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采用盆栽试验,研究了巨桉凋落叶分解初期对受体植物老芒麦幼苗生长和抗性生理的影响。试验设对照(CK)和4种凋落叶处理,分别将0(CK),25,50,100,150g巨桉凋落叶与8kg土壤混合,播种老芒麦。在播种后30,40,50和90d测定老芒麦株高、生物量和几种抗性生理指标。结果表明,1)凋落叶在施入土壤90d内,显著抑制了老芒麦幼苗的高生长和生物量;2)在低凋落叶量、短时间处理下,老芒麦幼苗叶片SOD与CAT活性有所升高,但处理量增大或处理时间延长时,2种酶的活性降低,且各处理POD在90d内始终受到显著抑制;3)各处理老芒麦叶片MDA含量在50d内均大于CK,且随处理量增大呈渐增的趋势,90d时各处理MDA含量均小于CK;4)各处理老芒麦叶片可溶性糖含量在各测定时间均显著高于CK,可溶性蛋白含量则均显著低于CK;5)巨桉凋落叶在土壤中的作用强度随分解时间延长呈先强后弱的变化规律,高凋落叶量处理的化感效应比低凋落叶量处理快且强,各凋落叶处理对老芒麦的化感综合抑制效应表现为:150g>50～100g>25g。综合各项指标可以看出,巨桉凋落叶在土壤中分解初期对老芒麦幼苗产生了强烈的化感作用。
Pot experiments were conducted to study the effects of litter decomposition of Eucalyptus grandis on the growth and physiological resistance of the plant Reaumuria. In the experiment, CK (CK) and 4 kinds of litter were used to treat E. grandis by mixing 0, 25, 50, 100 and 150 g of E. grandis litter with 8 kg of soil respectively. The plant height, biomass and several resistant physiological indexes were tested at 30, 40, 50 and 90 days after sowing. The results showed that: 1) litter leaf in the soil 90 days, significantly inhibited the high growth and biomass of the old seedlings; 2) under low litter leaf, short-term treatment, the SOD and CAT activity The activity of the two enzymes decreased, and the POD of all treatments was always significantly inhibited within 90 days. 3) The content of MDA in leaves of all treatments was higher than that of the control CK. The content of MDA in leaves of all treatments was lower than that of CK at the 90th day. (4) The contents of soluble sugar in leaves of all treatments were significantly higher than those in CK Significantly lower than that of CK. (5) The intensity of litterfall decline in soil was stronger than that of CK. The allelopathic effect of high litterfall treatment was faster and stronger than that of low litterfall treatment. The effects of litter leaf treatment on the allelopathic inhibitory effect of Elymus mirifica showed as follows: 150g> 50 ~ 100g> 25g. According to the indexes, it can be seen that the litter of Eucalyptus grandis had a strong allelopathic effect on the seedlings of Erigeron barbarum in the initial stage of soil decomposition.