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对辽东山地典型冰缘地貌上覆土壤的粒度、常微量化学元素进行测试分析,结果表明:土壤颗粒组成包括黏粒20.79%、粉粒69.54%和砂粒9.67%,平均粒径整体偏细,约为6.45Ф,不同土壤类型、地貌类型及坡向的粒度分布存在一定差异。土壤元素化学组成以SiO2(45.60%),Al2O3(12.90%),Fe2O3(3.90%),K2O(2.17%)为主,最大比例可达73.36%。元素Ca,Na,P,Sr显著淋溶,而Mn,Ti,Cu,Zn则相对富集,其他元素迁移不甚明显。少数元素还表现出与粒度分布存在显著关联,其中K,Na,Sr,Ba多存在于砂质土壤中,而元素Ti则容易在粒度更细致的黏土颗粒中留存。化学风化指数CIA均值约为65.50,Rb/Sr约为0.70,反映风化程度较低,且长期经历干冷气候,A—CN—K三角模型表明,研究区土壤风化以脱钙钠、富铝为主,风化水平尚处于低等风化阶段中后期。
The results show that the soil particle composition includes 20.79% of clay, 69.54% of silt and 9.67% of sand, the average particle size is overall thin and about For 6.45Ф, there are some differences in the grain size distribution of different soil types, topography and aspect. The chemical composition of the soil elements is mainly composed of SiO2 (45.60%), Al2O3 (12.90%), Fe2O3 (3.90%) and K2O (2.17%), with the maximum proportion up to 73.36%. The elements Ca, Na, P and Sr were significantly leached, while Mn, Ti, Cu and Zn were relatively enriched while the other elements did not migrate obviously. Minority elements also showed significant correlation with particle size distribution. Among them, K, Na, Sr and Ba were mostly found in sandy soil, while elemental Ti was easily retained in clay particles with more granularity. The chemical weathering index (CIA) was about 65.50 and the Rb / Sr was about 0.70, reflecting the low degree of weathering and the long-term dry and cold climate. The A-CN-K triangle model showed that the soil weathering in the study area was dominated by decalcified sodium and aluminum-rich , The weathering level is still in the late weathered stage.