论文部分内容阅读
研究了中南地区3种土壤的电荷量、电荷零点（PZC）和净电荷零点（PZNC）等表面电荷性质及其与土壤矿质组成的关系。结果表明：（1）从赤红壤、红壤到黄棕壤，永久负电荷量（CECp）趋于增大，主要与土壤的粘土矿物组成和粘粒含量有关；可变负电荷量（CECv）变异趋势不明显，主要与土壤氧化铁铝的组成及含量有关；可变负电荷量占负电荷总量的比例趋于降低；正电荷量趋于减小。（2）供试赤红壤、红壤和黄棕壤的PZC分别为3．90、3．35～3．50和2．96～3．12;赤红壤和红壤的PZNC分别为3．85和2．15～2．84，黄棕壤不存在PZNC。（3）初步提出可变电荷土壤表面电荷性质的指标为：PZC＞3．0、PZNC＞2．0、PZC－PZNC＜1．0和CECv／CEC8．2＞0．4。
The charge properties, charge-on-charge (PZC) and net charge-zero (PZNC) surface charge properties of three soils in central-southern China were studied and their relationships with soil mineral composition were studied. The results showed that: (1) CECs tended to increase from red soil, red soil to yellow brown soil, mainly related to clay mineral composition and clay content in soil; CVE variation The trend is not obvious, mainly related to the composition and content of soil aluminum oxide; the ratio of variable negative charge to total negative charge tends to decrease; the positive charge tends to decrease. (2) The PZC of red soil, red soil and yellow brown soil were 3.90, 3.35 ~ 3.50 and 2.96 ~ 3.12, respectively. The PZNC of red soil and red soil were 3.85 and 2 .15 ~ 2.84, yellow brown soil does not exist PZNC. (3) The initial indicators of the surface charge of variable charge soil are: PZC> 3.0, PZNC> 2.0, PZC-PZNC <1.0 and CECv / CEC8.2> 0.4.