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为探明离子交换树脂膜作为养分提取手段在土壤铵钾交互作用研究上的应用效果,设置了相同培养条件下的树脂膜埋置实验和油菜盆栽试验。结果表明,施钾能减少铵的膜提取量,而施铵对钾的膜提取量影响不显著,这与铵钾同时施用时铵优先固定有关。膜提取养分量与植株养分吸收量及干物重之间均达显著或极显著相关,加上树脂膜使用便捷且可以原位提取养分,因而树脂膜可以被当作“根系模拟器”进行养分原位提取和养分交互作用方面的研究。但由于膜与真正的植物根系毕竟不同,故研究中也发现了一些膜提取养分量与植株养分吸收量并不完全一致的情况,这一点在前人的研究中甚少提及,这些情况的发现说明今后的研究中对树脂膜的应用条件还应多加注意,以便对树脂膜更好地利用,达到仅通过树脂膜这种便捷手段不需要通过植物试验就能了解土壤中养分交互作用可能对养分植物有效性的影响的目的。
In order to find out the application effect of ion exchange resin membrane as nutrient extraction method in the research of ammonium-potassium interaction in soil, a membrane embedding experiment and rape pot experiment were set up under the same culture conditions. The results showed that application of potassium could reduce the amount of ammonium extract, while application of ammonium had no significant effect on the amount of potassium extracted, which was related to the preference of ammonium for simultaneous application of ammonium and potassium. There was a significant or very significant correlation between the amount of nutrient extracted from the plant and the uptake of plant nutrients and the dry weight of the plant. In addition, the resin membrane could be used as a “root simulator” Study on nutrient in situ extraction and nutrient interaction. However, since the membrane and the true plant root are different after all, the research also found that some nutrients extracted by the membrane are not completely consistent with the plant nutrient uptake, which is seldom mentioned in previous studies It was found that the application conditions of the resin film in future research should pay more attention to make better use of the resin film to achieve the only way through the resin film to understand the nutrient interaction in the soil without the need of plant experiments The purpose of nutrient plant effectiveness is to influence.