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测定了福建省黑云母花岗岩,凝灰岩、玄武岩和石英闪长岩母质发育的3种水型红壤性水稻土及起源土壤的钾素 Q/I 曲线,获得钾位缓冲容量 PBC~K,速效钾含量-△K,钾离子平衡活度比 AR_c~k 和钾位 pK-1/2 P(Ca+Mg)等热力学参数.结果表明:(2)不同水型水稻土PBC~K,潴育型>潜育型>渗育型>超源土壤.主要受水稻土形成发育过程中土壤胶体表面性质的综合影响.(2)不同母质红壤性水稻土 PBC~K,渗育型系列玄武岩者>黑云母花岗岩者>凝灰岩者>石英闪长岩者,潴育型系列玄武岩者>凝灰岩者>石英闪长者者>黑云母花岗岩者,主要受到腐殖质、粘粒和游离氧化铁含量的影响.(3)黑云母花岗岩母质水稻土的现实速效钾最大,玄武岩母质者最小;但在 AR_c~k 一致的条件下则机反.(4)钾位和 AR_c~k 的分析与上述结果一致.
The potassium Q / I curves of three types of red paddy soil and source soil with biotite granite, tuff, basalt and quartz diorite in Fujian Province were determined. Potassium buffer capacity PBC K, available potassium content - △ K, potassium ion balance activity ratio AR_c ~ k and potassium position pK-1/2 P (Ca + Mg). The results showed that: (2) PBC- (2) PBC-K, infiltration basalts> biotite in paddy soils of different parental types, Granite> tuff> quartz diorite, retention type basalt> tuffite> quartz diorite> biotite granite, which are mainly affected by humus, clay and free iron oxide content. (3) Biotite granite parental paddy soil has the highest available available potassium and the lowest basaltic parent material, but it is reverse when AR_c ~ k is consistent. (4) The analysis of potassium position and AR_c ~ k is consistent with the above results.