Nining Wahyuningrum
Badan Penelitian dan Pengembangan Teknologi Pengelolaan DAS Surakarta

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THE POTENTIAL OF FOREST BUFFER TO PREVENT STREAM FROM WATER POLLUTANTS:A CASE STUDY IN GROJOKAN SEWU SUB-WATERSHED, KARANGANYAR DISTRICT, CENTRAL JAVA Wahyuningrum, Nining; Pramono, Irfan Budi
Indonesian Journal of Forestry Research Vol 10, No 2 (2013): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

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Abstract

Population growth leads to water scarcity in terms of both quality and quantity. Agricultural and urban watersheds potentially produce more pollutantsthan forested area. It is considered that forested area has potential in storing and protecting water supply in such a way that water distribution and quality can be guaranteed. The objective of  the study was to determine the relationship between the percentages of forested area in a watershed with the water quality. Thestudy was conducted in 2010in GrojokanSewu Sub-watershed, Karanganyar District, Central Java. Using GIS (Geographic Information System), this sub-watershedwas divided into four sub-sub-watershedswith different percentages of forested areas. Water samples were collected in each sub-sub-watershedto find out the relationship between the forested area and the total dissolvedsolids, turbidity, sodium, nitrite, nitrate, sulfate and organic matters. The statistical analysis indicates relationships in quadratic form between sodium, nitrite, TDS, sulfate and organic matters with the percentage of  forested area (R2=0.99, R2=0.99, R2=0.98, R2=0.95 and R2=0.77, respectively). The relationships are different from those of turbidity and nitrate that have low R2 (R2=0.28 and R2=0.36) values. It implies that the forested area is capable to reduce sodium, nitrite, TDS, sulfate and organic matters, and thus water pollutants can be reduced by forest formation as it can filter water through retention of sediments and nutrients.
CARBON STOCK ASSESSMENT IN PINE FOREST OF KEDUNG BULUS SUB-WATERSHED (GOMBONG DISTRICT) USING REMOTE SENSING AND FOREST INVENTORY DATA Basuki, Tyas Mutiara; Wahyuningrum, Nining
Indonesian Journal of Forestry Research Vol 10, No 1 (2013): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

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Abstract

Carbon stock in tree biomass can be quantified directly by cutting and weighing trees. It is assumed that 50% of the dry weight of biomass consists of carbon. This direct measurement is the most accurate method, however for large areas it is considered time consuming and costly. Remote sensing has been proven to be an important tool for mapping and monitoring carbon stock from landscape to global scale in order to support forest management and policy practices. The study aimed to (1) develop regression models for estimating carbon stock of pine forests using field measurement and remotely sensed data; and (2) quantify soil carbon stock under pine forests using field measurement. The study was conducted in Kedung Bulus sub-watershed, Gombong - Central Java. The derived data from Satellite Probatoire dObservation de la Terre (SPOT) included spectral band 1, 2, 3, and 4, Normalized Differences Vegetation Index (NDVI), and Principle Component Analysis (PCA) images. These data were integrated with field measurement to develop models. Soil samples were collected by augering for every 20 cm until a depth of  100 cm. The potential of  remote sensing to estimate carbon stock was shown by the strong correlation between multiple bands of SPOT (band 2 , 3; band 1, 2, 3; band 1, 3, 4; and band 1, 2, 3, 4) and carbon stock with r = 0.76, PCA (PC1, PC2, PC3) and carbon stock with r = 0.73. The role of pine forest to reduce CO2 in the atmosphere was demonstrated by the amount of carbon in the tree and the soil. Carbon stock in the tree biomass varied from 26 to 206 Mg C ha-1 and in the soil under pine forest ranged from 85 to 194 Mg C ha-1.
THE POTENTIAL OF FOREST BUFFER TO PREVENT STREAM FROM WATER POLLUTANTS:A CASE STUDY IN GROJOKAN SEWU SUB-WATERSHED, KARANGANYAR DISTRICT, CENTRAL JAVA Wahyuningrum, Nining; Pramono, Irfan Budi
Indonesian Journal of Forestry Research Vol 10, No 2 (2013): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2013.10.2.101-109

