ارزیابی مالچ گیاهی تولید شده از گیاه سریش (Eremurus spectabilis) بر کنترل فرسایش بادی خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب و محیط زیست، دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران

2 گروه مهندسی آب و محیط زیست، دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود ایران

چکیده

یکی از چالش‌های اصلی مناطق خشک و بیابانی، نحوه کنترل فرسایش بادی خاک های مستعد فرسایش می‌باشد. فرسایش بادی موجب آسیب هایی جدی به اقتصاد، محیطزیست و سلامت موجودات زنده می‌شود. تحقیق حاضر با هدف تثبیت خاک مستعد فرسایش، با استفاده از مالچ ارگانیک تهیه شده از پودر ریشه گیاه سریش (Eremurus spectabilis )انجام شد. تاثیر غلظت و میزان پاشش مالچ بر میزان فرسایش خاک بررسی و میزان نفوذ و کاهش ضخامت لایه تثبیت یافته در مقابل سرعت بادهای 6 ،9 ،12 و 15 متر بر ثانیه، به مدت زمان 5 دقیقه در تونل باد بررسی گردید. در انتها نیز مقادیر pH، EC ،میزان شوری و دیگر عناصر تشکیل دهنده خاک به منظور ارزیابی تاثیر زیست محیطی مالچ مورد مطالعه، قبل و پس از مالچ پاشی مورد آزمایش قرار گرفت. نتایج نشان داد که افزایش میزان پاشش مالچ باعث نفوذ بیشتر مالچ در خاک و افزایش غلظت مالچ علی رغم کاهش عمق نفوذ آن در خاک، بواسطه افزایش مقدار چسبندگی بین ذرات خاک سبب مقاومت بیشتر آن در مقابل فرسایش بادی می‌شود. همچنین براساس نتایج به دست آمده مالچ هایی با غلظت های 0/2 ،0/6 و 0/7 درصد قادر به تثبیت خاک در برابر جریان باد به ترتیب تا حداکثر سرعت های 9 ،12 و 15 متر بر ثانیه است. به طور کلی مالچ گیاهی مذکور مالچی سازگار با محیطزیست و گزینه ای مناسب برای کنترل فرسایش بادی خاک‌های مستعد فرسایش محسوب می‌گردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of the vegetable mulch produced from Eremurus spectabilis on soil erosion control

نویسندگان [English]

  • Amir Amraei 1
  • Behnaz Dahrazma 2
1 department of water and environmental engineering, faculty of civil engineering, shahrood university of technology, shahrood, iran
2 department of water and environmental engineering, faculty of civil engineering, shahrood university of technology, shahrood, iran
چکیده [English]

One of the main challenges of arid and desert regions is to control wind erosion that can cause significant economic and environmental damage. The present study aimed to stabilize erosionprone soil using a vegetable mulch prepared from Eremurus spectabilis root powder. The effects of concentration and amount of mulch spraying on the soil erosion were investigated. Also, the penetration and reduction of the thickness of the fixed layer against wind speeds of 6, 9, 12 and 15 m/s for 5 minutes were studied in the wind tunnel. Finally, EC, pH, salinity and other soil elements were tested to evaluate the environmental impact of mulching. The results showed that increasing the amount of mulch spraying results in more mulch penetration in the soil and increasing the mulch concentration, despite reducing the depth of its penetration into the soil due to increasing the amount of adhesion between the soil particles, its greater resistance to wind erosion. In addition, based on the results, mulches with concentrations of 0.2, 0.6 and 0.7% can stabilize the soil against the wind stream, up to a maximum of 9, 12 and 15 m/s, respectively. Generally, the mulch is environmentally friendly and is an appropriate option for controlling the erosion of wind erosion-prone soil.

کلیدواژه‌ها [English]

  • Stabilization
  • Soil
  • wind erosion
  • vegetable mulch
  • Wind tunnel
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