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اثر عمق خاک و ارتفاع منطقه بر فعالیت آنزیمهای مختلف در خاکهای جنگلی منطقه ارسباران | ||
تحقیقات آب و خاک ایران | ||
دوره 52، شماره 12، اسفند 1400، صفحه 3123-3109 اصل مقاله (1.49 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2022.335043.669151 | ||
نویسندگان | ||
الهام جزدایمی* 1؛ احمد گلچین2 | ||
1گروه خاکشناسی-دانشکده کشاورزی-دانشگاه زنجان-زنجان-ایران | ||
2گروه علوم خاک، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران | ||
چکیده | ||
آنزیمهای خاک شاخصهای مؤثری از کیفیت خاک محسوب میشوند. در پژوهش حاضر، فعالیت برخی آنزیمهای خاک شامل اورهآز، بتاگلوکوزیداز، سلولاز، آریلسولفاتاز، دهیدروژناز و فسفاتازهای اسیدی و قلیایی در خاکهای جنگلی منطقه ارسباران تحتتأثیر دو عامل ارتفاع منطقه و عمق خاک مورد بررسی قرار گرفت. بدین منظور، یک آزمایش فاکتوریل در قالب طرح بلوکهای کامل تصادفی با سه تکرار انجام شد. فعالیت آنزیمهای خاک در نمونههای برداشتشده از عمقهای مختلف خاک (20-0، 40-20، 60-40، 80-60 و 100-80 سانتیمتری) در ارتفاعات مختلف (600-0، 1200-600، 1800-1200 و 2400-1800 متری) و در شیب شمالی منطقه اندازهگیری شد. نتایج نشاندهنده اثر معنیدار عمق خاک و ارتفاع بر فعالیت آنزیمهای موردمطالعه بود؛ هرچند، عکسالعمل آنزیمهای مختلف به این عوامل یکسان نبود. بیشترین فعالیت آنزیمهای اورهآز، بتاگلوکوزیداز، سلولاز، آریلسولفاتاز و فسفاتازهای اسیدی و قلیایی در لایه سطحی خاک (20-0 سانتیمتری) اندازهگیری شد که به ترتیب با افزایش عمق به طور میانگین 50، 71، 81، 71، 59 و 66 درصد کاهش یافت. اما، فعالیت آنزیم دهیدروژناز با افزایش عمق 15 تا 43 برابر افزایش یافت. بعلاوه، با افزایش ارتفاع از 600-0 تا 2400-1800 متری، درحالیکه به طور متوسط فعالیت آنزیمهای اورهآز، آریلسولفاتاز و بتاگلوکوزیداز به ترتیب 15/1، 4/1 و 19/1 برابر افزایش یافت، فعالیت آنزیمهای سلولاز و فسفاتازهای اسیدی و قلیایی به ترتیب 26، 4/10 و 6/9 درصد کاهش یافت. اما، اثر ارتفاع بر فعالیت دهیدروژناز معنیدار نبود. نتایج همچنین حاکی از همبستگی مثبت و معنیدار (P ≤ 0.01) کربن آلی و کربن زیستتوده میکروبی با فعالیت تمام آنزیمهای بررسیشده بهجز دهیدروژناز بود. یافتههای این پژوهش چگونگی تغییرات فعالیت آنزیمهای مختلف با دو عامل عمق خاک و ارتفاع را آشکار مینماید. | ||
کلیدواژهها | ||
آنزیمهای خاک؛ عوامل اقلیمی؛ کربن آلی؛ کربن زیستتوده میکروبی | ||
مراجع | ||
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