بررسی عوامل مؤثر بر پوشش گیاهی در سواحل ماسه‌ای پارک ملی بوجاق، استان گیلان

نویسندگان

1 دانشگاه گیلان

2 دانشگاه مازندران

چکیده
این تحقیق در بخش سواحل ماسه ­ای پارک ملی بوجاق با مساحت 3477 هکتار انجام شد. هدف این مطالعه بررسی تنوع گونه ­ای، تعیین گروه­ های گیاهی و بررسی تأثیر متغیرهای محیطی و گونهز­ای بر وجود و یا عدم وجود گونه­زها و اجتماع آنها است. به ­این­ منظور، 52 قطعۀ نمونه در طول شش ترانسکت در منطقه استقرار یافت. در داخل قطعات نمونه نوع گونه، ضریب فراوانی- چیرگی گونه­ ها با استفاده از معیار براون- بلانکه تعیین و فرم رویشی گونه­ ها براساس سیستم رانکیه مشخص شد. از روش­ های تحلیل دو طرفۀ گونه­ های شاخص اصلاح­ شده برای تعیین گروه­ های گیاهی و تحلیل تطبیقی متعارف برای تعیین عوامل مؤثر بر گروه­ های گیاهی استفاده شد. نتایج نشان داد که چهار گروه گیاهی در منطقه حضور دارند: گروه اول Convolvulus persicus-Crepis foetida subsp. foetida، گروه دومArgusia sibirica ، گروه سوم Eryngium caucasicum-Juncus acutus و گروه چهارم Rubus sanctus. گروه اول و دوم دارای درصد بیشتری از گیاهان تروفیت­ اند و در مناطقی که خاک آن دارای درصد ماسۀ بیشتری است، گسترش پیدا کرده­ اند. گیاهان گروه سه و چهار در مناطقی با ماسه­ های تثبیت­ شده و دارای درصد لای بیشتر گسترش داشتند. نتایج تحلیل تطبیقی متعارف نشان داد که متغیرهای خاک (بافت، کربن آلی، سدیم، پتاسیم، ازت، کلسیم، منیزیم) ارتباط معنزی­داری با گروه ­های گیاهی تحت مطالعه دارد. در بین گروه­ های گیاهی درصد ماسه و لای، غنای گونه ­ای و نیز شکل­ های زیستی تروفیت و ژئوفیت روابط معنی ­داری را نشان می­ دهند. بنابراین می­ توان نتیجه گرفت که این عوامل در تفکیک و پراکنش گروه­ های گیاهی مؤثر هستند.

کلیدواژه‌ها


عنوان مقاله English

The study of factors affecting on vegetation in sand beaches of the Boujagh National Pa-rk, Guilan Province

نویسندگان English

Narges Vasefi 1
Shahriyar Saeidi Mehrvarz 1
Alireza Naqinezhad 2
Mokarram Ravanbakhsh 1
چکیده English

This paper concerns itself with the study of sand beaches of the Boujagh National Park with an area of 3477 ha. The purposes of this study include the determination of the plant species diversity and plant groups. In ad-dition, the determination of the impact of environmental and specific variables on the presence or absence of certain species and their communities is another aim that the study follows. In order to attain those purposes, 52 plots across 6 transects of the district were used. In each plot, the materials were identified and abundance-dominance of species by using Braun-Blanquet criteria were obtained and their life forms were determined according to Raunkiaer clas-sification. To determine the plant groups, a Two-way analysis of significant modified species (Modified TWINSP-AN) was utilized. Detrended Canonical Analysis (DCA) was used to determine factors affecting plant groups. The results showed that four plant groups exist in this district: Convolvulus persicus-Crepis foetida subsp. Foetida grou-p, Argusia sibirica group, Eryngium caucasicum-Juncus acutus group and Rubus sanctus group. The first and seco-nd groups consist of higher percentages of therophytes and spread in areas where the soil contains more sand. Plants in the third and fourth groups spread in areas with stabilized sand and high percentage of silt. DCA analysis results showed that soil factors (texture, OC, Na, K, N, Ca, Mg) have significant relation with plant groups were studied. Among the plant groups, the percentage of silt and sand, species richness and life forms of therophytes and geop-hytes show significant relations. Therefore it can be concluded that these factors affect on the separation and distri-bution of plant groups.

کلیدواژه‌ها English

coastal ecosystems
transects
raunkiaer
plant groups
environmental factors
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  • تاریخ دریافت 18 خرداد 1405
  • تاریخ انتشار 18 خرداد 1405