摘要
在东北黑土耕层土壤小于2μm黏粒的化学组成和X衍射分析基础上,对不同纬度的15个黑土的黏粒矿物组成和空间差异进行研究,并探讨了其影响因素及演化机制。结果表明:东北黑土耕层土壤黏粒矿物属伊利石—蒙伊混层矿物类型,但其组合因区域不同有所差异,高纬度黑土为伊利石—蒙伊混层型,低纬度黑土则为蒙伊混层—伊利石—蛭石型。影响黏粒矿物空间差异的主要因素有降水、温度、作物类型。由于这些因素在空间上的显著差异,使黑土黏粒矿物演化序列处于伊利石向蒙伊混层或蛭石的不同阶段,导致东北黑土黏粒矿物组成在纬度上形成显著区域差异。
Based on the knowledge of chemical composition and X ray analysis of 〈 2 μm clays in agric horizon of the black soil in Northeast China, clay mineral composition and its spatial variation of 15 black soil samples collected from different latitudes was studied, and its affecting factors and evolution mechanisms explored. Results reveal that the clay minerals in agric horizon of the black soils in Northeast China are of the type of illite-Smectite/Illite mixed layer mineral, hut their composition varies from region to region. At high-latitude they are of the type of illite-Smeetite/Illite mixed layer mineral, and at low latitude of the type of S/I mixture-illite-vermieulite. Factors causing spatial variation of their composi- tion are mainly precipitation, temperature, and type of crops. As they vary sharply from region to region, clay minerals in the black soil of Northeast China evolve from illite toward S/I mixture or vermiculite, resulting in significant regional variation of clay mineral composition with latitude.
出处
《土壤学报》
CAS
CSCD
北大核心
2010年第4期734-746,共13页
Acta Pedologica Sinica
基金
国家沃土工程(2006BAD25B05)项目资助
关键词
黑土
黏粒矿物
空间差异
演化机制
Black soils
Clay minerals
Spatial variation
Evolution mechanism
