تحليل رابطه بين وقوع خثكىسالىه ٤ى هواشاسى و هيدرولوؤيتك و تفييو زى' ده جئكله 1ى هادكرو خليج سموا و در يى دوره ٣٤ ساله (Arabic)

Analysis of relationship between the meteorological and hydrological droughts and biomass change of mangrove forests in the Gwatr Port over a 34-year period. (English)

The analysis of changes in mangrove forests production capacity and its relation to the drought periods can provide valuable information on the vulnerability of these ecosystems to the adverse effects of climate change. This study investigates the effect of long-term drought occurrences on the production capacity of the mangrove forests in the Gwatr Port in the Sistan and Baluchestan province. To do this, by recording the diameter at breast height and calculating the above and below ground biomass in the sample plots and analyzing the relationship between these characteristics with the Landsat satellite images, 34-year time series (1986-2019) mangrove biomass were mapped and the relationship between biomass variations and changes in meteorological drought (measured using SPI) and hydrological drought (measured using SSFI) was analyzed. The results showed that the above and below ground biomasses follows the trends of change in the severity of meteorological and hydrological droughts during the 34-year period such that in the wet season before 1998, mangrove biodiversity increased, and then with long-term droughts after 1998, the decline in biomass continued until the end of the period. The coincidence between biomass changes and SPI and SSFI variations resulted in a high correlation between mangrove biomass variations with changes in the severity of meteorological and hydrological droughts (correlation coefficients greater than 0.82). The results of this study can be used for developing climate change adaptation programs and for the restoration and development of mangrove forests in the Sistan and Baluchestan province. [ABSTRACT FROM AUTHOR]

عا ١ت ارزشمندى 􀁱 تحليل تفيدر در توان توليدى جنكزهاى مانكرو و دررسى رابطه آن با وقوع دوره هاى خشى سالى مىتو١ذد اط در يزوهثى ييشرو< تأرر وقوع ♦ را از ميزان آسيب يددرى اين بو*اسازدانها نسبت به اذر نامطلوب ناشى از تغيي ر اقليم ارائه كند خشكه سالى هاى بلندمدت بر توان توليدى جنكل هاى مانكارو خليح نواتر در استان سيستان و بلوحستان بررسى شد. با آماريردارى و محاسبه زىتوده روزمينى و زيرزمينى اًنها در ،)Avicennia marina (Forssk Vierh.(اندركيرى طر يقه درختان حرا و تجزيه وتحليل رابطه بين اين مشخصهدها با تصاوير طهو١ره لندست، سرى زمانى ٣۴ ساله) ١٩٨۶ تا ٢٠١٩ (زىتوده 􀁬 قطعهذموذهه و)SPI درختان حرا نقشعدسازى شد. سيعس، رابطه بين تغيدرات زى توده با وقوع خشكه سالى هواشناسى)اندازه كيرىشده با استغاده از تجزيهوتحليل شد. نتايح نشان داد كه مطابق با روند تغيير شدت وقوع)SSFI خشكه سالى هيدرولوزيكه)اندازه شرىشده با استغاده از خشك<سالىهاى هواشناسى و هيدرولوزيكه، زى توده روزمينى و ر رزمينى نيز روندهاى افزايشى و كاهشى در طى دوره ٣۴ ساله داشت، بهطورىه در دوره ترسالى يي ٠ثى از سال ١٩٩٨ ، روند اقزايشى براى زى توده مشاهده شد ٠ با وقوع خشكه سالى هاى بلندمدت SP I انطباق بين روند تغييرات زى توده و تغيدرات ♦ يس از سال ١٩٩٨ ، روند كاهشى مقادير زىتوده تا سازهاى يايانى دوره ادامه ياقت سبب شد تا همبستكى زيادى بين تغييرا ١ت زى توده با تغييرا'ت شد ١ت وقوع خشكه سالى هاى هواشناسى و هيدرولوزيكه SSFI و نتايج اين يروهثى مى تواند براى تهيه برنامه هاى سازدارى با تغيير اقليم و نيز ♦)٠/ دست آيد)دريب هاى همبستكى بيشتر از ٨٢ ♦ برنامه هاى احيا و توسعه جنكلهاى ما نكرو در استان سيستان و بلوحستان استفاده شود. [ABSTRACT FROM AUTHOR]

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