تأثیر ویژگی‌های خاک بر رشد درختان تبریزی (Populus nigra) سه‌ساله در جنوب تهران

نوع مقاله : علمی- پژوهشی

نویسندگان

1 استادیار، مؤسسه تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

2 دانشیار، مؤسسه تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

چکیده

DOR: 98.1000/1735-0883.1397.26.344.73.3.1578.1606
 
در پژوهش پیش‌رو، تأثیر ویژگی‌های خاک بر مشخصات رویشی درختان تبریزی (Populus nigra 62.154) سه‌ساله در دو توده صنوبرکاری در جنوب تهران بررسی شد. در پایان فصل رویش، در هر توده سه قطعه‌نمونه نه‌تایی درخت به‌صورت تصادفی- منظم انتخاب شده و قطر برابر سینه و ارتفاع کل درختان موجود در هر قطعه‌نمونه اندازه‏ گیری شد. سپس، رویه زمینی و حجم هر اصله درخت محاسبه شد. به‌منظور بررسی وی‍ژگی‌های خاک، در هر قطعه‌نمونه سه نمونه خاک از دو عمق صفر تا 30 و 30 تا 60 سانتی‌متری برداشت شد. نتایج حاکی از آن بود که خاک دو توده از نظر برخی ویژگی‌ها (بافت، پتاسیم و EC) تفاوت‌های معنی‌داری داشتند که پیرو آن مشخصه­ های رویشی درختان بین دو توده نیز تفاوت‌های معنی‌داری را نشان دادند، به‌طوری­‌که میانگین حجم سرپای تک‌درخت تبریزی ‏سه‌ساله در توده اول به‌تقریب سه‌برابر آن در توده دوم بود. در کل، خاک با بافت لومی- رسی، پتاسیم قابل جذب بیشتر (mg/kg 415/16) و EC کمتر (ds/m 1/36) (توده اول) شرایط رویشی مناسب‌تری را برای صنوبرها در مقایسه با خاک با بافت لومی- سیلتی، پتاسیم قابل جذب متوسط (mg/kg 219/43) و EC بیشتر (ds/m 4/43) (توده دوم) فراهم کرده بود. همچنین، همبستگی مثبت بین مشخصات رویشی درختان صنوبر با درصد شن و رس و پتاسیم خاک و همبستگی منفی با درصد سیلت و EC خاک در هر دو توده مشاهده شد. یافته‌های این پژوهش نشان داد که توجه به ویژگی‌های خاک پیش از صنوبرکاری برای دست‌یابی به حداکثر تولید چوب در واحد سطح ضروری است.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of some soil properties on growth of three-year black poplar (Populus nigra L.) trees in poplar plantations in south of Tehran

نویسندگان [English]

  • Azadeh Salehi 1
  • Mohsen Calagari 2
  • Fatemeh Ahmadloo 1
1 Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
2 Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
چکیده [English]

The effects of some soil properties on growth of three-year poplars (Populus nigra L.) were investigated in two poplar stands in south of Tehran. For this purpose, at the end of growth period, in each poplar stand, three sample plots (3×4 m) were chosen using technique of systematic random sampling. Diameter at breast height and height parameters of trees were measured and then basal area and volume computed. In order to study soil properties (texture, organic matter, pH, EC and NPK), in each plot, three soil samples were taken in depths of 15-30 and 30-60 cm. Results demonstrated that some soil properties (sand, silt and clay percent, K content and EC) of two poplar stands had significant differences, as a consequence growth parameters of two poplar stands also showed significant differences. So that, in stand 1 volume of three-year poplar tree was 3 times volume in stand 2. In general, loamy-clay soil with higher absorbable K (415/16 mg/kg) and lower EC (1/36 ds/m) (stand 1) provided better growth conditions for poplar trees compared with loamy-silty soil with medium absorbable K (219/43 mg/kg) and higher EC (4/43 ds/m) (stand 2). Also, positive correlation between growth parameters of poplar trees with sand and clay percent and K content and negative correlation with silt percent and EC were observed. The results of current study demonstrated that attention to soil properties before poplar plantation is necessary to achieve maximum wood production.

کلیدواژه‌ها [English]

  • Growth parameters
  • P. nigra
  • Soil salinity
  • soil texture
  • wood farming

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