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Occasionally, entire batches of mass-produced tile can be defective. But if you do, get ready for pluviaal tapas at Casa Mono or sushi at Morimoto. Some of these clues came from yahko who discovered their gay husbands secret. Likewise, the contents of fsa and sand fraction sa 0. However, the data of fsa and sa in D2 showed a left-tailed distribution tending to high values. The mean proportion of sa was Concerning the low values of CV, the data generally indicate good ability of DFs in controlling the main materials threatening the safety of the Yellow River.
Particle redistribution on the profiles The spatial redistributions of various particle sizes in the D1 profile are presented in figure 2. Obviously, horizontal distributions of fcl and ccl are seen on the profiles. However, the horizontal distributions are not consecutive or equidistant. The intermittent distribution was due to the different rainfall intensity and runoff amount.
Severe rainfall and runoff always carry the particles far away and form long and thick stratification structures.
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The proportion of csi was high, appearing frequently and clearly in horizontal distribution. In general, the distribution trend of the cl and silt fractions si 0. This result indicated similar detachment and deposition characteristics of cl and si in the soil erosion processes.
The patterns in D1 reflected the highest concentrations of cl and si fractions, deposited mainly on the topsoil, on the right side of the DF.
This phenomenon occurred since the fine particles were carried farther away in the deposition process. The distribution of cl and si also had several significant environmental and economic implications. For example, fine particles cl and si were greatly enriched with nutrients and organic matter, which has a strong influence on the soil water-holding capacity and fertility. Consequently, the information on particle size distribution was helpful in the development of precision agriculture for the DFs.
For example, crops with greater nutrient and water requirement could be planted on areas where fine particles are accumulated.
Sediment loss in semiarid small watershed due to the land use
The dominant fraction in D1 is fsa. The horizontal distribution of these particles was also observed along the profile, but finer particles were predominant. However, the stratification trend was vague in view of the high proportion and low variability in the profile. For the csa, the lower proportion clarified the stratification again. This kind of particles was mainly found in the deep soil layers and rarely on the slope, especially on the surface soil on the right side.
This phenomenon was also strongly related to the deposition process, where coarse particles are deposited first and then fine particles, which were transported farther.
A high sa content was distributed along the D1 profiles. Obviously, a relatively higher sa proportion was deposited on the left side and in the middle part of D1. In the dataset, the sample with the highest sa content i. This was also related to the deposition rule of different particles in a redistribution process. In D2, the spatial patterns of various particles in the different profiles were similar to D1 shown in Figure 3. Due to the short deposition period and thin deposition layer in D2, the stratification structure did not appear as frequently as in D1.
However, sa becomes more predominant, as shown in table 1 and figure 3. In general, the spatial patterns of various particle sizes in the DFs were mainly related to the deposition characteristics of particles.
In the runoff process, the particles covered the former topsoil with different amount and particle sizes, over and over again.
Consequently, particle stratification was clearly existent in the DF profiles since the particles were deposited at different times. The horizontal distribution of particle sizes controlled the appearance of the soil layers. The occurrence of preferential flow, which may transport chemicals or contaminant materials into the groundwater quickly, was mainly influenced by the layered soils of the DF Zhao et al. The finding of stratification in the DFs agreed with the results of Boll et al.
Enrichment ratio of particles To identify the most erodible particle-size group in this region, the enrichment ratio ER of various particles in the two DFs was compared Figure 4.
In this study, the ER value was calculated by the mean proportion of various particles in the DF, by dividing the proportions of particles collected from controlled sloping areas. For a more specific range, a more detailed classification than the Chinese taxonomy was applied see x-axes of Figure 4.
In D1, the range of 0. The same result was found in D2. This means that the 0. This result contradicted the study of Youngwho found that 0. This can be explained by the fact that soil erosion and soil loss were mainly associated with heavy rains on the CLP, and the eroded soil was sandy loam with high sa contents, as explained by Hu et al.
Consequently, the various eroded environments and materials, and mainly rainfall intensity and soil texture, would determine the most erodible particle-size group.
This implies that these fractions were easily detached in the soil erosion process. Soils with very high sa are not well-aggregated and thus tend to erode before the other particles. The results illustrated that the fine particles i. However, Ampontuah et al.
From the results of this research, the characteristics of the high silt content were relatively stable with regard to the water erosion on the CLP. For the fraction 0. As a consequence, this range has a lower ER than the fractions of 0. As it is well-known, the content of soil organic C has a positive linear relationship with the value of fine particles e. Despite the higher sand fraction, more carbon was captured in the DF than in sloping areas under no tillage.
Consequently, the DF on the CLP contribute greatly to carbon sequestration, due to the large scope and long time of this soil conservation practice. Correlation analysis between soil water content and particle-size groups The particle size has a great effect on soil water distribution and movement Zhao et al. The relationship between the particles and the volumetric soil water content was analyzed by SPSS The soil water contents were assessed on different dates by a neutron probe to represent wet and dry conditions Zhao et al.
Table 3 shows Pearson's correlation coefficients between soil water content and various particles of D1 for several random days. All particles size groups were significantly related with soil water content. Due to the large pore structure, the low soil water content is more significantly related with cas in the DF.
This result indicates the trend of most particle size groups to show low correction with the soil water content, except for the csa fraction, which tends to be more prevalent with soil water content in the DF. The range of 0. Generally, disregarding their significance level, cl and si were positively and sa negatively correlated with soil water content.
However, no relationship was found between particle-size group and soil water content for D2 in this study. This could be explained by deposition effects, leading to the retention of great amounts of shallow groundwater by the dam body, as well as to the presence of air and water in the pores. This air affects the relationship between particles and soil water content negatively. This study reported a layered structure of various particle-size groups in the profiles of deposited farmland soil.