桉树皮对小白菜种子发芽的影响

Effect of Eucalyptus Bark on the Germination of Pakchoi Seeds

桉树皮作为一种常见有机废弃物,在作为基质使用时需进行无害化处理,种子发芽实验作为高等植物毒理实验的典型方法之一,可以科学合理地反应桉树皮在利用时的无害化状况。本试验选择不同桉树皮处理(水处理、碱处理桉树皮和自然腐熟桉树皮)作为小白菜种子发芽基质,研究各桉树皮处理对小白菜种子发芽的影响。结果表明:水处理、碱处理的桉树皮基质抑制小白菜种子发芽,自然腐熟桉树皮对小白菜种子发芽无抑制作用,发芽率、发芽势与土壤处理无显著差异,发芽指数>80%,幼苗的株高、根长、鲜质量分别较土壤处理提高了26.9%,26.57%,89.36%;相关性分析表明,种子发芽主要受全氮、碱解氮、速效钾、C/N影响。研究结果说明自然腐熟桉树皮可以开发利用。

Eucalyptus bark is a common organic waste and should be treated when used as substrate. Seed germination experiment is one of the typical toxicological experiments for higher plants and can be used to test the toxicity of eucalyptus bark. In this context eucalyptus barks were treated with water, alkali or composting（naturally well composting） and were used as germination substrates to culture Pakchoi with the soil substrate as the control to observe the effect of the eucalyptus bark treatments on the germination of Pakchoi seeds. The results showed that the eucalyptus barks treated with water or alkali suppressed the seed germination of Pakchoi, whereas the naturally well-composted eucalyptus barks did not inhibit the seed germination of Pakchoi. The Pakchoi seeds cultured on the naturally well-composted barks were not significantly different in germination rate and germination potential from the control, and the Pakchoi had a seed germination index of 〉80%, and increased its plant height, root length, and fresh weight by 26.9%,26.57% and 89.36%, respectively. The correlation analysis showed that the seed germination of Pakchoi was mainly affected by total nitrogen, available nitrogen, available potassium and C/N.This indicates that the naturally well-composted eucalyptus barks can be used for development and utilization.