我国南方一些土壤的钾素Q/I特性  

Q/I CHARACTERISTICS OF POTASSIUM IN SOILS IN SOUTH CHINA

作　　者：朱永官[1] 罗家贤[1] 

机构地区：[1]中国科学院南京土壤研究所,南京210008

出　　处：《热带亚热带土壤科学》1993年第2期75-80,共6页

摘　　要：钾素Q/I特性是表征土壤钾素状况的一个重要指标,它能同时度量土壤钾素的强度和容量。本文研究了我国南方一些土壤的钾素Q/I特性、结果表明:(1)不同土壤具有不同的Q/I曲线,它们表征不同的土壤钾素有效性和钾素状况;(2)土壤钾位缓冲容量(PBC^K)与阳离子交换量呈极显著正相关(r=0.9288),石灰土和紫色土的PBC^K值高于砖红壤、赤红壤和红壤,而ARe^K值则相反;(3)—△K°与土壤交换性钾呈极显著正相关(r=0.7870),但是具有一定含量的2:1型粘粒矿物的石灰土和紫色土,其—△K°明显低于交换性钾量,因此,lmol L^(-1)中性NH_4OAc可能会过高地估计土壤的交换性钾。Q/I Characteristics of potassium are important indices to indicate soil potassium status, and can measure both the intensity and quantity of soil K at the same time. This paper dealt mainly with Q/I characteristics of potassium in some soils in south China, showing that: 1)different soil had different Q/I curves, and they represented different K availability and K status; 2) soil K potential of buffering capacity (PBC^K) significantly correlated with CEC (r=0.9288), PBC^K of limestone soil and purple soil were higher than that of tatosols, latored soils and red soils, and vice versa for ARe^K; 3)—△K° significantly correlated with soil ex(?)ble K, but that of limestone soil and p urple soil with 2∶1 type clay mineral were higher than exchangeable K, therefore 1 tool L^(-1) NH_4OAc might overestimate soil exchangeable K 1ecel.

关 键 词：土壤 钾 

分 类 号：S158.3[农业科学—土壤学]