硼在土壤中的吸附-解吸及其对植物吸收硼的影响
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* 国家自然科学基金39370415


ADSORPTION-DESORPTION OF BORON IN SOILS AND ITS EFFECT ON BORON UPTAKE OF PLANT
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    摘要:

    本文对湖北省几种主要旱地土壤进行了硼的吸附-解吸实验,同时对这些土壤上油菜幼苗吸收硼进行了试验,并用Freundlich和Langmuir等温吸附方程对实验结果进行了拟合。从中发现,一些土壤硼的解吸存在着明显的滞后解吸现象,这种现象可用滞后系数(△K+△n)来定性描述。当△K+△n>0.25,硼的滞后解吸比较明显。硼在土壤中的滞后解吸,原因较为复杂,实验结果表明,土壤无定形氧化铝和闭蓄态羟基氧化锰与硼的滞后解吸有明显的正相关。植物从土壤中吸收硼的数量与土壤硼的吸附-解吸特性有比较密切的关系,硼滞后解吸明显的土壤,其植物吸收硼的数量相对较少,如外源施硼,植物在一定程度上可克服土壤硼滞后解吸特性对吸收硼的影响。

    Abstract:

    Adsorption and desorption of boron in the main upland soils of Hubei Province and the boron uptake of rape shoot were studied. The experimental results were fitted to the Freundlich and Langmuir isotherm equations. It was found that there was a significant hysteretic desorption of boron in some tested soils. In this case, the shape of adsorption curve was different from that of desorption curve, and Ke' or n' of desorption equation was larger than that of adsorption equation. Hence, the difference due to hysteretic desorption could be described by the hysteretic coefficient (△K+△n) qualitatively. When △K+△n>0.25, the hysteretic desorption was more significant. The reasons for the hysteretic desorption of boron in soil were very complicated. The contents of amorphous Al and Mn oxyhydroxides were positively correlated with the hysteretic coefficient in the experiment (n=11, r=0.790** and 0.744**,respectively).The boron content of plant had a better relationship with adsorption-desorption property of soils. The value of △K+△n was significantly correlated with the content of boron taken up by the plant shoot(r=-0.761**, n=11). In the case of boron application, the effect of hysteretic desorption on boron uptake by plant could be decreased partly, and plant could absorb more boron in the soil.

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朱端卫,皮美美,刘武定.硼在土壤中的吸附-解吸及其对植物吸收硼的影响[J].土壤学报,1998,35(1):70-75. DOI:10.11766/trxb199603080110 Zhu Duan-wei, Pi Met-met, Liu Wu-ding. ADSORPTION-DESORPTION OF BORON IN SOILS AND ITS EFFECT ON BORON UPTAKE OF PLANT[J]. Acta Pedologica Sinica,1998,35(1):70-75.

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  • 收稿日期:1996-03-08
  • 最后修改日期:1997-05-14
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  • 在线发布日期: 2013-02-25
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