摘要
通过电位滴定曲线探讨了长白山和五大连池火山灰土壤剖面的电荷零点(ZPC)特性.结果表明,两火山灰土壤既有一定量的可变电荷,又有一定量的永久电荷,其土壤胶体是可变电荷胶体和永久电荷胶体的混合体系.两土壤剖面各层ZPC:均位于滴定曲线的酸方一侧,并有随深度增加而增大的趋势,但ZPC的位移(σi)则有随剖面深度的增加而减小的趋势两剖面表层土壤ZPC均较国外的火山灰土壤低,显著高于中国西北地区的黄土质土壤和东北地区的黑土.ZPC和σi值的变化,既受亚洲大陆起源的广域风尘堆积的影响,又与土壤有机质积累有关,二者的综合作用是两地火山灰土壤ZPC降低和σi值增大的主要原因.
The characteristics of the zero point of charge (ZPC) of volcanic ash soil profiles in Changbaishan and Wu-dalianchi was studied and discussed by means of potentiometric titration curves. The results showed that the two volcanic ash soils had not only a little variable charg, but also a little permanent charge. The clay fractions of the volcanic ash soils carried both variable and permanent charges. The ZPC of eeach layer in both soil profiles all lied in the acid side of titration curve, and increased with increasing soil depth. However, the ZPC displacements (σi) decreased with increasing soil depth. The ZPC of surface layer in both soil profiles was lower than that of the volcanic ash soils in foreign countries, but obviously higher than that of Loess soil in the Northwest and of black soil in the Northeast China. The variation of ZPC and Si was affected not only by the deposition of long-rang tropospheric eolian dust from the Asian continent, but also by the accumulation of soil organic matter. Their combined effect was the main reason to the decrease of ZPC and σi the increase of σi in Changbaishan and Wudalianchi volcanic ash soils.
出处
《应用生态学报》
CAS
CSCD
2003年第10期1677-1680,共4页
Chinese Journal of Applied Ecology
基金
吉林农业大学与日本岩手大学合作研究项目(JNGJ99-02)
关键词
长白山
五大连池
火山灰土壤
电荷零点
广域风尘
Changhaishan, Wudalianchi, Volcanic ash soil, Zero point of charge, Long-rang tropospheric eolian dust.
