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| DOI：10.13522/j.cnki.ggps.20180004 |
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| Evaluating Soil Quality of the Cotton Fields in Oasis of Xinjiang Using Different Methods |
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ZHENG Qi, WANG Haijiang, DONG Tianyu, LYU Xin, John A Yunger, RAN Ding, DAI Diwei
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1.College of Agriculture, Shihezi University, Shihezi 832000, China; 2.Biology Department, Governors State University, Chicago 60466, USA
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| Abstract: |
| 【Objective】The purpose of this paper is to compare different methods for evaluating soil quality of the cotton field in Xinjiang.【Method】We collected 1 355 soil samples from different cotton fields in Xinjiang and measured their pH, salinity, clay particle, soil organic matter, total nitrogen, available phosphorus, available potassium, available sulfur, available copper, available zinc, soil heavy metals (total amount of Cr, Cu, Zn, As, Pb), bioavailability of heavy metals (Cr, As, Pb ), Trifluralin , Pendimethalin and plastic film residue. We then analyzed the quality of all soil samples using the fuzzy comprehensive evaluation method (FCE), the internal ROM and weighted comprehensive pollution index method (N-PI), and the integrated soil quality index evaluation method (SQI), respectively. 【Result】The soils in the cotton fields were alkaline and moderately saline, with an average pH of 7.870 and an average salinity of 3.440 g/kg. Organic matter and total nitrogen in all soils were generally low, whereas the available phosphorus, potassium, sulfur, zinc and copper were relatively high. The contents of Cr, Cu, Zn, As and Pb were within the national standard, but there has been an accumulation in Cr, Cu and Zn in all soil samples. The available Cr, As and Pb, as well as Trifluralin residues and Pendimethalin were within the national standard range. Plastic film pollution was a serious concern, with the average residual amount of the film reaching 190.980 kg/hm2. The FCE evaluated the soil quality to be low, and the N-PI method revealed most soils had been moderately polluted. The comprehensive index value of the soil quality was between 0.310 and 0.730, and the comprehensive quality of the soils was generally low. Different evaluation methods could give different results. In this study, SQI appeared to be the most suitable method as it was more objective, scientific and in line with actual soil quality of the cotton fields in Oasis of Xinjiang.【Conclusion】Soil quality in Xinjiang cotton fields is poor. Among all methods used to evaluate the soil quality, the SQI method is the most reasonable, followed by FCE and N-PI method. |
| Key words: cotton field; soil quality; plastic film; evaluation; comparison |
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