Pollen assemblages and their environmental correlates during the past 200 years inferred from sediments records in a shallow lake

Guo, Tong; Yang, Zhifeng; Chen, H.

doi:10.1016/j.proenv.2012.01.034

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…In aquatic ecosystems, Myriophyllum pollen can be used to infer water-level fluctuations in shallow lakes (Shulmeister and Lees, 1995; Prebble et al, 2005). CCA (Canonical Correspondence Analysis) analysis of pollen from cores in Baiyangdian Lake showed that water level was more closely related to Myriophyllum , with increases in Myriophyllum pollen content indicating deeper lake water (Guo et al, 2012). The general trends of Pediastrum and Myriophyllum in the GGNE-2 core were consistent with Artemisia and opposite of Chenopodiaceae, therefore we suggest that Pediastrum and Myriophyllum can be simple indicators of changes in lake water level here.…”

Section: Discussionmentioning

confidence: 99%

Changes in the lake-grassland ecosystem revealed by multiple proxies in a sediment core from Ganggeng Nur Lake, northern China

Zhang²,

et al. 2023

Quat. res.

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As the main global terrestrial ecosystem component, grasslands are extremely sensitive to global climate change. With increasing human activities over the last century, grassland ecosystems have been degraded to different degrees. However, the evolution of lake-grassland ecosystems in recent centuries remains unclear due to the dearth of high-resolution records. Here, we present high-resolution lacustrine sediment grain size, pollen (Artemisia, Myriophyllum), Pediastrum, and n-alkane records from Ganggeng Nur Lake to investigate vegetation, lake evolution, and human effects in semiarid northern China. Four stages were identified from the last ca. 150 years: (1) the natural evolution stage (AD 1870–1945), in which there was a wet climate around Ganggeng Nur and the lake level rose from increased runoff; (2) the human disturbance stage (AD 1945–1967), in which the regional climate got drier and human activities began having a detectable effect on the grassland ecosystem; (3) the human transformation stage (AD 1967–2005), in which a completely arid climate coupled with the implementation of a series of land reclamation policies resulted in a large reduction in grassland areas, extensive soil erosion, exacerbated climate change, and shrinking lake areas; and (4) the posttreatment stage (AD 2005–2018), in which soil erosion was alleviated by policy implementation and a favorable humid climate.

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Section: Discussionmentioning

confidence: 99%

Changes in the lake-grassland ecosystem revealed by multiple proxies in a sediment core from Ganggeng Nur Lake, northern China

Zhang²,

et al. 2023

Quat. res.

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“…The study sites were sampled in November 2009, and four sediment cores were collected from different sites of the wetland, and each core was divided into 2 cm sub-layers. A comparison experiment of sediment parameters in the parallel layer of multi-sediment cores was performed [30]. For the comparably stable region, the sedimentary condition tends to be sequential and show consistent trend.…”

Section: Methodsmentioning

confidence: 99%

Linking Water Quality and Quantity in Environmental Flow Assessment in Deteriorated Ecosystems: A Food Web View

Chen

Guo

et al. 2013

PLoS ONE

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Most rivers worldwide are highly regulated by anthropogenic activities through flow regulation and water pollution. Environmental flow regulation is used to reduce the effects of anthropogenic activities on aquatic ecosystems. Formulating flow alteration–ecological response relationships is a key factor in environmental flow assessment. Traditional environmental flow models are characterized by natural relationships between flow regimes and ecosystem factors. However, food webs are often altered from natural states, which disturb environmental flow assessment in such ecosystems. In ecosystems deteriorated by heavy anthropogenic activities, the effects of environmental flow regulation on species are difficult to assess with current modeling approaches. Environmental flow management compels the development of tools that link flow regimes and food webs in an ecosystem. Food web approaches are more suitable for the task because they are more adaptive for disordered multiple species in a food web deteriorated by anthropogenic activities. This paper presents a global method of environmental flow assessment in deteriorated aquatic ecosystems. Linkages between flow regimes and food web dynamics are modeled by incorporating multiple species into an ecosystem to explore ecosystem-based environmental flow management. The approach allows scientists and water resources managers to analyze environmental flows in deteriorated ecosystems in an ecosystem-based way.

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“…Historical water levels have been reconstructed using the indicative diatom species in the sediment core (Chen et al, 2013). According to the constructing time of the hydraulic projects on the upper reach of the lake and the dating results, the sediment core was separated into the relatively natural part (1827-1947 yr., lower layer: 80 -14cm) and the humandisturbed part (1948 -2008 yr., upper layer: 14 -0cm) (Guo et al, 2012). The water levels fluctuated from 6.5 m to 9.5m during the period of 180 years (Fig.…”

Section: Response Of Diatom Assemblages To Environmental Variablesmentioning

confidence: 95%

“…The sediment core was segmented at 2cm interval and separated into 40 layers. The dating results of the sediment core have been introduced in the study of Guo et al (2012). Surface sediments were collected elaborately to reflect seasonal variations of sediments.…”

Section: Study Area and Sampling Sitesmentioning

confidence: 99%

“…RDA with one constrained axis indicates that pH, water level and TOC account for 13.1%, 9.7% and 8.8% of species variance respectively. The distribution of environmental variables in the sediment core has been introduced in the study of Guo et al (2012). Three selected environmental variables, TOC, pH, and water level, explain 12.5% of the total variance of the diatom assemblages in the sediment core.…”

Section: Response Of Diatom Assemblages To Environmental Variablesmentioning

confidence: 99%

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Spatio-Temporal Response of Sedimentary Diatoms to Water Level in a Shallow Lake

Guo¹

2016

Appl Ecol Env Res

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Abstract. In recent years, human activities have resulted in variations of hydraulic conditions in shallow lakes, thereby affecting interactions between environmental variables and aquatic plants. This feedback of plants on environmental changes is largely recorded in lake sediments. In this study we collected surface sediments in different seasons and a sediment core from a shallow lake Baiyangdian. We investigated the seasonal effects of water level and six physicochemical variables in surface sediments, as well as their impacts on the distribution of diatom assemblages. Therein the response of diatom assemblages to water level and the spatio-temporal effects of water level are highly emphasized. Results indicate that water level significantly changes between seasons, however there is no significant seasonal effects for the composition of grain size. The lake productivity increases with the vigorous growth of aquatic plants. Water level largely determines the distribution of diatom assemblages in surface sediments and the sediment core. Spatial isolation causes the difference between the habitats and alters the relation between water level and diatom taxa. Human activities also affect the relevance of water level with diatom assemblage. The results can provide the helpful information for the local water resource management.

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Pollen assemblages and their environmental correlates during the past 200 years inferred from sediments records in a shallow lake

Cited by 5 publications

References 24 publications

Changes in the lake-grassland ecosystem revealed by multiple proxies in a sediment core from Ganggeng Nur Lake, northern China

Changes in the lake-grassland ecosystem revealed by multiple proxies in a sediment core from Ganggeng Nur Lake, northern China

Linking Water Quality and Quantity in Environmental Flow Assessment in Deteriorated Ecosystems: A Food Web View

Spatio-Temporal Response of Sedimentary Diatoms to Water Level in a Shallow Lake

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