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研究了白桦的根、枝、叶,落叶松的根、枝、叶和皮不同浓度水浸液(5.0、12.5、25.0、50.0和100.0mg.mL-1)对另一树种种子萌发和当年生播种苗生长的化感作用.结果表明:落叶松不同器官水浸液(根5.0mg.mL-1除外)处理均抑制白桦种子的萌发,其平均发芽率为:对照(75%)>根(66%)>皮(59%)>枝(58%)>叶(54%),随浓度增加,根、枝水浸液的抑制作用增强,而叶、皮水浸液的抑制作用减弱.落叶松各器官水浸液对白桦胚根和胚轴生长具有较强的抑制作用,且以100.0mg.mL-1浓度的叶水浸液抑制作用最强,胚根和胚轴长分别降低38%和55%(P<0.05).落叶松枝、叶水浸液处理对白桦播种苗的苗高、地径及生物量有一定的促进作用,根、皮水浸液则具有抑制作用.白桦各器官水浸液能促进落叶松种子的萌发,根和枝的水浸液促进胚轴生长,叶的水浸液抑制胚轴生长,50.0和100.0mg.mL-1浓度的叶水浸液处理的种子胚轴分别较对照降低27%和28%(P<0.05).其对落叶松播种苗生长的影响以促进作用为主,5.0mg.mL-1浓度的白桦叶水浸液处理的落叶松苗高、地径、生物量分别较对照高54%、60%和100%(P<0.05).白桦与落叶松之间存在明显的化感作用,混交可能对林木生长产生一定的促进作用.
The effects of different concentrations (5.0, 12.5, 25.0, 50.0 and 100.0 mg.mL-1) of roots, branches, leaves and roots of Larix gmelinii on the seed germination and current perennial The results showed that the germination of Betula platyphylla seeds was inhibited by the treatment with different aqueous extracts of larch (except 5.0mg.mL-1), the average germination rate was 75% 66%)> skin (59%)> branches (58%)> leaves (54%). With the increasing of concentration, the inhibitory effect of root and branch aqueous extracts increased, The water extracts of various organs had a strong inhibitory effect on the growth of the bark and hypocotyls of Betula platyphylla, and the inhibitory effect was the strongest at the concentration of 100.0mg.mL-1, the axial length of the radicle and the embryo decreased by 38% And 55%, respectively (P <0.05). The treatment of the branches and leaves of Larix gmelinii had some effects on the seedling height, diameter and biomass of Siberian Birch sowing seedlings, Aqueous flooding could promote the germination of larch seeds, the aqueous solution of roots and branches promoted the growth of hypocotyls, and the aqueous suspension of leaves inhibited the growth of hypocotyls. The seed embryos treated with aqueous extracts of 50.0 and 100.0 mg.mL-1 axis (P <0.05) .It had a significant effect on the growth of larch sown seedlings. The larch seedlings treated with 5.0 mg.mL-1 of birch Diameter and biomass were 54%, 60% and 100% higher than those of the control (P <0.05) .Also obvious allelopathic effects were found between the birch and the larch.