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分析了黄河水体中悬浮颗粒物(SPM)、溶解硅(DSi)、生物硅(BSi)、植硅体和其他相关参数,旨在揭示自然过程与人为活动对黄河输送硅的影响.结果表明,黄河中溶解硅浓度自1986年以来明显下降;1986~2010年,约有34%的溶解硅因土壤侵蚀的减少而滞留在黄河流域.来源于高等植物的植硅体占河流生物硅的67.2%~96.3%,并以平滑棒形为主要形态.由于含沙量大,黄河生物硅浓度普遍高于世界其他河流,在近黄河口处的利津站位,BSi/(BSi+DSi),BSi/SPM比值分别为0.5和0.003,这表明黄河悬浮颗粒物携带的生物硅是河流输送硅的一个重要组成部分.黄河中相对较高的生物硅含量反映了黄河流域浑浊度与土壤侵蚀程度较高;源自黄土高原巨大的泥沙通量可能是导致黄河中生物硅含量较高的原因,这与世界河流系统生物硅通量随产沙模数增大而增加的趋势相一致.在黄河口外的渤海沉积物中的生物硅也主要由植硅体所构成,平滑棒形同样是其主要的形态.研究表明,由河流输送的生物硅主要由来源于表层土壤侵蚀的植硅体所构成,其也是近岸水域硅生物地球化学循环的重要部分.
Analysis of the suspended particulate matter (SPM), dissolved silica (DSi), biogenic silica (BSi), phytoliths and other related parameters in the Yellow River to reveal the effects of natural processes and anthropogenic activities on the silicon transport in the Yellow River.The results show that the Yellow River The concentration of dissolved silicon decreased significantly from 1986 to 1986, and about 34% of the dissolved silicon remained in the Yellow River basin due to the decrease of soil erosion from 1986 to 2010. The phytoliths from higher plants accounted for 67.2% 96.3%, with smooth rod shape as the main form.Because of the high sediment concentration, the concentration of biogenic silicon in the Yellow River is generally higher than other rivers in the world, and the BSi / (BSi + DSi), BSi / SPM The ratio of 0.5 and 0.003, respectively, indicates that biological silicon carried by the suspended particulate matter in the Yellow River is an important component of silicon transported by the river.The relatively high biogenic silicon content in the Yellow River reflects the high turbidity and soil erosion in the Yellow River Basin. The huge sediment fluxes in the Loess Plateau may contribute to the high biogenic silicon content in the Yellow River, which is consistent with the increasing trend of biosilica flux in the world river systems with increasing sediment yield modulus. The Bohai Sea sediments outside the Yellow River Estuary Creatures in the object It is also mainly composed of phytoliths, and its smooth form is also its main form.Studies show that bio-silicon transported by rivers mainly consists of phyllosilicide derived from topsoil erosion, and it is also a near-shore silicate bio-earth An important part of the chemical cycle.