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تأثیر جنگلکاری با گونههای توسکا قشلاقی (.Alnus glutinosa (L.) Gaertn) و کاج تدا (.Pinus taeda L) روی فعالیت و زیتوده میکروبی خاک (مطالعه موردی: منطقه گیسوم- غرب استان گیلان) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 14، دوره 20، شماره 2 - شماره پیاپی 48، تیر 1391، صفحه 345-334 اصل مقاله (261.98 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2012.107304 | ||
| نویسندگان | ||
| علی صالحی1؛ محمد متینیزاده* 2؛ جلوه تمجیدی3 | ||
| 1استادیار، دانشکده منابع طبیعی، دانشگاه گیلان | ||
| 2استادیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور | ||
| 3دانشجوی کارشناسی ارشد جنگل شناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه گیلان | ||
| چکیده | ||
| خواص زیستی خاک مناسبترین شاخص برای تعیین کیفیت خاک میباشد، زیرا با چرخههای غذایی، تنفس خاک، زیتوده میکروبی و فعالیت آنزیمهای خاک ارتباط دارند. این تحقیق بهمنظور بررسی تأثیر دو توده همسال و مجاور هم، کاج تدا (Pinus taeda L.) و توده طبیعی توسکای قشلاقی (Alnus glutinosa (L.) Gaertn.) بر فعالیت آنزیمهای دهیدروژناز و اورهآز و زیتوده میکروبی و برخی خصوصیات فیزیکی و شیمیایی خاک در غرب استان گیلان انجام شد. در این دو توده از دو عمق 10-0 و 10 تا 20 سانتیمتری نمونه خاک برداشت شد. فعالیت آنزیمهای دهیدروژناز و اورهآز و زیتوده میکروبی با استفاده از واکنش با سوبسترا و توسط اسپکتروفتومتر سنجش گردید. بافت خاک، جرم مخصوص ظاهری و حقیقی، درصد رطوبت، pH، کربن آلی، ازت کل، فسفر قابل جذب و پتاسیم محلول نیز در این دو توده بررسی شد. نتایج نشان داد که آنزیم دهیدروژناز و اورهآز، زیتوده میکروبی، کربن، ازت و پتاسیم در بین دو توده اختلاف معنیداری داشت که مقدار آنزیمهای اورهآز و دهیدروژناز و همچنین میزان زیتوده میکروبی، کربن آلی و ازت در توده طبیعی توسکا بیشتر از توده دست کاشت کاج تدا بود. غلظت همه آنزیمهای اندازهگیری شده با زیتوده میکروبی، کربن آلی، ازت، pH، پتاسیم، بافت و تخلخل خاک همبستگی معنیدار را نشان دادند. براساس نتایج این تحقیق میتوان عنوان نمود که توده توسکای قشلاقی نسبت به کاج تدا شرایط مناسبتری را برای تولید مواد آلی، زیتوده میکروبی و فعالیت میکروارگانیسمهای خاک فراهم آورد. | ||
| کلیدواژهها | ||
| آنزیمهای خاک؛ میکروارگانیسم؛ توسکای قشلاقی؛ کاج تدا | ||
| عنوان مقاله [English] | ||
| Investigation on effect of forest plantation of Alnus ghutinosa L. (Gaertn.) and Pinus taeda L. on soil microbial activity and biomass (case study: Geisom site, west of Guilan province, Iran) | ||
| نویسندگان [English] | ||
| Ali Salehi1؛ Mohammad Matinizadeh2؛ Jelveh Tamjidi3 | ||
| 1Assistant Prof., Faculty of Natural Resources, University of Guilan | ||
| 2Assistant Prof., Research Institute of Forests and Rangelands | ||
| 3Postgraduate Student, Faculty of Natural Resources, University of Guilan | ||
| چکیده [English] | ||
| Biological property is a best indicator for soil quality identification due to its relationships with soil nutrient cycle, respiration, microbial biomass and enzymes activity. The aim of the research was to study the influence of two even-aged and adjacent stands of loblolly pine (Alnus glutinosa L. (Gaertn.) and alder (Pinus taeda L.) on activity of dehydrogenase and urease enzymes, microbial biomass and some of the soil chemical and physical properties at west of Guilan province. Soil sampling was made up to 20 cm depth of soil surface (0-10 and 10-20cm). Dehydrogenase and urease enzymes activities and microbial biomass were measured, using the substrate reaction method and application of spectrophotometer device. The tested soil properties consisted of: texture, bulk density, mean particle density, moisture content, pH, organic carbon, total nitrogen, phosphorus and potassium. The results showed that there were significant differences between the two stands in respect to amounts of dehydrogenase and urease enzymes, microbial biomass, carbon, nitrogen and potassium. The amount of urease and dehydrogenase enzymes, microbial biomass, organic carbon and nitrogen in alder stand was more than in the loblooly Pine stand. There were significant correlations between the enzymes density and microbial biomass, organic carbon, nitrogen, pH, potassium, soil texture and soil porosity. Overall, it might be concluded that the alder stand provided better condition for organic matter and microbial production and microbial biomass development and activity. | ||
| کلیدواژهها [English] | ||
| soil, Enzyme, Urease, dehydrogenase, Microbial biomass, Alnus glotinosa, Pinus taeda | ||
| مراجع | ||
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