بررسی توابع توزیع احتمال طبقات تاج‌پوشش جست‌گروهای بلوط ایرانی در زاگرس میانی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مدیریت جنگل، دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان، خرم‌آباد، ایران

2 دانشیار، گروه جنگلداری، دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان، خرم‌آباد، ایران

3 دکتری علوم جنگل، دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان، خرم‌آباد، ایران

4 دانشجوی دکتری علوم جنگل، دانشکده منابع طبیعی دانشگاه تربیت مدرس، نور، ایران

چکیده

در پژوهش پیش رو وضعیت کمی و توابع توزیع احتمال طبقات تاج­پوشش جنگل‌های شاخه‌زاد بلوط ایرانی در منطقه قلعه گل شهرستان خرم‌آباد مورد بررسی قرار گرفت. بدین ­منظور ابتدا با جنگل­گردشی و شناسایی جنگل­های منطقه و به روش انتخابی تعداد دو طبقه که از نظر مقدار تخریب، تخریب‌یافته و کمتر- تخریب‌یافته بودند انتخاب شد و سپس در هر طبقه یک قطعه نمونه مربعی یک­هکتاری به ابعاد 100× 100 متر پیاده شد و قطر بزرگ و کوچک تاج برای 72 درخت شاخه‌زاد بلوط ایرانی در قطعه نمونه کمتر- تخریب­یافته و 52 درخت شاخه­زاد بلوط ایرانی در قطعه نمونه تخریب­یافته اندازه‌گیری شدند. در این بررسی از توزیع‌های آماری وایبول دو شاخصه، گاما دو شاخصه، نرمال، لگ نرمال، بتا و جانسون sb استفاده شد و نیکویی برازش توابع مورد استفاده با آزمون اندرسون-دارلینگ سنجیده شد. نتایج نشان داد درصد تاج‌پوشش در منطقه تخریب‌یافته (9/11 درصد) کمتر از منطقه کمتر­تخریب‌یافته (37 درصد) است و میانگین مساحت تاج درخت در منطقه کمتر­تخریب‌یافته (46/51 متر مربع) به­صورت معنی‌داری در سطح یک درصد بیشتر از منطقه تخریب‌یافته (89/22 متر مربع) است. بر اساس نتایج حاصل از آزمون نکویی برازش در منطقه کمتر­تخریب‌یافته، توابع جانسون sb و وایبول و در منطقه تخریب‌یافته توابع گاما و بتا مناسب‌ترین توابع برای طبقات تاج‌پوشش معرفی شدند. پژوهش حاضر نشان­دهنده تأثیر مقدار تخریب بر مساحت و توابع توزیع احتمال تاج‌پوشش درختان ‌شاخه‌زاد بلوط ایرانی ناحیه رویشی زاگرس است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the probability distribution functions of crown classes of coppice shoot ‎Brant's oak (Quercus brantii Lindl) in Middle Zagros

نویسندگان [English]

  • Peyman Amiri 1
  • javad Soosnai 2
  • Hamed Naghavi 2
  • Seyed Vahid Seyedna 3
  • Kazem Noor Mohammadi 4
1 MSc student of Forestry, Faculty of Agriculture and Natural Resources, Lorestan University, ‎Khorramabad, I. R. Iran
2 Associate Professor, Department of Forestry, Faculty of Agriculture and Natural Resources, Lorestan ‎University, Khorramabad, I. R. Iran
3 PhD in Forest Sciences, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, I. R. Iran
4 PhD student of Forest Sciences, Faculty of Natural Resources, Tarbiat Modares University, Nour, I. R. Iran
چکیده [English]

The quantitative status and probability distribution functions of crown classes of Brant's oak (Quercus brantii) stands were investigated in the Qala Gol region of Khoramabad city in this study. The number of two classes of degraded and less degraded forest was selected for this purpose by identifying the forest and obtaining samples in a selective manner, and then a square sample plot of one hectare with dimensions of 100×100 meters was planted in each class. The crown diameters of 72 coppice trees of Brant's oak in the less degraded region and 52 coppice trees of Brant's oak in the degraded area were measured. In this study, statistical distribution models such as Weibull, Gamma, Normal, Log-Normal, Beta, and Johnson Sb were utilized, and the Anderson-Darling test was used to determine the goodness of fit. The results indicated that the canopy percentage in the degraded region (11.9%) is lower than the canopy percentage in the less degraded area (37%), and the average canopy area in the less degraded stand (51.46 m2) is considerably greater (P≤ 0.01) than the canopy area in the degraded stand (22.89m2).  Based on the goodness of fit test results in the less degraded stand, the Johnson SB, Weibull, Gamma, and Beta functions were proposed as the best fit functions for the canopy classes in the degraded region, respectively. The current study demonstrates that the rate of degradation has a significant influence on the probability distribution functions of tree crown cover in coppice Brant's oak stands in the Zagros forests.

کلیدواژه‌ها [English]

  • Degradation
  • Probability distribution
  • Coppice forest

مراجع

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پژوهش و توسعه جنگل
دوره 9، شماره 1
خرداد 1402
صفحه 1-15

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