scholarly journals Lake environmental changes in response to acid deposition in Southwest China over the last century: Evidence from sedimentary diatoms in Lake Longtan of the Simian Mountains

2021 ◽  
Vol 33 (6) ◽  
pp. 1940-1950
Author(s):  
Guan Xidong ◽  
◽  
Jiang Hongchen ◽  
Jiang Ying ◽  
Chen Xu
Keyword(s):  
Acid Deposition ◽  
Southwest China ◽  
Environmental Changes ◽  
Sedimentary Diatoms

scholarly journals Acid deposition and lake chemistry in southwest China

1994 ◽  
Vol 75 (1-2) ◽  
pp. 61-78 ◽  
Author(s):  
H. B. Xue ◽  
J. L. Schnoor
Keyword(s):  
Acid Deposition ◽  
Southwest China ◽  
Lake Chemistry

Devoke Water and Loch Sionascaig: recent environmental changes and the post-glacial overview

1990 ◽  
Vol 327 (1240) ◽  
pp. 349-355 ◽  
Keyword(s):  
Acid Deposition ◽  
Environmental Changes ◽  
Glacial Period ◽  
Oligotrophic Lakes

Diatoms from postglacial sediments of two oligotrophic lakes, one in northwest England and one in northwest Scotland, have been examined. Apart from the decline of alkalinity in the early post-glacial period at both sites, the only evidence for further increase in acidity occurs in the post-1900 sediments of Devoke Water (Cumbria). There has been no such change in Loch Sionascaig, in a region of lower acid deposition in northwest Scotland.

Direct versus indirect climate controls on Holocene diatom assemblages in a sub-tropical deep, alpine lake (Lugu Hu, Yunnan, SW China)

2016 ◽  
Vol 86 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Qian Wang ◽  
Xiangdong Yang ◽  
Nicholas John Anderson ◽  
Xuhui Dong
Keyword(s):  
Thermal Stratification ◽  
Nutrient Dynamics ◽  
Southwest China ◽  
Environmental Changes ◽  
Alpine Lake ◽  
Ecological Change ◽  
Diatom Assemblages ◽  
Lake Ecology ◽  
Temperature And Precipitation ◽  
Lake Lugu

AbstractThe reconstruction of Holocene environmental changes in lakes on the plateau region of southwest China provides an understanding of how these ecosystems may respond to climate change. Fossil diatom assemblages were investigated from an 11,000-year lake sediment core from a deep, alpine lake (Lugu Hu) in southwest China, an area strongly influenced by the southwest (or the Indian) summer monsoon. Changes in diatom assemblage composition, notably the abundance of the two dominant planktonic species, Cyclotella rhomboideo-elliptica and Cyclostephanos dubius, reflect the effects of climate variability on nutrient dynamics, mediated via thermal stratification (internal nutrient cycling) and catchment-vegetation processes. Statistical analyses of the climateediatom interactions highlight the strong effect of changing orbitally-induced solar radiation during the Holocene, presumably via its effect on the lake’s thermal budget. In a partial redundancy analysis, climate (solar insolation) and proxies reflecting catchment process (pollen percentages, C/N ratio) were the most important drivers of diatom ecological change, showing the strong effects of climateecatchmentevegetation interactions on lake functioning. This diatom record reflects long-term ontogeny of the lake-catchment ecosystem and suggests that climatic changes (both temperature and precipitation) impact lake ecology indirectly through shifts in thermal stratification and catchment nutrient exports.

scholarly journals Distribution, water quality, and health risk assessment of trace elements in three streams during the wet season, Guiyang, Southwest China

Elem Sci Anth ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Jue Zhang ◽  
Qixin Wu ◽  
Zhuhong Wang ◽  
Shilin Gao ◽  
Huipeng Jia ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Trace Elements ◽  
Health Risk ◽  
Trace Element ◽  
Human Activities ◽  
Southwest China ◽  
Environmental Changes ◽  
Urban Stream ◽  
Human Beings ◽  
Element Concentrations

Trace element pollution derived from human activities in aquatic systems has raised widespread concerns due to its toxicity, persistence, and bioaccumulation. In this article, we presented a systematic investigation of the anthropogenic overprints on trace elements geochemistry in three streams of the human-impacted (agriculture, urban area, and abandoned mining), located at Lake Aha, Guiyang, Southwest China. Concentrations reported in the study demonstrated that the abandoned mining stream showed the highest trace elements (608.16 μg/L), followed by the urban stream (566.11 μg/L) and agricultural stream (457.51 μg/L). Nonmetric multidimensional scaling (NMDS), used to display sampling dates and trace elements, showed discernible temporal variation in trace element concentrations. Trace element concentrations in months (May, September, and October) with less rainfall were higher than in June, July, and August indicated by NMDS. Principal component analysis (PCA) had shown that As, Ba, Mo, and Zn were mainly impacted by the urbanized streams, and Fe and Sr influenced by the mine. Risk assessment of human beings to trace elements demonstrated that As may pose a detrimental health risk. The research found that trace elements were potential tracers for the presence of human activities and environmental changes.

Effect of acid deposition on trichome morphology and dogwood anthracnose biology

1992 ◽  
Vol 50 (1) ◽  
pp. 840-841
Author(s):  
Kyle T. Thornham ◽  
R. Jay Stipes ◽  
Randolph L. Grayson
Keyword(s):  
Acid Deposition ◽  
Disease Incidence ◽  
Natural Populations ◽  
Tree Disease ◽  
Flowering Dogwood ◽  
Discula Destructiva ◽  
Disease Induction ◽  
Dogwood Anthracnose ◽  
Trichome Morphology ◽  
Precipitation Events

Dogwood anthracnose, caused by Discula destructiva (1), is another new catastrophic tree disease that has ravaged natural populations of the flowering dogwood (Cornus florida) in the Appalachians over the past 15 years, and the epidemic is prognosticated to continue (2). An estimated 9.5 million acres have been affected, primarily in the Appalachian Mountains, from VA southwards, alone, and an estimated 50% of all dogwoods in PA have been killed. Since acid deposition has been linked experimentally with disease induction, and since the disease incidence and severity are more pronounced at higher elevations where lower pH precipitation events occur, we investigated the effect of acidic foliar sprays on moiphologic changes in the foliar cuticle and trichomes (3), the initial sites of infection and foci of Discula sporulation.

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