TY - JOUR
T1 - Karst-ecological changes during the middle and late Holocene in Southwest China revealed by δ18O and δ13C records in a stalagmite
AU - Duan, Rong
AU - Li, Ting Yong
AU - Li, Jun Yun
AU - Spötl, Christoph
AU - Li, Hong Chun
AU - Wang, Hai Bo
AU - Cheng, Hai
AU - Ning, You Feng
AU - Shen, Chuan Chou
AU - Zhou, Jing Li
AU - Chen, Chao Jun
AU - Yu, Tsai Luen
AU - Edwards, R. Lawrence
AU - Liu, Zi Qi
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/4/1
Y1 - 2023/4/1
N2 - Rocky desertification is a major environmental problem in the karst regions of Southwest China and seriously impacts ecological and socioeconomic development. Human activities and climate change have been proposed as the main factors responsible for the development and expansion of rocky desertification, but more evidence is needed to support this hypothesis. In this study, the history of the Asian summer monsoon (ASM) since 6200 yr BP is reconstructed based on 230Th dating and δ18O and δ13C data of a stalagmite from Feilong Cave in Guizhou Province of Southwest China. Positive δ18O and δ13C excursions record eleven interdecadal–centennial weak summer monsoon events at 1000–870, 1660–1460, 2040–1900, 2780–2460, 3020–2860, 3250–3120, 3650–3370, 4273–3980, 4820–4480, 5370–5180, and 5840–5560 yr BP. These weak ASM events were controlled by a southward shift of the Intertropical Convergence Zone and frequent El Niño events. Changes in the δ13C values of this stalagmite were mainly driven by changes in vegetation coverage and type, soil microbial activity, and regional hydrogeological conditions. The simultaneous positive excursions of δ18O and δ13C at ∼5500, 4200, and 2800 yr BP indicate a degradation of the karst ecological environment in response to the weak summer monsoon. In addition, frequent dynasty changes in China since 3000 yr BP profoundly influenced the karst ecological environment. During the Medieval Warm Period, the Jing-Kang event (JK event) resulted in the fall of the Northern Song Dynasty and led to a large-scale migration into southern China. As a consequence, the population increase in the Yangtze River basin enhanced land use, accelerated the disappearance of forests, and finally resulted in the deterioration of the regional environment. We conclude that climate change and anthropogenic activity may have jointly triggered and/or exacerbated rocky desertification in Southwest China.
AB - Rocky desertification is a major environmental problem in the karst regions of Southwest China and seriously impacts ecological and socioeconomic development. Human activities and climate change have been proposed as the main factors responsible for the development and expansion of rocky desertification, but more evidence is needed to support this hypothesis. In this study, the history of the Asian summer monsoon (ASM) since 6200 yr BP is reconstructed based on 230Th dating and δ18O and δ13C data of a stalagmite from Feilong Cave in Guizhou Province of Southwest China. Positive δ18O and δ13C excursions record eleven interdecadal–centennial weak summer monsoon events at 1000–870, 1660–1460, 2040–1900, 2780–2460, 3020–2860, 3250–3120, 3650–3370, 4273–3980, 4820–4480, 5370–5180, and 5840–5560 yr BP. These weak ASM events were controlled by a southward shift of the Intertropical Convergence Zone and frequent El Niño events. Changes in the δ13C values of this stalagmite were mainly driven by changes in vegetation coverage and type, soil microbial activity, and regional hydrogeological conditions. The simultaneous positive excursions of δ18O and δ13C at ∼5500, 4200, and 2800 yr BP indicate a degradation of the karst ecological environment in response to the weak summer monsoon. In addition, frequent dynasty changes in China since 3000 yr BP profoundly influenced the karst ecological environment. During the Medieval Warm Period, the Jing-Kang event (JK event) resulted in the fall of the Northern Song Dynasty and led to a large-scale migration into southern China. As a consequence, the population increase in the Yangtze River basin enhanced land use, accelerated the disappearance of forests, and finally resulted in the deterioration of the regional environment. We conclude that climate change and anthropogenic activity may have jointly triggered and/or exacerbated rocky desertification in Southwest China.
KW - Asian summer monsoon
KW - Karst
KW - Middle and late Holocene
KW - Societal changes
KW - Speleothems
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U2 - 10.1016/j.palaeo.2023.111437
DO - 10.1016/j.palaeo.2023.111437
M3 - Article
AN - SCOPUS:85147985441
SN - 0031-0182
VL - 615
JO - Palaeogeography, Palaeoclimatology, Palaeoecology
JF - Palaeogeography, Palaeoclimatology, Palaeoecology
M1 - 111437
ER -
