Zhang Chenhua, Peng Haijun, Wang Jie, Ding Hanwei, Yao Hu, Fan Baoxiang, Gao Yang, Hong Bing
湖泊沉积物氮同位素(δ15N)在古环境、古气候变化方面有着指示气候干湿变化的重要作用,但目前学界对于δ15N记录作为气候代用指标所指示的气候干湿变化特征仍缺乏深入探索。本文以贵州省梵净山九龙池湖泊沉积物为研究对象,分析并探讨δ15N所记录的梵净山地区气候干湿变化过程与特征,并结合总有机碳(TOC)、总氮(TN)和碳氮比值(C/N)数据进行对比研究,结果表明:(1)由于九龙池湖泊沉积物有机质受流域输入影响,气候湿润时,陆生植物增多,土壤湿度增大,外源输入对湖泊沉积物有机质影响增大,沉积物δ15N值偏负;气候干旱时,陆生植物减少,土壤湿度降低,外源输入对湖泊沉积物有机质影响减小,沉积物δ15N值偏正;(2)九龙池湖泊沉积物δ15N记录很好地揭示了梵净山地区全新世的气候干湿变化过程,即早期(11.5—9.2 ka B.P.)亚洲夏季风增强,气候从干旱期向湿润期转变,中期(9.2—3.0 ka B.P.)亚洲夏季风强盛,气候整体处于湿润期,晚期(3.0—2.2 ka B.P.)亚洲夏季风减弱,气候由湿润期向干旱期方向发展。该记录与中国西南地区其他气候代用指标所记录的全新世气候变化具有区域一致性,但在部分时段有明显差异,说明西南地区气候和环境演变即响应了全球性变化又有区域特征。本研究表明,九龙池湖泊沉积物δ15N记录可用于揭示研究区域全新世气候与环境变化的特征,是一种具有实用价值的古气候代用记录。;The nitrogen isotope (δ15N) of lake sediments plays an important role in indicating climate change in terms of paleoenvironment and palaeoclimate change. However, there is still a lack of in-depth research on the characteristics of climate change indicated by δ15N records as a proxy for climate change. This paper took the sediment of Jiulong Wetland in Fanjing Mountain, Guizhou Province, as a research object, and analysed and discussed the process and characteristics of dry and wet climate change in the Fanjing Mountain area recorded by δ15N, combined with the data of total organic carbon (TOC), total nitrogen (TN) and carbon-nitrogen ratio (C/N). Finally, a comparative study was carried out, the results showed that: (1) Because the organic matter in the sediment of Jiulong Wetland was mainly from the watershed, when the climate was wet, the soil moisture increased and terrestrial plants grew well, leading to the increased external input on the organic matter to the lake and the negative δ15N value of sediment.When the climate was dry, the terrestrial plants and soil moisture decreased, leading to the reduction of the impact of external input on the organic matter in the lake sediments, the δ15N value of sediments was positive. (2) The δ15N records of the Jiulong Wetland sediments revealed well the Holocene climatic processes (dry/wet changes) in the Fanjing Mountain area. In the early (11.5-9.2 ka B.P.), the Asian summer monsoon was enhanced, and the climate evolved from dry to wet. In the middle (9.2-3.0 ka B.P.), the Asian summer monsoon was strong and the climate was in an overall wet period. In the late period (3.0-2.2 ka B.P.), the Asian summer monsoon weakened and the climate evolved from wet to dry. This record is regionally consistent with Holocene climate change recorded by other climate proxy indicators in southwest China, their differences in some periods indicating significant regional characteristics. This study shows that the sediment δ15N record of Jiulong Wetland can be used to reconstruct the characteristics of Holocene climate and environmental changes in the study area, and it is a very useful palaeoclimate proxy record.
