摘要
选取我国东北、西南、西北及中北部地区的10个典型湖泊,调查了表层沉积物生物硅含量变化情况,并通过区域对比分析了生物硅含量变化的原因,寻找我国湖泊生物硅变化的空间规律。结果表明,西北及中北部地区湖泊生物硅含量平均值整体低于东北和西南地区湖泊,可能是由于西北及中北部地区较低的温度和较少的降水量导致硅藻生长受限,从而造成生物硅含量偏低。东北湖泊与西南湖泊生物硅含量相对较高,但其形成原因不同。东北2个湖泊均靠近人类聚居区,属富营养型湖泊,虽然东北地区年均温较低,但充足的营养盐为硅藻生长提供了必要因素。而西南地区湖泊大多为中贫营养型湖泊,其生物硅含量整体较高可能主要归因于较高的温度和较多的降水。
Changes of biogenic silica （BSi） contents of lake surface sediments in ten lakes from northeastern, southwestern, northwestern and north-central China were investigated in this study. The causes for the changes of BSi content and its spatial distribution characteristics were also studied via regional comparison among the ten lakes. The results showed that the mean contents of BSi in northwestern and north-central China were lower than that in northeastern and southwestern China, possibly because lower temperature and less precipitation restricted the growth of algae, leading to less biomass production. However, the reasons for the higher mean values of BSi in the lakes from northeastern and southwestern China were different. The two lakes in northeastern Chi- na were eutrophic lakes and next to human settlements, so they may be substantially influenced by human activities. Although annual mean temperature in northeastern China was markedly low- er, there were adequate nutrients for algae growing. Most lakes in southwestern China were oligo- trophic lakes, thus the higher BSi values may be induced by the higher temperature and more precipitation.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第12期3480-3484,共5页
Chinese Journal of Ecology
基金
黄土与第四纪国家重点实验室开放基金项目(SKLLQG1410)
国家自然科学基金项目(41173122
41405093)资助
关键词
湖泊
表层沉积物
生物硅
空间分布
lake
surface sediment
biogenic silica
spatial distribution
