تغییرات فصلی ذخیره کربن آلی خاک در توده مدیریت‎شده و مدیریت‎نشده راش- ممرز

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دکتری جنگل‎شناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

2 دانشیار، گروه جنگل‎شناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

چکیده

کربن آلی خاک یکی از مهمترین مؤلفه‎های چرخه جهانی کربن است، بنابراین خاک جنگل‎ها به‌عنوان یکی از بزرگترین ذخیره‎گاه‎های کربن آلی در اکوسیستم خشکی در کنترل غلظت Co2 اتمسفر نقش اساسی دارد. دخالت در اکوسیستم جنگلی در مقطع زمانی نامناسب با تغییر در آزادسازی یا جذب کربن در آن، تأثیرات قابل ملاحظه‎ای بر غلظت Co2 اتمسفر و گرمایش جهانی دارد. این پژوهش به بررسی تأثیر شیوه گزینشی بر تغییرات ذخیره کربن آلی خاک در فصول مختلف در توده‎های آمیخته راش- ممرز سری یک طرح جنگل‌داری دکتر بهرام‎نیا استان گلستان پرداخت. تغییرات ذخیره کربن آلی خاک از بهمن 1392 به‌مدت یکسال در چهار توده یک هکتاری (توده بکر پارسل 32 و پارسل‎های 30، 33 و 31 که به‎ترتیب 10، هفت و یک سال از دخالت در آن‌ها می‎گذشت) در عمق صفر تا 20 سانتی‎متری بررسی شد. تغییرات درجه حرارت و رطوبت خاک به‌عنوان عامل‌های تأثیرگذار بر ذخیره کربن اندازه‎گیری شدند. برای تعیین تغییرات رطوبت و حرارت خاک در هریک از تیمارها از تجزیه واریانس یک‌طرفه و برای مقایسه فصلی ذخیره کربن آلی خاک در هر تیمار، از طرح اندازه‎های تکراری استفاده شد. رابطه‌ ذخیره کربن با رطوبت و حرارت خاک با استفاده از ضریب همبستگی پیرسون بررسی شد. نتایج نشان داد که تغییرات ماهانه رطوبت و حرارت خاک در هر تیمار دارای اختلاف معنی‎داری بود. ذخیره کربن آلی خاک با حرارت و رطوبت خاک نیز همبستگی معنی‎داری را نشان داد. بررسی ذخیره کربن آلی خاک در فصول مختلف، اختلاف معنی‌داری را نشان داد، اما این اختلاف در تیمارهای مدیریت‌شده بیشتر مشهود بود. در توده‌های مدیریت‌شده، ذخیره کربن در تابستان کاهش شدیدی نسبت به توده شاهد داشت.

کلیدواژه‌ها

عنوان مقاله [English]

Seasonal changes of soil organic carbon pool in the managed and unmanaged beech-hornbeam stands

نویسندگان [English]

  • Maryam Moslehi 1
  • Hashem habashi 2
  • Ramin Rahmani 2
1 Ph.D. Silviculture and Forest Ecology, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Associate Prof., Department of Silviculture and Forest Ecology, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
چکیده [English]

Soil organic carbon (SOC) is a major component of global carbon cycle, hence forest soil as one of the major carbon sinks has a key role in the control of atmospheric Co2 concentrations. Consequently, changes of carbon release or uptake by forest ecosystems due to disturbance or management in an unsuitable period can have a considerable impact on atmospheric Co2 concentrations and global warming. In this study, the effect of selection systems were investigated on seasonal changes of soil organic carbon pool (SOCP) in the mixed beech-hornbeam stand in district one of Shastkolate forest, Golestan province. For this purpose, SOCP was determined in depth of 0-20 cm  from February of 2014 to February of 2015 in four stands with one hectare area (one in compartment 32 of virgin forest) and three in compartments 30, 33 and 31 in managed forest, in which the last interventions date back to 10, 7 and 1 years ago). Soil temperature and moisture changes were measured through one year as effective factors on SOCP. One-way ANOVA were used to determine soil moisture and temperature variability in each treatment through one year, and seasonal dynamics of SOCP were comprised using repeated measures design (General linear model). The SOCP relationship with soil moisture and temperature were analyzed using Pearson correlation coefficient. Results showed that the monthly changes of soil moisture and temperature had a significant difference in each treatment. SOCP was also significantly correlated with soil moisture and temperature. SOCP difference in different seasons was also significant, which was more obvious in the managed treatments. SOCP showed severe decrease in the managed stands compared to the unmanaged stand in the summer.

کلیدواژه‌ها [English]

  • Forest management plan
  • Golestan Province
  • Soil Moisture
  • Soil temperature
  • selection method

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