首页|Human disturbance exacerbated erosion and deposition in the karst peak-cluster depressions during the Ming and Qing dynasties

Human disturbance exacerbated erosion and deposition in the karst peak-cluster depressions during the Ming and Qing dynasties

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Human disturbance exacerbated erosion and deposition in the karst peak-cluster depressions during the Ming and Qing dynasties
Under the background of large-scale ecological restoration,China's southwestern karst region has become a hotspot of global vegetation cover"greening"in the past 20 years.However,because of geological constraints,it is difficult to restore the forest landscapes in some areas.It is urgent to understand the impacts of human disturbances during the historical period on the difficult-to-forestation rocky-desertification areas of the karst region in order to guide future afforestation.In this study,we quantified the changes of specific sediment yield in typical karst depressions over the past 500 years by using 137Cs,210Pb,and 14C dating methods in karst depressions,and identified the main human disturbances related to historical erosion and sedi-mentation by combining with historical data.The results showed that the erosion and sedimentation of the three depressions in 1921-1963 were significantly higher than that in 1963-2021,and the sedimentation rate(0.64-1.33 cm a-1)and the specific sediment yield(2.51-13.11 tha-1 a-1)during Ming and Qing dynasties(1504-1812)were higher than the sedimentation rate(0.26-0.95 cm a-1)and specific sediment yield(0.95-6.99t ha-1 a-1)in the recent century(1921-2021).Reconstruction data and literature from the Ming and Qing dynasties show an empirical link between changes in population,arable land,food,forest area,and deforestation events during the same period.It was found that the population and arable land in Guangxi increased more than three-fold and the forest area decreased significantly in the 17th century after the migration of the Yao ethnic group and the introduction of maize to the region,which may be the main reason for intensifying the erosion of depressions.This study is of great significance to understanding the evolution history of rocky desertification in this region and to answer the potential of afforestation.

Karst region4C datingPeak-cluster depressionsEthnic minirity migrationSpecific sediment yield

Shuai YUAN、Yuemin YUE、Xinbao ZHANG、Lu WANG、Lu ZHAI、Kelin WANG

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Key Laboratory for Agro-Ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China

Huanjiang Observation and Research Station for Karst Ecosystems,Chinese Academy of Sciences,Huanjiang 547100,China

University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Mountain Hazards and Environment,Ministry of Water Resources,Chinese Academy of Sciences,Chengdu 610041,China

State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China

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Karst region 4C dating Peak-cluster depressions Ethnic minirity migration Specific sediment yield

2024

10.1007/s11430-023-1406-y

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(11)