| 摘要: |
| 采用幼苗密集种植、尼龙网分隔根-土界面的方法研究小麦根际微区土壤交换性钾与缓效钾的动态变化。结果表明,小麦根际微区内,仅在根表的1 mm 范围内交换性钾呈现相对富集,其他部分的交换性钾呈亏缺状况,其亏缺率与亏缺范围因土壤质地和施钾量的不同而有改变。砂土钾的迁移速率大于轻壤土。前者的亏缺区也大于后者,增施钾肥后根际交换钾的亏缺率增大,加速了钾向根表的迁移和供应。此外,小麦根际微区的缓效钾也呈现亏缺状况。 |
| 关键词: 小麦根际 土体 亏缺 富集 交换钾 缓效钾 |
| DOI： |
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| THE DISTRIBUTION OF POTASSIUM IN RHIZOSPHERE OF WHEAT |
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| Abstract: |
| The distribution of exchangeable-K and slowly available-K in rhi- zosphere of wheat were studied by box-cultured experiment with thick planting seedling,and nylon sieve net was used to screen interface of too system and soil. The result shown that the depletion of exchangeable-K was found in almost all the rhizosphere except the distance of 1mm from root surface where the re- lative accumulation of exchangeable-K occured.The Percentage and distance of exchangeable-K depletion depended on the grades of soil ... |
| Key words: rhizosphere of wheat bulk-soil depletion accumulation exchangeable-K slowly available-K |
