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ارزیابی شاخصهای تنوع زیستی طی چهار سال در منطقه بگعان استان خوزستان | ||
| تحقیقات مرتع و بیابان ایران | ||
| مقاله 16، دوره 28، شماره 3، مهر 1400، صفحه 593-604 اصل مقاله (598.95 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijrdr.2021.125023 | ||
| نویسندگان | ||
| مهری دیناروند* 1؛ کوروش بهنام فر1؛ عبدالحسین آرامی2؛ سجاد عالی محمودی سراب2؛ کهزاد حیدری2 | ||
| 1استادیار پژوهشی، بخش تحقیقات جنگلها و مراتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان خوزستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، اهواز، ایران | ||
| 2پژوهشگر و ناظر مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران | ||
| چکیده | ||
| مطالعه پوشش گیاهی و اندازهگیری شاخصهای تنوع ابزار مناسبی برای مطالعه وضعیت پوشش جنگلها و مراتع و ارزیابی آنهاست. این پژوهش با هدف ارزیابی روند تغییرات پوشش گیاهی طی چهار سال متوالی در دو فصل در منطقه بگعان انجام شد. بدینمنظور تعداد 5 ترانسکت 100 متری با فواصل 50 متری در منطقه مورد مطالعه بهصورت تصادفی سیستماتیک در نظر گرفته شد. در امتداد ترانسکتها جمعاً 30 پلات یک مترمربعی ثابت نصب گردید. در دو فصل رویشی بهار و پاییز طی سالهای 1396 تا 1399 نوع و درصد پوشش گونههای بومی برداشت شد. با استفاده از نرمافزارPAST و R شاخصهای غالبیت، یکنواختی و تنوع گونهای سیمپسون، شانون و هیل اندازهگیری شد. نتایج تجزیه واریانس یکطرفه در بهار سالهای 1396 تا 1399 نشان داد که میان میانگین شاخصهای درصد پوشش، غالبیت و شاخصهای تنوع سیمپسون و شانون در سالهای متوالی برداشت اختلاف معنیداری وجود دارد. در پاییز به غیر از شاخص غالبیت در سایر شاخصها طی پاییز سال 1398 نسبت به سال 1397، اختلاف معنیداری وجود داشت. از نتایج ذکرشده نتیجهگیری میشود، با وجود برگشت تعدادی گونه یکساله یا کوتاهزی مانند Bienertia cycloptera Bunge وSalsola jordanicola Eig. در پی آبیاری نهالهای کشت شده و بارندگی، منطقه مورد مطالعه همچنان حساس و شکننده بوده و تا احیای مناسب نیاز به مدیریت و قرق دارد. | ||
| کلیدواژهها | ||
| آتریپلکس؛ شاخص تنوع سیمپسون؛ شاخص تنوع شانون؛ نهالکاری؛ درصد پوشش گیاهی | ||
| عنوان مقاله [English] | ||
| Evaluation of biodiversity indices during four years in Bagan region of Khuzestan province | ||
| نویسندگان [English] | ||
| Mehri Dinarvand1؛ Kourosh Behnamfar1؛ Abdolhosein Arami2؛ Sajad Alimahmoudi Sarab2؛ Kahzad Heidari2 | ||
| 1Assistant Professor, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ahvaz, Iran | ||
| 2Researcher in Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ahvaz, Iran | ||
| چکیده [English] | ||
| The study of vegetation and the measurement of diversity indices are suitable tools for studying the status of forests and rangelands and evaluating them. The purpose of this study is to evaluate the trend of vegetation changes during four consecutive years and in two seasons in the Bagan region. For this purpose, 5 transects of 100 meters with distances of 50 meters in the study area were considered systematically randomly. A total of 30 plots of one fixed square meter were installed along the transects. In two growing seasons, spring and fall, from 2017 to 2020, the type and percentage of cover of native species were harvested. Dominance, uniformity and diversity of Simpson, Shannon and Hill species were measured using PAST and R software. The results of one-way analysis of variance (ANOVA) showed that there is a significant difference between the mean of dominance, Shannon and Simpson indices, percentage of cover, and the number of species in the spring of different harvest years. In fall, except for the dominance index in other indices during July 2019 compared to 2018, there was a significant difference. From the results, it can be concluded that despite the return of some annual or short-lived species such as Bienertia cycloptera Bunge and Salsola jordanicola Eig. following irrigation of cultivated seedlings and rainfall, the study area is still sensitive and fragile and needs to be managed and confined until proper rehabilitation. | ||
| کلیدواژهها [English] | ||
| Atriplex, Simpson diversity index, Shannon diversity index, seedling, vegetation percentage | ||
| مراجع | ||
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