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根际酸化作用对杨树无性系磷营养效率的影响
引用本文: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,2003,14(10):1607-1611.
作者姓名:张焕朝  王改萍  徐锡增  徐成凯  胡正义
作者单位:1. 南京林业大学森林资源与环境学院,南京,210037
2. 中国科学院南京土壤研究所,南京,210008
基金项目:国家自然科学基金资助项目(39770610)
摘    要:应用土培盆栽技术,研究了杨树P营养效率的无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。各用土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
文章编号:1001-9332(2003)10-1607-05
修稿时间:2001年11月12

Effects of rhizosphere acidification on phosphorus efficiency in clones of poplar
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,2003,14(10):1607-1611.
Authors:ZHANG Huanchao  WANG Gaiping  XU Xizeng  XU Chengkai  HU Zhengyi
Institution:College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China. hczhang@njfu.edu.cn
Abstract:Effects of rhizosphere acidification on P efficiency 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 replicates of each treatment, with a pot of 40 kg soil in a randomized block. The results showed that high P efficiency clones, such as S17, S19, and 105, could decrease their pH values in rhizosphere under P deficiency stress much stronger than clones 106, 797, I-69, 1388, and 3,244, which were low P efficiency clones. The most decrement of pH for the former even accounted to 1.32 pH units and the ratios of the decrements were over 10% in comparison with the pH values in bulk soil. Whereas for the latter less than 0.21 pH units and 2.5% of the decreasing ratio respectively. In contrast to low P efficiency clones, high P efficiency clones could acidify their rhizosphere through a kind of specific mechanism because the pH values in rhizosphere of high P efficiency clones were gradually decreased corresponding with the intensity of P deficiency 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.kg-1, respectively, obviously higher than those of the other five low P efficiency clones, which all were below 2.00 mg.kg-1 under P deficiency stress, and the summation percentages of available P in rhizosphere were over 60% for all high P efficiency clones, but less than 10% for low P efficiency clones. The amounts of P taken up by high P efficiency clones were statistically greater than by low P efficiency clones. Regression analysis also indicated that the increment of available P in rhizosphere was closely correlated with the decrement of pH values in rhizosphere under P deficiency stress. This demonstrated the impact of rhizosphere acidification on availability of rhizosphere P, and identified that high P efficiency clones could enhance their contents of available P in rhizosphere, absorb more P and thus grow better through rhizosphere acidification depended on deficiency stress.
Keywords:Poplar  Clone  Phosphorus efficiency  Rhizosphere acidification  Available phosphorus in rhizo-sphcre  
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