Environmental change and human land-use over the past 200 years in the Great Hinggan Mountains, Northeastern China

	Environmental change and human land-use over the past 200 years in the Great Hinggan Mountains, Northeastern China
	Mackenzie, Lydia L.; Bao, Kunshan; Pratte, Steve; Klamt, Anna-Marie; Liu, Rongqin; Aquino-Lopez, Marco A.; Zawadzki, Atun; Amiri, Bahman Jabbarian; Shen, Ji; Le Roux, Gael
刊名	LAND DEGRADATION & DEVELOPMENT
	2020
卷号	32 期号:2 页码:993-1007
英文摘要	Mountain ecosystems are sensitive to environmental changes and are affected by direct and indirect anthropogenic activities. This study sought to understand the impacts of human occupation, environmental and climate change on the Great Hinggan Mountains (GHM) in Northeastern China. The last 200 years of environmental changes are reconstructed by analyzing sediment cores from five small mountain lakes. Cores were dated using(210)Pb and(137)Cs radioisotopes, microscopic charcoal identified regional fire activity and fossil pollen analysis reconstructed temporal and spatial changes in vegetation. Peaks in(137)Cs,Ra-226 and microscopic charcoal flux were found to follow similar trends between sites. The radioisotope records reflect redistribution processes, such as erosion and fire events, which overwhelm the atmospheric fallout signal in the GHM. Microscopic charcoal increased from 1950 CE and peaked at all sites after 2000 CE suggesting that current fire management, coupled with a warmer climate due to global warming, may be leading to more wildfire events in the region.Pinus,QuercusandBetuladeclined at all sites as human occupation occurred in the early 1900s. Initially, open forest and grassland expanded in response to overexploitation of forests, followed by arboreal pollen reaching maximum values after 2000 CE. This study concludes that the present-day mixed coniferous broad-leaved forest dominating the southern region of the GHM is a product of changing fire activity, excessive logging and, more recently, forestry management and vegetation regeneration. Results suggest further management strategies are needed to address land degradation and wildfire events in mountain regions of Northeastern China.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20185]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Mackenzie, Lydia L.,Bao, Kunshan,Pratte, Steve,et al. Environmental change and human land-use over the past 200 years in the Great Hinggan Mountains, Northeastern China[J]. LAND DEGRADATION & DEVELOPMENT,2020,32(2):993-1007.
APA	Mackenzie, Lydia L..,Bao, Kunshan.,Pratte, Steve.,Klamt, Anna-Marie.,Liu, Rongqin.,...&Le Roux, Gael.(2020).Environmental change and human land-use over the past 200 years in the Great Hinggan Mountains, Northeastern China.LAND DEGRADATION & DEVELOPMENT,32(2),993-1007.
MLA	Mackenzie, Lydia L.,et al."Environmental change and human land-use over the past 200 years in the Great Hinggan Mountains, Northeastern China".LAND DEGRADATION & DEVELOPMENT 32.2(2020):993-1007.