科研之友
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摘要
The current comprehensive soil quality evaluation is highly dependent on sample selection for evaluation sensitivity，the evaluation results are not comprehensive enough，and the selection of fertility index is rather subjective，leading to limited applications. Therefore，the improved soil quality index method（I-SQI）was proposed by introducing the dynamic weighted assessment method based on the existing comprehensive soil quality evaluation method. The comparative analysis of I-SQI with the improved Nemerow pollution index method（I-NPI）and technique for order preference by similarity to an ideal solution（TOPSIS）of the current method was carried out by example，and it was found that I-SQI could show better applicability to soils with different conditions，and the evaluation results were comprehensive and sensitive，which effectively solved the problems of the current method. Applying this method to the comprehensive evaluation of farmland soils around Nandan mine in Guangxi，it was found that ① soil fertility in the study area was at an intermediate level or below，and the six indicators of exchangeable calcium，clay particles，conductivity，total nitrogen，available potassium，and bulk density were the key indicators affecting the fertility of farmland soils in the study area；② most of the farmland in the study area had heavy metal pollution，As，Cd，Pb and Zn were the main pollution factors affecting the soil environmental quality in the mining area；③ the soil quality of farmland in the study area was mainly failing and passing，which needed to be improved urgently. This study provides a new stepping stone for the development of comprehensive soil quality evaluation. ? 2023 Science Press.
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