روش‌های زمینی به منظور اندازه‌گیری مستقیم مقدار شاخص سطح برگ (LAI)

الموضوعات :

سید محمد معین صادقی ¹ (پژوهشگر پسادکتری اکوهیدرولوژی جنگل، مدرسه جنگل، شیلات و علوم ژئوماتیک، دانشگاه فلوریدا، گنزویل، فلوریدا، آمریکا)
ناصح میری ² (دانشجوی دکتری جنگلداری، دانشکده منابع طبیعی، دانشگاه تهران)

تاريخ الإرسال : 05 الأحد , محرم, 1437 تاريخ التأكيد : 17 السبت , شوال, 1442 تاريخ الإصدار : 18 الإثنين , شعبان, 1443

الکلمات المفتاحية: رابطه ی وزن برگ به سطح برگ, روش درخت مدل, روش تله لاشبرگ, روش کوادرات نقطه ای, روش پلانی متر,

ملخص المقالة :

زمینه و هدف: شاخص سطح برگ (LAI) از مهم‌ترین مشخصه های ساختاری در بوم سازگان های کشاورزی، مرتعی و جنگلی است که بیش‌ترین تاثیر را در تغییرات انرژی، آب و گاز دارد. با توجه به نوپا بودن مطالعات مقادیر LAI در داخل کشور، هدف از این مقاله، بررسی انواع روش های زمینی مستقیم تعیین مقدار LAI است. روش بررسی: این پژوهش با استفاده از مرور منابع علمی و به کارگیری پایگاه داده های اینترنتی به بررسی موضوع پرداخته است. روش های اندازه گیری مقدار LAI به دو دسته روش‌های زمینی و سنجش از دور تقسیم می شوند که روش های زمینی نیز به دو زیردسته روش های مستقیم و غیرمستقیم (برآوردی) دسته بندی می شوند. یافته ها: با وجود اینکه در دو دهه اخیر، گرایش به استفاده از روش های غیرمستقیم زمینی و سنجش از دور در برآورد مقدار LAI افزایش یافته است، اما به دلایلی هم چون نیاز به دستگاه‌های نیمه پیشرفته و پیشرفته و عدم دسترسی به تصاویر ماهواره ای به صورت رایگان در بیش تر نقاط دنیا، سبب شده است که هنوز روش های زمینی مستقیم محاسبه مقدار LAI کاربرد وسیعی داشته باشد. هم چنین دقت و صحت بالای روش های زمینی مستقیم در مقایسه با روش های غیرمستقیم زمینی و سنجش از دور، دلیل دیگر بر ارجح بودن روش های مستقیم زمینی در اندازه گیری مقدار LAI است. بحث و نتیجه گیری: نتایج این بررسی نشان داد که روش تله لاشبرگ، می تواند به عنوان کاراترین روش به دلیل صحت و دقت بالا که درجه تخریب آن به طبیعت بسیار اندک است، در پژوهش های پیش رو مورد استفاده پژوهشگران قرار بگیرد.

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