ى ن 􀀊 تفيؤوات سمسةوهئى روبه درياوخثكى وويثئئهه ٠ى هاقكرودرسواحل استان م (Arabic)

Changes in landward and seaward extent of mangroves in the coastal areas of the Hormozgan province. (English)

Reduced rainfall and drought occurrence by restricting the migration of mangroves to the uplands have increased the vulnerability of these ecosystems to sea level rise. Therefore, monitoring the changes in the landward and seaward extent of mangroves can provide valuable information on the response and degree of vulnerability of these ecosystems to sea level rise. The aim of this study was to investigate the trend of changes in the landward and seaward extent of mangroves along the coasts of the Hormozgan province. To this end, the mangroves in the Khamir, Tiab and Jask habitats were mapped using satellite imagery in 1986, 1998 and 2016 and changes in the landward and seaward extent of mangroves were investigated during the periods before and after 1998 (the period of occurrence of long-term droughts on the southern coasts of Iran). The results showed that in the post-1998 period, which corresponds to long periods of drought on the southern coast of Iran, the landward extent of the mangroves was reduced (222.7 ha reduction in Khamir) or the trend of development of landward extent has decreased dramatically, such that in Tiab and Jask the increase in the landward extent has decreased from 463 and 165 ha to 35 and 13 ha, respectively. In addition to the significant impact of reduced rainfall, human factors such as livestock grazing and fueling (especially for the mangroves located in Khamir), development of aquaculture and pollutants have also played an effective role in the regressing of these habitats. [ABSTRACT FROM AUTHOR]

كا هشى بارند دى و وقوع خشكذسالى با محدود كردن مهاجر'ت مانخروها به سمت خشكى، سبب افزايشى آسيبينيرى اين روها مىتواند 􀀊 ١كوسيعستمها نعسبهنن به با لا آمدن سطح آب درياها مىشود ٠ بنادراين يابشى تغيدرات دسذردهاى رو به خشكى و درياى مان عات ارزشمندى را در مورد ميزان آسيبيديرى آنها به با لا آمدن سطح آب دريا ارائه دهد ٠ هدف از يزوهشى ييشىرو دررسى روند 􀀊 اط بدين منظور، با استغاده از تعاور ♦ تغييرا'ت نعستردهاى رو به خشكى و درياى مانكروها در طول سواحل استان درا نان است ١٩٩٨ و ٢٠١۶ نقشدسازى شد و تغييرا ١ت ، ماهواره اى يوششى ط نكاروها در سه رويشكاه حمير، تياب و جاسكن در سال هاى ١٩٨۶ دعستره رو بك خشكى و رو به درياى رويشكادها در مقاطع زمانى ذكرشده بررسى شد ٠ نتايج نشان داد كه در دوره زمانى يس از سال روها كاسته 􀀊 ١٩٩٨ كه منطبق با دوره هاى بلندمد ١ت خشكن سالى در سواحل جنوبى ادران است، از وسعت دسذرههاى رو به خشكى مان ٢٧٢ هكتار كاهشى در رويشكاه خمزر(، يا آنكه روند توسعه ئستردهاى رو به خشكى رويشكاه ها كاهشى جشمكيرى / شده اسهت) ٧ داشته اسهت؛ بهطوراًىه در رويشكاه هاى تيا ١ب و جاسكن مدزان افزايشى وسعت دستره رو به خشكى به ترتيب از حدود ۴۶٣ و ١۶۵ در كنار تأرر قابل توجه ♦ هكتار در دوره ييثى از سال ١٩٩٨ به حدود ٣۵ و ١٣ هكتار در دوره يس از سال ١٩٩٨ كاهشى يافته اسهت روهاى واقع در رويشكاه خمزر(، توسعه 􀀊 كاهشى بارنددى، عوامل انعسانى همانند حر١ى دام و تهيه جوب دراى سوخنن)بهويؤه در مان ♦ آ, زل 'ررنت و آ؛د ينده ها دي ز نقشى مؤثرى در يعدى روى اين رويشكاه ها داشته اند. [ABSTRACT FROM AUTHOR]

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