钾对苹果树水分利用效率及有关参数的影响
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EFFECT OF POTASSIUM ON WATER USE EFFICIENCY AND RELEVANT PARAMETERS OF APPLE TREES
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    摘要:

    以2年生盆栽新红星/平邑甜菜苹果树为试材,初步探讨了土壤不同水分状况下钾对水分利用效率(WUE)及有关参数的影响,结果表明,充足供水时,施钾肥植株的气孔导度(Gs)为增大,光合速率(Pn)和蒸腾速率(Tr)同时被提高,但Tr的提高幅度更大,导致了WUE的降低;土壤干旱时,钾可明显提高植株的WUE,不同处理的WUE大小顺序为:高K>中K>低K>CK,植株施钾肥后,Gs增大,Pn被提高,但Tr却下降,说明WUE的改善是通过提高光合和降低蒸腾两条途径实现的。

    Abstract:

    2-year-old potted Starkrimson/M. hupenensis Rehd. apple trees were used as materials in the experiment Effect of potassium on water use efficiency and relevant parameters of plants under conditions of different soil water status was preliminarily studied. The results showed that under the condition of adequate soil water content, stomatal conductance (Gs),photosynthetic rate (Pn) and transpiration rate (Tr) were all improved for trees applied potassium fertilizer, which resulted in the reduction of WUE because Tr was increased more than that Pn was. However, under the condition of soil drought, WUE of trees applied potassium fertilizer was apparently promoted as compared with contrast ones. WUE of trees with different potassium level was increased in the order: high K > medium K > low K For treated plants under soil drought, as a result Gs and Pn were enhanced but Tr lowered, the improvement of WUE was due to both the increase of photosynthetic rate and the decrease of transpiration rate.

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曲桂敏,束怀瑞,王鸿霞.钾对苹果树水分利用效率及有关参数的影响[J].土壤学报,2000,37(2):257-262. DOI:10.11766/trxb199810210214 Qu Gui-min, Shu Huai-An, Wang Hong-xia. EFFECT OF POTASSIUM ON WATER USE EFFICIENCY AND RELEVANT PARAMETERS OF APPLE TREES[J]. Acta Pedologica Sinica,2000,37(2):257-262.

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  • 收稿日期:1998-10-21
  • 最后修改日期:1998-12-25
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  • 在线发布日期: 2013-02-25
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