银杏凋落叶对生菜生长及生理特性的影响

采用盆栽试验,通过向土壤中施加不同量(0、2.5、5.0、7.5、10.0 g/kg)的银杏凋落叶,研究银杏凋落叶对生菜生长及生理特性的影响。结果表明:在土壤中施用银杏凋落叶后显著抑制了生菜的生长,其根长、茎粗和株高均显著下降,地上部鲜物质量较对照分别减少了11.38%、22.54%、32.37%、34.82%;各处理生菜叶片中叶绿素含量较对照均显著减少,且随凋落叶施用量的增多呈现降低趋势,10.0g/kg银杏凋落叶处理下的叶绿素a、叶绿素b、总叶绿素以及类胡萝卜素含量分别比对照减少45.24%、56.25%、47.72%以及38.08%;生菜叶片中超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性、过氧化氢酶(CAT)活性较对照均有所增强,且各处理中后两者酶活性均显著高于对照;各处理生菜叶片丙二醛(MDA)含量均小于对照,且随凋落叶施用量增多呈增加趋势。研究认为,银杏凋落叶对生菜生长及抗性生理产生化感作用,综合表现为抑制作用。

Effects of Leaf Litters of Ginkgo biloba on Growth and Physiological Characteristics of Lactuca sativa

A pot experiment was conducted to study the effects of Ginkgo biloba leaf litters on the growth and physiological characteristics of Lactuca sativa, in which the amounts of Ginkgo biloba leaf litters added into soil were 0 (CK), 2.5, 5.0, 7.5 and 10.0 g/kg, respectively. The results showed that, compared to the CK treatment, the treatments of Ginkgo biloba leaf litters significantly inhibited the growth of lettuce, which decreased significantly the root length, stem diameter and plant height of Lactuca sativa, decreased the fresh weight of aerial part of Lactuca sativa by 11.38%, 22.54%, 32.37% and 34.82% respectively, decreased significantly the content of chlorophyll in the leaves of Lactuca sativa, and the treatment of 10.0 g/kg of Ginkgo biloba leaf litters decreased the contents of chlorophyll a, chlorophyll b, total chlorophyll and carotenoid in the leaves of Lactuca sativa by 45.24%, 56.25%, 47.72% and 38.08%, respectively; Compared to the CK treatment, the treatments of Ginkgo biloba leaf litters increased the activities of SOD, POD and CAT in in the leaves of Lactuca sativa, with the latter two increased significantly; The content of MDA in the leaves of Lactuca sativa decreased with the increase ginkgo leaf litters. On the whole, Ginkgo biloba leaf litters can produce the allelopathy on the growth and physiological resistance of Lactuca sativa, thus, comprehensively present a function of inhibition.