کاربرد اطلاعات تشریح خاک‌رخ در برآورد کربن آلی خاک با استفاده از توابع انتقالی خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

موسسه تحقیقات خاک و آب، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج، ایران

چکیده

کربن آلی خاک یکی از مهم‌ترین ویژگی‌های خاک بویژه از دیدگاه محیط زیستی می‌باشد. به همین دلیل مدل‌سازی و برآورد آن بسیار مد نظر قرار گرفته است. در مدل‌سازی‌ها، استفاده از توابع انتقالی خاک به عنوان رویکردی برای برآورد ویژگی‌های خاک با استفاده از داده‌های زودیافت از جایگاه مهمی در علوم خاک برخوردار می‌باشد. اما متأسفانه در این راستا به داده‌های ارزشمندی که با کمترین هزینه و زمان در عملیات تشریح خاک‌رخ به دست می‌آیند توجه چندانی نشده است. هدف از پژوهش کنونی تعیین اهمیت اطلاعات تشریح خاک‌رخ در برآورد کربن آلی خاک با استفاده از توابع انتقالی می‌باشد. برای این منظور، 124 نمونه خاک گردآروی گردید. فرآیند مدل‌سازی در سه حالت مختلف شامل داده‌های آزمایشگاهی، داده‌های تشریح خاک‌رخ و تلفیق داده‌های آزمایشگاهی و تشریح خاک‌رخ انجام شد. نتایج نشان دادند براساس داده‌های آزمایشگاهی، کربن آلی خاک با دو ویژگی درصد سیلت و کربنات کلسیم خاک با ضریب تبیین حدود 25 درصد (25/0=2R) رابطه معنی‌دار دارد. در حالی که دو ویژگی کروما و عمق افق ژنتیکی با ضریب تبیین حدود 65 درصد (65/0=2R) قادر به برآورد مقدار کربن آلی خاک هستند. در حالت تلفیق داده‌های آزمایشگاهی و تشریح خاک‌رخ، ضریب تبیین همچنان برابر با 65 درصد به‌دست آمد. این نتایج گویای آن است که در حضور دو ویژگی عمق افق ژنتیکی و رنگ خاک، داده‌های آزمایشگاهی اثر معنی‌داری در برآورد کربن آلی خاک ندارند. این موضوع بیانگر اهمیت و کارآیی قابل توجه داده‌های تشریح خاک‌رخ برای کاربرد در توابع انتقالی خاک نسبت به داده‌های آزمایشگاهی در این منطقه مطالعاتی می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

The Application of Soil Profile Information to Estimate the Soil Organic Carbon using Pedotransfer Functions

نویسندگان [English]

  • Mohsen Bagheri Bodaghabadi
  • Mohammad Jamshidi
  • Zohreh Mosleh
Soil and Water Research Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran
چکیده [English]

Soil organic carbon (OC) is one of the most important soil properties, especially from an environmental point of view. For this reason, OC modeling and estimating has been highly considered. In modeling, application of pedotransfer functions to estimate soil properties from the other ones have an important place in soil science. Unfortunately, not much attention has been paid to the valuable data that are obtained with the least cost and time in the soil profile description. The aim of this study was to determine the importance of data that obtained from soil profile description to estimate the soil organic carbon in Dehgolan region in Kordestan Province. For this purpose, 30 pedons were excavated and described. Soil samples were collected from different horizons and soil properties such as texture, pH, EC, CCE and gypsum were determined. Modeling was performed in three scenario including laboratory data, data of soil profile description and application of laboratory and soil profile description data simultaneously. The results showed that based on laboratory data, soil organic carbon has a significant relationship with silt and CCE properties with a coefficient of determination about 25% (R2 = 0.25); While, the two soil profile description data of soil color (chroma) and genetic horizon with coefficients of determination about 65% (R2 = 0.65). With compilation of laboratory and soil profile description data the coefficient of determination was also obtained 65%. This level of accuracy clearly shows the value and importance of data related to the soil profile description data.

کلیدواژه‌ها [English]

  • pedotransfer functions
  • Modeling
  • Regression models
  • Soil morphology
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