Limnological characteristics of lakes in the lowlands of Central Yakutia, Russia
Limnological characteristics of lakes in the lowlands of Central Yakutia, Russia
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俄罗斯中部雅库特低地湖泊的湖泊学特征
DOI：
10.4081/jlimnol.2007.40
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发表时间：
2007
影响因子：
1.6
通讯作者：
H. Hubberten
中科院分区：
文献类型：
--
作者：
T. Kumke;M. Ksenofontova;L. Pestryakova;L. Nazarova;H. Hubberten
分析了东西伯利亚雅库特中部低地(维留伊斯克和雅库茨克)两个地区的47个湖泊的物理化学特征。这项研究的目的是(I)根据湖泊的离子组成和营养物质浓度对湖泊进行分类，(Ii)量化代表测量变量主要变化方向的环境梯度，(Iii)探索所调查的湖泊与其空间位置之间的关系。大多数研究湖泊是浅层的热喀斯特湖泊，略有碱性到碱性。这些湖泊以贫营养为主，在研究区域Vilyuysk有一些中营养和少数富营养例外。在研究区域雅库茨克有四个营养丰富的湖泊，它们受到人为输入的强烈影响，在一种情况下，还受到水鸟输入的影响。数据中的大部分差异由主要离子浓度和相关变量(如电导率)表示。这些变量在两个研究区域的湖泊之间有明显的差异，部分原因是气候引起的负水平衡(即蒸发量超过降雨量)的区域差异。统计分析表明，很大一部分差异可以归因于湖泊流域的植被类型(11%)、经度(7.6%)和湖泊水化学的局部空间差异(2.8%)。假设检验表明，不同植被类型和不同湖泊所在地区，多个变量的均值存在显著差异。然而，数据中的空间自相关假设不得不被拒绝。本文的结果对雅库特地区正在进行的和未来的湖沼学和古环境研究具有重要的意义。探索性分析表明，雅库田湖中部的物理化学特征主要受植被和气候变化的影响，为古环境研究提供了依据。
The physico-chemical characteristics of 47 lakes from two regions in the lowlands of Central Yakutia (Vilyuysk and Yakutsk), Eastern Siberia were analysed. The aims of this study were (i) to classify the lakes according to their ionic compositions and their nutrient concentrations, (ii) to quantify environmental gradients representing the main directions of variation in the measured variables, and (iii) to explore the relationship between the investigated lakes and their spatial positions. Most of the study lakes are shallow, thermokarst lakes that are slightly alkaline to alkaline. The lakes are predominantly oligotrophic, with some mesotrophic and a few eutrophic exceptions in the study region Vilyuysk. There are four hypertrophic lakes in the study region Yakutsk which are strongly affected by anthropogenic inputs and, in one case, additionally by inputs of water birds. Most part of the variance in the data is represented by major ion concentrations and related variables such as electrical conductivity. There were clear differences in these variables between the lakes of both study regions partly due to regional differences in the climate-induced, negative water balance (i.e. evaporation exceeds precipitation). The statistical analysis has shown that a significant part of the variance can be attributed to the type of vegetation in the lake's catchment (11%), to the longitude (7.6%) and to local spatial differences in the lake water chemistry (2.8%). Hypothesis testing indicated that there are significant differences in the mean values of many variables according to vegetation type and to the region where the lakes are located. However, the hypothesis of spatial autocorrelation in the data had to be rejected. The results presented here have important implications for ongoing and future limnological and paleoenvironmental studies in Yakutia. The exploratory analysis has shown that the physico-chemical characteristics of Central Yakutian lakes are mainly influenced by vegetation and climate driven changes that provides the basis for paleoenvironmental studies.