| 摘要: |
| 以3H2O为示踪剂，用同位素示踪法对非充分灌溉的7大类作物耐旱性进行了试验研究，经63个品种的500余个样品的3H2O测定结果表明：在土壤含水量为凋萎系数以下的极度干旱状况下，作物处于萎蔫失水耐受时间时，给作物灌溉3H2O且复水时间为1.5ｈ，作物吸氘水量随此时间增值大的，其耐旱性强。同时发现，吸3H2O的量─—作物抗萎蔫能力与作物耐旱性成正比。将3H2O法与耐旱性盆栽鉴定法比较结果表明，氘水示踪失水作物抗萎蔫恢复能力是一种判别作物耐旱性的有效方法。 |
| 关键词: 节水灌溉，作物耐旱性，干旱，植物活体水分，放射性示踪 |
| DOI： |
| 分类号:S313 |
| 基金项目:博士点基金、校青年基金资助项目 |
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| Crop Drought Resistance Study under Insufficient Irrigation Conditions with the Method of Tritium Water |
|
Guo Hongfei Xiong Yunzhang Xu Jie
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| Abstract: |
| The drought resistance of more than 500 samples of 63 varieties among 7 types of crop under the insufficient irrigation condition have been studied with the method of isotopic trace technique with 3H2O as tracer.The results show that under the serious dry condition with the soil water content below the wilting coefficIent, and when crop is still in the flaccid hardiness period,the crop whose uptake of tritium water increases areater with the extension of the repeat irrigation time possesses stronger drought resistance when irrigated of 3H2O-flaccid hardiness capacity is positively related with the crop drought resistance.The result of comparing drought resistance determination method of 3H2O with that of potting shows that the capacity restoration of crop flaccid resistance with tritium water is an effective method for the determination of the crop drought resistance. |
| Key words: Water-saving irrigation,crop drought resistance,aridity,water content of living plants,radioactive trace |
