极地研究Issue(3)：237-245,9.DOI:10.13679/j.jdyj.2015.3.237
北极新奥尔松地区土壤中生物硅含量及形态特征
BIOGENIC SILICA CONTENT AND MORPHOLOGY OF SOIL AT NY-ÅLESUND, THE ARCTIC
摘要
Abstract
The global silicon cycle is closely related to the carbon cycle.Biogenic silica ( BSi) is an important carrier in the silicon cycle.There have been many studies on the silicon cycle of terrestrial ecosystems, but few on the silicon cycle in poplar regions.BSi content and phytolith morphology were analyzed in soil and plant samples obtained near the Chinese Yellow River Station in Ny-Ålesund, Svalbard, during the fifth Chinese Arctic Scientific Expedition.In the topsoil of Svalbard, the content of particulate organic carbon ( POC) and particulate organic nitrogen ( PON) ranged from 1.00 to 69.3 mg· g-1 and 0.11 to 9.84 mg· g-1 , with an average of 13.7 mg· g -1 and 1.43 mg· g-1 , respectively.The concentration of soluble silica in the soil of this study area ranged from 3.90 to 26.3 μg· g-1 , with an average of 10.7 μg· g -1 , and the BSi ranged from 5.60 to 9.97 mg· g-1 , with an average of 7.56 mg· g -1 .There was a positive correlation between BSi and both PON and POC in soil, indicating that their sources were similar.The BSi content in the topsoil of the Arctic is higher than that in temperate and tropical regions.Phytoliths in the plant samples showed various forms including cap-shaped, round, smooth rods, tooth-shaped, spiny bars and dumbbell-shaped, with sizes between 10 and 100μm.Phytoliths and diatoms were found in soil samples as compositions of BSi.Phytoliths were the dominant BSi in soil with vegetation cover while pennate di-atoms were dominant in bare soils, where they accounted for about 93.3% of the BSi.Phytoliths in soil samples were mainly from plants, inferred from similarity of the morphology to that of phytoliths in plants.The contents of POC, PON, soluble silica, BSi, and the abundance of phytoliths were higher in samples from soil with vegetation covered than in samples of bare soil, suggesting that the silicon cycle in the soil of the Arctic is strongly influenced by plants.关键词
北极/生物硅/植硅体/硅藻Key words
Arctic area/biogenic silica/phytolith/diatom引用本文复制引用
刘森,冉祥滨,臧家业,王能飞..北极新奥尔松地区土壤中生物硅含量及形态特征[J].极地研究,2015,(3):237-245,9.基金项目
国家自然科学基金（41106072）、国家海洋局“南北极环境综合考察与评估”专项-站基生物生态环境本底考察（ CHIN-ARE2013-02-01）和中央级公益性科研院所基本科研业务费专项（GY02-2012G29）资助 （）
