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Analysis of the Mangrove Ecosystem Due to the Influence of Mount Bromo’s Cold Lava Material on Permata Pilang Beach, Probolinggo

100%

Muttaqin A. D. , Soemarno S. , Purnomo M. , Zakiyah U.

2024

tom Vol. 25, iss. 4

272--281

Accretion and erosion, which are natural geological phenomena in mangrove areas, provide interesting views that have implications for sustainable area management. This research aims to analyze the ecosystem that exists in the cold lava sedimentation of Mount Bromo and explore aspects of geological attraction, which is a natural factor that cannot be avoided. This study highlights several factors that contribute to mangrove ecosystem management, including water quality, level of mangrove exploitation, canopy cover. Furthermore, this study. Research found that Avicennia marina, Avicennia alba, Sonneratia alba, Sonneratia caseolaris and Rhizophora mucronate are the types of mangroves on Permata Pilang beach. The density value of 1156 ind/Ha indicates medium density. The diversity index is proven by a value of 1.39 indicating adequate productivity. Mangrove canopy cover of 72.60% indicates a medium mangrove forest condition with a density of 1000–1500 ind/Ha. The results of sediment analysis show that very fine sand is dominant, namely 40.94% of the sediment composition, while the lowest percentage is very fine mud at 0.33%. Types of mangrove vegetation such as Rhizophora sp and Avicennia alba can be found in sediments ranging from very fine sand to mud. The research results show that the water quality at Permata Pilang Beach is good. The findings show an average value of temperature, pH, dissolved oxygen (DO), and salinity of 31.7 °C; 8.5; 7.8 mg/L and 30.9 ppt. Water temperature and pH are classified as good if they range between 28–32 °C and 5.6–9.4 respectively. The ideal dissolved oxygen level in a mangrove ecosystem is between 3–7 mg/L. The recommended salinity range in mangrove ecosystems is 10–30 ppt.

Water scarcity, mountain deforestation and the economic value of water in a small-scale irrigation system: A case study in East Java, Indonesia

63%

Budiman S. A. , Rondhi M. , Khasan A. F. , Peratama B. , Rokhani R. , Suwandari A. , Ridjal J. A. , Soemarno S. , PriJono S. , Soedarto S.

Quaestiones Geographicae

2021

tom 40

nr 2

153-166

The purpose of this study was to identify the willingness of farmers to pay for small-scale irrigation (SSI) and its determinants. Additionally, this study analysed the physical water availability in the study area using 16 years’ (2004-2019) historical data of streamflow, rainfall and forest cover change. A structured questionnaire was used to collect the data from 100 farmers. A contingent valuation method was employed to elicit farmers’ willingness to pay (WTP) for irrigation water. The results show that the average WTP of farmers is US$ 215.84/ha/year. It accounts for 20% of farm revenue and is almost 20 times the water fee in large-scale irrigation systems. The study area experienced significant deforestation in the last two decades suffering a decrease of 11.72% of forest cover. It decreases the amount of stored rainwater and decreases the streamflow causing water scarcity during the dry season. Farm size, farmer income, distance to a small dam and usage of water-pump are the significant determinants. The results indicate that water scarcity caused by poor infrastructure increases the economic value of water in a SSI system.