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Hydrological function of rewetted peatlands linked to saturated hydraulic conductivity in Kubu Raya, West Kalimantan, Indonesia Mahardika, Rabbirl Yarham; Tarigan, Suria Darma; Baskoro, Dwi Putro Tejo; Lovita, Vinni; Gangga, Adi; Asyhari, Adibtya; Fatoni, Arif; Jepri, Kristoporus; Ravelle, Adzan Pandu
Journal of Degraded and Mining Lands Management Vol. 11 No. 3 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.113.5717

The hydrological function of peatlands, one of which is acting as a medium for storing and releasing water, undergoes alteration due to degradation. Saturated hydraulic conductivity (Ks) is a pivotal parameter for comprehending the hydraulic properties of peatlands. Ks plays a crucial role in the transmission and release of water influenced by other peat properties. This research examined the impact of Ks and selected peat properties, namely bulk density and available water content, to depict the hydrological function in rewetted peatlands. The study sites are rubber plantation (RB), oil palm plantation (OP), and drained secondary forest (SF). Results revealed a significantly higher Ks in OP (106.7 cm hr-1) compared to RB (19.56 cm hr-1) and DSF (15.1 cm hr-1). The hydrological function at all study sites was categorized as high, with minor degradation in OP and moderate degradation in RB and SF. Nonetheless, these findings necessitate fundamental interpretation and adjustment. The outcomes of this study can be utilized to prioritize rewetting efforts in the study sites, emphasizing the importance of prioritizing immature peat (fibric) with high Ks.

CO2 emissions of tropical peat soils under controlled groundwater table depths: A laboratory-based experiment Mahardika, Rabbirl Yarham; Anshari, Gusti Zakaria; Suryadi , Urai Edi
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6135

The groundwater table (GWT) is widely recognized as a key factor influencing CO2 emissions in tropical peatlands. However, previous studies investigating this relationship have reported diverse results. This variability likely stems from the dynamic nature of field-based groundwater conditions. To address this, our study investigated the relationship between controlled GWT and CO2 emissions in a laboratory experiment using PVC columns filled with peat soil. GWT depths were adjusted to 20 cm, 30 cm, 40 cm, 50 cm, and 60 cm within a large container filled with peat pore water. CO2 emissions were measured using an Infra Red Gas Analyzer - Environmental Gas Monitoring-4 instrument, with a closed-chamber system. Our findings revealed significant differences in CO2 emissions between treatments, except for the transition from 20 cm to 30 cm GWT. Correlation analysis showed a positive correlation (R² = 0.25). Notably, CO2 emission factor values based on average yearly emission rates displayed a substantial increase with decreasing GWT, exhibiting a strong exponential relationship (R² = 0.99).

PERTANIAN ORGANIK DENGAN AGROFORESTRI: STRATEGI PENGELOLAAN LAHAN GAMBUT YANG RAMAH LINGKUNGAN DAN BERDAYA SAING Azizu, Muhamad Noor; Mahardika, Rabbirl Yarham; Afner, Dendy Detafiano Prakasa; Hadji, Trisna Al; Sari, Nur Indah; Adha, Apritama; Iksan, Arman Nur
Jurnal Abdi Insani Vol 12 No 10 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i10.3078

