Details

Autor(en) / Beteiligte

• Zhang Huimin
• Xu Minggang
• Lü Jialong

Titel

Potassium fixation and affecting factors of three typical soils under long-term potassium fertilization in China

Ist Teil von

• Chung-kuo nung yeh kʿo hsüeh, 2007-04, Vol.40 (4)

Erscheinungsjahr

2007

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 探索不同轮作方式和不同气候下，长期施钾对土壤钾素固定的影响。采用室内模拟法和X射线衍射分析技术研究了中国3种典型农田土壤，即灰漠土、潮土和紫色土在长期施钾条件下对外源钾固定能力的变化，并分析了影响土壤钾素固定的主要因素。在外源钾加入浓度0.4～4.0 gand#8226;L-1的范围内，长期施钾与不施钾相比，水云母含量较低的紫色土对外源钾的固定量和固定率显著降低，分别降低了91～559 mgand#8226;kg-1和14％～23％；水云母含量较丰富的潮土固钾量和固钾率略有降低，分别降低了35～274 mgand#8226;kg-1和6％～8％；而水云母含量丰富的灰漠土固钾能力没有发生明显变化。长期施钾对3种土壤SOC、CEC和0.002 mm粘粒含量均无显著影响，而缓效钾和K+饱和度分别增加了11.3～349.9 mgand#8226;kg-1和11％～65％。长期施钾主要是通过影响土壤含钾矿物组成的变化，即水云母向云母-蒙脱石混层层间矿物的转化，而影响土壤钾素的固定，长期施钾延缓或阻止了这种转化，使土壤对外源钾的固定能力降低；土壤缓效钾含量和K+饱和度增加，也使土壤固钾能力降低。 The effect of long-term potassium (K) fertilization on soil K fixation was studied under different cropping systems and climates. Samples taken from NP and NPK treatments in three typical soils (grey desert soil, fluvo-aquic soil and purple soil) were analyzed for revealing K fixation changes and the factors affecting K fixation using laboratory simulating methods and X-ray diffraction. The results showed that when added, K ranging from 0.4 to 4.0 gand#8226;L-1, the K fixation capacity and K fixation rate of purple soi