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Purwadi Purwadi
Agroteknologi, Fakultas Pertanian, Universitas Pembangunan Nasional “Veteran” Jawa Timur
Agriculture, Biological Sciences & Forestry Environmental Science

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Penentuan Kesehatan DAS Welang Sesuai Nilai Daya Dukung DAS Berdasarkan Kriteria Lahan Anindya Hayu Prameswari; Maroeto Maroeto; Purwadi Purwadi
Jurnal Solum Vol 20, No 1 (2023)
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jsolum.20.1.1-10.2023

Abstract

The availability of land is dwindling along with the high population growth rate in each part of the Welang watershed, which has resulted in the health of the Welang watershed declining. Assessment of the health of the Welang watershed based on land criteria is expected to be able to determine the ability of the Welang watershed to provide for the needs of the community around the watershed. This study aims to determine the management and the condition of the carrying capacity of the watershed in terms of land criteria. Determination of watershed health was done by assessing the value of watershed carrying capacity according to the Regulation of the Minister of Forestry of the Republic of Indonesia Number: P.61/Menhut-II/2014 concerning Monitoring and Evaluation of Watershed Management. The carrying capacity value is reviewed based on land criteria, including: a) the percentage of critical land (PCL) through the calculation of critical land area, b) the percentage of vegetation cover (PVV) through the calculation of permanent vegetation area and c) the erosion index (EI) using the USLE approach. The Welang watershed is divided into upstream, middle and downstream areas of Bromo and Arjuno,. The results show that the carrying capacity of each part of the watershed is poor to moderate. The Arjuno upstream with the highest value of 50 is classified as bad class according to the percentage of PCL of 38.44%, PVV 66.92% and IE 1.88 tons/ha/year. Upstream Bromo has a value of 47.5 which is classified as poor class according to the PCL value of 28.10%, PVV 38.44% and EI 0.15 tons/ha/year. The downstream watershed has a value of 40, which is classified as medium class according to the percentage of critical land value of 0%, PVV 2.07% and EI 0.74 tons/ha/year and middle class has the lowest value 37.5 which is classified as medium class according to the PCL value of 6.44%, PVV 15.87% and EI 0.74 tons/ha/year. Based on the high PCL values in the upstream and middle areas which are classified as high, it can be concluded that the carrying capacity value of Arjuno and Bromo watershed is classified into the poor class as a result of the PCL values in the upstream and middle areas which are classified as high.Keywords: Carrying capacity, Erosion Index, Watershed
Pendugaan Erosi di Wilayah Tengah DAS Welang Kabupaten Pasuruan Nadya Faradiba; Purwadi Purwadi; Maroeto Maroeto
Jurnal Solum Vol 20, No 1 (2023)
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jsolum.20.1.11-19.2023

Abstract

DAS Welang dengan luasan 522.89 hektar melewati wilayah administrasi Kabupaten Malang, Kabupaten Pasuruan dan Kota Pasuruan. Sejak terjadinya banjir pada tahun 2013 akibat meluapnya sungai Welang bagian hulu, DAS Welang dimasukkan ke dalam DAS kritis dan prioritas . Faktor penyebab banjir ialah meningkatnya penduduk di area bantaran sungai Welang dan eksploitasi sumber daya alam seperti pembalakan hutan yang berakibat tanah rentan terhadap erosi dan longsor sehingga berdampak pada bagian hilir. Pendugaan besarnya nilai erosi dibutuhkan dalam upaya menekan luasan tanah ter erosi.. Beberapa langkah yang dapat dilakukan adalah pendugaan erosi dengan menggunakan model perhitungan Universal Soil Loss Equation (USLE). Penelitian ini dilakukan di 5 satuan penggunan lahan yaitu sawah irigasi, tegalan, hutan, sawah tadah hujan, dan kebun campuran. Tujuan dari penelitian ini untuk mengetahui pengaruh penggunaan lahan pada wilayah tengah DAS Welang. Hasil penelitian menunjukkan bahwa nilai pendugaan erosi di daerah wilayah tengah DAS Welang memiliki nilai terkecil sebesar 0.03 ton/ha/thn pada penggunaan lahan tegalan Purwodadi dan nilai terbesar sebesar 41.97 ton/ha/thn pada penggunaan lahan Kebun Campuran Purwosari. Nilai TBE dominan sangat ringan dan ringan dengan Indeks Erosi rendah.Key words : Erosi, USLE, DAS, DAS Welang
Status Kerusakan Tanah Pada Berbagai Penggunaan Lahan Di DAS Welang Wilayah Tengah Kabupaten Pasuruan Fina Nailussa'adah; Maroeto Maroeto; Purwadi Purwadi
Jurnal Solum Vol 20, No 1 (2023)
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jsolum.20.1.29-38.2023

Abstract

Welang watershed is a watershed located in Pasuruan Regency. Welang watershed has 522.89 km2. Changes that occur in the soil due to uncontrolled use can reduce soil productivity and reduce the main function of the soil. The factor causing soil damage is the increase in population in an area that is not following its function. The measurement of the standard criteria for soil damage refers to the Regulation of the Minister of the Environment No. 07 of 2006. This study aims to assess the status of land use against soil damage. The results showed that the Welang watershed in the central region of Pasuruan Regency had a damaged status, namely lightly damaged (R.I). Redox as a limiting factor in each different land use, namely irrigated rice fields, rainfed rice fields, mixed gardens, dry fields, and forests) in Purwosari and Purwodadi sub-districts. Efforts were made to improve the damage status with redox limiting factors with the addition of organics. The addition of materials is carried out by periodic fertilization for physical, chemical, and biological improvement of the soil.Key words: Damage, Welang Watershed, Land
Karakteristik Sifat Fisik Tanah Wilayah Hulu Daerah Aliran Sungai (DAS) Rejoso Kabupaten Pasuruan Peggy Rahmawati Putri; Purwadi Purwadi; Rossyda Priyadarshini
Jurnal Solum Vol 20, No 1 (2023)
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jsolum.20.1.39-45.2023

Abstract

Watershed Characteristics (DAS) are a specific description of watersheds characterized by topography, soil type, geology, vegetation, and land use. Physical characteristics can be the primary reference in planning, implementing, and evaluating appropriate watershed management. The research was carried out from January to August 2022 in the upstream Rejoso watershed (DAS) area, consisting of Tosari and Puspo Subdistricts, Pasuruan Regency, East Java. This study aims to obtain information about physical characteristics in the upstream region of the Rejoso watershed. This study uses a survey method of five land uses in this region. Five land uses namely, potato horticultural gardens with an altitude of 1,850-2,500 masl, horticultural gardens (potato, leek, and cabbage) of 1,350-1,850 masl, and forest land use of 800-1,350 masl are found in this area. Three sampling points were determined for each land use. The results showed that the physical characteristics of the soil in the upstream Rejoso watershed varied greatly with the slope. At the study site was classified as very steep, with soil density from low to medium, soil texture dominated by sand and dust fractions with dusty clay texture class, and permeability classified as slow to medium, moderate, and low to high organic matter content.Keywords: Soil physics, upstream watershed Rejoso
Co-Authors Anindya Hayu Prameswari Fina Nailussa'adah Nadya Faradiba Peggy Rahmawati Putri Priyadarshini, Rossyda