湖泊沉积物氮同位素(δ15N)在古环境、古气候变化方面有着指示气候干湿变化的重要作用,但目前学界对于δ15N记录作为气候代用指标所指示的气候干湿变化特征仍缺乏深入探索。本文以贵州省梵净山九龙池湖泊沉积物为研究对象,分析并探讨δ15N所记录的梵净山地区气候干湿变化过程与特征,并结合总有机碳(TOC)、总氮(TN)和碳氮比值(C/N)数据进行对比研究,结果表明:(1)由于九龙池湖泊沉积物有机质受流域输入影响,气候湿润时,陆生植物增多,土壤湿度增大,外源输入对湖泊沉积物有机质影响增大,沉积物δ15N值偏负;气候干旱时,陆生植物减少,土壤湿度降低,外源输入对湖泊沉积物有机质影响减小,沉积物δ15N值偏正;(2)九龙池湖泊沉积物δ15N记录很好地揭示了梵净山地区全新世的气候干湿变化过程,即早期(11.5—9.2 ka B.P.)亚洲夏季风增强,气候从干旱期向湿润期转变,中期(9.2—3.0 ka B.P.)亚洲夏季风强盛,气候整体处于湿润期,晚期(3.0—2.2 ka B.P.)亚洲夏季风减弱,气候由湿润期向干旱期方向发展。该记录与中国西南地区其他气候代用指标所记录的全新世气候变化具有区域一致性,但在部分时段有明显差异,说明西南地区气候和环境演变即响应了全球性变化又有区域特征。本研究表明,九龙池湖泊沉积物δ15N记录可用于揭示研究区域全新世气候与环境变化的特征,是一种具有实用价值的古气候代用记录。;The nitrogen isotope (δ15N) of lake sediments plays an important role in indicating climate change in terms of paleoenvironment and palaeoclimate change. However, there is still a lack of in-depth research on the characteristics of climate change indicated by δ15N records as a proxy for climate change. This paper took the sediment of Jiulong Wetland in Fanjing Mountain, Guizhou Province, as a research object, and analysed and discussed the process and characteristics of dry and wet climate change in the Fanjing Mountain area recorded by δ15N, combined with the data of total organic carbon (TOC), total nitrogen (TN) and carbon-nitrogen ratio (C/N). Finally, a comparative study was carried out, the results showed that: (1) Because the organic matter in the sediment of Jiulong Wetland was mainly from the watershed, when the climate was wet, the soil moisture increased and terrestrial plants grew well, leading to the increased external input on the organic matter to the lake and the negative δ15N value of sediment.When the climate was dry, the terrestrial plants and soil moisture decreased, leading to the reduction of the impact of external input on the organic matter in the lake sediments, the δ15N value of sediments was positive. (2) The δ15N records of the Jiulong Wetland sediments revealed well the Holocene climatic processes (dry/wet changes) in the Fanjing Mountain area. In the early (11.5-9.2 ka B.P.), the Asian summer monsoon was enhanced, and the climate evolved from dry to wet. In the middle (9.2-3.0 ka B.P.), the Asian summer monsoon was strong and the climate was in an overall wet period. In the late period (3.0-2.2 ka B.P.), the Asian summer monsoon weakened and the climate evolved from wet to dry. This record is regionally consistent with Holocene climate change recorded by other climate proxy indicators in southwest China, their differences in some periods indicating significant regional characteristics. This study shows that the sediment δ15N record of Jiulong Wetland can be used to reconstruct the characteristics of Holocene climate and environmental changes in the study area, and it is a very useful palaeoclimate proxy record.
