Trees are significant components of ecosystems built by several widespread species. For instance, Papua forest is known to comprise abiotic and biotic elements. Also, certain plants have grown in popularity to a point where they are discovered almost everywhere. The purpose of this study, therefore, was to investigate tree diversity, distribution, and the importance of conservation. Data were collected in four locations using a total of 24 sample plots spread across Idoor, Karst, Persemaian, and Torembi, where seven, four, seven, and five plots were allocated, respectively. These forests formed a mixed natural plantation comprising 76 species from 35 families. Furthermore, Idoor and Karst generated the highest species diversity and varied significantly compared to Persemaian, while Torembi showed similarities with the other three locations. This condition formed three ecosystem communities across Persemaian, Karst, Idoor, and Torembi. Also, the composition of the dominant species showed variations at the seedling and sapling levels believed to structure the understory, while the pole and tree levels characterized the overstory. The total species status was described as critically endangered (CR) of two species, vulnerable (VU) of six species, least concern (LC) of 28 species, and data deficient (DD) species. Therefore, location management is advised to not only pay significant attention in terms of economic benefits but also ecological, including the provisions for ex-situ and in-situ conservation to support sustainable forest management.
Morfometri pada DAS merupakan ukuran kuantitatif karakteristik DAS yang terkait dengan aspek geomorfologi suatu daerah. Morfometri DAS juga digunakan untuk menyatakan keadaan jaringan alur sungai secara kuantitatif. Keadaan yang dimaksud antara lain meliputi aspek linier, aspek area dan aspek relief. Tujuan dilakukannya penelitian ini yaitu untuk mengetahui karakteristik DAS berdasarkan morfometri di DAS Muari Kabupaten Manokwari Selatan. Metode yang digunakan didapatkan dari pengolahan citra DEM-SRTM dan dipadukan dengan peta RBI melalui aplikasi ArcGIS (ArcMap 10.3). Hasil penelitian menunjukkan bahwa DAS Muari terdiri dari 5 orde sungai dengan luas DAS 78.8 km2 (7880 ha), keliling DAS 44.7 km, kerapatan drainase 2.25, frekuensi sungai 3.2, tekstur drainase 5.7, rasio lingkaran 0.50, faktor bentuk 3,29, rasio elongasi 2.05 dan rasio relief 0.4. Berdasarkan analisis morfometri, DAS Muari dikategorikan DAS sangat kecil, memiliki bentuk sungai yang memanjangdan memiliki relief yang tidak curam
<em><span>The magnetic research had been carried out in Karangsambung, Kebumen, Central Java, for eight days. The subject of this research is mapping of the anomaly of magnetic field in the survey area Budjil mountain, that will be proceed in order to interpret the contact of the rock with surroundings area. This measurement used two units of Proton precision Magnetometer (PPM) Model G-856, PPM with single sensor was used to measure diurnal variation and PPM double sensor (Gradiometer) that was used to measure the magnetic field meanwhile, GPS Garmin was used for the positioning. Magnetic data processing includes IGRF correction and diurnal variation correction. After this correction has done, contouring was made using Surfer based on the total magnetic field anomaly in order to understand the occurrence of igneous rock</span></em>
Daerah Aliran Sungai Wosi merupakan DAS yang berada di Distrik Manokwari Barat, Kabupaten Manokwari, Papua Barat. Dalam dekade terakhir, DAS Wosi telah menjadi sumber bencana bagi sebagian penduduk yang tinggal di sekitar atau di daerah hilir sungai Wosi. Ketika curah hujan tinggi, Sungai Wosi tidak dapat menampung debit aliran air, sehingga bencana banjir tidak dapat dihindarkan. Penelitian ini bertujuan untuk mengetahui karakteristik DAS Wosi, menentukan kapasitas tampung maksimum sungai dan mengevaluasi peranan atau fungsi hidrologis DAS Wosi dalam mencegah banjir. Daerah penelitian berada di Daerah Aliran Sungai Wosi Kabupaten Manokwari. Penelitian ini dimulai dengan pengumpulan data serta analisis data primer dan data sekunder. Data yang dikumpulkan berupa data curah hujan Manowkari, dimensi sungai dan data spatial tutupan lahan di DAS Wosi. Data-data tersebut kemudian digunakan untuk mengetahui karakteristik hidrologi sungai, debit puncak aliran dan kapasitas tapung maksimum sungai. Hasil yang diperoleh menunjukan bahwa pada beberapa titik pengamatan, kapasitas tampung maksimum sungai lebih kecil dari debit puncak aliran permukaan. Debit puncak ini didominasi oleh aliran permukaan yang berasal dari daerah yang tertutup semak belukar/alang-alang. Meskipun tutupannya hanya 41 % dari total luasan DAS, namum semak belukar/alang-alang telah menyumbang 48 % dari total debit air yang masuk kedalam Sungai Wosi. Hasil evaluasi menunjukan bahwa fungsi hidrologis DAS Wosi sebagai penyangga kejadian puncak hujan dan pengendali banjir saat curah hujan lebat atau ekstrim kurang berfungsi dengan baik.
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