تأثیر خصوصیات خاک در خشکیدگی درختان بلوط (‏Quercus brantii Lindi.‎‏) و بررسی پاسخ‌های ‏‏اکوفیزیولوژیک این گونه به درجات مختلف خشکیدگی (پژوهش موردی: منطقة دادآباد در استان لرستان)‏

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری جنگل‌شناسی و اکولوژی جنگل، دانشکدة کشاورزی و منابع طبیعی، دانشگاه لرستان، خرم‌آباد، ایران

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

3 دانشیار، گروه علوم باغبانی، دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان، خرم‌آباد، ایران

4 دکتری جنگلداری، اداره کل منابع طبیعی و آبخیزداری استان فارس، شیراز، ایران

چکیده

برای بررسی ارتباط خصوصیات فیزیکی و شیمیایی خاک و همچنین ویژگی‌های فیزیولوژیکی درختان بلوط در ارتباط با پدیده خشکیدگی، تعداد 30 قطعه‌نمونه مربعی به روش منظم تصادفی به مساحت 2500 مترمربع و با استفاده از شبکه­ای به ابعاد 200×200 مترمربع انتخاب شدند. درصد خشکیدگی در هر قطعه‌نمونه محاسبه و نمونه­برداری از خاک و برگ درختان بلوط انجام شد. برخی از خصوصیات فیزیکی و شیمیایی خاک مانند بافت، هدایت الکتریکی، اسیدیته، وزن مخصوص ظاهری، درصد تخلخل، کربن و مواد آلی و غلظت عناصر Ca،Mg ،N ،P ، K و Na اندازه­گیری شدند. آنزیم­های پراکسیداز، کاتالاز، آسکوربات­پراکسیداز، مالون­دی­آلدهید، اسیدآمینه پرولین، کلروفیل a و b، کلروفیل کل، رنگدانه کاروتنوئید و غلظت عناصر Ca،Mg ،N ،P ،  Kو Na در برگ درختان نیز سنجش شد. مقایسه میانگین متغیرهای مورد بررسی نشان داد که بین طبقات مختلف خشکیدگی تنها از نظر نیتروژن برگ اختلاف معناداری وجود دارد. به‌طورکلی نتایج این پژوهش نشان داد که در منطقه مورد بررسی، ویژگی­های خاک ارتباط معناداری با خشکیدگی نداشته است. از طرفی قابلیت­های فیزیولوژیکی درختان نمی­تواند به­تنهایی پاسخگوی درجات خشکیدگی­های متفاوت آن­ها باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of soil properties on Oak tree dieback (Quercus brantii Lindi.) and its ‎ecophysiological ‎responses to different degrees of dieback (case study: Dadabad in ‎Lorestan Province)‎

نویسندگان [English]

  • zahra Azimnezhad 1
  • ziaedin Badehian 2
  • Abdolhossein Rezaeinejad 3
  • Shahram Ahmadi 4
1 Ph.D. student of Forest Ecology, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, I.R. Iran
2 Assistant Prof., Department of Forestry, Faculty of Agricultural and Natural Reasources, Lorestan University, Khorramabad, I.R. Iran
3 Associate Prof., Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, I.R. Iran
4 Ph.D. in forestry, Fars Natural Resources Office, Forests, Range and Watershed Management Organization, Shiraz, Iran
چکیده [English]

To investigate the relationship between some physical and chemical properties of soil and tree ecophysiological properties on dieback of Oak trees, 30 square sample plots with 2500 m2 area, in a random systematic grid (200×200) were selected. The percentage of dieback were measured in each sample plot and soil and leaves of trees were sampled. Some soil properties such as texture, electrical conductivity, acidity, bulk density, porosity, Carbon and organic matter and concentrations of Ca, Mg, N, P, K, Na were measured. Also, Peroxidase, Catalase and Ascorbate peroxidase enzymes, MDA, Proline, Chlorophyll a, b, total Chlorophyll, Carotenoid pigment and concentrations of Ca, Na, K, Mg, P and N in leaves were measured. Comparison of variable means showed that there is just significant difference in leaf nitrogen between different dieback classes. In general, the results of this study showed that the soil properties in our study area were not significantly affect on oak decline. On the other hand, the physiological capabilities of trees solely, cannot be the cause of their different dieback.

کلیدواژه‌ها [English]

  • nutrients
  • Decline
  • Physiological properties
  • soil properties
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