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All Journal Agrotrop : Journal on Agriculture Science AGRITROP International Journal of Biosciences and Biotechnology Ecotrophic, Journal of Environmental Science Advances in Tropical Biodiversity and Environmental Sciences INTERNATIONAL JOURNAL OF ENVIRONMENT AND GEOSCIENCES

I NYOMAN MERIT

Fakultar Pertanian Universitas Udayana Bali

Author-ID : 2950161

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science Veterinary

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STUDI KOMUNITAS RUMPUT LAUT DI PANTAI SANUR DAN PANTAI SAWANGAN NUSA DUA BALI GALIH INDRAWATI; I WAYAN ARTHANA; I NYOMAN MERIT
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 4 No 2
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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Aims of this research are to analyze structure community population, relative population, variety domination, heterogeneous, and equality of seaweed species in Sanur and Sawangan Beach Nusa Dua.The result of the study shows that in Sanur and Sawangan Beach observed 13 related seaweed species were observed, which are: Ulva reticulata, Chaetomorpha crassa, Bornetella nitida, Halimeda macroloba, Padina australis, Sargassum binderi, Hypnea asperi, Dictyopteris sp, Gracilaria coronapifolia, Gracilaria gracilis, Acanthopora spicifera, Euchema edule, Euchema denticulatum Meanwhile, , Caulerpa racemosa, Boergesiana forbessii, Sargassum crassifolium, Gelidium sp, Turbinaria ornata, Gracilaria foliifera only observed in Sanur Beach and species of Actinotrichia fragilis, Ulva lactuca, Euchema serra, Turbinaria conoides observed in Sawangan Beach, Nusa Dua.Heterogeneous value index (H) in Sanur Beach is 0.75 – 1.87 categorized as medium category, except in station five characterized as low category. Domination index (C) is 0.10 – 0.28, where there is no dominated species. Equality index value (E) is 0.32 – 0.85 in unstable condition, except in station one is stable. In Sawangan Beach, heterogeneous indexes is 1.04 – 1.54, that spread in all stations by medium category. Domination index is 0.14 – 0.30, indicated that there is no dominant species. Equality index is 0.47 – 0.74, by stabile condition in station one, while others station is unstable. Highest relatif population in Sanur Beach is 37.63% in station three (Gracilaria foliifera). In Sawangan Nusa Dua Beach is Hypnea asperi (48.65%).Substrate analysis show that Sanur and Sawangan Beach has mud sand types. Water temperature in both research locations approximately is 28.90 C – 30.40 C, pH 7.00 – 7.80 and dissolved oxygen around 6.8mg/1-7.4mg/l.

STUDY OF RUNOFF IN UNDA WATERSHED SATRIA WAHYU 0ETOM0; Takahiro Osawa; I Nyoman Merit
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 6 No 2 (2011)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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When rain falls on the earth, it just does not sit there, it starts moving according to the laws of gravity. A portion of the precipitation seeps into the ground to replenish Earth's groundwater. Most of it flows downhill as runoff. Runoff is extremely important in that not only does it keep rivers and lakes full of water, but it also changes the landscape by the action of erosion. The purpose and objective in this study are to estimate the conditions of land cover of Unda Watershed based on the results of image processing, to estimate the monthly average runoff and discharge in outlet of Unda Watershed from 1999 to 2003. The research location is in Unda Watershed. This watershed lies in Province of Bali which has wide 233.1 km2 (23.310 Ha) (Balai Wilayah Sungai Bali-Penida). Administratively this watershed lies in 3 Regencies that are Karangasem, Klungkung and Bangli Regency. Mostly the region lies in the Karangasem Regency. In this research, the monthly rainfall data employed to generate the runoff process. Analyze of contour map from topography map obtained the watershed area, physical parameter of river and concentration time. In this research used monthly average rainf all data (from 1999 to 2003) from Pempatan, Besakih, Singarata, Sidemen, Klungkung, Telengan, Rain Gauge Station and Polygon Thiesen method employed to analyze the datas. Apart of rainfall, there are a number of site specific factors which have a direct bearing on the occurrence and volume of runoff, they are soil type, land cover and slope. The soil types in this research area are all Regosol, this soil mapping does not need to be overlayed in obtaining the land unit. Analyze of land cover was employed by Supervised Classification method. By image processing obtained land cover of Unda Watershed estimated consists of 38.129 km2 of forest area (16.357°Ai), 19.122 km2 of grassland area (8.203%), 100.991 km2 of farmland area (43.325%), 62-412 km2 of area housing (26.775%), 2.625 km2 of water area (1.126%), 4.046 km2 of cloud area (1.736%), 2.327 km2 cloud shadows (0.998%) and 3-448 km2 of stone area (1.749%). The results of runoff by Nakayasu Unit Hydrograph and Melchior Method gives quite similar patterns. The Melchior method gives higher runoff values. This method estimates total runoff while Nakayasu Unit Hydrograph estimates runoff by dividing rainfall into hours. By Nakayasu Unit Hydrograph Method showed the average of monthly average runoff were 10.61 m3/s and 18.67 m3/s by Melchior Method. The different percentage between these methods was 59.71%. By summing runoff and the baseflow obtained river discharge and the average of river discharge in this thesis was 22.63 m3/s. Observed river discharge from Water Level Recorder (WLR) Unda Dam was used in validation, the average of monthly average river discharge was 18.24 m3/s. The different percentage between these methods was 66.37%.

