ارزیابی تعیین مجموعه حداقل داده ها برای ارزیابی کیفیت خاکهای شور - سدیمی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 علوم خاک دانشگاه زنجان

2 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه ارومیه

3 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه زنجان

4 دانشیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه زنجان

10.30466/asr.2026.56064.1880

چکیده

ارزیابی کیفیت خاک برای بررسی قابلیت تولیدی اراضی حائز اهمیت است. لذا در جهت نیل به این هدف روش‌های گوناگونی پیشنهاد گردیده است. لکن بدلیل تعدد زیاد داده‌ها، وجود روشی که بتواند با بررسی تعداد داده کمتر هدف مورد نظر را تبیین نماید، از دیرباز مطرح بوده است. استفاده از حداقل مجموعه داده‌ها (MDS) یکی از روش‌های فوق است. در این تحقیق 24 ویژگی مختلف شامل فیزیکی، شیمیایی و فلزهای سنگین متعلق به 80 نمونه خاک از اراضی شور – سدیمی حاشیه دریاچه ارومیه جهت تعیین محموعه حداقل داده‌ها توسط روش تجزیه به مولفه‌های اصلی (PCA) مورد تجزیه و تحلیل قرار گرفت. نتایج نشان داد که 8 ویژگی دارای ارزش ویژه بیش از یک بودند. این ویژگی‌ها که بعنوان مجموعه حداقل داده  انتخاب شدند، شامل هدایت الکتریکی، کربن آلی، سرب کل، جرم مخصوص ظاهری، درصد سیلت و رس، کادمیم کل و کربنات کلسیم معادل بودند و بیش از 78 درصد از واریانس کل را تشریح کردند. از میان این شاخص‌ها کمترین وزن مربوط به سرب و کادمیوم بود که بیان کننده تاثیر کمتر عناصر فوق در تعیین شاخص کیفیت خاک و بالاترین وزن نیز مربوط به کربن آلی و درصد رس بود که نشان دهنده تاثیر بالای آنها در تعیین شاخص کیفیت خاک محدوده مورد پژوهش است. ضریب تبیین بین دو مجموعه داده‌های TDS و MDS برای مدل‌های خطی و غیرخطی 54/0 و 64/0 بود که بیانگر قابل اطمینان بودن استفاده از مجموعه داده‌های حداقل به جای مجموعه کل داده‌ها و کارائی بهتر مدل غیرخطی برای ارزیابی کیفیت خاک منطقه مورد مطالعه بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluating the minimum data set determination to assess saline-sodic soil quality

نویسندگان [English]

  • hossein rezazadeh 1
  • salar rezapour 2
  • parisa alamdari 3
  • Mohammad Sadegh Askari 4
1 soil scince zanjan university
2 Department of Soil Science and Engineering, Faculty of Agriculture, University of Urmia
3 Department of Soil Science and Engineering, Faculty of Agriculture, University of Zanjan
4 Assistant Professor, Department of Soil Science, Faculty of Agriculture, University of Zanjan
چکیده [English]

Soil quality assessment is very important for studying the condition of all lands. Therefore, numerous methods have been proposed to achieve this objective. However, given the vast amount of data involved, there has long been a need for an approach that can effectively explain the desired outcome using a smaller dataset. The use of minimum data sets (MDS) is one of these methods. In this study, 24 different soil attributes, including physical, chemical, and heavy element properties, were analyzed in 80 soil samples from saline-sodic soils on the margins of Lake Urmia to determine the MDS approach using principal component analysis (PCA). The results revealed that eight indicators had eigenvalues greater than one. These indicators, identified as the MDS, were soil electrical conductivity, organic carbon, total Pb, bulk density, silt and clay, total Cd, and calcium carbonate equivalent, and together they accounted for over 78% of the total variance. Among the eight indicators, Pb and Cd had the lowest weights, suggesting the least influence on the soil quality index. Conversely, organic carbon and clay had the highest weights, highlighting their key role in determining the soil quality index for the study region. The coefficients of determination (R²) between the TDS and MDS datasets were 0.54 for the linear model and 0.64 for the nonlinear model, indicating that the MDS can reliably replace the TDS for soil quality assessment. Additionally, the higher R² value of the nonlinear model suggests its greater efficiency in evaluating soil quality in the study area.

کلیدواژه‌ها [English]

  • Saline-Soil Soil
  • Heavy Metals
  • Soil Quality Index
  • Total Data Set
  • Minimum Data Set
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