{"title":"Nitrogen isotopic composition of Jiulong Wetland sediments in Fanjing Mountain and Holocene climate evolution process","authors":"Zhang Chenhua, Peng Haijun, Wang Jie, Ding Hanwei, Yao Hu, Fan Baoxiang, Gao Yang, Hong Bing","doi":"10.18307/2023.0551","DOIUrl":"https://doi.org/10.18307/2023.0551","url":null,"abstract":"湖泊沉积物氮同位素(δ<sup>15</sup>N)在古环境、古气候变化方面有着指示气候干湿变化的重要作用,但目前学界对于δ<sup>15</sup>N记录作为气候代用指标所指示的气候干湿变化特征仍缺乏深入探索。本文以贵州省梵净山九龙池湖泊沉积物为研究对象,分析并探讨δ<sup>15</sup>N所记录的梵净山地区气候干湿变化过程与特征,并结合总有机碳(TOC)、总氮(TN)和碳氮比值(C/N)数据进行对比研究,结果表明:(1)由于九龙池湖泊沉积物有机质受流域输入影响,气候湿润时,陆生植物增多,土壤湿度增大,外源输入对湖泊沉积物有机质影响增大,沉积物δ<sup>15</sup>N值偏负;气候干旱时,陆生植物减少,土壤湿度降低,外源输入对湖泊沉积物有机质影响减小,沉积物δ<sup>15</sup>N值偏正;(2)九龙池湖泊沉积物δ<sup>15</sup>N记录很好地揭示了梵净山地区全新世的气候干湿变化过程,即早期(11.5—9.2 ka B.P.)亚洲夏季风增强,气候从干旱期向湿润期转变,中期(9.2—3.0 ka B.P.)亚洲夏季风强盛,气候整体处于湿润期,晚期(3.0—2.2 ka B.P.)亚洲夏季风减弱,气候由湿润期向干旱期方向发展。该记录与中国西南地区其他气候代用指标所记录的全新世气候变化具有区域一致性,但在部分时段有明显差异,说明西南地区气候和环境演变即响应了全球性变化又有区域特征。本研究表明,九龙池湖泊沉积物δ<sup>15</sup>N记录可用于揭示研究区域全新世气候与环境变化的特征,是一种具有实用价值的古气候代用记录。;The nitrogen isotope (δ<sup>15</sup>N) of lake sediments plays an important role in indicating climate change in terms of paleoenvironment and palaeoclimate change. However, there is still a lack of in-depth research on the characteristics of climate change indicated by δ<sup>15</sup>N records as a proxy for climate change. This paper took the sediment of Jiulong Wetland in Fanjing Mountain, Guizhou Province, as a research object, and analysed and discussed the process and characteristics of dry and wet climate change in the Fanjing Mountain area recorded by δ<sup>15</sup>N, combined with the data of total organic carbon (TOC), total nitrogen (TN) and carbon-nitrogen ratio (C/N). Finally, a comparative study was carried out, the results showed that: (1) Because the organic matter in the sediment of Jiulong Wetland was mainly from the watershed, when the climate was wet, the soil moisture increased and terrestrial plants grew well, leading to the increased external input on the organic matter to the lake and the negative δ<sup>15</sup>N value of sediment.When the climate was dry, the terrestrial plants and soil moisture decreased, leading to the reduction of the impact of external input on the organic matter in the lake sediments, the δ<sup>15</sup>N value of sediments was positive. (2) The δ<sup>15</sup>N records of the Jiulong Wetland sediments revealed well the Holocene climatic processes (dry/wet changes) in the Fanjing Mountain area. In the early (11.5-9.2 ka B.P.), the Asian summer monsoon was enhanced, and the climate evolved from dry to wet. In the middle (9.2-3.0 ka B.P.), the Asian summer monsoon was strong and the climate was in an overall wet period. In the late period (3.0-2.2 ka B.P.), the Asian summer monsoon weakened and the climate evolved from wet to dry. This record is regionally consistent with Holocene climate change recorded by other climate proxy indicators in southwest China, their differences in some periods indicating significant regional characteristics. This study shows that the sediment δ<sup>15</sup>N record of Jiulong Wetland can be used to reconstruct the characteristics of Holocene climate and environmental changes in the study area, and it is a very useful palaeoclimate proxy record.","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135358840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Characteristic of phytoplankton community structure and its driving factors along the cascade reservoirs in the Lancang River","authors":"Zhang Qi, Yuchen Chen, Yuqing Lin, Qiuwen Chen, Jianyun Zhang, Ding Jue, Honghai Ma","doi":"10.18307/2023.0211","DOIUrl":"https://doi.org/10.18307/2023.0211","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhang Zhiyong, Xiang Lin, Wan Chengyan, Shih‐Yuan Fang, Zhang Daoxi, Zheng Zhiwei, Z. Wen, Xueru Pan, Yuan Yujie, Zhu Liming
