Environmental changes in the southeastern Pampa plain (southeastern South America) during the last millennium based on multiple lacustrine indicators and historical records

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES
Guillermina Sánchez Vuichard, Luciana Mengo, Silvana Halac, Gabriela Foray, Gabriela Hassan, Carolina Vásquez, Silvina Stutz
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引用次数: 0

Abstract

Paleoenvironmental analyses have been widely used to infer the fluctuations in past environmental conditions of lakes and reservoirs due to either anthropogenic and/or climatic influences. The Siete Lomas shallow lake (37° 08′ S, 57° 38′ W) is located in an area with a long history of anthropogenic impacts in the Pampa plain, southeastern Argentina. Our aim was to reconstruct the paleoenvironmental history of the Siete Lomas shallow lake and to identify the main forcings of change during the last 1000 years. A multi-proxy analysis was performed including pollen and non-pollen palynomorphs, diatoms, fossil pigments, plant macrofossils and the associated fauna, Total Phosphorus (TP) and organic matter. Two main environmental stages (the latter including two substages) throughout the history of the Siete Lomas lake were recognized as a result of the action of natural variability and anthropogenic drivers. Stage I (1100–1880/1900 AD) recorded a pre-agricultural period when human impacts were negligible, and was considered as reference conditions. In this stage, a temporary, brackish and oligotrophic lake was inferred. Stage II was composed by two substages. Substage II-1 (1900–1945 AD) suggested the establishment of a permanent freshwater lake with higher pelagic primary production and an incipient eutrophication process, associated to increased anthropogenic activity and higher precipitation. Nutrient load and eutrophication processes controlled Substage II-2 (1945–2021), as a productive lake subject to increased eutrophication as a consequence of nutrient loadings from the surrounding catchment was identified. In particular, a highly productive, turbid-hypereutrophic and permanent lake related to the increase in agricultural activities was recognized for the period 2005–2021 AD. Overall, during the early period of the lake history, changes in dominant communities were mainly controlled by climate whereas after 1900 AD anthropogenic and natural forcing synergistically promoted the generalized degradation of the water quality of the Siete Lomas shallow lake.

Abstract Image

基于多种湖沼指标和历史记录的潘帕平原东南部(南美洲东南部)上千年的环境变化
古环境分析被广泛用于推断湖泊和水库过去因人为和/或气候影响而造成的环境条件波动。Siete Lomas浅水湖(南纬37°08′,西经57°38′)位于阿根廷东南部潘帕平原,该地区长期受到人类活动的影响。我们的目的是重建 Siete Lomas 浅湖的古环境历史,并确定过去 1000 年间变化的主要影响因素。我们进行了多代理分析,包括花粉和非花粉古形态、硅藻、化石色素、植物大化石和相关动物群、总磷(TP)和有机物。在自然变异和人为因素的作用下,Siete Lomas 湖历史上出现了两个主要环境阶段(后者包括两个次阶段)。第一阶段(公元 1100-1880/1900 年)记录了人类影响可以忽略不计的前农业时期,被视为参考条件。在这一阶段,推断出湖泊为临时性、咸水湖和寡营养湖。第二阶段由两个子阶段组成。子阶段 II-1(公元 1900 年至 1945 年)表明,由于人类活动的增加和降水量的增加,形成了一个浮游初级生产量较高的永久性淡水湖,富营养化过程刚刚开始。养分负荷和富营养化过程控制着第 II-2 子阶段(1945-2021 年),由于周边集水区的养分负荷增加,一个富饶的湖泊富营养化加剧。特别是在公元 2005-2021 年期间,由于农业活动的增加,湖泊被认为是一个高产、浑浊-富营养化的永久性湖泊。总体而言,在湖泊历史的早期阶段,优势群落的变化主要受气候控制,而在公元 1900 年之后,人为和自然因素协同促进了 Siete Lomas 浅湖水质的普遍退化。
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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
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