干旱区生态环境知识资源中心(Arid): Long-term dynamics of organic matter inputs in sediments of Lake Balkhash, arid Central Asia: Coupled climate and anthropogenic influences

Arid

DOI	10.1016/j.catena.2024.108205
	Long-term dynamics of organic matter inputs in sediments of Lake Balkhash, arid Central Asia: Coupled climate and anthropogenic influences
	Zhang, Hongliang; Wu, Jinglu; Guo, Ru; Ma, Long
通讯作者	Wu, JL
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	243
英文摘要	Lake sediments as reservoirs of organic matter (OM) play crucial roles in the carbon burial and carbon cycle on the regional and global scales. However, the long-term history and patterns of sedimentary organic matter (SOM) inputs from various sources and its response to multiple drivers are not well constrained. Here, we demonstrated variations in the source and composition of SOM and the potential regulating factors using the multi-biomarker (n-alkanes, fatty acids, and alcohols) signatures in a core span the last - 250 years from Lake Balkhash. The highest Paq (proportions of aquatic macrophytes) and relatively low short-chain lipid contents in sediments before 1860 CE indicate the dominant OM inputs from aquatic macrophytes and minor inputs from microalgae. This can be attributed to the humid conditions during the late Little Ice Age (LIA). The decreased Paq and the highest CPIH (carbon preference index for high molecular weight) in sediments deposited in 1860 - 1930 CE revealed considerably elevated OM inputs from emergent plants coeval with declined aquatic macrophytes contributions. This pattern of OM inputs was likely caused by large variables of water levels during the climate transition period, promoting the growth of emergent plants and inhibited aquatic macrophytes. In sediments from 1930 - 2016 CE, much higher terrestrial OM inputs and prevailing microalgal OM inputs were reflected by the highest principal components of each source, whereas the lowest Paq indicates minimal OM inputs from aquatic macrophytes. These changes were probably caused by intensification of anthropogenic perturbations, e. g., land reclamation, promoting more terrestrial OM and nutrients transported into the lake. These findings suggested that SOM inputs are highly linked to lake environmental changes and can be profoundly influenced by climate variability and anthropogenic activities, which provides insights into patterns of carbon burial and carbon cycle in lake-catchment systems in arid regions.
英文关键词	Sedimentary organic matter Lipid biomarkers Climate shifts Land-use change Lake Balkhash
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001259593400001
WOS关键词	ALKANE DISTRIBUTIONS ; TERRESTRIAL PLANTS ; SUBMERGED PLANTS ; LIPID BIOMARKERS ; HUMAN IMPACT ; FATTY-ACIDS ; GEOCHEMISTRY ; LACUSTRINE ; RECORDS ; SYSTEM
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403164
推荐引用方式 GB/T 7714	Zhang, Hongliang,Wu, Jinglu,Guo, Ru,et al. Long-term dynamics of organic matter inputs in sediments of Lake Balkhash, arid Central Asia: Coupled climate and anthropogenic influences[J],2024,243.
APA	Zhang, Hongliang,Wu, Jinglu,Guo, Ru,&Ma, Long.(2024).Long-term dynamics of organic matter inputs in sediments of Lake Balkhash, arid Central Asia: Coupled climate and anthropogenic influences.CATENA,243.
MLA	Zhang, Hongliang,et al."Long-term dynamics of organic matter inputs in sediments of Lake Balkhash, arid Central Asia: Coupled climate and anthropogenic influences".CATENA 243(2024).