摘要
研究了16年定位施肥条件下,不同施肥方式对蔬菜保护地土壤中有效钾含量与土壤供钾特性的影响。结果表明:土壤全钾含量保持在较高水平22.43～26.92g.kg-1;与不施有机肥处理相比,长期施用有机肥后土壤全钾含量有所下降(单施磷肥处理除外),但不同的化肥单施或配施对土壤全钾含量影响不大;长期单施或化学肥料配施土壤的供钾强度和钾素有效率都不高,但施用有机肥明显提高了土壤有效钾含量及土壤的供钾能力,其中,长期单施化学钾肥土壤中有效钾含量为195.60mg.kg-1,单施有机肥处理为460.14mg.kg-1,而化学钾肥与有机肥配施后增长为621.06mg.kg-1;土壤供钾强度和钾素有效率在施用有机肥后也大幅度提高。
Based on 16 years localized fertilization experiment, the effects of different fertilization on soil available potassium （K） and soil K supply in a sheltered vegetable field were studied. The results showed that the soil total K in the sheltered vegetable field maintained a higher level of 22. 43-26.92 g · kg^-1. Long-term application of organic plus chemical fertilizers induced a lower content of soil total K, comparing with applying chemical fertilizers alone, while different chemical fertilizers had little effects on soil total K. The intensity of soil K supply and the effectiveness of soil K were both low when chemical fertilizers were applied alone or in combinations, while the content of soil available K increased obviously with the application of organic fertilizers. The contents of soil available K were 195.60,460. 14 and 621, 06 mg · kg^-1 when chemical po- tassium, organic fertilizer, and chemical potassium plus organic fertilizer were applied respectively. The intensity of soil K supply and the effectiveness of soil K were both increased with organic fertilization.
出处
《生态学杂志》
CAS
CSCD
北大核心
2007年第9期1339-1343,共5页
Chinese Journal of Ecology
基金
国家自然科学基金项目(30370972
30571266)
辽宁省自然科学基金资助项目(20032078)
关键词
定位施肥
保护地
土壤供钾
钾素有效率
localized ferti!ization
sheltered vegetable field
soil potassium supply
effectiveness of soil potassium.