Pengelolaan lahan gambut secara intensif dengan pupuk kimia dalam jangka panjang berpotensi menurunkan kesuburan tanah, mempercepat laju subsiden, dan meningkatkan kerentanan ekosistem terhadap kebakaran. Penerapan pertanian organik berbasis agroforestri menjadi alternatif strategis karena mampu memperbaiki kualitas tanah sekaligus menjaga keseimbangan ekologi. Kegiatan pengabdian kepada masyarakat ini dilaksanakan di Kabupaten Kubu Raya, Kalimantan Barat, dengan melibatkan kelompok tani sebagai mitra utama. Metode pelaksanaan meliputi sosialisasi, survei ketersediaan bahan baku pupuk organik, pelatihan pengolahan kotoran kambing dan limbah budidaya lele sebagai pupuk organik padat maupun cair, serta penerapan sistem agroforestri yang mengombinasikan tanaman tahunan dan semusim di lahan gambut. Data dikumpulkan melalui observasi partisipatif, wawancara terstruktur, serta analisis deskriptif kualitatif terhadap capaian kegiatan. Hasil menunjukkan bahwa integrasi pupuk organik dengan sistem agroforestri mampu meningkatkan pemahaman petani mengenai pentingnya pengelolaan hara berkelanjutan di lahan gambut. Pupuk organik dari kotoran kambing memiliki kandungan nitrogen, fosfor, dan kalium relatif tinggi, sedangkan air kolam lele efektif digunakan sebagai pupuk cair yang mudah diaplikasikan. Kombinasi tanaman tahunan dan semusim dalam agroforestri memperlihatkan hubungan komplementer, baik dari aspek ekologi maupun ekonomi. Kegiatan ini menyimpulkan bahwa sistem pertanian organik berbasis agroforestri di lahan gambut layak dikembangkan karena terbukti memperbaiki kualitas tanah, meningkatkan produktivitas, serta memperkuat daya saing hasil pertanian organik. Disarankan adanya penguatan kapasitas petani melalui pelatihan berkelanjutan, dukungan sarana pengolahan pupuk organik.

SOIL FAUNAL DIVERSITY AS A BIOINDICATOR OF SOIL HEALTH ACROSS DIFFERENT LAND-USE TYPES Juliano, Gian; Mahardika, Rabbirl Yarham; Hidayah, Anggraeni Nur; Mardhiah, Mira; Alayya, Nahdlia Putri; Prayudi, Haikal Caesa; Putri, Elsa Kumala; Sulistiyawati, Dita; Dirman; Sagala, Mariyetha; Gusviani, Nisa Azzahra
JTSL (Jurnal Tanah dan Sumberdaya Lahan) Vol. 13 No. 1 (2026)
Publisher : Departemen Tanah, Fakultas Pertanian, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtsl.2026.013.1.13

This study examines soil mesofauna and macrofauna as bioindicators of soil health and ecological integrity across three land-use systems: oil palm plantations, open lands, and bamboo forests. Land-use change increasingly threatens soil biodiversity and ecosystem functioning in tropical regions, where soil organisms are key to nutrient cycling, aggregation, and ecological resilience. Understanding how land use influences soil faunal communities is crucial for assessing belowground integrity. Despite their critical ecological roles, soil faunal indicators are rarely integrated into soil health assessments in tropical systems. Addressing this gap, this study compares soil mesofauna and macrofauna diversity across contrasting land uses to establish their potential as reliable bioindicators. Soil samples were collected from the surface layer (0–10 cm) using standardized coring under uniform topography, soil type, and climate. Systematic random sampling was applied, with mesofauna extracted using Berlese-Tullgren funnels and macrofauna extracted by manual hand-sorting following the TSBF method. Specimens were identified to the order level. Shannon-Wiener analysis showed that bamboo forests supported the most complex and functionally rich communities (mesofauna H′ = 1.498; macrofauna H′ = 0.309), followed by oil palm plantations and open lands. Acari and Collembola were dominant mesofauna sensitive to habitat quality, while Formicidae and Diplopoda reflected higher trophic and structural roles. Open lands exhibited low diversity and dominance of stress-tolerant taxa, indicating reduced ecological function. The integrated assessment of mesofauna and macrofauna provides a robust framework for evaluating soil health, highlighting vegetation complexity as a driver of nutrient cycling, aggregation, and microbial activity.

