ISWC OpenIR  > 水保所知识产出(1956---)
胡亚鲜1,2; Nikolaus J. Kuhn33
Source Publication土壤学报

土,红壤的机械组成显示,有86.9%的有机碳与≤32 μm的矿物颗粒相结合,很有可能随悬移过程汇入
下游水体。但土壤颗粒沉降速度分布表明,约有90.5%的红壤有机碳与等效石英粒径≥63 μm的团聚体

Other Abstract

【Objective】Knowledge about thet ransport patterns of sediment helps to understand
the erosion-induced biogeochemical processes of C,N and P. The sediment transport distance is closely
associated with its settling velocity distribution,which is dependent on the size,shape,density and porosity
of sediment particles. In fact,aggregation processes turn fine particles into large aggregates,speeding up
the settling velocity of individual particles and shortening their transport distances. However,most of the soil
erosion models currently available are using soil texture or mineral particle distribution,therefore cannot
fully reflect the transport behavior of sediment particles.【Method】Two typical types of soils in China,
red soil(Hapli-Udic Ferrosols)and loess soil(Loessi-OrthicPrimosols),were investigated in this study.
The two soils had similar texture,but were distinctive in aggregate stability and soil organic carbon content.
They were,therefore,considered as suitable objects in this study to explore the potential differences
between settling velocity distribution and mineral size distribution. The two soils were fractionated by two
methods:conventional wet-sieving into mineral size distribution;and settling tube fractionation into settling
velocity distribution. The weight distribution,total organic carbon concentration and total inorganic carbon
concentration of individual classes were measured and compared. 【Result】Results show that,compared
with the conventional soil mineral size distribution,fractionation using settling tube is more effective in
distinguishing the settling velocity distributions of red soiland loess soil. This is because clay-sized particles
are more likely to be cooperated into aggregates,which facilitate the settling velocity of individual mineral
particles,and thus largely shorten their potential transport distance. In particular in the better aggregated red
soil,about 86.9% of the soil organic carbon was associated with fine particles ≤32 μm,which is very likely
to stay as suspension and thus transported downstream once erosion occurs. However,as a matter of fact,
about 90.5% of the soil organic carbon was combined with coarse aggregates of equivalent quartz size ≥63
μm,which would probably be deposited at the footslope immediately after short transport distance. Similar
patterns of soil inorganic carbon distributions were observed in the loess soil. All the findings demonstrate
that aggregation effects can effectively shorten the transport distance of soil organic and inorganic carbon and
skew their distributions towards the terrestrial system than if otherwise predicted by mineral size distributions.
【Conclusion】Settling velocity specific redistribution of sediment particles casts new light on our current
understanding of C,N and P biogeochemical processes during soil erosion and sediment transport and
deposition. Therefore,settling velocity specific distribution of sediment particle should be considered as a
soil erodibility parameter to be applied to soil erosion models .

Keyword沉降管法 沉降速度 团聚体 迁移距离 有机碳 无机碳
Indexed By中文核心期刊要目总览
Document Type期刊论文
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
胡亚鲜,Nikolaus J. Kuhn3. 利用土壤颗粒的沉降粒级研究泥沙的迁移与分布规律*[J]. 土壤学报,2017,54(5):1115-1124.
APA 胡亚鲜,&Nikolaus J. Kuhn3.(2017).利用土壤颗粒的沉降粒级研究泥沙的迁移与分布规律*.土壤学报,54(5),1115-1124.
MLA 胡亚鲜,et al."利用土壤颗粒的沉降粒级研究泥沙的迁移与分布规律*".土壤学报 54.5(2017):1115-1124.
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利用土壤颗粒的沉降粒级研究泥沙的迁移与分(1918KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Download
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