Sedimentary chronology reinterpreted from Changshou Lake of the Three Gorges Reservoir Area reveals natural and anthropogenic controls on sediment production
Sedimentary chronology reinterpreted from Changshou Lake of the Three Gorges Reservoir Area reveals natural and anthropogenic controls on sediment production
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三峡库区长寿湖沉积年代学的重新解释揭示了自然和人为对沉积物产生的控制
DOI：
10.1007/s11356-018-1916-3
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发表时间：
2018-04
影响因子：
5.8
通讯作者：
韦杰
中科院分区：
文献类型：
--
作者：
Raheel Anjum;唐强;Adrian L. Collins;高进长;龙翼;张信宝;贺秀斌;史忠林;文安邦;韦杰
保存在地貌汇中的沉积档案提供了历史沉积动力学及其相关的自然和人为控制的记录。通过结合降雨侵蚀力指数和多种示踪因子，重新解释了三峡库区长寿湖的沉积过程，并探讨了自然和人为驱动因子对沉积物产生的影响。雨季发生频率低、强度大的侵蚀产沙事件在年降雨总量中占有相当大的比例，可以用来推断侵蚀产沙事件。通过比较降雨侵蚀力指数与137 Cs深度分布和绝对颗粒大小，确定了沉积年代，显示年沉积速率为1.1至2.3 cm a−1。多代理测年指数和沉积速率变化将沉积剖面划分为三个主要时期。参考期（1956-1982年）显示TOC，TN，微量金属浓度和平均沉降速率的低变异性。在胁迫期（1982-1998年），工业和污水排放导致TOC、TN和痕量金属（例如，Cd、Co、Cu、Cr和Ni）。最高的年泥沙积累速率为2.3 cm a-1，可能是1982年大洪水事件造成的。在本阶段（1998-2013年），增加TOC，TN和减少微量金属沉积物芯的顶层表明湖泊生态的变化。直到2004-2005年，养鱼促进了藻类生长和初级生产力，导致富营养化。1998 - 2004年及以后的平均沉积速率降低了1.7 cm a-1，这可能是由于陇西流域实施了水土保持和植树造林政策。自1989年以来，人类活动，如森林砍伐，文化和工业革命，以及湖泊富营养化与渔业养殖，因此导致了可观的湖沼变化。总的来说，长寿湖的沉积剖面显示出与历史事件的高度一致性，反映了自然和人为控制对沉积物产生的影响。
Sedimentary archives preserved in geomorphic sinks provide records of historical sediment dynamics and its related natural and anthropogenic controls. This study reinterpreted sedimentary processes in Changshou Lake of the Three Gorges Reservoir Area in China by combining a rainfall erosivity index with multiple tracing proxies, and the impacts of natural and anthropogenic drivers on sediment production were also explored. Erosive rainfalls with low frequency and large magnitude in the rainy season contribute to a substantial proportion of annual total rainfall, which thus can be used to infer erosion and sediment yield events. The sedimentary chronology was determined by comparing rainfall erosivity index with depth distribution of137Cs and absolute particle size, which revealed annual sedimentation rates ranging from 1.1 to 2.3 cm a−1. The multi-proxy dating index and variation of sedimentation rate divided the sediment profile into three major periods. The reference period (1956–1982) displays low variability of TOC, TN, trace metal concentrations, and mean sedimentation rate. In the stressed period (1982–1998), industrial and sewerage discharge led to input and deposition of TOC, TN, and trace metals (e.g., Cd, Co, Cu, Cr, and Ni). The highest annual sediment accumulation rate of 2.3 cm a−1may be ascribed to the 1982 big flood event. In the present period (1998–2013), increased TOC, TN and decreased trace metals in the top layers of the sediment core indicated changes in lake ecology. Fish farming promoted algal growth and primary productivity which caused eutrophication until 2004–2005. The reduced mean sedimentation rate of 1.7 cm a−1between 1998 and 2004, and thereafter, may be attributed to soil and water conservation and reforestation policies implemented in the Longxi catchment. Human activities such as deforestation, cultural and industrial revolution, and lake eutrophication associated with fish farming since 1989, therefore led to appreciable limnological variations. Overall, the dated sedimentary profile from Changshou Lake displays high consistency with archived historical events and reflects the impact of both natural and anthropogenic controls on sediment production.
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DOI：
10.1007/s00477-006-0036-7
发表时间：
2006-02
影响因子：
4.2
作者：
S. Becker;M. Gemmer;T. Jiang
通讯作者：
S. Becker;M. Gemmer;T. Jiang
影响因子：
2.1
作者：
F. García-Rodríguez;C. Anderson;J. B. Adams
通讯作者：
F. García-Rodríguez;C. Anderson;J. B. Adams
中国长江中下游地区湖泊近期环境变化的一些沉积物地球化学证据
影响因子：
2.2
作者：
Xue, Bin;Yao, Shuchun;Xia, Weilan;Zhu, Yuxin
通讯作者：
Zhu, Yuxin
影响因子：
3.4
作者：
Erkossa, T.;Wudneh, A.;Taye, G.
通讯作者：
Taye, G.
DOI：
--
发表时间：
2011-07
期刊：
Huan jing ke xue= Huanjing kexue
影响因子：
--
作者：
Haifeng Guo;Jin-zhong Zhang;Shi-qiang Wei;D. Xie;Jian-Cheng Che
通讯作者：
Haifeng Guo;Jin-zhong Zhang;Shi-qiang Wei;D. Xie;Jian-Cheng Che