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茶园土壤钾素容量/强度关系及施用钾镁肥的影响 被引量:11

Potassium Quantity Intensity Relationship(Q/I)in Tea Soils and the Influence of Potassium and Magnesium Application on It
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摘要 对我国主要茶区茶园土壤分析结果表明,土壤钾素含量大都处于中等水平以下,且呈地带性分布,即缓效钾的含量由北而南下降,速效钾占缓效钾的比例由北而南增加。对土壤钾素容量/强度(Q/I)分析表明,茶园土壤钾素的ARke(强度指标)通常都小于0.01(mol/l)-12。施用钾肥能显著提高供钾强度指标ARke和ΔK0(容量指标)。施镁能增加ARke,但对ΔK0和PBCk(缓冲能力)无明显影响。 The Potassium Quantity Intensity relationship(Q/I)in tea soils of China and the influence of K and Mg application on it were investigated.The K availability status were rather low with the available and slowly available K in 16 samples out of the total 18 tested ranging from the medium to the very low levels.The contents of slowly available K decreased,but the percentage of available K content in the slowly available K increased from the northern to the southern tea geowing areas,showing an obvious zoned characteristic in distribution.A majority of soil samples had the equilibrium potassium activity ratios AR k e below 0 01(mol/l) -1/2 ,indicating that the K + was primarily held at edge positions.With K addition,the AR k e value increased from below0 01 to above 0 01,suggesting an increased K + intensity.The △ K 0 became more negative with K addition,showing a greater K + release into soil solution,resulting in a greater labile K pool.Applying Mg increased AR k e value markedly but indefinitely influenced the △ K 0 and PBC k values.The △ K 0 and AR k e values in the control treatment without K and Mg applications tended to decrease.
出处 《茶叶科学》 CAS CSCD 1996年第2期93-98,共6页 Journal of Tea Science
基金 国际钾肥研究所(IPI)资助
关键词 茶园 土壤 施肥 Potassium,Quantity,Intensity,Q/I,Magnesium,Tea soils
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二级参考文献7

  • 1团体著者,土壤农业化学常规分析方法,1983年
  • 2蒋梅菌,土壤学报,1979年,16卷,4期
  • 3郑圣先,中国农业科学,1989年,22卷,1期
  • 4郑圣先,湖南农业科学,1988年,2期
  • 5罗家贤,土壤学报,1988年,25卷,4期
  • 6罗成秀,湖南省土壤钾和钾肥,1988年
  • 7赵其国等.江西红壤[M]江西科学技术出版社,1988.

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