摘要
开展稻油轮作茬口土壤不同形态钾素动态变化研究,揭示茬口土壤的真实供钾能力,为钾肥的合理施用提供理论依据。本文采用培养试验和田间试验相结合的方法,在水稻收获后连续不定期取土壤样品,测定不同形态钾素含量。结果表明:培养试验中沙洋和武汉土壤醋酸铵-钾含量表现出上升的趋势,土壤沸硝酸-钾、冷硝酸-钾和四苯硼钠-钾含量变化不明显,表明水稻收获后土壤非交换性钾向交换性钾转化,但有效钾总量保持不变。田间试验条件下,沙洋和武汉土壤醋酸铵-钾含量显著增加,其他形态的钾素含量有增加的趋势,这可能与秸秆钾的释放等环境因素有关。两种试验条件下,武穴土壤不同形态的钾含量变化均不显著,说明茬口土壤有效钾含量的变化因土壤性质而异。可见,水稻-油菜茬口土壤有效钾含量在水稻收获后有升高的趋势,其增幅受土壤类型和秸秆还田量等环境因素的影响。
The dynamics of different forms of potassium （K） in soils were studied to explore the K supplying capacity and provide the theoretical basis for the reasonable application of K fertilizer. In this experiment, culture experiment and field experiment were carried out to measure different forms of soil K after rice harvest. The results showed that the soil available K extracted with ammonium acetate showed an increase trend in Shayang and Wuhan. The potassium extracted with boiling nitric acid, cold nitric acid extracting and NaBPh4-EDTA has not changed significantly under culture experiment, indicating that the soil non-exchangeable K was converted to exchangeable K after harvest, but the total amount of available K was unchanged. Under field experiment, the soil K extracted with ammonium acetate in Shayang and Wuhan increased significantly, and other forms of K showed increasing trends. This may be related to environmental factors such as the release of straw K. While the changes of different forms of soil K in Wuxue were not significant under two experimental conditions, which indicated that the change of available K in the soils was different due to soil properties. The available K under paddy rice-oilseed rape rotation increased after rice harvest, which was associated with environmental factors such as soil types and straw returning rate.
作者
朱丹丹
廖世鹏
丛日环
李小坤
ZHU Dan-dan, LIAO Shi-peng, CONG Ri-huan, LI Xiao-kun,(College of Resources and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation （Middle and Lower Reaches of Yangtze River）, Ministry of Agriculture, Wuhan 430070, China)
出处
《土壤通报》
CAS
北大核心
2018年第5期1137-1143,共7页
Chinese Journal of Soil Science
基金
国家自然科学基金资助项目(41571284)资助
关键词
水稻油菜轮作
土壤钾素形态
供钾能力
测土推荐施肥
Paddy rice-oilseed rape rotation
Soil potassium forms
Potassium supplying capacity
Soil testing andfertilizer recommendation