IDENTIFIKASI SUMBER PENCEMAR DAN TINGKAT PENCEMARAN AIR DI DANAU BATUR KABUPATEN BANGLI CoK.I.M. HANDAYANI; I Wayan Arthana; I Nyoman Merit
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 6 No 1 (2011)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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Lake Batur areas currently experiencing rapid growth with a variety of community activities. Increased community activity tends to cause pollution and disrupt the continuity of the lake water. The purpose of this study to determine the Batur Lake water quality and pollution levels. In addition to identifying sources of contaminants that exist in the vicinity of Lake Batur. Sampling was done by purposive sampling. Water samples taken at five station and at each station taken ten sub-stations that were analyzed in situ and in laboratory Lake water quality compared to quality standards in accordance with the Rules Bali Governor Number 8 of 2007. Analysis method of water pollution indexs in accordance with the Minister of Environment Number 115 in 2003. Identify source of pollution carried by record number of events, interviews and field observations. The water quality of Lake Batur showed that some parameters have exceeded the quality standard among them are BO DS (8.72 ppm), NH3 (0.86 ppm), Fe (0.61 ppm), P04 (0.36 ppm), Pb (0.04 ppm), Cu (0.70 ppm), H2S (0.007 ppm) and Cd (0.04 ppm). Water pollution index shows that the Lake Batur including light polluted with IP 1.50 to 2.82. Community activity is the source of water pollutants such as agricultural activities, settlements, tourism and fish farming activities with floating net cages (KJA). The volume of waste from the settlement activity amounted to 229,588 m3 per year and the activities of hotel and restaurant at 4595 m3 per year and the waste load of nitrogen (N) and phosphate (P) of cage culture activities amounted to 63,024 tons per year and 3372 tons per year.

Adaptive Governance System through Multi-Stakeholder Partnerships for Natural Resource Conservation in Serangan Island, Denpasar City Chori Amelia; Syamsul Alam Paturusi; I Nyoman Merit
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 13 No 1 (2019)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

This research aims to understand environmental partnerships that have built in Serangan Island, Denpasar, to understand the governance systems based on environmental partnerships in Serangan Island, Denpasar, and analyze adaptive capacity of those governance systems to changes in socioeconomic and environmental conditions in Serangan Island, Denpasar. This research is conducted in the settlements and tourism areas outside the BTID tourism area in Serangan Island, Denpasar, on December 2018 until Februari 2019, using qualitative approach is used through indepth interviews to sixteen informans, which have particular roles in natural resource conservation in Serangan Island, Denpasar, which include conservation and utilization of turtles, coral reefs, sea biota, and many types of governance and partnerships in Serangan Island. Result shows that the government and business partnerships were initiated from provision of tourism infrastructure which was developed into wider partnerships with NGOs and communities in the area of turtle conservation, while collaborative governance in the shape of community-based coastal resources management in Serangan Island. Meanwhile, adaptive co-management was developed through devolution of partial responsibility of turtle’s conservation and utilization to local communities through various deals and MoUs. Result also shows that adaptive capacity of Serangan Islanders has developed towards resilience to changes of environmental and socioeconomic conditions. Two recommendations are advised to natural resource managers in Serangan Island. Firstly, robust data collection and supervision systems needs to be developed for governance of turtles, coral reefs, and sea biota. Secondly, social learning through dialogue, reflexions, and evaluation needs to be implemented to reassess the outdated governance practices.

