Amorpha fruticosa and Amygdalus pedunculata are common plant species used for greening construction in arid and semi-arid region of Northwest China. In order to explore the feasibility of greening construction and ecological restoration by A. fruticose with A. pedunculata, we exami-ned the allelopathic effects of five concentrations of aqueous leaf extracts of A. fruticosa (0.025, 0.05, 0.10, 0.15 and 0.20 g·mL-1) on eight A. pedunculata varieties (YY1, YY3, YY4, YY5, YY6, SM6, SM7 and SM8), using the methods of paper-petri dish and soilless culture. The results showed that when the concentration of A. fruticosa leaf extracts were 0.025 and 0.05 g·mL-1, the seed germination and seedling growth of YY1 and SM6 were significantly better than other varieties. With increasing concentration of A. fruticosa leaf extracts, the catalase activity of A. pedunculata seedlings first increased and then decreased. The activities of peroxidase and superoxide dismutase, and the contents of soluble protein and chlorophyll showed a downward trend, while the contents of malondialdehyde and soluble sugar and the permeability of cell membrane gradually increased. Results of the principal component and cluster analysis showed that the growth potential of A. pedunculata decreased with the order of YY1, SM6, SM8, SM7, YY6, YY3, YY5 and YY4 under the allelopathic effect of A. fruticose. In conclusion, the artificial collocation and mixed planting of low-density of A. fruticosa with YY1 and SM6 were beneficial to seed germination and seedling growth of A. pedunculata.
紫穗槐和长柄扁桃是中国西北干旱和半干旱地区的常见绿化植物。为探索紫穗槐搭配长柄扁桃进行绿化建设和生态修复的可行性,采用培养皿滤纸法和土培法测定了5种质量浓度的紫穗槐叶片浸提液(0.025、0.05、0.10、0.15和0.20 g·mL-1)对长柄扁桃8个品种(YY1、YY3、YY4、YY5、YY6、SM6、SM7和SM8)的化感作用。结果表明: 当浸提液浓度为0.025和0.05 g·mL-1时,长柄扁桃YY1和SM6品种的种子萌发和幼苗长势显著优于其他品种。随紫穗槐叶片浸提液浓度升高,长柄扁桃幼苗过氧化氢酶活性呈先升高后降低的趋势。此外,随叶片浸提液浓度升高,过氧化酶和超氧化物歧化酶活性以及可溶性蛋白和叶绿素含量降低,而丙二醛和可溶性糖含量及细胞膜透性呈现逐渐上升的趋势。主成分及聚类分析表明,在紫穗槐化感作用下,长柄扁桃的生长势按照YY1、SM6、SM8、SM7、YY6、YY3、YY5和YY4顺序依次降低。综上,低密度紫穗槐与长柄扁桃YY1和SM6品种人工搭配混合种植有利于促进长柄扁桃种子萌发和幼苗生长。.
Keywords: Amorpha fruticose; Amygdalus pedunculata; seed germination; seedling growth.