بهبودپذیری نفوذ آب در یک خاک حساس به فرسایش در شرایط آزمایشگاهی از طریق افزایش مصنوعی جمعیّت ریزموجودات خاکزی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد/ دانشگاه تربیت مدرّس

2 دانشگاه تربیت مدرس

چکیده

ویژگی‌های تولید رواناب یکی از مهم‌ترین مؤلفه‌های هیدرولوژیکی و ، نمایان‌گر وضعیت سلامت آبخیزها می‌باشد. هم‌چنین نفوذ آب در خاک یکی از مؤلفه‌های خاکی مهم تعیین‌کننده تولید رواناب بوده که راه‌کارهای متعددی برای بهبود آن مورد استفاده و بررسی آزمایش قرار گرفته، ولی  است. حال آن‌که نقش افزایش جمعیت ریزموجودات خاک‌زی با هدف بهبود مقدار نفوذ آب در خاک کمتر مورد توجه قرار گرفته است. لذا در پژوهش حاضر سعی شد تأثیر افزایش مصنوعی جمعیت باکتری‌های خاک به‌عنوان راه‌کاری کاملاً زیستی و نوین در بهبود ویژگی‌های نفوذپذیری خاک مورد ارزیابی قرار گیرد. بر همین اساس، ضمن نمونه­برداری از یک خاک حساس به فرسایش از منطقه مرزن‌آباد-کندلوس، باکتری‌های مفید خاک شامل گروه Bacillus subtilisوAzotobacter sp. جداسازی و به‌همراه ماده‌ی غذایی محرّک B4 به‌صورت جداگانه و ترکیبی روی فلوم‌های کوچک فرسایشی تلقیح شدند. با گذشت 60 روز از تلقیح، مقدار نفوذ آب در خاک پس از شبیه‌سازی باران در شرایط آزمایشگاهی اندازه‌گیری شده و تجزیه و تحلیل‌های آماری صورت گرفت. نتایج نشان داد که تمام تیمارهای تلقیحی جداگانه باکتری‌های گروه Bacillus subtilis و Azotobacter sp.، ماده‌ی غذایی محرّک B4 و ترکیبی باکتری‌ها با ماده‌ی غذایی محرّک B4 در سطح اطمینان 99 درصد باعث افزایش نفوذ آب در خاک و طبعاً کاهش حجم و ضریب رواناب نسبت به تیمار شاهد شدند. تیمارهای تلقیح جداگانه باکتری‌‌های گروه Bacillus subtilis و Azotobacter sp.، ماده غذایی B4 و ترکیبی آن‌ها به‌ترتیب منجر به افزایش 18، 10 و 21 درصدی نفوذ آب در خاک شدند. نتایج پژوهش فعلی ضمن تأیید نقش غنی‌سازی جمعیت باکتریایی سطح خاک از طریق تلقیح و تحریک باکتری‌ها در افزایش نفوذ، نشان داد که تلقیح ترکیبی باکتری با ماده حمایتی محرّک و غذایی بهترین عملکرد در افزایش نفوذ آب در خاک مورد مطالعه را داشت. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Improvability of Water Infiltration in an Erosion-Prone Soils under Laboratorial Conditions through Artificial Increasing of Soil Microorganisms Population

نویسندگان [English]

  • Seyed Hamidreza Sadeghi 1
  • Hossein Kheirfam 2
  • Mehdi Homaee 2
  • Behrouz Zarei Darki 2
1 Professor/ Tarbiat Modares University
2 Tarbiat Modares University
چکیده [English]

Runoff production process is a key hydrological component illustrating watersheds health. Water infiltration in soil is also one of the determinant factors on runoff generation for which many techniques were used to improve it. However, the role of microorganisms for the improvement of water infiltration in soil has been less considered. The present study therefore tried to investigate the effect of artificial soil bacteria population proliferation as a completely biologically and modern technique to improve soil surface properties and increase soil infiltration. To this end, the beneficial bacteria include Bacillus subtilis strain and Azotobacter sp. were isolated and inoculated individually and combined with B4 stimulant nutrient matter to small erosion plots filled by an erosion-prone soil of Marzanabad-Kandelus road neighboring region and left for 60 days. The water infiltration in soil was then measured after rainfall simulation in experimental condition and then the statistical analyses were conducted. The results showed that the inoculation treatments (individually inoculation of Bacillus subtilis strain and Azotobacter sp., individually injection of B4 stimulant nutrient matter and combined inoculation of bacteria and B4 stimulant nutrient matter) improved the water infiltration in soil and reduced volume and consequently coefficient of runoff in 99% of confidence level compared to control. The water infiltration in soil in Bacillus subtilis strain and Azotobacter sp. bacteria inoculation, B4 stimulant nutrient matter and their combined treatments increased about 18, 10 and 21%, respectively. In conclusion, enrichment of soil crust bacteria population through inoculation and simulation techniques was approved in reducing runoff yield. The combined inoculation of Bacillus subtilis strain and Azotobacter sp. bacteria with B4 stimulant nutrient matter had the best performance in increasing water infiltration in study soil.

کلیدواژه‌ها [English]

  • Bio-amendments
  • Ecohydrology
  • Land degradation
  • Soil and Water Conservation
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