بررسی ارتباط بین شاخص سطح برگ و میزان ترسیب کربن در خاک توده‌های جنگلی خالص و آمیخته دست‌کاشت بلندمازو (مطالعه موردی: جنگلهای جلگه‌ای چمستان)
محورهای موضوعی : جنگلداری
1 - عضو هیات علمی دانشکده آب و خاک ، دانشگاه زابل ، زابل ، ایران
کلید واژه: شاخص سطح برگ, ترسیب کربن, بلند مازو, جنگل‌کاری, ترکیب آمیختگی,
چکیده مقاله :
چکیده این تحقیق به منظور بررسی وجود رابطه میان شاخص سطح برگ با مقدار ترسیب کربن در خاک در ایستگاه تحقیقات جنگل و مرتع چمستان در قالب یک طرح کاملاً تصادفی صورت گرفته است که در آن گونه بلند مازو به صورت خالص و آمیخته با هر یک از گونه‌های آزاد، پلت، داغداغان و ممرز در سال 1373 جنگل‌کاری شده است. برای نمونه‌برداری برگ‌ها شش درخت از هر گونه در هر تیمار انتخاب گردید. میزان شاخص سطح برگ به روش مستقیم وزنی محاسبه شد. میزان اثربخشی هر یک از توده‌های جنگلی بر میزان ترسیب کربن خاک در دو عمق 20-0 سانتی متر و 60-21 سانتی متر مورد مطالعه قرار گرفت. نتایج نشان داد که توده آمیخته بلندمازو و افرا با 96/5 و توده آمیخته بلندمازو و آزاد با 63/3 به ترتیب بیشترین و کمترین شاخص سطح برگ را داشته‌اند. درختان بلوط در حالت آمیخته با افرا کمترین شاخص سطح برگ را دارا می‌باشند. در عمق اول خاک میزان ترسیب کربن در خاک در توده خالص بلوط به مقدار 8/92 تن در هکتار برآورد گردید و توده آمیخته بلوط ممرز بیشترین (16/120 تن در هکتار) و تیمار شاهد بدون جنگل‌کاری شده کمترین (0/75 تن در هکتار) ترسیب کربن در خاک را به خود اختصاص داده‌اند. در عمق 40 سانتی متری دوم این میزان از 56/96 تا 86/145 تن در هکتار متغیر بوده و توده‌های مختلف اختلاف معنی‌داری از این نظر نداشته‌اند. ضریب پیرسون همبستگی معنی‌داری میان شاخص سطح برگ با میزان ترسیب کربن در خاک را تا به این سن از جنگل‌کاری‌ها نشان نداده است.
This study done aimed to investigating of the relationship between LAI and soil carbon sequestration in Chamestan Forest and Rangeland Research Station in a completely randomized design, which Oak (Quercus castaneifolia) has been planted in pure and mixed with any of the species including Siberian Elm (Zelkova carpinifolia), Maple (Acer velutinum), Hackberry (Celtis australis) and Hornbeam (Carpinus betulus) in 1995. For sampling of leave, six trees were selected from each species in each treatment. The leaf area index was determined by gravimetric method. The effectiveness of each forest stand on carbon sequestration was studied in two soil depths of 0-20 cm and 21-60 cm. The results showed that the highest and lowest amount of LAI was calculated for Oak-Maple mixed stand (5.96) and Oak-Elm mixed stand (3.63) respectively. Oak trees have the lowest LAI in Oak-Maple plantation. Soil carbon sequestration in pure stand of Oak was estimated 92.8 ton/hectare in the first depth and mixed stand of Oak-Hornbeam has the highest (120.16 t/ha) and bare land treatment has the lowest (75.0 t/ha) soil carbon sequestration amount. This parameter at second soil depth of 40 cm varies at the rate of 96.56 to 145.86 t/ha and different stands were not significantly different in this respect. The Pearson correlation hasn’t shown coefficient between LAI and soil carbon sequestration to this age of plantations.
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