STUDI PERESAPAN AIR HUJAN DI KOTA DENPASAR I Ketut Suharta; Nyoman Merit; Nyoman Sunarta
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 3 No 2
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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The first aim of this research is to know the capacity of infiltration and the capacity of percolation in the area ofDenpasar city. The second things is to know how much the water of rainfall potential to be infiltrated in Denpasar city.Capacity of infiltration and capacity of percolation tested by using the double ring infiltrometer with innercylinder diameter is 30 cm and outer cylinder is 50 cm. Volume of potential infiltrated rain water calculated bymultiplied the rainfall by catchment area and coefficient of infiltration.The findings show that the capacity of infiltration is about 0.05 mm/hour to 0.211 mm/hour, and the capacity ofpercolation is about 0.125 mm/hour to 0.471 mm/hour. Potential volume of infiltration of rain water is 25,405,028.77m3/year, it mean that about 10 % of total rainfall volume, 252,560,182.68 m3/year, so about 227,155,153.91 m3/year willbe a potential to increasing the surface run off.Based on the findings the following suggestions can be made: (1) further research should be done with the dept ofpercolation test should be about 2 m, and 20 cm above the water table; (2) it is necessary to infiltrate rainwater alltogether by the community of the city of Denpasar, by using a hole of 2 m3 each 100 m2 area.

PREDIKSI EROSI, KLASIFIKASI KEMAMPUAN LAHAN DAN ARAHAN PENGGUNAAN LAHAN DI KECAMATAN BATURITI KABUPATEN TABANAN PROVINSI BALI I Wayan Suarsana; I Nyoman Merit; I Wayan Sandi Adnyana
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 10 No 2 (2016)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2016.v10.i02.p11

Land resource damage caused by the land conversion and land use without regard to principles of conservation of soil and water. The damage resulted in the erosion is very high. Changes in land use without regard to principles of conservation of soil and water is currently happening in Baturiti District. Given this research can determine the level of erosion, soil and water conservation planning, land capability classification and proposed land use in Baturiti District. Erosion prediction using USLE (Universal Soil Loss Equation) to estimate the rate of erosion and also to get an idea the determination of soil and water conservation measures appropriate to the region. Determination of the land capability classification method Arsyad (1989) is by classifying land capability to classify land capability class based on the value of the limiting factor of land that is adjusted with land capability classification criteria. Determining of the proposed land use using the scoring method by combining the slope factor of the field, the soil sensitivity of the against erosion and the intensity of daily rainfall. Soil sampling is done by taking a total of 19 soil samples from a unit of land. The prediction results on each unit of land erosion in the area showed the level of erosion is very light covering an area of 11,70 ha, mild erosion area of 5.221,56 ha, erosion was an area of 88,10 ha, severe erosion area of 616.20 ha and very severe erosion area of 2.195,39 ha. Soil and water conservation measures required on land units with erosion prediction value exceeds the value erosion that can be tolerated so that the value could be below the value erosion erosion can be tolerated. Capability classification of the land in the study area consists of land capability class II with an area of 1489,39 ha, class III area of 827,39 ha, class IV with an area of 830.15 ha, class VI area of 1.373,79 ha, class VII covering 1.453,92 ha, class VIII covering an area of 2.176,31 ha. Tutorial use of land for the forest department is directed to the protected forest area covering an area of 2.458,00 ha. Tutorial use of land outside the forest area to protected area 1079.81 ha (13,27%), a buffer zone covering an area of 1.662,31 ha, annual crop cultivation area covering an area of 844.86 ha and seasonal crops cultivation area covering an area of 2.087,97 ha.

ESTIMASI KANDUNGAN KARBON ATAS PERMUKAAN TANAH PADA HUTAN ALAM DAN HUTAN REHABILITASI MANGROVE TAMAN HUTAN RAYA NGURAH RAI BALI Made Suartana; I Nyoman Merit; I Made Sudarma
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 15 No 2 (2021)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2021.v15.i02.p07

Mangroves are ecosystems that play an important role in absorbing and storing carbon from the air, one of which is in the form of mangrove vegetation biomass. As the largest mangrove area in Bali which consists of natural and rehabilitation vegetation, Taman Hutan Raya Ngurah Rai has a large potential for high carbon content. To determine the carbon potential of mangroves in natural and rehabilitation forests, a research was conducted using the purposive sampling method based on the canopy density level which was divided into 5 categories, namely very rare, rare, moderate, dense, very dense. Based on the results of measurements and calculations, the total carbon content of Ngurah Rai Grand Forest Park is 86.521,74 tons C, consisting of natural forest content 66.857,53 tons C and rehabilitation forest 19.664,21 tons C. Above ground carbon per hectare in natural forest was not significantly different from the above ground carbon per hectare in rehabilitation forest, these results indicate that the carbon content per hectare of rehabilitation forest over 20 years old is almost close to the carbon content per hectare in natural forest. The diameter of trees and vegetation types did not significantly affect the carbon content of mangroves, these results indicate that the increase in carbon stocks in each type of vegetation in natural and rehabilitation forests is in line with diameter growth. Keywords: Biomass; Density; Diameter; Canopy.

