根际酸化作用对杨树无性系磷营养效率的影响

摘要/Abstract

摘要： 应用土培盆栽技术,研究了杨树P营养效率的元性系差异与根际酸化作用的关系.P处理设4个水平,分别为0、40、80和120mg·kg^-1(P₂O₅),每个处理重复3次,各用±40kg,随机排列.结果表明,在缺P胁迫下,P营养高效型无性系S17、S19和105的根际pH值明显降低,最大为1.32个单位,降幅均在10%以上;而P营养低效型无性系106、797、I-69、1388和3244的根际pH值的降低则很小,最大的仅为0.21个单位,降幅均在2.5%以下.高效型无性系的根际pH值,随缺P胁迫的增加而逐渐降低,一旦缺P胁迫缓和,根际pH值随之增高.低效型无性系则不具有这种反应机理.S17、S19和105在缺P胁迫环境下,根际有效磷分别为2.64、3.27和3.28mg·kg^-1,根际有效磷的积累率均在60%以上;而无性系106、797、I-69、1388和3244的根际有效磷均不足2.00mg·kg^-1,根际有效磷的积累率不足10%.高效型无性系在缺P胁迫环境下对P的吸收量显著高于低效型无性系.统计分析也证明,缺P胁迫条件下,无性系根际有效磷的积累与根际pH值降低呈显著相关,说明根际酸化作用是根际有效磷增加的原因.

关键词: 杨树, 无性系, P营养效率, 根际酸化作用, 根际有效磷

Abstract: Effects of rhizosphere acidification on Pefficiency in different poplar clones were conducted by the method of soil culture in greenhouse.Potassium dihydrogen phosphate was applied to furnish 0, 40, 80, and 120 mg P₂O₅ kg^-1.The experiment consisted of three replicatesof each treatment, with a pot of 40 kg soil in a randomized block.The results showed that high Pefficiency clones, such as S17, S19, and 105, could decrease their pHvalues in rhizosphere under P deficiency stress much stronger than clones 106, 797, 1-69, 1388, and 3244, which were low Pefficiency clones.The most decrement of pH for the former even accounted to 1.32 pHunits and the ratios of the decrements were over 10% in comparison with the pHvalues in bulk soil.Whereas for the latter less than0.21 pH units and 2.5% of the decreasing ratio respectively.In contrast to low P efficiency clones, high Pefficiency clones could acidify their rhizosphere through a kind of specific mechanism because the pH values in rhizosphere of high Pefficiency clones were gradually decreased corresponding with the intensity of Pdeficiency stress and vice versa.The amounts of available P in rhizosphere of clone S17, S19, and 105 reached 2.64, 3.27, and 3.28 mg穔g^-1, respectively, obviously higher than those of the other five low P efficiency clones, which all were below 2.00 mg穔g^-1 under Pdeficiency stress, and the summation percentages of available Pin rhizosphere were over 60% for all high Pefficiency clones, but less than 10% for low P efficiency clones.The amounts of P taken up by high P efficiency clones wore statistically greater than by low Pefficiency clones.Regression analysis also indicated that the increment of available Pin rhizosphere was closely correlated with the decrement of pHvalues in rhizosphere under Pdeficiency stress.This demonstrated the impact of rhizosphere acidification on availability of rhizosphere P, and identified that high Pefficiency clones could enhance their contents of available Pin rhizosphere, absorb more Pand thus grow better through rhizosphere acidification depended on deficiency stress.

Key words: Poplar, Clone, Phosphorus efficiency, Rhizosphere acidification, Available phosphorus in rhizo-sphcre

中图分类号:

S718.43

张焕朝, 王改萍, 徐锡增, 徐成凯, 胡正义. 根际酸化作用对杨树无性系磷营养效率的影响[J]. 应用生态学报, 2003, (10): 1607-1611.

ZHANG Huanchao, WANG Gaiping, XU Xizeng, XU Chengkai, HU Zhengyi . Effects of rhizosphere acidification on phosphorus efficiency in clones of poplar[J]. Chinese Journal of Applied Ecology, 2003, (10): 1607-1611.

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