Pertanian Organik dengan Agroforestri: Strategi Pengelolaan Lahan Gambut yang Ramah Lingkungan dan Berdaya Saing Azizu, Muhamad Noor; Mahardika, Rabbirl Yarham; DAfner, Dendy Detafiano Prakasa; Hadjib, Trisna Al; Sari, Nur Indah; Adha, Apritama; Iksan, Arman Nur
Abdimas Galuh Vol 8, No 1 (2026): Maret 2026
Publisher : Universitas Galuh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25157/ag.v8i1.21324

Pengelolaan lahan gambut secara intensif dengan pupuk kimia dalam jangka panjang berpotensi menurunkan kesuburan tanah, mempercepat laju subsiden, dan meningkatkan kerentanan ekosistem terhadap kebakaran. Penerapan pertanian organik berbasis agroforestri menjadi alternatif strategis karena mampu memperbaiki kualitas tanah sekaligus menjaga keseimbangan ekologi. Kegiatan pengabdian kepada masyarakat ini dilaksanakan di Kabupaten Kubu Raya, Kalimantan Barat, dengan melibatkan kelompok tani sebagai mitra utama. Metode pelaksanaan meliputi sosialisasi, survei ketersediaan bahan baku pupuk organik, pelatihan pengolahan kotoran kambing dan limbah budidaya lele sebagai pupuk organik padat maupun cair, serta penerapan sistem agroforestri yang mengombinasikan tanaman tahunan dan semusim di lahan gambut. Data dikumpulkan melalui observasi partisipatif, wawancara terstruktur, serta analisis deskriptif kualitatif terhadap capaian kegiatan. Hasil menunjukkan bahwa integrasi pupuk organik dengan sistem agroforestri mampu meningkatkan pemahaman petani mengenai pentingnya pengelolaan hara berkelanjutan di lahan gambut. Pupuk organik dari kotoran kambing memiliki kandungan nitrogen, fosfor, dan kalium relatif tinggi, sedangkan air kolam lele efektif digunakan sebagai pupuk cair yang mudah diaplikasikan. Kombinasi tanaman tahunan dan semusim dalam agroforestri memperlihatkan hubungan komplementer, baik dari aspek ekologi maupun ekonomi. Kegiatan ini menyimpulkan bahwa sistem pertanian organik berbasis agroforestri di lahan gambut layak dikembangkan karena terbukti memperbaiki kualitas tanah, meningkatkan produktivitas, serta memperkuat daya saing hasil pertanian organik. Disarankan adanya penguatan kapasitas petani melalui pelatihan berkelanjutan, dukungan sarana pengolahan pupuk organik,

Groundwater controls on soil–environment variables and carbon risk in smallholder peatland agriculture of West Kalimantan, Indonesia Mahardika, Rabbirl Yarham; Fadilla, Ulfia; Azizu, Muhamad Noor; Siregar, Hummaira Hasnaya
Journal of Degraded and Mining Lands Management Vol. 13 No. 2 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.132.9773

Smallholder agriculture in Indonesia plays an essential role in sustaining local food production and rural livelihoods. However, management practices remain highly variable and frequently lack adequate environmental safeguards. Groundwater table (GWT) is a primary determinant of peat properties and processes. This study examined soil–environment interactions in Kubu Raya, West Kalimantan, under two dominant smallholder land-use systems: mixed crops (MCR) and pineapple monoculture (PNP). Measurements included key biogeochemical indicators, soil properties, and GWT risk score (SGWT) derived from nationally regulated thresholds (25 cm and 40 cm) and an upper limit of 60 cm. Statistical analysis indicated that GWT exerted a significant influence (p<0.05) on soil moisture and temperature, redox potential, and pH in both systems. However, the strength of these responses differed between land uses. SGWT analysis highlighted distinct hydrological contrasts between sites. The mean GWT at MCR (36.18 cm) lies between the 25- and 40-cm thresholds, whereas PNP (46.44 cm) exceeds both. The result showed that MCR accounted for 31.9% of the risk range above 25 cm (SGWTMCR25 = 0.3194), compared with PNP at 61.3% (SGWTPNP25 = 0.6126). When evaluated against the 40-cm threshold, MCR no longer surpasses the limit (SGWTMCR40 = 0), while PNP remains within 32.2% of the 40–60 cm risk interval (SGWTPNP40 = 0.3220). These hydrological differences correspond to higher estimated CO? emission factors in PNP and greater subsidence risk relative to MCR. The results emphasize the need for site-specific assessment to guide GWT-based peatland management for smallholders.

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