Abstract

Population growth leads to water scarcity in terms of both quality and quantity. Agricultural and urban watersheds potentially produce more pollutantsthan forested area. It is considered that forested area has potential in storing and protecting water supply in such a way that water distribution and quality can be guaranteed. The objective of  the study was to determine the relationship between the percentages of forested area in a watershed with the water quality. Thestudy was conducted in 2010in GrojokanSewu Sub-watershed, Karanganyar District, Central Java. Using GIS (Geographic Information System), this sub-watershedwas divided into four sub-sub-watershedswith different percentages of forested areas. Water samples were collected in each sub-sub-watershedto find out the relationship between the forested area and the total dissolvedsolids, turbidity, sodium, nitrite, nitrate, sulfate and organic matters. The statistical analysis indicates relationships in quadratic form between sodium, nitrite, TDS, sulfate and organic matters with the percentage of  forested area (R2=0.99, R2=0.99, R2=0.98, R2=0.95 and R2=0.77, respectively). The relationships are different from those of turbidity and nitrate that have low R2 (R2=0.28 and R2=0.36) values. It implies that the forested area is capable to reduce sodium, nitrite, TDS, sulfate and organic matters, and thus water pollutants can be reduced by forest formation as it can filter water through retention of sediments and nutrients.
CARBON STOCK ASSESSMENT IN PINE FOREST OF KEDUNG BULUS SUB-WATERSHED (GOMBONG DISTRICT) USING REMOTE SENSING AND FOREST INVENTORY DATA Basuki, Tyas Mutiara; Wahyuningrum, Nining
Indonesian Journal of Forestry Research Vol 10, No 1 (2013): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2013.10.1.21-30

Abstract

Carbon stock in tree biomass can be quantified directly by cutting and weighing trees. It is assumed that 50% of the dry weight of biomass consists of carbon. This direct measurement is the most accurate method, however for large areas it is considered time consuming and costly. Remote sensing has been proven to be an important tool for mapping and monitoring carbon stock from landscape to global scale in order to support forest management and policy practices. The study aimed to (1) develop regression models for estimating carbon stock of pine forests using field measurement and remotely sensed data; and (2) quantify soil carbon stock under pine forests using field measurement. The study was conducted in Kedung Bulus sub-watershed, Gombong - Central Java. The derived data from Satellite Probatoire dObservation de la Terre (SPOT) included spectral band 1, 2, 3, and 4, Normalized Differences Vegetation Index (NDVI), and Principle Component Analysis (PCA) images. These data were integrated with field measurement to develop models. Soil samples were collected by augering for every 20 cm until a depth of  100 cm. The potential of  remote sensing to estimate carbon stock was shown by the strong correlation between multiple bands of SPOT (band 2 , 3; band 1, 2, 3; band 1, 3, 4; and band 1, 2, 3, 4) and carbon stock with r = 0.76, PCA (PC1, PC2, PC3) and carbon stock with r = 0.73. The role of pine forest to reduce CO2 in the atmosphere was demonstrated by the amount of carbon in the tree and the soil. Carbon stock in the tree biomass varied from 26 to 206 Mg C ha-1 and in the soil under pine forest ranged from 85 to 194 Mg C ha-1.
PENERAPAN METODE RATIONAL UNTUK ESTIMASI DEBIT PUNCAK PADA BEBERAPA LUAS SUB DAS Pramono, Irfan Budi; Wahyuningrum, Nining; Wuryanta, Agus
Jurnal Penelitian Hutan dan Konservasi Alam Vol 7, No 2 (2010): Jurnal Penelitian Hutan dan Konservasi Alam
Publisher : Pusat Penelitian dan Pengembangan Hutan

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Abstract

Salah satu indikator kesehatan DAS adalah debit puncak. Debit puncak yang tinggi menggambarkan tingkat kerusakan suatu DAS. Beberapa DAS tidak mempunyai stasiun pengukur hidrologi sehingga data puncak banjir tidak tersedia. Model yang paling sesuai untuk penaksiran debit puncak sebaiknya diujicobakan di beberapa DAS dengan kondisi biofisk yang berbeda. Tujuan dari penelitian ini adalah untuk mendapatkan luas DAS yang paling sesuai dalam penerapan metode Rational.. Metode Rationaladalah metode penaksiran debit puncak. Metode ini dipilih karena paling sederhana dan paling banyak digunakan di beberapa tempat. Namun demikian, metode ini mensyaratkan beberapa kondisi. Jika syaratnya tidak terpenuhi maka hasilnya menjadi kurang akurat. Metode ini mengasumsikan bahwa intensitas hujan jatuh merata dalam seluruh DAS dan waktu mencapai puncak sama dengan waktu konsentrasi. Metode ini telah diterapkan di Sub DAS Tapan, Ngunut I, dan Wuryantoro dengan luasmasing-masing Sub DAS 145 ha, 596 ha, dan 1.792 ha. Hasilnya menunjukkan bahwa dibandingkan dengan hasil pengukuran, debit maksimum hasil prediksi mempunyai penyimpangan sebesar 185%, -4%,dan 645% masing-masing untuk sub DAS Tapan, Ngunut I, dan Wuryantoro. Tingginya deviasi ini disebabkan oleh  hujan yang tidak merata dalam satu DAS. Meskipun sub DAS Ngunut I mempunyai luas596 ha, namun hujannya dapat merata karena daerahnya lebih datar dibandingkan dengan sub DAS Tapan dan Wuryantoro.
APLIKASI SISTEM INFORMASI GEOGRAFIS UNTUK PERHITUNGAN KOEFISIEN ALIRAN PERMUKAAN DI SUB DAS NGUNUT I, JAWA TENGAH Wahyuningrum, Nining; Pramono, Irfan Budi
Jurnal Penelitian Hutan dan Konservasi Alam Vol 4, No 6 (2007): Jurnal Penelitian Hutan dan Konservasi Alam
Publisher : Pusat Penelitian dan Pengembangan Hutan

