Effect of aluminum on growth and isotope 15N absorption, allocation and utilization of potted Malus hupenhensis | 铝对盆栽平邑甜茶生长及吸收•分配和利用15N的影响____

Chinese. ［目的］为酸化果园土壤治理提供理论依据。［方法］以盆栽平邑甜茶为试材，采用15N同位素示踪技术研究铝对其生长及吸收、分配和利用_15N的影响。［结果］高浓度铝处理（1 000 mg/kg）显著抑制植株的生长与15N吸收、分配和利用，其株高、茎粗、地上部干重和地下部干重分别为21.81 cm、0.29 cm、1.91 g、2.94 g，分别为对照的87.87%、85.29%、51.76%、79.24%。 低浓度铝处理（250 、500 、750 mg/kg）与对照相比，均以地下部15N吸收征调能力（Ndff）最高，其次为地上部；高浓度铝处理则以地上部Ndff最高，其次为地下部；不同的铝浓度处理，植株对15N分配情况不一致，低浓度铝处理与对照相比，均为地上部高于地下部，在高浓度铝处理下，则为地下部高于地上部；高浓度铝处理下，其15N吸收量和利用率分别为0.76 mg和2.4667%，分别为对照的43.75%和52.11%。［结论］在低浓度铝处理下，平邑甜茶的生长及15N的吸收、分配、利用率的提高不会受到影响；高浓度铝胁迫则抑制平邑甜茶的生长及15N的吸收、分配和利用。

English. ［Objective］ The theoretic reference for the treatment of acidic orchard soil was provided through the experiment. ［Method］ The effect of the aluminum, which was traced with isotope 15N, on the Malus hupenhensis growth and the absorption, allocation and utilization of 15N in the plant in potted experiment. ［Result］ The results showed that the treatment of high aluminum stress could more significantly restrain plant growth, and the absorption, allocation and utilization of 15N inside plant and the height of plant, diameter of stem , dry weight of aerial and underground part of the treatment were 21.81 cm，0.29 cm，1.91 g and 2.94 g, which were 87.87%, 85.29%, 51.76% and79.24% more than those of CK, respectively. Under the treatment of low aluminum stress（250, 500 or 750 mg/kg）, the content of 15N absorption and utilization efficiency(Ndff) in the tissue of underground part was higher than that in aboveground part, under the treatment of high aluminum stress, the content of Ndff in the tissue of aboveground part was higher than that in underground part, compared with that of CK, respectively. The treatments of different aluminum stress resulted in the various allocation of 15N inside plant, under the treatment of low aluminum stress the content of 15N in aerial part was higher than that in subterranean part and high aluminum stress the content of 15N in subterranean part was higher than that in aerial part, compared with that of CK, respectively. Under the treatment of high aluminum stress, the amount of 15N absorption and utilization efficiency was 0.76 mg and 2.466 7%，which were 43.75% and 52.11% higher than those of CK. ［Conclusion］ The treatment of low concentration of aluminum did not affect the Malus hupenhensis growth and the absorption, allocation and utilization of 15N in the plant and the high level of aluminum stress would inhibit the Malus hupenhensis growth and the absorption, allocation and utilization of 15N in the plant._