高铝低磷对油茶生长及其根系分泌有机酸的影响

以野生油茶和人工栽培油茶为研究对象,采用水培试验研究高铝低磷胁迫对油茶幼苗生长及其根系有机酸分泌的影响。结果表明,在无磷(-P)情况下,铝毒对油茶幼苗的生长不利,而在铝胁迫下,磷的加入(0.2 mmol·L^-1)能够显著降低铝的胁迫;无论是野生油茶还是人工栽培油茶,土壤中铝达到一定浓度,会显著降低油茶根系有机酸总量的分泌,而高铝低磷胁迫都会显著降低其根系分泌的总有机酸量,以及柠檬酸和苹果酸的含量。因此,在油茶种植过程中科学合理的施用磷肥,一定程度上能够减少铝毒对油茶的伤害。

Effects of High-Al and Low-P Stress on the Growth of Camellia oleifera Abel. and Organic Acid Exudation from Roots

This article takes wild and cultivated camellia oleifera as the research objects.Study on the effects of high aluminum(high-Al)and low phosphorus(low-P)stress on the growth of Camellia oleifera seedlings and the secretion of organic acids of its roots by hydroponic experiments.The results showed that in the absence of phosphorus(-P),aluminum toxicity had an adverse effect on the growth of Camellia oleifera seedlings,while under aluminum stress,the addition of phosphorus(0.2 mmol·L^-1)could significantly reduce the aluminum stress.Whether it is wild or cultivation camellia oleifera,reaching a certain concentration of aluminum in the soil could significantly reduce the secretion of total organic acids from the roots of the camellia oleifera.The stress of high-Al and low-P will significantly reduce the total organic acid secreted by its roots,as well as the content of citric acid and malic acid.Therefore,scientific and reasonable application of phosphate fertilizers in the process of planting Camellia oleifera can reduce the damage of aluminum toxicity to Camellia oleifera to a certain extent.