The role of tropical peatlands as a fossil carbon sink and source could be a potential nature-based solution for mitigating the ongoing climatic change. The oil palm cultivation on tropical peat needs to be assessed continuously following the dynamic changes in the oil palm ecosystem, influenced by land use management. This study aims to assess soil carbon stock, the bulk density effects on soil moisture, palm growth and CO₂ flux in oil palm plantations established on very deep peat in Bintulu, Sarawak. Carbon volume was higher in the surface zone but exposed to decomposition, leading to soil organic carbon loss. The high peat soil organic matter (>93%) had contributed to high water retention capacity (576.11 ± 11.75%). The trunk diameter and height of oil palms were 51.29- 57.80 cm and 1.11-2.04 m, respectively. The CO₂ fluxes (0.64 ± 0.05 – 0.50 ± 0.03 g CO₂ m^-2 hr^-1) were insignificant between sites, likely contributed by the similar soil organic carbon and carbon stock from SAB07 (331.28 t C ha^-1) and SBU07 (315.78 t C ha^-1) under the same management practices. The measurement of CO₂ flux is recommended to be conducted in sites of diverse peat decomposition states and ecosystems to evaluate the spatiotemporal variations.

Fungsi hutan paya gambut tropika sebagai simpanan dan sumber fosil karbon berpotensi menjadi penyelesaian berasaskan alam semula jadi dalam pengekangan perubahan iklim yang berterusan. Tahap penanaman sawit di tanah gambut perlu dinilai secara berterusan berikutan perubahan dinamik sifat tanah gambut yang dipengaruhi oleh pengurusan guna tanah. Kajian ini bertujuan untuk mengukur stok karbon tanah, kesan ketumpatan pukal tanah terhadap kelembapan tanah, pertumbuhan sawit dan pelepasan CO₂ yang dijalankan di ladang sawit tanah gambut jenis sangat dalam di Bintulu, Sarawak. Isipadu karbon adalah tinggi di zon permukaan tetapi terdedah kepada pereputan yang mengurangkan kandungan karbon organik tanah. Bahan organik tanah yang tinggi (>93%) menyumbang kepada kapasiti penyimpanan air yang tinggi (576.11 ± 11.75%). Diameter batang dan tinggi sawit adalah berukuran 51.29-57.80 cm dan 1.11-2.04 m, masing-masing. Kadar pelepasan CO₂ (0.64 ± 0.05 – 0.50 ± 0.03 g CO₂ m^-2 hr^-1) tidak berbeza antara tempat kajian, berkemungkinan disebabkan oleh persamaan peratusan karbon organik tanah dan stok karbon (315.78-331.28 t C ha^-1) di bawah pengurusan ladang yang sama. Pengukuran pelepasan CO₂ disaran dilakukan di kawasan yang mempunyai kadar penguraian gambut dan ekosistem yang berlainan.