مطالعه پویایی عناصر غذایی اصلی گونه Bromus tomentellus Bornm طی روند تجزیه لاشبرگ
محورهای موضوعی : ژنتیکزینب جعفریان 1 , زهرا یوسفی 2 , محمد حجتی 3 , محمد طیبی 4
1 - دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران
2 - دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران
3 - دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران
4 - ایستگاه آموزشی و پژوهشی حسین‌آباد فارس، ایران
کلید واژه: کیسه لاشبرگ, عناصر غذایی اصلی, نسبت C/N, نرخ تجزیه, Bromus tomentellusBromus tomentellus,
چکیده مقاله :
از آنجایی که گونه Bromus tomentellus یکی از مهمترین گونه‌های اکوسیستم‌های طبیعی از نظر کیفیت و کمیت در کشور ایران می‌باشد در تحقیق حاضر سعی شده تا با بررسی پویایی عناصر غذایی و سرعت تجزیه پذیری برگ و ساقه این گونه در مدت زمان یک سال، به شناخت روند تجزیه آن پرداخته شود. در این مطالعه از تکنیک کیسه لاشبرگ با ابعاد 20×20 سانتی‌متر و با منافذ 2 میلی‌متر استفاده شد. هر کیسه با حدود 5 گرم نمونه گیاه خشک شده پر گردید. مجموعا 54 کیسه با تیمارهای برگ، ساقه و ترکیب برگ و ساقه در سه تکرار در ایستگاه آموزشی پژوهشی حسین آباد شیراز جایگذاری گردید. برداشت کیسه‌ها در فواصل زمانی 60 روز (6 بار در سال) انجام گردید. پس از هر برداشت مقدار عناصر غذایی نیتروژن، کربن، پتاسیم، فسفر و نسبت کربن به نیتروژن در برگ، ساقه و ترکیب برگ و ساقه گونه مذکور اندازه‌گیری شدند. نتایج نشان داد که در پایان آزمایش درصد نیتروژن در برگ برابر 02/1 بوده که نسبت به نیزوؤن ساقه به مقدار 65/0 و ترکیب برگ و ساقه به مقدار 34/0، بیشتر بود. همچنین در این تحقیق مشخص گردید ثابت تجزیه سالانه برگ، ساقه و ترکیب برگ و ساقه این گونه به‌ترتیب برابر 22/1، 95/0 و 08/1 است.
Since Bromes tomentellus is one of the most important species in natural ecosystems in Iran both quantitatively and qualitatively, this research investigated decomposition process of Bromes tomentellus through studying dynamism of the main nutrient elements and decomposition rate of leaves and stems of the plantin a period of one year. The litter bag technique with size of 20×20 cm and 2 mm pores was used in this research. Each bag was filled with 5 g dried plant specimens. A totallof 54 bags with leaf, stem, and combination of leaf and stem were placed with three replications in Hosein Abad Research Station. Bags were taken at intervals of 60 days (6 times in a year). The amount of nutrients N, C, K, P, and C/N in leaves, stems, and the combination of leaves and stems were measured after each sampling. The results showed that the percentage of N in leaf was 1.02 which was 0.65 and 0.34 more in comparison with the nitrogen content of stem and the combination of leaf and stem, respectively. Also, annual decomposition constants of leaves, stems, leaves and stems of this species were 1.22, 0.95, and 1.88 respectively.
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