Xiaoyi Dong , Huayu Lu , Chenghong Liang , Hongyan Zhang , Michael Meadows , Cheng Zhao , Shuangwen Yi , Yao Wang , Yao Gu , Fan Yang , Fuzhi Lu
{"title":"近两个冰期-间冰期旋回中国南方C3/C4植被动态及水文气候变化","authors":"Xiaoyi Dong , Huayu Lu , Chenghong Liang , Hongyan Zhang , Michael Meadows , Cheng Zhao , Shuangwen Yi , Yao Wang , Yao Gu , Fan Yang , Fuzhi Lu","doi":"10.1016/j.quascirev.2025.109507","DOIUrl":null,"url":null,"abstract":"<div><div>The responses of climate and environment in the tropical-subtropical monsoon region of East Asia to both internal and external forcings remain poorly understood, largely due to the scarcity of high-resolution terrestrial records that span multiple glacial-interglacial cycles. In this study, we present an organic carbon isotope (δ<sup>13</sup>C<sub>org</sub>) record from Tianyang maar lake in Guangdong Province, tropical South China, covering the past ∼250 kyr. This record reflects significant variations in the relative abundance of C<sub>3</sub> and C<sub>4</sub> biomass in the local terrestrial vegetation at orbital timescales, which we contend are primarily driven by changes in regional precipitation. Specifically, C<sub>4</sub> plants dominate in the drier climates of glacial periods, while C<sub>3</sub> plants thrive in the more humid conditions of interglacial periods. Superimposed on glacial-interglacial alternations, C<sub>3</sub>/C<sub>4</sub> vegetation composition and associated precipitation exhibit high-frequency fluctuations, for which corresponding spectral analysis reveals prominent half-precession signals. This suggests a linkage between the ecosystem and hydroclimate dynamics in the study region and equatorial insolation at orbital timescales, with El Niño/Southern Oscillation (ENSO)-like variability possibly acting as a bridging mechanism. Our findings highlight the combined influence of glacial and low-latitude insolation forcings on terrestrial ecosystems and hydroclimate in tropical East Asia, thereby enhancing our understanding of the variability and forcing mechanisms of the East Asian Summer Monsoon (EASM) during the late Quaternary.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"366 ","pages":"Article 109507"},"PeriodicalIF":3.2000,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"C3/C4 vegetation dynamics and hydroclimate variations in South China over the last two glacial-interglacial cycles\",\"authors\":\"Xiaoyi Dong , Huayu Lu , Chenghong Liang , Hongyan Zhang , Michael Meadows , Cheng Zhao , Shuangwen Yi , Yao Wang , Yao Gu , Fan Yang , Fuzhi Lu\",\"doi\":\"10.1016/j.quascirev.2025.109507\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The responses of climate and environment in the tropical-subtropical monsoon region of East Asia to both internal and external forcings remain poorly understood, largely due to the scarcity of high-resolution terrestrial records that span multiple glacial-interglacial cycles. In this study, we present an organic carbon isotope (δ<sup>13</sup>C<sub>org</sub>) record from Tianyang maar lake in Guangdong Province, tropical South China, covering the past ∼250 kyr. This record reflects significant variations in the relative abundance of C<sub>3</sub> and C<sub>4</sub> biomass in the local terrestrial vegetation at orbital timescales, which we contend are primarily driven by changes in regional precipitation. Specifically, C<sub>4</sub> plants dominate in the drier climates of glacial periods, while C<sub>3</sub> plants thrive in the more humid conditions of interglacial periods. Superimposed on glacial-interglacial alternations, C<sub>3</sub>/C<sub>4</sub> vegetation composition and associated precipitation exhibit high-frequency fluctuations, for which corresponding spectral analysis reveals prominent half-precession signals. This suggests a linkage between the ecosystem and hydroclimate dynamics in the study region and equatorial insolation at orbital timescales, with El Niño/Southern Oscillation (ENSO)-like variability possibly acting as a bridging mechanism. Our findings highlight the combined influence of glacial and low-latitude insolation forcings on terrestrial ecosystems and hydroclimate in tropical East Asia, thereby enhancing our understanding of the variability and forcing mechanisms of the East Asian Summer Monsoon (EASM) during the late Quaternary.</div></div>\",\"PeriodicalId\":20926,\"journal\":{\"name\":\"Quaternary Science Reviews\",\"volume\":\"366 \",\"pages\":\"Article 109507\"},\"PeriodicalIF\":3.2000,\"publicationDate\":\"2025-07-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Quaternary Science Reviews\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0277379125003270\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOGRAPHY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Quaternary Science Reviews","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0277379125003270","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOGRAPHY, PHYSICAL","Score":null,"Total":0}
C3/C4 vegetation dynamics and hydroclimate variations in South China over the last two glacial-interglacial cycles
The responses of climate and environment in the tropical-subtropical monsoon region of East Asia to both internal and external forcings remain poorly understood, largely due to the scarcity of high-resolution terrestrial records that span multiple glacial-interglacial cycles. In this study, we present an organic carbon isotope (δ13Corg) record from Tianyang maar lake in Guangdong Province, tropical South China, covering the past ∼250 kyr. This record reflects significant variations in the relative abundance of C3 and C4 biomass in the local terrestrial vegetation at orbital timescales, which we contend are primarily driven by changes in regional precipitation. Specifically, C4 plants dominate in the drier climates of glacial periods, while C3 plants thrive in the more humid conditions of interglacial periods. Superimposed on glacial-interglacial alternations, C3/C4 vegetation composition and associated precipitation exhibit high-frequency fluctuations, for which corresponding spectral analysis reveals prominent half-precession signals. This suggests a linkage between the ecosystem and hydroclimate dynamics in the study region and equatorial insolation at orbital timescales, with El Niño/Southern Oscillation (ENSO)-like variability possibly acting as a bridging mechanism. Our findings highlight the combined influence of glacial and low-latitude insolation forcings on terrestrial ecosystems and hydroclimate in tropical East Asia, thereby enhancing our understanding of the variability and forcing mechanisms of the East Asian Summer Monsoon (EASM) during the late Quaternary.
期刊介绍:
Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.