Penelitian ini memiliki tujuan untuk : (i) mengkaji karakteristik vegetasi dan kerusakan ekosistem hutan mangrove, dan (ii) mengkaji kondisi fisik-kimia ekosistem hutan mangrove. Metode perolehan sampel menggunakan teknik purposive sampling. Data karakteristik vegetasi diperoleh melalui metode transek dan petak contoh. Data ini dijadikan acuan dalam menentukan tingkat kerusakan ekosistem mangrove. Kondisi fisik-kimia diperoleh melalui pengukuran lapangan dan analisis laboratorium.Hasil penelitian menunjukkan INP paling tinggi untuk tingkat pohon terdapat pada Xylocarpus rumphii (133,8%), yang dijumpai di Stasiun I. Spesies yang umumnya mendominasi pada tingkat pancang yaitu Sonneratia caseolaris, dengan INP 46,19% pada Stasiun III, sedangkan mayoritas spesies pada tingkat semai dan tumbuhan bawah yaitu Rhizophora mucronata, dengan INP 66,32% pada Stasiun II. Ekosistem mangrove untuk tingkat pohon termasuk dalam kategori rusak, dengan penutupan < 50% dan kerapatan < 1000 pohon/ha. Sementara, pada tingkat pancang, semai dan tumbuhan bawah, termasuk dalam kategori baik dengan kerapatan individu >1500 pohon/ha. Kondisi pH perairan dan suhu udara kurang mendukung untuk perkembangan dan pertumbuhan vegetasi mangrove, sedangkan parameter lain memiliki kondisi yang sudah sesuai.Kata kunci: ekosistem mangrove, fisik-kimia, INP, karakteristik vegetasiThis study aims to : (i) examined vegetation characteristic and the damage degree of mangrove ecosystems, (ii) examined the physical-chemical condition of mangrove ecosystems, and (iii) analyse the used of mangrove for environment and communities. This research is conducted in the surroundings mouth of Batang Manggung River, Pariaman Utara Subdistrict, Pariaman City. The sampling technique is purposive sampling. Vegetation characteristic data obtained trough line transect and plot sampling. This data is used to be reference in determine the damage degree of mangrove ecosystems. Physical-chemical data obtained trough field measured and laboratorium analysis. The results show that the value of INP at highest rate for tree level was Xylocarpus rumphii (133,8%) at Stasiun I. The most dominated species for sapling is Sonneratia caseolaris, which 46,19% of INP at Stasiun III. The seedling and herbs dominate with Rhizhophora mucronata, which 66,32% of INP at Stasiun II. The tree level include in damage category, which < 50% covered area and the density <1000 tree/ha. For sapling, seedling and herbs include in good category, which density was >1500 tree/ha. The water pH and air temperature had less support in extent and growth of mangrove, while the other parameter had suitable. Keywords: mangrove ecosystems, physical-chemical, vegetation charactersitic, IVI
The construction of PLTU can have an influence on the surrounding environmental conditions, such as air pollution. This study aims to (1) analyze the average air quality in 2013 and 2020 in Bungus Teluk Kabung District, (2) identify changes in air quality conditions in 2013 and 2020 in Bungus Teluk Kabung District. The method used is descriptive analysis with a quantitative approach. The data analysis technique to determine the average air quality uses PM10, SO2, and NOx parameters by utilizing Landsat 8 satellite imagery in 2013 and 2020 which has been radiometrically and atmospherically corrected. The average value of the parameter, can be calculated based on the air quality algorithm, and to measure changes in the state of the air quality standard, the researcher uses the Air Pollution Standard Index (ISPU). The results showed that there was an average increase in all air quality parameters. Based on ISPU the distribution of PM10 values in 2020 is in the good category with an average of 1.9 μg/m3, the SO2 value is in the medium category with an average of 63.3 ρρm, and NOx is in the unhealthy category with an average of 173.6 μg/m3. The results of the Wilcoxon difference test showed that all air quality parameters had a significant value of <0.05, meaning that there was a significant difference in air quality in Bungus Teluk Kabung District after the Teluk Sirih PLTU was built.
Changes oh land use from forest into plantations is one of the causes of increased CO2 emissions. The rapid increase in the area of oil palm plantations and the reduction in forest area in West Pasaman Regency will increase greenhouse gas emissions which have a negative impact on the preservation of the earth and its contents. The aims of this study were: to analyze land use changes of forest and oil palm plantations in 1996-2021 and to calculate the total amount of CO2 absorption and emissions caused by changes in forest land use and oil palm plantations in West Pasaman Regency. The research method used is a remote sensing method with the NDVI (normalized difference vegetation index) algorithm for Landsat satellite images. The results showed that there had been a significant change in land use, forest land had decreased by 47,396.39 ha and oil palm land had increased by 105,115.86 ha. Total emissions from changes in forest and oil palm land use are 1,009,411.6 tonnes/ha/year. It is recommended that the Government of West Pasaman Regency need to make a policy to prevent the conversion of forest land into oil palm plantation land. Changes in the use of forest land into plantations is one of the causes of increased CO2 emissions.
The purpose of this research was to analyze the land use change and identify the morphodynamics of the coastline at estuary in Batang Masang River from 2015 to 2021. These changes determined through remote sensing by utilyzing sentinel-2 satellite imagery in 2015 and 2021. Land use change known by using supervised classification with the maximum likelihood classification method. Meanwhile, to determine the morphodynamics of the coastline, doing by digitization on screen land use map based on the lowest tide from the bathymetry map. This study obtained results in form the largest change land use the addition of open land area of 27.64 ha, then followed by a reduction in forest land area of 12.26 ha, while the smallest change land use was the reduction of scrub was 7.73 ha (1.79 %). Furthermore, there was a reduction in the length of the coastline, namely 0.43 km, abrasion of 9.68 ha and accretion of 11.52 ha occurred. Thus the most dominant morphodynamics process in the Batang Masang River estuary is influenced by sea waves and river discharge.
This research was conducted in the Air Dingin watershed of West Sumatra which aim calculating changes of land cover area in Air Dingin watershed (2008 – 2021). To determine land cover changes using maximum likelihood classification by utilizing Arc Map 10.8. It can classify land cover change and Microsoft Excel software to calculate land cover change. The result shows that the landcover change of Air Dingin Watershed in 2008 - 2021 largest increase in the shrub area by 392.60 ha (3.1%) and followed by dry land agriculture which increased 215.18 ha (1.7 %), building area increased by 148.68 ha (1.2%), mixed gardens by 16.94 ha (0.1%). The increase in land area will be followed by a reduction in land cover, which has the largest decrease in forest area, namely 635.58 ha (5.0%), followed by a decrease in paddy fields of 129.25 ha (1.0%) , waters decreased by 8.57 ha (0.1%).
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