摘要
位于台湾省南部的大鬼湖，由于湖底常缺氧等特殊自然条件，使湖底沉积物免遭干扰，而能完整地记录过去气候的环境的变动．其岩芯中出现的白层，有明显较低的有机质含量和C／P、N／P、S／P及Si／Al比值．与较高的Si／P、Fe／C、Mn／C、Fe／Mn和Mg／Al比值，显示当时气候可能较干冷，集水区植生较差、湖水位较低，而且环境较氧化．相比之下，富含有机质的黑色沉积物，则反映气候较暖湿、湖水面至少升高2m，而且集水区土壤和水体较还原。
The sediments deposited in the anoxic Great Ghost Lake in southern Taiwan, China were undisturbed due to the lake's unique hydrological and geographic conditions. As a result,past climatic and environmental records were well preserved. The distinctive white laminations appeared in the generally black sediments are characteristic of lower organic-matter content, and lower C/P, N/P, S/P and Si/Al ratios, but higher Si/P, Fe/C, Mn/C, Fe/Mn and Mg/Al ratios.These indicate times of cooler/driver climate, poorer plant growth around the drainage area, lower water-level and more oxidized conditions in the soil and in the water column. On the other hand, the organic-matter-rich black sediments were deposited in a warmer/wetter climate under a more reduced condition. In addition, the variations in the Mg/Al rations seem to reflect at least 12% changes in salinity or water volume, or 2m changes in the water level.
出处
《湖泊科学》
EI
CAS
CSCD
1998年第3期13-18,共6页
Journal of Lake Sciences
基金
NSC87-2611-M-110-006-GP资助
关键词
古气候
湖积物
大鬼湖
沉积物
古环境
元素分布
Paleoclimate,lake sediment, Great Ghost Lake, ratio of the elements
