Variability in the composition and export of silica in the Huanghe River Basin
Variability in the composition and export of silica in the Huanghe River Basin
复制标题
黄河流域二氧化硅成分及输出变化
DOI：
10.1007/s11430-015-5064-z
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发表时间：
2015-05
影响因子：
5.7
通讯作者：
Zheng LiLi
中科院分区：
文献类型：
--
作者：
Ran XiangBin;Che Hong;Zang JiaYe;Yu YongGui;Liu Sen;Zheng LiLi
通过对黄河口悬浮颗粒物（SPM）、溶解硅酸盐（DSi）、生物硅（BSi）、植硅体（植物产生的硅质显微结构）等参数的分析，研究了自然过程和人类活动对黄河口硅输出的影响。我们的研究结果表明，自1986年以来，DSi在河流中的浓度显着下降。在1986年至2010年期间，由于土壤侵蚀的减少，大约34%的溶解二氧化硅被困在盆地中。植硅体占BSi的67.2%~ 96.3%，以平滑条型为主。与世界其他主要河流相比，由于其高产沙量，黄河中BSi的浓度显着较高。在黄河口附近的李泾，BSi/（BSi+DSi）和BSi/SPM的比值分别约为0.5和0.003，表明黄河携带的悬浮态BSi是黄河硅负荷的重要组成部分。黄河口附近渤海沉积物中的植硅体也含有大量的BSi，其中又以光滑的沙洲形式最为丰富。黄河水体中BSi较高的比通量反映了该流域的高浊度和高侵蚀速率。黄土高原的高泥沙负荷可能是负责较高的BSi通量，在全球河流系统中增加BSi通量增加泥沙通量的总趋势一致。这项研究表明，河流输送的BSi可以主要由植硅体来源于表土的侵蚀。因此，植硅体在河流悬浮泥沙中的通量可能对沿岸沃茨二氧化硅的地球化学循环有重要贡献。
Concentrations of suspended particle material (SPM), dissolved silicate (DSi), biogenic silica (BSi), phytoliths (plant produced siliceous microscopic structures), and other parameters were analyzed to examine the influence of both natural processes and human activities on silica delivery to the estuary of the Huanghe River (Yellow River). Our results indicate that the concentrations of DSi in the river decreased significantly since 1986. Approximately 34% of dissolved silica was trapped in the basin between 1986 and 2010 due to a reduction of soil erosion. Phytoliths comprised 67.2%–96.3% of BSi, with the smoothing bar type being the dominant form. Concentrations of BSi are significantly higher in the Huanghe River compared to other major rivers throughout the world due to its high sediment yield. We also found that the ratios of BSi/(BSi+DSi) and BSi/SPM were approximately 0.5 and 0.003 at Lijing near the river mouth, indicating that BSi carried in suspension by the Huanghe River was an important component of the rivers silica load. Significant amounts of BSi were also composed of phytoliths in Bohai Sea sediments near the Huanghe River estuary with the smoothing bar form again being the most abundant. The relatively high specific fluxes of BSi in the Huanghe River reflect its high turbidity and high erosion rates in the basin. The high sediment load originating on the Loess Plateau is likely responsible for the higher BSi flux, in agreement with a general trend of increasing BSi flux with increasing sediment flux in global river systems. This study demonstrates that BSi transported by rivers can be composed largely of phytoliths originating from the erosion of topsoils. The flux of phytoliths in river’s suspended sediment load may therefore represent a significant contribution to the biogeochemical cycle of silica in coastal waters.
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影响因子：
2.8
作者：
ANDERSON, GF
通讯作者：
ANDERSON, GF
DOI：
--
发表时间：
1999
期刊：
--
影响因子：
--
作者：
K. Lajtha;W. Jarrell;D. Jonson;P. Sollins;G. Robertson;D. Coleman;C. Bledsoe
通讯作者：
K. Lajtha;W. Jarrell;D. Jonson;P. Sollins;G. Robertson;D. Coleman;C. Bledsoe
影响因子：
4.5
作者：
Conley, DJ
通讯作者：
Conley, DJ
影响因子：
1.4
作者：
Na Liu;Lina Lin;Yingjie Wang;Hongxia Chen;Yan He
通讯作者：
Na Liu;Lina Lin;Yingjie Wang;Hongxia Chen;Yan He
DOI：
10.1177/095968369200200217
发表时间：
1992-07
期刊：
The Holocene
影响因子：
--
作者：
G. Shimmield
通讯作者：
G. Shimmield