{"title":"Evolutionary trend of plant community and adaptive strategies of dominant plants in the water-level-fluctuation zone of the Three Gorges Reservoir","authors":"Zhang Zhiyong, Xiang Lin, Wan Chengyan, Shih‐Yuan Fang, Zhang Daoxi, Zheng Zhiwei, Z. Wen, Xueru Pan, Yuan Yujie, Zhu Liming","doi":"10.18307/2023.0213","DOIUrl":"https://doi.org/10.18307/2023.0213","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Longitudinal variation of channel evolution along the middle Yangtze River after the operation of the Three Gorges Project","authors":"Zhou Meirong, Xia Junqiang, Deng Shanshan, Mao Yu","doi":"10.18307/2023.0220","DOIUrl":"https://doi.org/10.18307/2023.0220","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Scouring effect of the middle and lower reaches of the Yangtze River and its impact after the impoundment of the Three Gorges Project","authors":"Xue Quanxi, Dong Bingjiang, Yuan Jing, Zhu Lingling","doi":"10.18307/2023.0221","DOIUrl":"https://doi.org/10.18307/2023.0221","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhongyong Yang, Yachao Zhang, Zhengyang Tang, Daobin Ji, Cui Yujie, Changwen Li, Jiayang Wu
{"title":"The air-water heat exchange and water vertical stability in the Xiangxi Bay of Three Gorges Reservoir","authors":"Zhongyong Yang, Yachao Zhang, Zhengyang Tang, Daobin Ji, Cui Yujie, Changwen Li, Jiayang Wu","doi":"10.18307/2023.0229","DOIUrl":"https://doi.org/10.18307/2023.0229","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Zhi, Gong Yun, Hu Ting, Zhu Qiguang, Jin Yao, C. Jun, Tang Huiyuan, Xu Wei, Chen Xiaojuan
{"title":"Fish resources of the early life history stages in the Fuling section of the Three Gorges Reservoir and their responses to hydrological and thermal characteristics","authors":"Yang Zhi, Gong Yun, Hu Ting, Zhu Qiguang, Jin Yao, C. Jun, Tang Huiyuan, Xu Wei, Chen Xiaojuan","doi":"10.18307/2023.0233","DOIUrl":"https://doi.org/10.18307/2023.0233","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evolution of fish community structure, cause analysis and implications for ex-situ conservation of Yangtze finless porpoise in Tian-e-Zhou Oxbow of Yangtze River","authors":"Qiu Longhui, Jia Fenfen, Qi Yuhui, Zhang Sanfeng, ShenyangCUI Jianzhong, Gong Cheng, Xu Chunyong","doi":"10.18307/2023.0315","DOIUrl":"https://doi.org/10.18307/2023.0315","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67484293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Millimeter-scale vertical distribution of bacterial groups involved in nitrogen, iron and sulfur cycling and its potential influence on the migration and transformation of nitrogen and phosphorus in sediments of Meiliang Bay, Lake Taihu","authors":"Fan Xianfang, Gao Shuaishuai, Ding Shiming","doi":"10.18307/2023.0309","DOIUrl":"https://doi.org/10.18307/2023.0309","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67484333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liang Dongqing, Ke Senfan, X. Jiawei, Jiao Yilin, Bai Tianxiang, Chen Bixin, Tao Yu, Wang Yongmeng, Shi Xiaotao, Sun Gan
{"title":"Downstream migration of Juvenile fish at Songxin Hydropower Station on the Heishui River, lower reaches of Jinsha River","authors":"Liang Dongqing, Ke Senfan, X. Jiawei, Jiao Yilin, Bai Tianxiang, Chen Bixin, Tao Yu, Wang Yongmeng, Shi Xiaotao, Sun Gan","doi":"10.18307/2023.0318","DOIUrl":"https://doi.org/10.18307/2023.0318","url":null,"abstract":"","PeriodicalId":37454,"journal":{"name":"Hupo Kexue/Journal of Lake Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67485055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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