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High resolution magnetic survey around Meishan steel mill in Nanjing (SE China) was carried out after a preliminary magnetic study which proved that paddy soil could be a suitable target for environmental study on heavy metal pollution. Magnetic susceptibilities were measured on the surface and along down holes at 100 soil sites around Meishan steel mill. In vertical profiles, geochemical and magnetic...
The objective of this study was to investigate influences of microbial Fe(III) reduction on biogeochemical transformations of different heavy metals in flooded paddy soil. Anaerobic slurry incubation was adopted with amendment of Cr(VI), As(V) and Cu(II) at different concentrations levels, respectively. Results showed that Cr(VI) was reduced to Cr(III) by Fe(II) which was the product of microbial...
GC-ECD was used to analyze twelve kinds of organochlorine pesticides in the paddy soil in Jiangxi Province, China. The result shows that the organochlorine pesticides range from 0.006 mg/Kg to 0.702 mg/Kg and the average is 0.186mg/Kg. Besides, the higher concentration component is BHCs, DDTs and chlordane. The residual level is different among the regions in Jiangxi Province and, Xinyu, Yichun and...
Based on the data of Arsenic in paddy soil and rice around Poyang Lake, the geostatistical data interpolation and correlation analysis were used to indicate the spatial distribution characteristics and correlation between Arsenic in rice and paddy soil, as well as analysis of causes were discussed. The results show, all the samples are in a low concentration of Arsenic which is less than background...
By detecting the nutrient elements contents in soil for monitoring the rice growth and conditions of nutrients, a month after fertilization N, P, K and no fertilization in paddy soil have been analyzed by laser induced breakdown spectroscopy (LIBS) technique, which is using a Nd: YAG ns laser at 1064 nm and an eight-channel AvaSpec spectrometer with CCD detector. The characteristic spectra and the...
Rice (Oryza sativa L.) cultivation is due to special conditions of land preparation affect on physical characteristics such as soil bulk density, surface aggregates dispersion, infiltration rate and compaction. The study area is located at Lenjan, in Isfahan province, in the center of Iran, soil physical properties of rice cultivation, wheat cultivation (Triticum aestivum L.) and rice-wheat rotation...
The walking procedure of the cattle on a paddy field before spring plowing was captured by the high-speed photography. The properties of the paddy soil used for tests and the geometrical configurations of the hooves of the cattle were examined. Combined with the fitted curve, the graphs of joint angle were drawn. The changes of the joint angles and the orientations of all limbs were analyzed, and...
This study is supported by the agriculture geochemical survey project in Dakang town, Jiangyou city. This paper studies the characteristics of heavy metal pollution in soil and then evaluates heavy metal potentialities in purple soil and paddy soil by adopting the potential ecological risk index(PERI) proposed by Hakanson. In purple soil, the data show that Hg, Cd, and Cu are the top three heavy metals...
An exploratory study on sediment and soil contamination of heavy metals was carried out along Dalian coastal regions in Liaoning province, China. Estuarine intertidal sediment samples and their adjacent upland and paddy soil samples were analyzed by atomic absorption spectrophotometry for Zn, Cu, Pb and Cr. The contamination of the sediments and soils was assessed on the basis of enrichment factor...
The AnnAGNPS model (Annualized Non-Point Source Pollution Model) is applied to analyze the spatial and temporal heterogeneity of agricultural non-point source pollutant loading in Zhangxi Watershed. The spatial database and attribute database of non-point source pollution is then established. Our result shows that in spatial scale, absorbed nitrogen has great spatial heterogeneity, while dissolved...
Different methods were applied to recent soil survey data to estimate background concentration of zinc in paddy soils in central Anhui Province, China. Results with quite high consistency were obtained and a background concentration of 66.1 mg kg-1 was accepted and used for calculating zinc surplus in soils and thereafter for identifying areas with high anthropogenic zinc input. Spatial characteristics...
Through incubation of one kind of paddy soil with different concentration of phenanthrene, the paper discusses the change of contents and its effect on enzyme activity in the paddy soil. The result indicated that contents of phenanthrene added to soil decreased gradually with incubation day. After incubation for 56d, the content of phenanthrene with high concentration (1.6 and 3.2μg/g ) declined more,...
The walking procedure of the cattle, Bostaurus, on a paddy field before spring plowing was captured with a high-speed video camera. The properties of the paddy soil used for tests and the geometrical configurations of the hooves of the cattle were examined. The geometrical configurations and motion postures of the cattle during walking on paddy field were analyzed, and the gait parameters were gained...
Specific location of extracellular enzymes within the soil matrix was related to soil organic matter (SOM) quality and carbon turnover. A physical fractionation procedure was used to investigate whether soil carbon was spatially isolated from degradative enzymes in a paddy soil. In POM fractions of this study, high C concentrations are found because they are derived from inputs of recent plant materials...
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