Electronic Theses and Dissertation

Daerah aliran sungai (das) krueng aceh memiliki peran penting dalam menyediakan sumber daya air bagi wilayah hulu hingga hilir, namun kondisi lahannya menghadapi tekanan akibat alih fungsi lahan dan penurunan tutupan vegetasi. penelitian ini bertujuan untuk menganalisis daya dukung das krueng aceh berdasarkan dua indikator kondisi lahan, yaitu persentase lahan kritis (plk) dan persentase penutupan vegetasi (ppv), sebagai dasar evaluasi tingkat degradasi lahan dan fungsi perlindungan vegetatif terhadap kondisi biofisik das. penelitian dilakukan dengan metode analisis spasial menggunakan data citra satelit (sentinel-2) dan sistem informasi geografis (sig). tingkat kekritisan lahan dianalisis dengan mengacu pada kriteria kementerian lingkungan hidup dan kehutanan (klhk), sedangkan penutupan vegetasi dianalisis menggunakan metode normalized difference vegetation index (ndvi) yang diolah melalui perangkat lunak arcgis 10.8. kedua indikator tersebut kemudian dinilai berdasarkan kriteria peraturan menteri kehutanan ri no. p.20/menhut-ii/2014 untuk menentukan kategori dan skor daya dukung das. hasil penelitian menunjukkan bahwa luas lahan kritis dan sangat kritis di das krueng aceh adalah 14.041,82 ha atau 8,04% dari total luas das sebesar 174.618,74 ha, termasuk kategori rendah dengan skor 0,75. meskipun demikian, kelas agak kritis memiliki luasan terbesar yaitu 77.577,66 ha, yang mengindikasikan adanya potensi peningkatan degradasi lahan apabila tidak dilakukan upaya konservasi berkelanjutan. adapun hasil klasifikasi ndvi menunjukkan total luas tutupan vegetasi (kelas sedang dan tinggi) mencapai 142.925,98 ha, sehingga diperoleh nilai persentase penutupan vegetasi (ppv) sebesar 81,85% yang termasuk kategori sangat baik dengan skor 0,50. kondisi tersebut menunjukkan bahwa sebagian besar wilayah das krueng aceh, terutama di bagian hulu, masih memiliki tutupan vegetasi yang baik dan mendukung fungsi hidrologis das, sedangkan wilayah hilir di sekitar banda aceh menunjukkan tutupan vegetasi yang lebih rendah akibat konversi lahan. secara keseluruhan, kondisi lahan das krueng aceh berdasarkan kedua indikator tersebut tergolong cukup baik, namun tetap memerlukan upaya pengelolaan dan konservasi yang berkelanjutan, khususnya pada kawasan agak kritis dan wilayah hilir yang mengalami penurunan tutupan vegetasi, agar fungsi hidrologis dan ekologis das dapat dipertahankan dalam jangka panjang.

The Krueng Aceh Watershed (DAS) plays a vital role in providing water resources for upstream and downstream areas, but its land is under pressure from land conversion and reduced vegetation cover. This study aims to analyze the carrying capacity of the Krueng Aceh Watershed based on two land condition indicators: the percentage of critical land (PLK) and the percentage of vegetation cover (PPV), as a basis for evaluating the level of land degradation and the vegetative protection function of the watershed's biophysical conditions. The study was conducted using spatial analysis methods using satellite imagery (Sentinel-2) and Geographic Information Systems (GIS). Land criticality was analyzed using the criteria of the Ministry of Environment and Forestry (KLHK), while vegetation cover was analyzed using the Normalized Difference Vegetation Index (NDVI) method processed using ArcGIS 10.8 software. Both indicators were then assessed based on the criteria of the Indonesian Minister of Forestry Regulation No. P.20/Menhut-II/2014 to determine the category and score of the watershed's carrying capacity. The research results show that the area of ​​critical and very critical land in the Krueng Aceh watershed is 14,041.82 ha, or 8.04% of the total watershed area of ​​174,618.74 ha, categorized as low with a score of 0.75. However, the slightly critical class has the largest area, at 77,577.66 ha, indicating the potential for increased land degradation if sustainable conservation efforts are not implemented. The NDVI classification results show that the total vegetation cover (medium and high classes) reached 142,925.98 ha, resulting in a Percentage of Vegetation Cover (PPV) of 81.85%, categorized as very good with a score of 0.50. This condition indicates that most of the Krueng Aceh watershed area, especially in the upstream area, still has good vegetation cover and supports the watershed's hydrological function. While the downstream area around Banda Aceh shows lower vegetation cover due to land conversion. Overall, the condition of the Krueng Aceh watershed land based on these two indicators is quite good, but still requires sustainable management and conservation efforts, especially in the somewhat critical areas and downstream areas that have experienced a decrease in vegetation cover, so that the hydrological and ecological functions of the watershed can be maintained in the long term.