LAND SUBSIDENCE IN SEMARANG SUPRABADEVI A.S.; Takahiro Osawa; I Nyoman Merit
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 7 No 2 (2012)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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This research aims to identify monitoring land subsidence in Semarang has been done using raster data operation of the DEM in GIS environment. Digital representation of relief of Semarang area was generated from a point map which contains elevation data. The last update of the elevation data was made using geodetic, using Global Positioning System (GPS). Decrease in land distribution is estimated from the data of GPS Geodetic years 2008-2011, in the Semarang area north, west, central, east and south. Reduction in the range of 2008-2009 reached -12.4 cm, then increased in 2009-2010 to be -20-4 cm and -10.5 cm fell back to the years 2010-2011. Decline in the face of the land in Hyderabad occurs mainly in the n01th, east, central and south of Semarang. Subsidence causing damage to infrastmcture, buildings, and results in moving tidal lowlands.damage potential economic loss is cracks in buildings and infrastmcture (roads and bridges), the number of homes that have been tilted and nearly drowned. In addition to direct losses, reduction in ground level also cause indirect losses that rob the increasingly widespread flooding in the northern region of Semarang.in 2008- 2010 June-July with a high tide occurs o.6 cm from the surface of the sea water in the area of Semarang.

ANALISIS PERUBAHAN PENGGUNAAN LAHAN DAN DAMPAKNYA TERHADAP HASIL AIR DI DAS CISADANE HULU Nilda Nilda; I Wayan Sandi Adnyana; I Nyoman Merit
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 9 No 1 (2015)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Air merupakan salah satu kebutuhan dasar yang sangat penting bagi manusia. Terdapat beberapa faktor utama penyebab perubahan sumber daya air, diantaranya adalah perubahan penutupandan pengelolaan lahan yang meningkatkan kekedapan lahan.Salah satu tujuan pengelolaan DAS adalah mencapai kondisi tata air optimal yang dapat dikenali dari sifat aliran sungai. Penelitian ini bertujuan untuk: (1) mengetahui distribusi perubahan penggunaan lahan yang terjadi di wilayah DAS Cisadane Hulu dari tahun 2003 sampai 2010; (2) mengetahui perubahan hasil air akibat distribusi perubahan penggunaan lahan. Daerah kajian penelitian adalah DAS Cisadane Hulu dengan luasan sekitar 22.288,01 ha. Penelitian dilakukan melalui dua tahap yaitu analisis perubahan penggnaan lahan dan prediksi aliran dengan model HEC-HMS. Dalam penelitian ini digunakan peta pengunaan lahan dari BIG (Badan Informasi Geospasial) tahun 2003 dan Peta Penggunaan Lahan tahun 2010 hasil interpretasi Citra ALOS. Selanjutnya kedua peta tersebut dianalisis dengan metoda tabel silang (cross tabel) untuk memperoleh data perubahan penggunaan lahan dari setiap kelas penggunaannya. Kedua data series penggunaan lahan ini digunakan sebagai input pada model prediksi debit aliran HEC-HMS. Selanjutnya dibangun juga skenario-skenario untuk melihat dampak perubahan lahan terhadap debit aliran di DAS Cisadane Hulu. Metode bilangan kurva (SCS-CN) dipilih untuk menghitung besar curah hujan efektif, yaitu dari pengurangan curah hujan bruto dengan berbagai bentuk kehilangan air (loss). Transformasi dari curah hujan efektif menjadi hidrograf aliran langsung (direct runoff) diperoleh dengan menggunakan metode hidrograf satuan SCS Curve Number. Selama kurun waktu 2003 – 2010 terjadi perubahan penggunaan lahan di DAS Cisadane Hulu. Luas Hutan bertambah 223,78 ha, pemukiman 214,78 ha, rumput/tanah kosong 85, 73 ha, dan gedung 12, 64 ha. Terjadi penguarangan luas semak belukar 225,64 ha, tegalan/ladang 145,92 ha, sawah irigasi 124, 92 ha, sawah tadah hujan 30,67 ha, dan kebun/perkebunan 9,92 ha. Hasil dari simulasi dengan menggunakan peta penggunaan lahan tahun 2010 didapatkan nilai debit puncak (Qp) sebesar 81.73 m3/detik. Nilai volume puncak (Vp) sebesar 2,310.7 mm dan Waktu Puncak (Tp) pada hidrograf aliran yang dihasilkan model terjadi pada tanggal 26 Maret 2010. Secara umum terjadi peningkatan debit puncak antara penggunaan lahan tahun 2003 dengan 2010. dari 81.22 m³/detik menjadi 81.73 m³/detik. Naiknya debit puncak disebabkan meningkatnya aliran permukaan akibat perkembangan pemukiman di DAS.Hal ini terlihat dengan meningkatnya nilai CN rata-rata dari 38.5 menjadi 39.4.Pada simulasi dengan penggunaan lahan tahun 2010 didapatkan hasil airsebesar 2.310,7 mm/tahun.Nilai ini lebih kecil dari simulasi dengan penggunaan lahan tahun 2003 yaitu 2.320,1 mm/tahun. Salah satu penyebab berkurangnya hasil air dapat dikarenakan penguapan yang meningkat akibat bertambahnya luasan hutan. (banyaknya pemanfaat air tanah disekitar DAS tersebut, baik legal maupun ilegal).

