| Autor: |
Zhou YL; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Guo ZJ; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Liu F; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Hang W; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Kong M; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Zhao CD; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Liu AT; Geological Survey Institution of Hebei Province, Shijiazhuang 050081, China., Peng M; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Wang QL; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China., Wang CW; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China.; Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China.; Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China. |
| Abstrakt: |
In order to evaluate the land quality geochemical survey achievement in the service of the accurate management of urban land resources, the initial area of the Xiong'an New District as urbanization pathfinder in China is chosen as the research subject. The sample points were set by differential classification, and the spatial interpolation accuracy of the soil elements at a plot scale and a quantitative assessment of the consistency of the land plot (pattern spot) prediction evaluation were studied under the conditions of different sampling densities. The regional geochemical variation values randomly distributed on the plane can be reflected quantitatively by differential classification sampling, which can meet the basic demand of the quality attribute of a single plot (map spot) by the accurate management of urban land resources. The spatial variability of soil elements is mostly middle to moderate, and Cd, Cu, Pb, Hg, Se, N, P, and other elements of high spatial variability are affected by human industrial and agricultural production activities. Under the same sampling density, the larger the element variation coefficient, the worse the spatial interpolation accuracy. Although the interpolation accuracy of the same element index is affected by the sampling density, the increase in the sampling density could not identify the continuous component on the structure of the soil element content. The soil environment is clean, and the heavy metal content is lower than the GB15618-2018 standard. The interpolation results are basically consistent with the grading results of the measured values, while the contents of N, P, and K of the nutrient indices vary greatly, and the predicted and measured geochemical grades of the plots (map spot) differ substantially under the influence of factors such as human disturbance and spatial variability. The quantitative evaluation of the six different sampling densities indicates that the 16 points·km -2 sampling density adopted in the geochemical survey and evaluation of urban land quality can satisfy the needs of an accurate control of urban land resources in the study area and similar areas. The research can provide key technologies to support and serve the accurate management of urban land resources for geochemical surveys and the evaluation of land quality in land parcel scale cities. |
