بررسی خصوصیات شیمیایی خاک، مقدار لاشه­‌ریزی و ورود عناصر غذایی در سه توده دست‌کاشت آزاد، پلت و ون (جنگل آموزشی– پژوهشی دارابکلا- ساری)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری

2 استادیار، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری

چکیده

در این پژوهش عناصر غذایی خاک، مقدار لاشه‌ریزی پائیزه و ورود عناصر غذایی از طریق لاشبرگ به کف جنگل و ارتباط آنها با هم در سه توده (آزاد، افرا پلت و ون) جنگل‌کاری شده در جنگل آموزشی- پژوهشی دارابکلا ساری مورد بررسی قرار گرفت. نمونه­های خاک از عمق 15-0 سانتی‌‌متری خاک برداشت و عناصر غذایی آنها مورد اندازه­گیری قرار گرفت. برای اندازه­گیری لاشه‌ریزی در فصل خزان 3 تله جمع‌آوری لاشبرگ (به ابعاد 50×50 سانتی­متر) به­طور تصادفی در هر توده قرار داده شد و جمع­آوری لاشبرگ­ها به­صورت ماهانه انجام شد. نظر به اینکه برگ درصد قابل توجهی از لاشه‌ریزی را در گونه­های مورد بررسی به خود اختصاص داده است، بنابراین نمونه‌های برگ­های خزان شده در ماه‌های مختلف فصل خزان برای اندازه­گیری محتوی عناصر غذایی به آزمایشگاه منتقل شد. عناصر غذایی خاک بجز مقدار فسفر و پتاسیم در بین گونه­ها تفاوت معناداری نشان دادند. کمترین مقدار عناصر غذایی نیتروژن، فسفر، پتاسیم، کلسیم و منیزیم در خاک گونه ون مشاهده شد. نتایج کلی لاشه­ریزی سه گونه مورد بررسی در سه ماه خزان لاشبرگ نشان داد که افرا بیشترین و ون کمترین مقدار انباشت لاشبرگ را داشته­اند. نتایج نشان داد که توده­ها توانسته­اند خواص خاک را تا حدودی تغییر دهند. یافته­های پژوهش حاضر مؤید آن است که این تغییرات با تفاوت­های مشاهده شده در مقدار بازگشت عناصر غذایی در هر توده هم‌خوانی دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Soil chemical properties, amount of litterfall and nutrients recycling into Caucasian elm, maple and ash plantation stands at Darabkola Experimental Forest Station

نویسندگان [English]

  • Sayyed Fatemeh Hashemi 1
  • Sayyed Mohammad Hojati 2
  • Sayyed Mohammad Hosseini Nasr 2
1 M.Sc. Graduated of forestry, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University
2 Assistant prof., Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University
چکیده [English]

In this experiment, soil nutrients, amount of autumn litterfall and nutrients recycling via litterfall into forest floor and their relationships to each other were studied in three stands (Elm, Maple and Ash) at Darabkola Experimental Forest of Sari Agricultural Sciences and Natural Resources University (North of I.R. Iran). Soil samples were made from 0-15 cm depth of soil surface and their chemical properties (pH, EC and the concentrations of N, P, K, Ca and Mg) were tested. Three litter traps (50×50 cm) were randomly placed in each stand and litter was collected at monthly intervals in autumn. Because leaves usually form a significant percentage of litterfall amount, they were collected from each litter-trap at different months of autumn, dried and sieved and finally analyzed. Results showed that there was significant difference (p<0.05)  between the tree species in terms of soil nutrient concentration,except P and K contents). The lowest amount of soil N, P, K, Ca and Mg belonged to Ash plantation. Overall, the greatest and the lowest amount of litterfall belonged to  Maple and Ash species, respectively. The results showed that the stands were able to change th soil properties to some extent. It might be concluded that these changes are consistent with the differences observed in respect to the recycled nutrients at each stand.

کلیدواژه‌ها [English]

  • 3 litter trap
  • recycled nutrient
  • N
  • P
  • K
  • Ca
  • Mg
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