Peningkatan Produksi Pangan pada Lahan Sawah dengan Penerapan Pemupukan Hara Spesifik Lokasi (PHSL) Melalui Evaluasi Status Unsur Hara Tanah I NYOMAN SUNARTA; I NYOMAN MERIT; NI MADE TRIGUNASIH; TATIEK KUSMAWATI
Agrotrop : Journal on Agriculture Science Vol 5 No 2 (2015)
Publisher : Fakultas Pertanian Universitas Udayana

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An Increase of The Yield of Paddy Rice with Application of The Site-Specific NutrientFertilization (SSNF) through Evaluation of The Nutrient Soil Status. Agricultural landincluding paddy fields decreases every year due to land conversion and decreasing of waterresources for irrigation. However, the need for food (rice) increases simultaneously with theincreasing of population growth. Although inorganic fertilizer and improved varieties of ricehave been intensively used, however, expected rice production has not been achieved.Fertilization based on site-specific nutrient might require for solving the problems. Researchconcerning of the site-specific nutrient fertilization (SSNF) have been carried out at Megati,District of Selemadeg Timur Tabanan Regency from April to October 2015. The objective ofthe research was to find out the effects of several types of fertilization with differentcomposition on the growth and yield of rice. The treatments were Kd0P0 (without fertilizer),Kd0P1 ( without organic fertilizer ; 100 kg urea, 25 kg SP36,and 25 kg KCl ha-1), Kd0P2(without organic fertilizer ; 150 kg urea, 50 kg SP36 and 50 kg KCl ha-1), Kd0P3 (withoutorganic fertilizer; 200 kg urea, 75 kg SP36 dan 75 kg KCl ha-1), Kd1P1 ( 5 tons of organicfertilizer ha-1; 100 kg urea, 25 kg SP36,and 25 kg KCl ha-1 ), Kd1P2 ( 5 tons of organicfertilizer ha-1; 150 kg urea, 50 kg SP36 and 50 kg KCl ha-1 ), Kd1P3 (5 tons of organicfertilizer ha-1; 200 kg urea, 75 kg SP36 and 75 kg KCl ha-1 ), and SSNF (5 tons of organicfertilizer ha-1; Rainbow NPK 200 kg ha-1 and 75 kg urea ha-1). The results showed that theplant height and the highest number of productive tillers was obtained from Kd1P3 treatment.The highest yield was obtained from the SSNF treatment. The SSNF treatment produced 9.12ton dried grain ha-1.

Co-Authors Chori Amelia Clara Rosy Irawati CoK.I.M. HANDAYANI Feronika, Feronika GALIH INDRAWATI I Dewa Kadek Wira Sanjaya I Gusti Agung Lanang Widyantara I Gusti Bagus Sila Dharma I Ketut Suharta I MADE SUDARMA I Nyoman Dibia I NYOMAN SUNARTA I Wayan Arthana I WAYAN NARKA I Wayan Sandi Adnyana I Wayan Suarna I Wayan Suarsana IDA AYU ASTARINI IDA BAGUS PUTU BHAYUNAGIRI IGAG SWANDANA INDAYATI LANYA Karsun Karsun Made Antara Made Suartana Ni Made Ayu Ratna Sari NI MADE TRIGUNASIH Nilda Nilda Nuranita Naningsi Nyoman Sunarta Putu Desy Darmasusantini SATRIA WAHYU 0ETOM0 Sulastri Sulastri SUPRABADEVI A.S. Syamsul Alam Paturusi Takahiro Osawa Takahiro Osawa Takahiro Osawa TATIEK KUSMAWATI WIYANTI WIYANTI

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