Moreover, B. cereus sl occurrence has been widely reported in a broad range of environments, such as many types of soils, sediments, dust, and plants (see [ 8– 15, 15] for reviews).
So, they could identify any changes in precipitation by the proportion of dust grains to sediment grains more airborne dust means less precipitation, whereas more runoff grains mean more rain.
Several studies have reported the soaring levels of toxic heavy metals and organic contaminants in samples of dust, soil, river sediment, surface water, and groundwater of Guiyu (Brigden et al. 2005; Puckett et al. 2002; Wang and Guo 2006; Wang et al. 2005; Wong et al. 2006; Yu et al. 2006).
However, the magnetic properties of sediments from key dust sources have not been well determined.
To better decipher the dust signal preserved in sedimentary archives, it is necessary not only to understand the magnetic properties of terrestrial and marine sediments in depositional sinks to obtain high-resolution records of dust flux from key source regions, but there is also a need to study the magnetic properties of dust material from different sources to their depositional sinks.
Understanding the relationship between horizontal flux and the vertical component of sediment and dust is critical to predicting fundamental processes such as erosion, and to assessing human and environmental risks associated with contaminated sediment and dust.
Among the different influencing factors of dust storm emergence, such as gust, sediment supply, and ground roughness, the condition of the vegetation is just one factor determining the frequency of dust storms (Fan et al. 2014).
However, the characteristics of the pure dust materials and the rates of dust-fall in the past are unclear because of the low overall rate of dust deposition and mixing with locally derived sediments.
Records of dust can be obtained from ice cores, marine sediments, and terrestrial (loess) deposits.
Natural processes will supply nutrients to a lake in solution in river water and rainwater, in the fallout of dust from the atmosphere, and in association with the sediments washed into the lake.
