Sonya Defi Melania, Cahyo Purnomo Prasetyo

Analisis Lahan Kritis Menggunakan Sistem Informasi Geografis di DAS Bendung Kuncir Kabupaten Nganjuk

Introduction

Analisis lahan kritis menggunakan sistem informasi geografis di das bendung kuncir kabupaten nganjuk. Analisis lahan kritis menggunakan SIG di DAS Bendung Kuncir Nganjuk memetakan tutupan lahan, erosi, & kekritisan. Temukan rekomendasi konservasi vegetatif mitigasi banjir di wilayah rawan.

Abstract

Lahan kritis dan alih fungsi lahan berdampak signifikan pada peningkatan emisi gas rumah kaca (GRK) melalui deforestasi dan konversi lahan pertanian, yang memengaruhi suhu lokal dan pola curah hujan global. Perubahan tutupan lahan juga memengaruhi albedo, keseimbangan energi, dan siklus karbon, sehingga memperparah perubahan iklim. Hal ini berkontribusi pada peningkatan frekuensi dan intensitas banjir, termasuk di Kabupaten Nganjuk, yang sering mengalami banjir musiman akibat luapan Sungai Kuncir, tingginya curah hujan, dan longsoran tebing. Penelitian ini memetakan tutupan lahan, kemiringan lereng, bahaya erosi, dan tingkat kekritisan lahan di DAS Bendung Kuncir, Kecamatan Ngetos, Kabupaten Nganjuk, untuk mendukung konservasi dan mitigasi bencana. Menggunakan metode deskriptif kuantitatif, penelitian ini menganalisis data spasial berdasarkan Peraturan Dirjen PDASHL Nomor P.3/PDASHL/SET/KUM.1/7/2018, dengan verifikasi melalui citra satelit dan observasi lapangan. Hasilnya menunjukkan lahan didominasi hutan tanaman dan lahan pertanian kering, dengan kemiringan kurang dari 15% serta bahaya erosi ringan hingga sedang. Lahan kritis mencapai 917,55 hektar (12% wilayah) akibat rendahnya tutupan kanopi di beberapa area. Konservasi dengan metode vegetatif, peningkatan embung, dan penanaman tanaman keras direkomendasikan untuk mengurangi risiko banjir musiman, memberikan data penting bagi pengambilan keputusan konservasi DAS di Kabupaten Nganjuk.

Review

This study presents a timely and relevant analysis of critical land in the Kuncir Dam Watershed, Nganjuk Regency, utilizing Geographic Information Systems (GIS). Addressing the significant impacts of land degradation, deforestation, and land-use change on climate change and local disaster susceptibility, the research effectively aims to map critical land areas to support conservation and disaster mitigation efforts. The application of a quantitative descriptive method combined with spatial data analysis, guided by established national regulations (Peraturan Dirjen PDASHL Nomor P.3/PDASHL/SET/KUM.1/7/2018), provides a structured and policy-relevant approach to the problem. The study's focus on a region frequently affected by seasonal floods underscores its practical importance and potential for immediate local impact. The methodology employed in mapping land cover, slope, erosion hazard, and land criticality is robust, incorporating verification through satellite imagery and field observations, which enhances the reliability of the findings. Key results indicate that the study area is predominantly covered by planted forests and dry agricultural land, with gentle slopes (less than 15%) and mostly light to moderate erosion hazards. Despite these seemingly benign conditions, a significant portion of the land, totaling 917.55 hectares (12% of the total area), is identified as critical, primarily attributed to low canopy cover in specific areas. The clear identification of critical land extent and its primary cause provides a strong foundation for the proposed conservation recommendations, which include vegetative methods, increased retention ponds (embung), and the planting of perennial crops to mitigate flood risks. While the abstract clearly outlines the methodology and results, the full paper would benefit from a more detailed exposition of how the specific criteria within Peraturan Dirjen PDASHL Nomor P.3/PDASHL/SET/KUM.1/7/2018 were applied and weighted to determine land criticality. Further, a deeper discussion on the socio-economic implications and feasibility of implementing the proposed conservation strategies within the local community context would add considerable value. Given the abstract's initial emphasis on the broader impacts of land degradation on greenhouse gas emissions, albedo, and the carbon cycle, the paper could also explore how these local findings and proposed interventions might contribute to or be scaled up for broader climate change mitigation efforts. Overall, this research provides valuable spatially-explicit data and practical recommendations, making a significant contribution to informed decision-making for watershed conservation in Kabupaten Nganjuk.

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