ارزیابی کمی کیفت خاک در کاربری های مختلف در بخشی از اراضی جنوب شرق قزوین

نوع مقاله: مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی دانشگاه تهران

2 دانشجوی دانشگاه تهران

3 فارغالتحصیل کارشنی ارشد دانشگاه تهران

چکیده

یکی از ابزارهای مفید برای بررسی وضعیت مدیریت خاک در کاربری­های مختلف، ارزیابی کیفیت خاک است و استفاده از شاخص­های کمی، یکی از مناسب­ترین روش­های تعیین و مقایسه کیفیت خاک­ها می­باشد. در این تحقیق شاخص­ها و روش­های انتخاب ویژگی­های مؤثر برای ارزیابی کیفیت خاک در کاربری­های مختلف مورد مقایسه قرار گرفتند. 17 ویژگی فیزیکی، شیمیایی و زیستی خاک در پنج کاربری باغ، مرتع، زراعت آبی، زراعت دیم و اراضی رها شده در سه کلاس شیب کمتر از 2، 7-5 و 11-9 درصد، در جنوب شرق قزوین به عنوان مجموعه کل داده­ها  Total Data Set)) انتخاب شدند. سپس با استفاده از روش تجزیه مؤلفه­های اصلی (Principle Component Analysis)، هفت ویژگی به عنوان دسته داده­های حداقل (Minimum data set) انتخاب شدند. با استفاده از دو شاخص کیفیت تجمعی (Integrated quality index) و شاخص کیفیت نمرو (Nemero quality index) در این دو مجموعه داده، کیفیت خاک ارزیابی شد. نتایج نشان داد که کاربری­های باغ و مرتع به ترتیب بیشترین مقدار شاخص­ کیفیت تجمعی و شاخص کیفیت نمرو را دارنداما کاربری­های زراعت آبی، زراعت دیم و اراضی رها شده دارای کمترین کیفیت خاک هستند و تفاوت معنی­داری با دو کاربری باغ و مرتع دارند. ضریب تبیین بین دو مجموعه داده برای شاخص کیفیت تجمعی و شاخص کیفیت نمرو به ترتیب برابر 95/0 و 88/0 است که بیانگر قابل اطمینان بودن استفاده از دسته داده­های حداقل به جای مجموعه کل داده­ها و همچنین کارائی بهتر شاخص کیفیت تجمعی برای ارزیابی کیفیت خاک منطقه مورد مطالعه است.

کلیدواژه‌ها


عنوان مقاله [English]

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

نویسندگان [English]

  • Manoochehr Gorji 1
  • Jalil Kakeh 2
  • Alireza AliMohammadi 3
1 University of Tehran
2 University of Tehran
3 University of Tehran
چکیده [English]

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.

کلیدواژه‌ها [English]

  • "Integrated quality index"
  • "Nemero quality index"
  • "Total data set"
  • "Minimum data set"
  • "land uses"
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