شبیه‌سازی پویایی کربن آلی خاک با استفاده از مدل RothC در کاربری‌های مختلف اراضی ایستگاه تحقیقاتی سارال استان کردستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم خاک، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

2 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

3 گروه مرتعداری، دانشکده منابع طبیعی، دانشگاه کردستان، سنندج، ایران

4 گروه علوم و مهندسی خاک دانشکده کشاورزی دانشگاه کردستان، سنندج، ایران

10.22059/ijswr.2022.339220.669211

چکیده

RothC یکی از موفق­ترین مدل­ها برای شبیه­سازی تأثیر تغییرات آب و هوایی و فعالیت­های مدیریتی در اکوسیستم­های طبیعی در سطح محلی، منطقه­ای و جهانی است. هدف این تحقیق واسنجی و اعتبارسنجی مدل RothC برای تجزیه ‌و تحلیل ذخایر کربن آلی خاک طی سال­های 1990 تا 2020 میلادی (وضعیت کنونی) و تعریف سناریوهای حفظ وضعیت کنونی (سناریو 1)، تغییر اقلیم (سناریو 2)، کوددهی با کود دامی (سناریو 3) و تغییر اقلیم همراه با کوددهی با کود دامی (سناریو 4) تا سال 2100 میلادی در کاربری­های چمنزار، مرتع و اراضی کشاورزی با تناوب‌های زراعی گندم – آیش و گندم – نخود در ایستگاه تحقیقاتی سارال استان کردستان است. مدل با استفاده از داده­های اندازه­گیری شده در سال­های 1389 (مرتع و چمنزار) و 1394 (اراضی کشاورزی) و داده­های آب‌وهوای محلی پارامتریابی و با مطابقت داده­های خروجی مدل با داده­های مشاهده‌شده واسنجی گردید. مدل تغییرات ذخایر کربن آلی خاک را در سناریوهای مختلف کوددهی و تغییر اقلیم به‌خوبی پیش­بینی کرد به‌طوری‌که میانگین جذر مربعات خطا 92/8 درصد و راندمان مدل­سازی 74/0 محاسبه شد. نتایج شبیه­سازی نشان داد تغییرات اقلیمی در کاربری­های موردمطالعه موجب کاهش مقادیر ذخایر کربن آلی خاک در مقایسه با سناریو حفظ وضعیت کنونی تا سال 2100 میلادی خواهد شد. عملیات کوددهی با کود دامی (سناریو 3) بهترین سناریو و کاربری چمنزار پس از اعمال این سناریو با 83/59 تن در هکتار ذخیره کربن آلی خاک تا 2100 به‌عنوان بهترین کاربری در مقادیر ترسیب کربن بود. بیشترین مقدار نرخ ذخیره کربن آلی و تغییرات ترسیب کربن آلی طی 80 سال آینده در کاربری مرتع به ترتیب با 9/32 درصد و 16/0 تن در هکتار (سناریو 3) و کمترین در اراضی کشاورزی با تناوب زراعی گندم – آیش به ترتیب با 32- درصد و 11/0- تن در هکتار (سناریو 2) برآورد شد.

کلیدواژه‌ها


عنوان مقاله [English]

Simulating soil organic carbon dynamics using RothC in grasslands range and croplands Saral Research Center Kurdistan Province

نویسندگان [English]

  • Pouria Shahsavari 1
  • Mohammad Amir Delavar 2
  • Parviz Karami 3
  • Kamal Nabiollahi 4
1 Department of soil science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
2 Department of Soil Science and Engineering Faculty of Agriculture, University of Zanjan, Zanjan, Iran
3 Rangeland Science, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran
4 Department of Soil Science and Engineering Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran
چکیده [English]

RothC is among the most successful models in terms of simulating the impacts of climate change and management activities in natural ecosystems on local and global scales. The current research was carried out to assess and validate RothC in studying SOC content from 1990 to 2020 and defining the scenarios of maintaining the current situations (scenario 1), climate change (scenario 2), manure fertilizing till 2100 (scenario 3), and climate change with manure fertilizing till 2100 (scenario 4) in grasslands, range, and croplands in Saral Research Center, Kurdistan Province, under rotations of wheat-uncultivation and wheat-pea. The parameters of the model were determined by using the measured data from the soils sampled at two years (2018 and 2019) from Saral Research Center and the local weather data, Next, the model was validated by comparison of the predicted values with the measured SOC data. Assessment of the measured and simulated data through validation for different land uses revealed that RothC could satisfactorily predict the changes in SOC contents under different fertilizing and climate change scenarios so that root mean square error (RMSE) and the simulation efficiency were calculated as 8.92% and 74.0%, respectively. The simulation results indicated that compared to scenario1, climate change in the studied land uses will cause a decrease in SOC contents till 2100. Manure fertilizing (scenario3) would be the best scenario so that by using this strategy the grassland, with 59.83 ton SOC per hectare until the end of the current century. According to the results predicted by the model, the highest SOCrate (32.9%) and the most change in SOC sequestration (ΔSOCs) (0.16 t/h) during the next 80 years were calculated in the range under scenario 3; whereas the lowest values (-32.0% and -0.11 t/h, respectively), were achieved in croplands under rotations of wheat-uncultivation under scenario2.

کلیدواژه‌ها [English]

  • Carbon sequestration
  • Saral
  • Management scenarios
  • RothC
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