نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار پژوهشی، بخش تحقیقات جنگلها و مراتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان خوزستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اهواز، ایران.
2 استادیار پژوهش، موسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران
3 عضو هیات علمی، موسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران
4 پژوهشگر و ناظر موسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران.
5 پژوهشگر موسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران.
چکیده
اندازهگیری تنوع و شناسایی صفات و گروههای عملکردی گیاهی منطقه و طبقهبندی آنها علاوه براینکه به شناسایی دقیق توان رویشی منطقه کمک میکند، به درک ما نسبت به عکسالعمل پوشش گیاهی منطقه به آشفتگیها و حضور احتمالی گونههای مقاوم با صفات مشابه یا مهاجم یاری میرساند. هدف از این پژوهش بررسی و ارزیابی مقدماتی وضعیت رویشی منطقه، روند تغییرات و ارزیابی توالی ثانویه پوشش گیاهی کانونهای گرد و غبار خوزستان بعد از کشت نهال به شیوههای مختلف بود. برای تحقق این هدف از شاخصهای تنوع گونهای و گروههای عملکردی (PFTs) استفاده شد. برای ارزیابی تغییرات پوشش گیاهی منطقه با پیمایش صحرایی، تعداد 15 ترانسکت 100 متری با فواصل 50 متری بصورت تصادفی- سیستماتیک انتخاب شد. با توجه به یکنواختی ترکیب گونههای گیاهی و نبود عوارض محیطی در مجموع 180 پلات ثابت به ابعاد 1 متر مربع نصب گردید. نتایج تحقیق اخیر در سه منطقه کانون گرد و غبار جنوب شرق اهواز نشان داد در مناطق انتخابی شیوههای متنوع آبیاری به همراه بارندگیها سبب تغییرات محسوسی در افزایش درصد پوشش و تعداد گونه بتدریج از سال 1396 تا 1399 گردیده است. گروههای عملکردی منطقه طویل با آبیاری سطحی (فارو) در سال 1399 نه گروه، در منطقه بگعان با آبیاری تانکری و حفر چاله با بیل مکانیکی هفت گروه و در منطقه حنیطیه با آبیاری تانکری و حفر چاله هفت گروه عملکردی قابل تشخیص بود. نتایج آنالیز T-تست نیز نشان داد بین متوسط دو مقدار همه شاخصها از جمله تنوع شانون و سیمپسون در اسفند سال 1396 و اسفند سال 1399 برای هر سه منطقه مورد بررسی اختلاف معنی داری وجود داشته و شاخصهای تنوع با افزایش تعداد گونه و درصد پوشش در منطقه، سیر صعودی داشتهاست.
کلیدواژه‌ها
عنوان مقاله [English]
Evaluation of secondary sequence of Khuzestan dust centers using functional groups (PFTs) under different seedling cultivation methods
نویسندگان [English]
- Mehri Dinarvand 1
- Mohammad Fayaz 2
- Hashem Keneshlo 3
- Kourosh Behnamfar 1
- Sajad Alimahmodi sarab 4
- farhad khaksarian 5
1 Assistant Professor., Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization(AREEO), Ahvaz, Iran
2 Assistant Prof., Research Institute of Forest and Rangelands, Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization(AREEO), Tehran, Iran
3 Academic member.Research Institute of Forest and Rangelands, Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization(AREEO), Tehran, Iran Iran.
4 Supervision and Researcher in Research Institute of Forest and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran.
5 Researcher in Research Institute of Forest and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran.
چکیده [English]
Measuring the diversity and identifying plant vegetation traits and functional groups and classifying them, in addition to helping to accurately identify the vegetative capacity of the area, helps us to understand the vegetation response of the area to disturbances and presence. Potentially resistant species with similar or invasive traits help. The purpose of this study was to investigate and evaluate the vegetative status of the region, the trend of changes and evaluation of the second sequence of dust centers in Khuzestan after planting seedlings in different ways. Functional groups (PFTs) were used. To evaluate the changes in the vegetation of the area by field survey, 15 transects of 100 meters with distances of 50 meters were systematically randomly selected (the first transect was randomly selected and the rest with a defined distance of 50 meters). Due to the uniformity of plant species composition and the absence of environmental effects, a total of 180 fixed plots with dimensions of 1 square meter (location recording with GPS device) were installed. The results of a recent study in three areas of the dust center in the southeast of Ahvaz showed that in selected areas, various irrigation methods along with rainfall will cause significant changes in the percentage of cover (frequency) and the number of species from 2017 to 2020. Functional groups in the Tovayel region with surface irrigation (Faro) In 2020, nine groups were identified, in Bagan region with tanker irrigation and hole digging with seven excavators, and in Hanitieh region with tanker irrigation and hole digging seven functional groups. The results of T-test analysis also showed that there is a significant difference between the average of the two values of all indicators, including the diversity of Shannon and Simpson in March 2017 and March 2020 for all three regions so diversity indicators raised since number of species and cover increased.
کلیدواژه‌ها [English]
- Vegetation
- Simpson Diversity Index
- Shannon Diversity Index
- Planting
- Vegetation Percentage
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