桉树凋落物浸提液对任豆种子萌发及幼苗生长的影响  

Effects of Eucalyptus Litter Extract on Seed Germination and Seedling Growth of Zenia insignis Chun

作　　者：罗春宇 马秋妮 覃宝山 覃勇荣 

机构地区：[1]河池学院化学与生物工程学院,广西 宜州

出　　处：《植物学研究》2023年第5期257-268,共12页Botanical Research

摘　　要：为了说明桉树凋落物浸提液对任豆种子萌发及幼苗生长的影响,为桉树人工林改造和林分结构优化提供理论依据,通过室内人工模拟试验,选择了5个不同浓度梯度的桉树凋落物浸提液进行培养皿发芽和盆栽试验。结果表明:1) 桉树凋落物浸提液对任豆种子萌发及幼苗生长的化感作用具有“低促高抑”的浓度效应:在质量浓度为0 g/mL~0.05 g/mL的范围内,对任豆种子萌发和幼苗生长具有一定的促进作用;当浓度超过0.10 g/mL时,对任豆种子萌发和幼苗生长具有明显的抑制作用。2) 根据综合化感指数的计算结果判断,桉树凋落物浸提液对任豆种子萌发的化感作用,大于其对任豆幼苗生长的化感作用。因为桉树凋落物浸提液化感物质对任豆种子萌发及幼苗生长的影响作用相对较小,所以,将任豆作为桉树人工林的混交树种进行林分改造,在理论上是可以尝试的。To demonstrate the influence of Eucalyptus litter extract on the germination and seedling growth of Zenia insignis for a providing theoretical basis for Eucalyptus plantation reconstruction and opti-mization of forest stand structure, an indoor artificial simulation experiment was conducted using five different concentration gradients of Eucalyptus litter extracts for petri dish germination and potted experiments. The results showed that: 1) Eucalyptus litter extract had a concentration effect of “low promotion and high inhibition” on the allelopathy of seed germination and seedling growth of Z. insignis. In the mass concentration range of 0 g/mL~0.05 g/mL, it had a certain promoting ef-fect on the seed germination and seedling growth of Z. insignis;When the concentration exceeds 0.10 g/mL, it has a significant inhibitory effect on the germination and seedling growth of Z. insignis seeds. 2) According to the calculation results of the comprehensive allelopathy index, the allelopa-thy of Eucalyptus litter extract on the seed germination of Z. insignis is greater than its allelopathy on the seedling growth of Z. insignis. Due to the relatively small impact of liquefied substances ex-tracted from Eucalyptus litter on seed germination and seedling growth of Z. insignis, it is theoreti-cally feasible to use Z. insignis as a mixed tree species in Eucalyptus plantations for stand transfor-mation.

关 键 词：桉树人工林 凋落物浸提液 任豆 种子萌发 幼苗生长 化感作用 

分 类 号：S71[农业科学—林学]