气候变化领域集成服务门户(CCPortal): Biogeochemical responses to climate change and anthropogenic nitrogen deposition from a 200-year record from Tianchi Lake, Chinese Loess Plateau

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DOI	10.1016/j.quaint.2018.09.004
	Biogeochemical responses to climate change and anthropogenic nitrogen deposition from a 200-year record from Tianchi Lake, Chinese Loess Plateau
	Chen, Jie; Liu, Jianbao; Xie, Chengling; Chen, Guangjie; Chen, Jianhui; Zhang, Zhiping; Zhou, Aifeng; Ruhland, Kathleen M.; Smol, John P.; Chen, Fahu
通讯作者	Liu, JB (通讯作者)
发表日期	2018
ISSN	1040-6182
EISSN	1873-4553
起始页码	22
结束页码	30
卷号	493
英文摘要	Human activities over the last 100 years have fundamentally changed the biogeochemistry of the global nitrogen cycle. For example, increased nitrogen deposition from industrial and agricultural sources has been linked to lake acidification and nutrient fertilization, and thus it has the potential to significantly influence lake ecosystems. Records of anthropogenic nitrogen deposition from alpine lakes are sparse in China, which limits our understanding of its effects on remote alpine lake ecosystems. In this study, we analyzed multiple geochemical proxies at Tianchi Lake (2430 m a.s.l.), which is part of the Liupan Mountains National Nature Reserve in the central Chinese Loess Plateau (CLP). We measured total nitrogen (TN) concentrations, C/N ratios and nitrogen stable isotope ratios (S15N), as well as a biological proxy (spectrally-inferred chlorophyll a), from a well-dated sediment core spanning the past 200 years. Our aim was to examine anthropogenic nitrogen deposition to the lake and to assess its implications for lake primary production. We found that 815N was stable prior to 1980, but it decreased significantly thereafter. This is consistent with documented changes in anthropogenic nitrogen deposition over the past 200 years, and it indicates that the 815N record of Tianchi Lake likely reflects anthropogenic nitrogen deposition, at least in this region. Prior to 1980, the trend in primary production of Tianchi Lake agrees with the trend of reconstructed regional temperature, when reactive nitrogen emissions in China were very low. This suggests that temperature was likely the main factor driving lake primary production before 1980. Primary production has increased significantly since 1980, consistent with the continued rising temperature and with enhanced nitrogen deposition, indicating that both factors are simultaneous drivers. Although the current data for Tianchi Lake are insufficient to unequivocally determine which of the two stressors is more important after the 1980s, temperature likely played the more significant role in driving primary production. This is because the lake is phosphorus-limited today, and in addition there is a strong association between temperature and chlorophyll a over the past 200 years. Continuing global warming and increasing nitrogen deposition in the future will likely further affect the fragile alpine ecosystems in the region.
关键词	MOUNTAIN NATIONAL-PARK ORGANIC-MATTER NUTRIENT LIMITATION ALPINE LAKES SEDIMENTS ECOSYSTEM ISOTOPES PRODUCTIVITY 21ST-CENTURY REFLECTANCE
英文关键词	Nitrogen isotopes; Alpine lake; Chlorophyll a; Primary production; Palaeolimnology
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000447489200003
来源期刊	QUATERNARY INTERNATIONAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259279
推荐引用方式 GB/T 7714	Chen, Jie,Liu, Jianbao,Xie, Chengling,et al. Biogeochemical responses to climate change and anthropogenic nitrogen deposition from a 200-year record from Tianchi Lake, Chinese Loess Plateau[J]. 中国科学院青藏高原研究所,2018,493.
APA	Chen, Jie.,Liu, Jianbao.,Xie, Chengling.,Chen, Guangjie.,Chen, Jianhui.,...&Chen, Fahu.(2018).Biogeochemical responses to climate change and anthropogenic nitrogen deposition from a 200-year record from Tianchi Lake, Chinese Loess Plateau.QUATERNARY INTERNATIONAL,493.
MLA	Chen, Jie,et al."Biogeochemical responses to climate change and anthropogenic nitrogen deposition from a 200-year record from Tianchi Lake, Chinese Loess Plateau".QUATERNARY INTERNATIONAL 493(2018).