بررسی تأثیر آتش‌سوزی بر فراهمی برخی عناصر غذایی و خصوصیات شیمیایی خاک مرتعی (مطالعۀ موردی: مراتع مروارید، منطقۀ داراب)

نویسندگان

1 دانشگده کشاورزی و منابع طبیعی داراب-دانشگاه شیراز

2 دانشکده کشاورزی و منابع طبیعی داراب-دانشگاه شیراز

10.22052/6.16.35

چکیده

آتش‌سوزی می‌تواند بر پایداری بسیاری از زیست‌بوم‌های طبیعی از طریق تغییر در ویژگی‌های فیزیکی، شیمیایی و بیولوژیکی خاک تأثیر بگذارد. هدف از پژوهش حاضر، بررسی اثرات آتش‌سوزی بر برخی از خصوصیات شیمیایی و فراهمی عناصر غذایی خاک مرتعی (مراتع مروارید، منطقۀ داراب) است. برای انجام این پژوهش، یک منطقۀ آتش‌سوزی با سابقۀ پنج ‌ماه و یک منطقه همگن بدون آتش‌سوزی (شاهد) در کنار آن انتخاب شد. تعداد 30 نمونه‌ خاک ‌سطحی (0 تا 20 سانتی‌متر) با استقرار 15 پلات در هر منطقه (شاهد و آتش‌سوزی) برداشته شد. خصوصیات خاک دو منطقه از طریق آزمون t مستقل و با استفاده از نرم‌افزارSPSS آنالیز گردید. نتایج نشان داد پس از آتش‌سوزی به‌‌طور معنی‌داری مقدار مادۀ آلی (15/2 برابر)، ظرفیت تبادل کاتیونی (65/21‌درصد) و شوری خاک (3 برابر) افزایش و مقدار کربنات ‌کلسیم‌ معادل (2/27‌درصد) و pH خاک (5/4‌درصد) کاهش یافت. همچنین مقدار نیتروژن کل (2/2 برابر)، فسفر(100‌درصد)، پتاسیم (5/66‌درصد)، منگنز (17 برابر) و روی (92/2 برابر) قابل‌استفاده در خاک پس از آتش‌سوزی به‌‌طور معنی‌داری افزایش ‌یافت. مقدار آهن و مس قابل‌استفاده در اثر آتش‌سوزی تغییر معنی‌داری نداشت. به‌طور ‌کلی، نتایج نشان داد که حاصلخیزی خاک موردمطالعه در اثر آتش‌سوزی کوتاه‌مدت افزایش یافت، البته باید تأثیرات بلندمدت آتش‌سوزی نیز مورد ارزیابی و مقایسه قرار گیرد.

 
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of the Fire Eeffect on Some Nutrient Availability and Chemical Properties of a Rangeland Soil (Case Study: Morvarid Rangeland, Darab Region)

نویسندگان [English]

  • Alireza Mahmoodi 1
  • Hamid Reza Boostani 2
1
2
چکیده [English]

Fire can influence the stability of many natural habitats via changes in biological, chemical and physical properties of soil. The aim of the present study was to investigate the effects of fire on some chemical properties and nutrients availability in a rangeland soil. To perform this research, a fired area with a five-month history and a homogenized area close to it without fire were selected. Thirty samples of surface soil were collected by establishment of 15 plots in each area. Soil properties were analyzed using SPSS software via independent t-test. The results revealed that the rate of organic matter (2.15 folds), cation exchange capacity (21.65%) and electrical conductivity (3 folds) of fired soil were increased and the content of calcium carbonate equivalent (27.2%) and pH (4.5%) were decreased significantly. Also, the amount of total nitrogen (2.2 folds), available phosphorous (100%), potassium (66.5%), manganese (17 folds) and zinc (2.92 folds) were significantly increased in fired soil. The magnitude of available copper and iron didn’t change as influenced by fire significantly. In general, the results showed that the fertility of soil was promoted as affected by short-term fire; however, long-term effects of fire must be evaluated and compared.
 

کلیدواژه‌ها [English]

  • Soil organic matter
  • Soil pH
  • Available phosphorous
  • Micro nutrients
  • Cation Exchange Capacity
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