15%)的黄酮含量分别显著高于没有河水漫灌的胡杨的虫害叶(<10%)、虫害叶(10%～15%)的黄酮含量(P<0.05);河水漫灌的胡杨叶片的氮含量显著高于无河水漫灌的胡杨叶中氮含量。虫害程度不同的叶片中酚类物质和氮含量的含量变化顺序是:健康叶<虫害叶(<10%)<虫害叶(10%～15%);在虫害胁迫和土壤水分双重胁迫下,胡杨可以通过其自身的防御机制根据虫害程度和资源竞争压力来有效分配有效资源以适应外部环境的胁迫。

The objectives of this study were to investigate the effect of insect and soil water contents on phenolic compounds and nitrogen concentrations in leaves of Populus euphratica. phenolic concentration of insect damage leaves （10%-15%）without fiver flooding that of insect damage leaves （10%-15%）with fiver flooding; condensed tannins Our results showed that total was significantly higher than of healthy leaves and insect damage leaves （ 〈10% ） with fiver flooding were significantly higher than that of healthy leaves and insect damage leaves （〈10%）without fiver flooding; flavonoids of insect damage leaves （〈10% ＆ 10%-15% ）with fiver flooding were significantly higher than that of healthy leaves and insect damage leaves （〈10%）without river flooding; Insect damage leaf nitrogen concentrations with fiver flooding were higher than that without fiver flooding. increased phenolic compounds and nitrogen concentrations with the order as healthy leaves 〈 damage leaves（ 〈 10%）〈 damage leaves （10%-15%）. Populus euphratica will allocate available resource based on insect damage degree and resource competition stress to respond environmental stress.