Properties of soils in Grove Mountains,East Antarctica  

作　　者：李潇丽 刘小汉 琚宜太 黄费新 

机构地区：[1]Institute of Geology and Geophysics,Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》2003年第7期683-693,共11页中国科学（地球科学英文版）

基　　金：This work was supported by the Chinese Academy of Sciences(Grant No.KZCX2-303);he State Key Project during the 9th Pive Year Plan Period(Grant No.98-927-01-06).

摘　　要：Three cold desert soil sites were first found in the southern Mount Harding, Grove Mountains, East Antarctica. The soils are characteristics of the widespread occurrence of surface desert pavement, abundant water-soluble salts, strongly stained upper portion of soil profile, slightly acid and negligible organic matter content. A 1:5 soil-water extracts analysis indicates that the dominant cations are Mg2+ and Na+, followed by Ca2+ and K+, and the main anion is SO 4 2? , then Cl? and NO 3 2? . The accumulation of water-soluble salts indicates ion transportation in the frigid and arid Antarctica environment. The distribution of the salts is related to the maximum content of moisture and clay mineral. Clay fraction migration occurs in the soils, which is different from that of other cold desert soils. The upper horizons of some profiles are generally stained, namely rubification, primarily because of the weathering of iron-bearing minerals. The reddish hues of cold desert soils have been attributed to relatively high concentrations of dithionite-extractable Fe (Fed). The weathering features of soils suggest that the soil age of this area is 0.5–3.5 Ma. No remnants of glaciations were found on the soil sites of Mount Harding, which suggests that the Antarctic glaciations have not reached the soil sites since at least 0.5 Ma, even during the Last Glacial Maximum.Three cold desert soil sites were first found in the southern Mount Harding,Grove Mountains, East Antarctica.The soils are characteristics of the widespread occurrence of surface desert pavement,abundant water-soluble salts, strongly stained upper portion of soil profile, slightly acid and negligible organic matter content. A 1:5 soil water extracts analysis indicates that the dominant cations are Mg2+ and Na+, followed by Ca2+ and K+, and the main anion is SO2-4 , then Cl- and NO3-. The accumulation of water-soluble salts indicates ion transportation in the frigid and arid Antarctica environment. The distribution of the salts is related to the maximum content of moisture and clay mineral. Clay fraction migration occurs in the soils, which is different from that of other cold desert soils. The upper horizons of some profiles are generally stained, namely rubification, primarily because of the weathering of iron-bearing minerals. The reddish hues of cold desert soils have been attributed to relatively high concentrations of dithionite-extractable Fe (Fed).The weathering features of soils suggest that the soil age of this area is 0.5-3.5 Ma.No remnants of glaciations were found on the soil sites of Mount Harding,which suggests that the Antarctic glaciations have not reached the soil sites since at least 0.5 Ma,even during the Last Glacial Maximum.

关 键 词：the Grove Mountains  cold DESERT soil  DESERT pavement  SOLUBLE salt  Fed. 

分 类 号：X144[环境科学与工程—环境科学]