摘要
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.
It has been studied that Q/I curves K or paddy soils that are three moisture types derived from red earth derived from biotite granite,tuff,basalt,and quartz diorite.The potassium potential capacity(PBC^K),rapdly available potassium(-ΔK°), cation balanced activity ratio(AR_e^K)and potassium potential (pK-P(Ca+Mg)/2)have been obtaincd.The major results of this study are as follow:(1)PBC^K of the paddy soils that are not same moisture types are periodicailly waterlogged paddy soils≥gleyed paddy soils>percogenic paddy soils>red earth.PBC^K was been synthetially affected by the surface properties of soil colloids in paddy soils formative process.(2)PBC^K of the paddy soils not derived from same parent material are basalt>biotite grnite>tuff>quartz diorite in the percogenic system and basalt≥tuff>quartz diorite>biotite granite in the periodically water- logged system,affected chicflly by the content of organic matter,clay and free iron oxide.(3)The rapidly available potassium in the paddy soils derived from biotite granite are maximal and that from basalt are minimal,but it's opposite in same AR_e^K.(4)The analysis for pK-p(ca+Mg)/2 and AR_e^K are same with the above mentioned results.
关键词
水稻土
红壤
钾素
Q/I参数
potassium
cation balanced activity ratio
potassium potential
