Quantitative soil quality assessment in different land uses at some Parts of south eastern of Qazvin

Document Type : Research Paper


University of Tehran


The assessment of soil quality is one of the most useful methods to evaluate soil management conditions and different uses of land. The determination and comparison of quantity indices is one of the best ways to compare the quality of different soils. In this study, soil quality indices and selection methods were compared to evaluate the soil quality effectively for various land uses. In this paper, seventeen properties of soil including the physical, chemical and biological properties were selected as total data sets (TDS) at five different land uses including orchard, rangeland, irrigated farming, dry land farming and unutilized lands in slope classes of 0-2%, 5-7% and 9-11% at some parts of south eastern Qazvin province,Iran. Then, 7 properties were selected as Minimum Data Set (MDS) using Principle Component Analysis (PCA). The soil quality was evaluated by Integrated Quality Index (IQI) and Nemero Quality Index (NQI) in two sets of soil properties including MDS and TDS. The results from the research showed that orchard and rangeland hadthe highest IQI and NQI in both data sets, respectively. However, irrigated farming, dry land farming and unutilized lands have the least IQI and NQI in both data sets respectively, and they have significant difference compared to orchard and rangeland. The correlation coefficients between TDS and MDS were 0.95 and 0.88 for IQI and NQI, respectively. These coefficients indicate the higher reliability of MDS against TDS, and also they show that the IQI offers better results to evaluate the soil quality in this case study.


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