Judul: Perubahan penggunaan lahan DAS Citarum dan dampaknya terhadap suplai air irigasi (studi kasus : periode tahun 2002-2009)
Abstrak: The research used secondary data between 2002 to 2009 in PJT II Jatiluhur and Citarum-Ciliwung watershed Management Agency. Generally, this research was done in Citarum watershed area, West Java province, from August to October 2010.The research aims to investigate: 1). Land use change in Citarum watershed area; 2). Effect of land use change on water yield; 3). Changes in water yield and its impact on irrigation needs; and 4). Effect of irrigation water supply to changes in rice acreage. According to the digital citra analysis, Citarum watershed area that located above Jatiluhur dams has changed land use (450.649 ha) between 2002 and 2008. In agriculture areas land use change significantly increased from 59.76% in 2002 to 70.52% in 2008. Changes in water results continue to demonstrate the value decreases with increasing area of agriculture following the equation ym = 2987.74-0.00766887x2 (x2 is an extensive agricultural area in ha; ym is the result of water in million m3/th). Decrease in water yield has not been an adverse impact on irrigation needs, seen from an index value of the use of water in the reservoir continues to decline, resulting in increased efficiency of reservoirs. Index decreased use of water reservoirs affected by the increase in annual precipitation, so as to reduce the effects of the decline that occurred in the water. Changes in area of rice fields terjadididuga because of land conversion to non-agricultural activities that are not triggered by lack of water.
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Judul: Water Yield Analysis using Water Balance Approach in The Lower Citarum Watershed
Abstrak: Perubahan lahan skala besar dan curah hujan mampu mengubah jumlah aliran daerah aliran sungai (DAS) yang berpengaruh besar pada besar kecilnya hasil air, sehingga penelitian ini bertujuan untuk mengevaluasi pengaruh perubahan lahan dan curah hujan terhadap hasil air. Proses dilakukan dengan menganalisis perubahan lahan dalam kategori vegetasi non-vegetasi berdasarkan jenis tutupan lahan. Selanjutnya, dilakukan analisis hasil air melalui perbandingan hasil air antara tahun 2011 dan 2020. Sebelumnya, dilakukan simulasi perhitungan hasil air dengan salah satu variabelnya merupakan variabel bebas sebagai uji adanya pengaruh perubahan lahan dan curah hujan terhadap hasil air. Hasil air dihitung dengan mengurangi curah hujan dengan nilai evapotranspirasi tanaman (ETc) yang didapatkan melalui perkalian nilai evapotranspirasi standar (ET0) dengan koefisiensi tanaman (Kc). Analisis korelasi dilakukan pada setiap nilai perubahan Kc, ET0, curah hujan, dan hasil air untuk mengevaluasi seberapa besar variabel tersebut berpengaruh pada hasil air. Hasil menunjukkan bahwa vegetasi berkurang sebesar 14953 ha atau 5.7% dan hasil air rata-rata bertambah 605 mm/tahun. Uji korelasi menunjukkan nilai yang tinggi antara variabel Kc dan curah hujan dengan hasil air, yaitu sebesar –0.797 dan 0.997. Dapat disimpulkan bahwa perubahan curah hujan menjadi faktor alami, sedangkan tutupan lahan menjadi faktor antropogenik yang mampu memengaruhi hasil air., Large-scale land changes and rainfall can alter the streamflow of a watershed, significantly impacting water yield. This study aims to evaluate the influence of land changes and rainfall on water yield. The process involved analyzing land changes categorized into vegetation and non-vegetation based on land cover types. Subsequently, water yield was analyzed by comparing the water yield between 2011 and 2020. A simulation of water yield calculations was conducted, using a variable as a free variable to test the influence of land changes and rainfall on water yield. Water yield was calculated by subtracting rainfall with the crop evapotranspiration (ETc) value, obtained by multiplying the reference evapotranspiration (ET0) with the crop coefficient (Kc). Correlation analysis was conducted for each value of Kc, ET0, rainfall, and water yield to evaluate the extent to which these variables influence water yield. The results show that vegetation decreased by 14953 ha or 5.7%, and the average water yield increased by 605 mm/year. Correlation tests showed high values between the variables Kc and rainfall with water yield, which were -0.797 and 0.997, respectively. It can be concluded that changes in rainfall are a natural factor, while land cover is an anthropogenic factor that can influence water yield.
Keyword: penggunaan lahan, vegetasi, non-vegetasi, DAS Citarum Hilir

Judul: Trichomonas Gallinae Penyebab Trichomonosis Pada Unggas
Abstrak: Trichomonas gallinae adalah protozoa yang bergerak aktof dengan keempat flagella yang mempunyai layar dan pada salah satu sisinya terdapat membran seperti sirip ikan yang berombak. Spesies dari genus Trichomonas ini mempunyai arti penting pada unggas, karena dapat menyebabkan infeksi pada alat pencernaan bagian atas.
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