تأثیر خشک‌دارها بر تغییرات کربن آلی خاک معدنی جنگل‌های اوری (Quercus macranthera C.A. May) شمال کشور

نوع مقاله : علمی - پژوهشی

نویسندگان

1 استادیار، بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان مازندران، سازمان تحقیقات، آموزش و ترویج کشاورزی، ساری، ایران

2 دانشیار، بخش تحقیقات خاک و آب، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان مازندران، سازمان تحقیقات، آموزش و ترویج کشاورزی، ساری، ایران

3 مربی پژوهش، بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان مازندران، سازمان تحقیقات، آموزش و ترویج کشاورزی، ساری، ایران

4 دانشیار، بخش تحقیقات جنگل، مؤسسه تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران

5 دکتری جنگداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

چکیده

هدف اصلی این پژوهش تعیین مقدار اثرگذاری خشک­دارها بر ­­تغییرات مقادیر کربن آلی خاک معدنی زیر بستر آنهاست. این پژوهش در قطعات نمونه دائمی 400 مترمربعی انجام شد. در داخل هر قطعه­نمونه در بستر زیرین خشک­دارهای با ارتفاع بیش از 5/1 متر و قطر برابرسینه یا قطر میانی بیش از 5/7 سانتی­متر، تجمعات آلی حاصل از پوسیدگی بافت­های چوبی برداشت شده و بعد از کنار زدن لایه آلی مذکور، لایه معدنی خاک تا عمق 10 سانتی­متر نمونه­برداری و به محیط آزمایشگاه منتقل شد. نتایج آزمون کروسکال­والیس نشان داد که مقادیر کربن آلی خاک بستر زیرین خشک­دارهای گونه­های مختلف با انواع فرم و درجات مختلف پوسیدگی دارای تغییرات معنی­داری است. به­تبع آن، نتایج آزمون ناپارامتریک پرمانوآ دوطرفه نیز نشان داد که اثرهای متقابل فرم، گونه و پوسیدگی خشک­دارها در رویشگاه­های مورد پژوهش به­صورت جفتی بر مقادیر کربن آلی خاک معدنی بستر زیرین خشک­دارها معنی­دار نبود. نتایج آزمون اسپیرمن نیز نشان داد که مقادیر کربن آلی، عناصر غذایی و ماده آلی بین زیربستر آلی و لایه معدنی خاک خشک­دارها دارای تغییرات مستقلی از یکدیگر بود (05/0<P) و بین مقادیر کربن آلی و مقدار نیتروژن کل در لایه معدنی خاک ارتباط معنی­داری مشاهده شد (01/0>P).

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Analyses of coarse woody debris impacts on soil organic carbon variations in the Hyrcanian Caucasian oak (Quercus macranthera) forests

نویسندگان [English]

  • Ali Asghar Vahedi 1
  • Mojtaba Mahmoudi 2
  • karam ali zabihi 3
  • Mohammad Matinizadeh 4
  • mojtaba imani rastabi 5
1 Assistant Professor, Natural resources Research Department, Mazandaran Agricultural and Natural Resources Research and Education Center, AREEO, Sari, I. R. Iran
2 Associate Professor Soil and Water Department, Mazandaran Agricultural and Natural Resources Research and Education Center, AREEO, Sari, I. R. Iran
3 PhD of Forestry, Natural resources Research Department, Mazandaran Agricultural and Natural Resources Research and Education Center, AREEO, Sari, I. R. Iran
4 Associate Professor, Forest Department, Research Institute of Forests and Rangelands, AREEO, Tehran, I. R. Iran
5 PhD of Forestry, Sari Agriculture Science and Natural Resources University, Sari, I. R. Iran
چکیده [English]

One of the concerns for the executive organizations to introduce an alternative plan of rest of the Hyrcanian forests is to make decision regarding the exit of coarse woody debris (CWD) volume from the Hyrcanian forests. The research was carried out in the permanent plot with 400 m2 based on the protocols of the comprehensive research plan enacted by Agricultural research Education and Extension organization in Iran. Within each plot beneath the CWDs over than height of 1.5 m and dimensions of 7.5 cm, the organic accumulations resulted from the decay trend were sampled. Besides, the soils mineral layer up to 10 cm depth were sampled after removing the organic accumulations, and were transported to the laboratory. The results of PCA (Principal Component Analysis) showed that beneath the CWDs including higher organic accumulations, amount of the organic carbon and the nutrients were lower in the substrate soil mineral layer. Furthermore, the results of Spearman test indicated that amounts of organic carbon and nutrients in the organic and substrate mineral layers were independent of each other (P > 0.05), and amounts of the organic carbon with Nitrogen were significantly correlated (P < 0.01). Also, the results of two-way PERMANOVA test indicated that interactions of form, species and decay of the CWDs in the study sites were not significantly effective on the organic carbon under the CWDs.

کلیدواژه‌ها [English]

  • High altitude
  • Organic accumulations
  • Hyrcanian forests
  • Caucasian oak CWDs
  • Nutrients

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پژوهش و توسعه جنگل
دوره 9، شماره 3
آذر 1402
صفحه 317-334

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