تأثیر عملیات پرورشی بر رویش درختان شاخه‌زاد برودار (Quercus brantii Lindl.) (پژوهش موردی: جنگل چگنی خرم‌آباد)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 کارشناس ارشد پژوهش، بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی لرستان

2 دانشیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور

چکیده

پژوهش پیش‌رو در بخشی از جنگل‌های شاخه‌زاد برودار (Quercus brantii Lindl.) منطقه چگنی خرم‌آباد با استفاده از عملیات پرورشی تنک‌کردن به‌منظور کاهش رقابت بین جست‌ها در یک جست‌گروه و با هدف انتقال پتانسیل رویشی بر جست‌های برتر انجام شد. این پژوهش برای یک بازه زمانی 16ساله در قالب طرح بلوک‌های کامل تصادفی با چهار تیمار و چهار تکرار طراحی شده است که در این مقاله نتایج چهارساله اول آن ارایه شده است. تیمارهای تنک‌کردن شامل تیمارهای سبک، متوسط و سنگین بودند که در سال اول در این تیمارها به‌ترتیب 10، 20 و 30 درصد سطح مقطع جست‌گروه‌ها تنک شدند و تیمار چهارم بدون تنک‌‌کردن به‌عنوان شاهد درنظر گرفته شد. در هر جست‌گروه هرساله قطر در ارتفاع نیم‌متر، ارتفاع جست‌ها و دو قطر عمود بر هم جست‌گروه‌ها اندازه‌گیری شد. در پایان چهار سال، با محاسبه رویش‌های قطری و ارتفاعی جست‌ها و همچنین رویش قطر و سطح تاج جست‌گروه‌ها به‌تفکیک تیمار، تأثیر تنک‌کردن بر رویش درختان بررسی و بهترین تیمار مشخص شد. نتایج به‌دست‌آمده نشان داد که تیمار تنک‌کردن سنگین نسبت به تیمارهای دیگر تأثیر مثبت بیشتری بر متغیرهای رویشی درختان داشته است و باعث بهبود ساختار توده جنگلی شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of thinning on growth of coppice Brant`s oak (Quercus brantii Lindl.) trees (Case study: Chegeni forest of Khorramabad)

نویسندگان [English]

  • Dariush Mehdifar 1
  • Mehdi Pourhashemi 2
  • Reza Karamian 1
1 Research Expert, Research Division of Natural Resources, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO
2 Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO)
چکیده [English]

As the first phase of a 16-year project, this research was carried out in a section of coppice Brant`s oak (Quercus brantii Lindl.) trees in Chegeni, Khorramabad, Lorestan province. We assessed the effect of different thinning treatments on growth of Brant`s oaks during a 4-year period. Three treatments with 3 replications were used including heavy (decreasing 30 percent of basal area), medium (decreasing 20 percent of basal area) and light (decreasing 10 percent of basal area) thinnings. One treatment was considered as control with no intervention. Quantitative characteristics of sample trees were measured prior to thinning. The measurements were repeated during 4 years to calculate the growth values. Based on results, heavy thinning had considerably positive impact on growth of diameter, height and basal area of sprouts as well as on growth of sprout-clumps crown area. It is concluded that thinning operations can improve the unsustainable structural characteristics of young coppice stands within Zagros forests.

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