摘要
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 explore the feasibility of ion exchange resin membrane （IERM） as a nutrients-extracting tool in the study of ammonium and potassium ions interaction in soil and the relation to canola nutri- ents uptake, the IERM incubation and pot experiments were conducted on the soils with such exactly simi- lar conditions, as moisture, temperature, et al. The results showed that the amount of ammonium extracted by IERM was reduced by the co-existing of potassium, but that of K＋ extracted was not influenced by am- monium coapplication, which was concerned with the preferential fixation of ammonium in soil when coapplied with potassium. The significant correlation was detected between the nutrients amount extracted by IERM with plant nutrients uptake and dry matter weight, which demonstrated the feasibility of IERM as a roots simulator in the study of nutrients interaction in soil. However, IERM was not plant roots, resulting in some inconsistency in the change of nutrients extracted by IERM or by canola, which was seldom men- tioned in the previous studies. The existence of such inconsistency implied that more efforts should be taken on the study of IERM application conditions, in order to make the best use of IERM in the study of the influence on plant nutrients uptake by ammonium and potassium interaction in soil.
出处
《中国农学通报》
CSCD
2007年第9期344-349,共6页
Chinese Agricultural Science Bulletin
基金
国家重点基础研究发展计划"肥料减施增效与农田可持续利用基础研究"(2007CB109301)
国家自然科学基金项目"土壤钾素变化的定量测定方法与有效钾库容量研究"(NSFC40201027)
国际植物营养研究所(IPNI)合作项目"不同施肥模式的生态环境效应"(Nan jing-10)联合资助
关键词
铵
钾
土壤
离子交换树脂膜
油菜
Ammonium, Potassium, Soil, Ion exchange resin membrane （IERM）, Canola
