Mangrove ecosystem of Segara Anakan Cilacap has specific vegetation, function, and benefit. It was dominated by Rhizophora, Bruguiera, Avicennia and associate vegetation such as Nypa frutican. Stability of mangrove ecosystem can be seen by community structure, zonation and diversity of mangrove vegetation. This research aimed to analyze community structure, zonnation and diversity of mangrove vegetation in Segara Anakan Lagoon. This research used survey method with cluster sampling by stratified analysis. The Analyze of data used association analysis, zonation analysis, richnes index, and Shanon Wiener index. This Research showed that (1) Association index of seedling was dominated by index < 0.22 (lowest association) with scored 46,67 % -66.66 %, (2) Association index of sapling also was dominated by index < 0.22 (lowest association) with scored 58,33% -71.43 %, (3) Association index of tress also was dominated by index < 0.22 (lowest association) with scored 67,27 % % (4) Overlaping indeks showed Aegiceras corniculatum has high overlap toward Nypa frutican (71 %) (seedling stage) and Rhizophora apiculata to Avicennia spp (0,49) (sapling stage). (5) Zonation of mangrove showed that Zone 1 as direct connecting zone with sea which were dominated by Avicennia marina and Avicennia oficinallis. Zone 2 as the middle zone which were dominated by Rhizophora mucronata, Rhizophora apiculata, and Ceriops tagal. Zone 3 as direct connecting zone with island which were dominated by Nypa fruticans, Acanthus ilicifolius, and Sonneratia casseolaris (6) diversity index between 0.48 -1.83 (low -middle).

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CORRELATION ANALYSIS BETWEEN SEAWATER INTRUSION AND MANGROVEGREENBELT. Seawater intrusion is an entry process of seawater to land. Many factors have caused seawater intrusion from freshwater exploitation until mangrove degradation. Mangrove ecosystem is a type of forest ecosystem which has an ability to reduce seawater intrusion. This paper analyzes the estimation and prediction of seawater intrusion and correlation between widths of mangrove with seawater intrusion. The relation analysis between the width of mangrove greenbelt with seawater intrusion used an equation model to predict seawater intrusion. The research method used sampling technique, system analysis with powersim software, correlation analysis and mathematical method with trend line analysis. Results show that (1) the mangrove density in the coastal area is approximately 50 -109 trees/ha. (2) Simulation results showed seawater intrusion rate was about 0.20 km year -1 (with mangrove as a component system), but reached 0.3 -0.4 km/year (without mangrove as a component system). (3) The simulation result also showed that freshwater salinity was estimated to increase from 1.92 ppt to 4.86 ppt. (4) The relation model between seawater intrusion and mangrove greenbelt showed that correlation coefficient was 0.97 with the equation seawater intrusion (m) = 2264.9 * exp (-0.009 * the width of mangrove greenbelt (m)), the correlation of mangrove width with seawater intrusion was 0.97. (5) Avicennia marina, Avicennia alba, Rhizophora styllosa, Sonneratia alba and Sonneratia caseolaris were the mangrove species that had the best ability to reduce seawater intrusion.Keywords: Seawater intrusion, mangrove, water salinity, system analysis ANALISIS KORELASI ANTARA INTRUSI AIR LAUT DENGAN JALUR HIJAU MANGROVE. Intrusi air laut merupakan proses masuknya air laut ke daratan. Faktor-faktor yang menyebabkan terjadinya intrusi air laut diantaranya adalah pemompaan air tawar hingga kerusakan ekosistem mangrove. Ekosistem mangrove adalah suatu ekosistem yang memiliki kemampuan untuk mengurangi proses intrusi air laut. Penelitian ini menganalisis pendugaan dan prediksi intrusi air laut, hubungan antara lebar jalur hijau mangrove dengan intrusi air laut. Analisis hubungan antara lebar jalur hijau dan intrusi air laut menggunakan suatu model persamaan. Penelitian ini dibangun dengan menggunakan

Eastern part of Segara Anakan Lagoon (E-SAL) is an estuarine ecosystem to dispose industrial waste i.e. lead (Pb) containing waste. The study aims to analysis the distribution of Pb in soil, water and mangrove vegetation matrices. Several parameters including bioaccumulation factor (BAF), translocation factor (TF), leaf morphometric (the effect of Pb for mangrove vegetation) were used to estimate their impact. We developed a pre-design of mangrove zone as a model in reducing Pb cntaminantion in E-SAL. The results showed the distribution of Pb in E-SAL was 0.177 -0.233 mg/L (water), 0.320 -0.780 mg/kg (soil), 4.80-8.67 mg/kg (mangrove root), 2.48-6.96 mg/kg (mangrove stem), and 1.48-4.76 mg/kg (mangrove leaf). The scoring of BAF in mangrove vegetation had value between 22.2-40.1 and TF between 0.9-1.3. The distribution of Pb in soil depths were 8.89 mg/kg (0-50 cm) to 0.56 mg/kg (150-200 cm). The impact of Pb was 2-60 % of leaf damage on surface leafs. The mangrove zone to reduce impact of Pb in E-SAL was Rhizophora apiculata, Bruguiera sexangula, Aegiceras corniculatum and Sonneratia caseolaris as mangrove species in the first zone.

Abstract. Hilmi E, Sari LK, Cahyo TN, Muslih, Mahdiana A, Samudra SR. 2021. The affinity of mangrove species using Association and Cluster Index in North Coast of Jakarta and Segara Anakan of Cilacap, Indonesia. Biodiversitas 22: 2907-2920. The affinity of mangrove species using association and cluster index describe relationship among mangrove species. The species association and clustering explain the degree of utilization of resources and space by mangrove species. The association and cluster also describe specific species adaptation in mangrove ecosystems. This paper was aimed to analyze species affinity using association and clustering index of mangrove species. The association index used Chi-square equation and the clustered index used Euclidian distance analysis. The results showed that (i) mangrove density in Segara Anakan (166-4000 trees ha-1) > North Jakarta (220-1100 trees ha-1). (ii) Nypa fruticans, Avicennia marina, Rhizophora stylosa and Rhizophora apiculata dominated in Segara Anakan of Cilacap, and Rhizophora stylosa and Avicennia marina dominated in North Jakarta (iii) The association index had 12 pairs of negative species association and 17 pairs of positive species association, but most of mangrove vegetations had no association. (iv) mangrove ecosystem in Segara Anakan and North Jakarta had four clusters with Euclidean distance (ED score) 484 to describe cluster between Bruguiera parviflora-Bruguiera sexangula until 76430847 to describe cluster among Bruguiera gymnorrhiza, Bruguiera parviflora, Ceriops decandra, Exoecaria agallocha, Nypa fruticans, Ceriops tagal, Rhizophora stylosa, and Sonneratia caseolaris

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