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Abstract

ABSTRAK Informasi tentang besarnya aliran permukaan sangat diperlukan dalam pengelolaan Daerah Aliran Sungai (DAS). Besarnya aliran permukaan dipengaruhi oleh jenis penutupan lahan, tanah, dan kelerengan. Bagian penting dari aliran permukaan adalah debit puncak (peak runoff), waktu konsentrasi, volume dan distribusinya. Parameter ini mencerminkan kondisi suatu DAS. Namun demikian, untuk mengetahui perubahan dalam suatu DAS, parameter ini harus diukur langsung sebelum dan sesudah suatu perlakuan diterapkan. Perubahan penutupan lahan adalah salah satu contoh dari perlakuan ini yang dapat merubah volume, distribusi, dan debit puncak. Tulisan ini akan membahas metode pengaplikasian Sitem Informasi Geografis (SIG) dan rumus rasional untuk mengestimasi koefisien aliran permukaan di Sub DAS Ngunut I dibandingkan dengan pengukuran langsung dengan AWLR dan perhitungan secara manual koefisien aliran permukaan dengan rumus rasional. SIG bekerja dengan cara menumpangsusunkan peta penutupan lahan, tanah,  dan  kelerengan untuk  mengestimasi koefisien aliran permukaan. Disimpulkan bahwa  SIG dapat diaplikasikan untuk mengestimasi koefisien aliran permukaan dengan penyimpangan sebesar -5,2 % dan 3,3% dibandingkan dengan pengukuran langsung. Tidak hanya estimasi besarnya koefisien aliran permukaan, SIG  juga  dapat  memperlihatkan  penyebaran  dan  pola  penyebaran  koefisien  aliran  permukaan  serta mendeteksi faktor-faktor yang mempengaruhinya. Dalam pengelolaan DAS informasi ini sangat penting dalam rangka untuk menentukan tindakan-tindakan yang tepat untuk mengendalikan aliran permukaan di unit lahan yang tepat pula.
DAMPAK KETIDAKSESUAIAN JENIS PENUTUPAN LAHAN DENGAN KELAS KEMAMPUAN PENGGUNAAN LAHAN TERHADAP EROSI Wahyuningrum, Nining; Sudira, Putu; Supriyo, Haryono; Sabarnudin, Sambas
Jurnal Wana Tropika Vol 5 No 1 (2015)
Publisher : Fakultas Kehutanan Institut Pertanian STIPER Yogyakarta

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Abstract

Land is a natural resource with a limited number so that the utilization of this resource should consider its ability to be able to produce sustainably. Inappropriate use may result in land degradation as indicated by the amount of erosion. This study aims to (1) evaluate the land use capability (LUC) classes and their conformity with the actual land use, (2) determine the impact of mismatches between the LUC classes and actual land use on erosion. Study was conducted in Tapan and Ngunut I Sub-Sub-watershed, Karanganyar District, Central Java. Universal Soil Loss Equation (USLE) was used to predict the potential erosion on the area while modified FAO method was used to analyze LUC. The results showed that the percentage of disagreement between LUC class and with actual land use in Tapan was 23% while in Ngunut was only 0.02%. The percentages of those disagreements have no effect on the magnitude of the annual erosion. Annual erosion in Tapan (15.12 tonnes / ha) is still smaller than in Ngunut I (25.63 tonnes / ha). Composition of land cover types and land management affect the amount of erosion. Cultivation of crops at dry land and land tillage during growing season in accordance with the rainy season has great contribution on erosion. Keywords : Unsuitability, land covers, LUC, erosion