بررسی ویژگی های مورفولوژیکی توده آمیخته و طبیعی ون در جنگل خیرود کنار

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری جنگلداری، دانشکدۀ منابع طبیعی، دانشگاه ارومیه، ارومیه

2 استاد، گروه جنگلداری و اقتصاد جنگل، دانشکدۀ منابع طبیعی، دانشگاه تهران، تهران

چکیده

با توجه به لزوم تحقیق روند رویش و تکامل طبیعی توده­های جنگلی مدیریت نشده و ایجاد الگوی مدیریتی مناسب و همگام با طبیعت به­منظور دخالت در توده­های جنگلی مشابه، در این پژوهش برخی از مشخصه­های یک توده طبیعی فاقد دخالت پرورشی، طی دو مرحله آماربرداری به فاصله هشت سال در جنگل خیرود کنار به روش آماربرداری صد در صد بررسی شد. نتایج بررسی نشان داد که در طول دوره، 7/9 درصد از درختان افتاده، 5/6 درصد از درختان خشک‌شده، 6/2 درصد از درختان توده خمیده و تاج 6/1 درصد از درختان توده شکسته شده است که بیشتر این درختان در طبقاتقطری پایین (10 و 20 سانتی­متری) پراکنش دارند. بررسی­های ضریب قد کشیدگی درختان در ابتدای دوره حاکی از احتمال بادافتادگی آن‌ها در آینده بود. نتایج نشان داد در توده مورد بررسی باگذشت زمان و افزایش ارتفاع درختان، ارتفاع تاج نسبت به ارتفاع تنه افزایش بیشتری پیدا می­کند. همچنین در طول زمان در اثر افزایش قطر برابرسینه درختان، افزایش ارتفاع تنه بدون شاخه نسبت به افزایش ارتفاع تنه با شاخه محسوس­تر است. تعداد درختان افتاده و خشک‌شده در توده و جایگاه این درختان در طبقات قطری، نشان‌دهنده حرکت ساختار توده از همسالی به سمت ناهمسالی است. نتایج، نیاز چنین توده­هایی را به برنامه­ریزی و دخالت­های پرورشی مانند تنک کردن، به­منظور جلوگیری از کاهش ارزش موجودی توده نشان داد.

کلیدواژه‌ها


عنوان مقاله [English]

Surveying morphological characteristics of unmanaged mixed stand in Kheiroud forest

نویسندگان [English]

  • Samira Sasanifar 1
  • Manochehr Namiranian 2
  • Nosratollah Zargham 2
1 Ph.D. Candidate of Forestry, Faculty of Natural Resources, Urmia University, Urmia, I.R. Iran
2 Professor, Department of Forestry and Economics, Faculty of Natural Resources, University of Tehran, Tehran, I.R. Iran
چکیده [English]

In this study some characteristics of an unmanaged natural stand were measured and surveyed in two sampling periods as long as eight years in Kheiroud forest. Results showed that about 9.7 percent of all trees was fallen, 6.5 percent of trees were dried, 2.6 percent of all trees were embowed and crown of 1.6 percent of trees was broken during the period. Also the most fallen trees were occurred in low diameter categories (10 and 20 cm). Slenderness coefficient studies in the first period suggest the possibility of falling the trees in the future. Results showed that there is a negative significant correlation between height of crown and total height in first period and a positive correlation between height of trunk and total height. These relations in second period are inversed. In the surveying of relationships between trunk with branches and without branches in all specie, it is determined that trunk without branches height in relation to trunk with branches is more obvious. The number of fallen and dried trees in the stand and the situation of the trees in diameters classes imply on needing of stand thinning. Otherwise, continuing of the stand destroying and increasing number of unhealthy trees will not be avoided.

کلیدواژه‌ها [English]

  • Height of crown
  • Height of trunk
  • Trunk with branches
  • Trunk without branches
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