干旱区生态环境知识资源中心(Arid): Climate change as the dominant driver of recent ecological changes in a semi-arid alpine lake from the Chinese Loess Plateau

Arid

DOI	10.1007/s10933-020-00167-5
	Climate change as the dominant driver of recent ecological changes in a semi-arid alpine lake from the Chinese Loess Plateau
	Yan, Xinwei; Liu, Jianbao; Ruhland, Kathleen M.; Smol, John P.; Chen, Fahu
通讯作者	Liu, JB (corresponding author), Lanzhou Univ, Coll Earth & Environm Sci, Ctr Pan Third Pole Environm Pan TPE, Key Lab Western Chinas Environm Syst,Minist Educ, Lanzhou 730000, Peoples R China.
来源期刊	JOURNAL OF PALEOLIMNOLOGY
ISSN	0921-2728
EISSN	1573-0417
出版年	2021-01
英文摘要	Semi-arid areas of northern China are under increasing pressures from anthropogenic activities and climate change. Although wetland areas in these drylands have experienced dramatic, unidirectional shifts in their ecological status in recent centuries, fundamental driving forces are poorly quantified. Here, we examine changes in sedimentary proxies (diatoms, spectrally-inferred chlorophyll-a, stable isotopes) preserved in a radiometrically-dated core from Tianchi Lake, an alpine lake within the margin of the East Asian Summer Monsoon (EASM) limit in China's southwestern Loess Plateau. Our algal trends were compared with regional instrumental records, changes in EASM intensity, and with previously published paleolimnological data from this same lake to determine the principal drivers of regional ecological changes. We found no clear evidence that geochemical and biological proxies were strongly affected by deforestation and other human activities. Major environmental changes during the past similar to 200 years were found to be predominantly driven by climatic fluctuations, extreme precipitation events, and changes in EASM intensity. Prior to similar to 1965 CE, diatom assemblages indicate an oligotrophic, clear water state. Shifts in dominance between benthic Staurosirella pinnata and planktonic Lindavia comensis were likely controlled by ice-cover dynamics. Between similar to 1965 and 1980 CE an abrupt shift to a turbid water state during a period of extreme precipitation events was caused by excessive nutrient-laden soil erosion in the already susceptible deforested catchment. This turbid period was evidenced by a rapid increase to dominance of Achnanthidium minutissimum, a sharp decline in oligotrophic Lindavia comensis, increased primary production, and peaks in sediment grain size and SiO2 content. Post- similar to 1980 CE, we provide evidence that a shift towards planktonic diatom dominance can best be explained by changes in climate and EASM intensity, despite substantial nitrogen deposition in the region during the past few decades. Specifically, a drier and warmer climate together with weakened EASM wind strength resulted in decreased erosion and a return to a clear water state, coupled with enhanced thermal stability. Collectively, these observations expand our understanding of how changes in climate, extreme precipitation events, and fluctuations in EASM intensity influence semi-arid alpine lakes in northern China, as well as climate's leading role in driving ecological change over the past two centuries, despite the intensification of human disturbances during recent decades.
英文关键词	Diatoms Anthropogenic activity Lake ecosystem Climatic extremes Nitrogen deposition Summer monsoon
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000605491600001
WOS关键词	DIATOM CYCLOTELLA-COMENSIS ; LATE HOLOCENE ; SOIL-EROSION ; TIANCHI LAKE ; BIOGEOCHEMICAL RESPONSES ; EXTREME PRECIPITATION ; NITROGEN DEPOSITION ; ECOSYSTEM STRUCTURE ; LAST MILLENNIUM ; MOUNTAIN LAKES
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Limnology
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Marine & Freshwater Biology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352336
作者单位	[Yan, Xinwei; Liu, Jianbao; Chen, Fahu] Lanzhou Univ, Coll Earth & Environm Sci, Ctr Pan Third Pole Environm Pan TPE, Key Lab Western Chinas Environm Syst,Minist Educ, Lanzhou 730000, Peoples R China; [Liu, Jianbao; Chen, Fahu] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China; [Ruhland, Kathleen M.; Smol, John P.] Queens Univ, Dept Biol, Paleoecol Environm Assessment & Res Lab PEARL, Kingston, ON K7L 3N6, Canada
推荐引用方式 GB/T 7714	Yan, Xinwei,Liu, Jianbao,Ruhland, Kathleen M.,et al. Climate change as the dominant driver of recent ecological changes in a semi-arid alpine lake from the Chinese Loess Plateau[J]. 兰州大学,2021.
APA	Yan, Xinwei,Liu, Jianbao,Ruhland, Kathleen M.,Smol, John P.,&Chen, Fahu.(2021).Climate change as the dominant driver of recent ecological changes in a semi-arid alpine lake from the Chinese Loess Plateau.JOURNAL OF PALEOLIMNOLOGY.
MLA	Yan, Xinwei,et al."Climate change as the dominant driver of recent ecological changes in a semi-arid alpine lake from the Chinese Loess Plateau".JOURNAL OF PALEOLIMNOLOGY (2021).