Abstract
Ground Water level fluctuation data on tropical peatland is necessary to restore the degraded peatlands as well as for peatland sustainable management. Peatland restoration always begins with groundwater level restoration (GWL). Therefore, measurement of GWL is necessary for further management. GWL fluctuation on peat soil greatly varies even during a day, therefore automatic GWL measurements are inevitably needed. This study aim is to develop an automatic GWL measurement (TMA) by comparing 2 automatic water level loggers in tropical peatlands. This research was conducted in a rubber plantation on Peat Soil I in Jabiren, Pulang Pisau, Central Kalimantan, from February to December 2014. The measurement of GWL was conducted by manual measurement and using 2 automatic water level monitoring devices. Automatic GWL measurement showed a more detail variation than that of manual measurement. The different of GWL between manual, automatic 1 and 2 were on the range of 16-30 cm. Automatic measurement instruments that users were having their advantages or disadvantages, with the result of measurements were significantly different.
Highlights
Ground Water level fluctuation data on tropical peatland is necessary to restore the degraded peatlands as well as for peatland sustainable management
Peatland restoration always begins with groundwater level restoration (GWL)
Measurement of GWL is necessary for further management
Summary
Penelitian ini dilaksanakan pada lahan gambut yang diusahakan untuk perkebunan karet (02 29ʹ50ʺS, 114 11ʹ20ʺE) di Jabiren, Pulang Pisau, Kalimantan Tengah, dari Bulan februari sampai Desember 2014. Lahan ini merupakan bagian dari proyek lahan gambut (PLG) yang dihentikan pada tahun 1997. Secara manual pada lahan menggunakan piezometer yang dibuat dari pipa PVC 1.5” yang dilubangi sepanjang 2 m dan dimasukkan ke dalam tanah dengan sisa pipa di atas permukaan gambut sekitar 20 cm. Pengukuran data TMA dilakukan setiap minggunya secara manual menggunakan papan ukur atau meteran. 2. Menggunakan alat pengukur otomatis (Hobo water level logger U20-001-01, Onset Computer Corporation, USA), hanya pada lahan di pipa yang sama dengan no. 1. Alat ini merupakan satu komponen bangunan antara sensor, perekam data dan baterai. 3. Menggunakan alat pengukur otomatis (Thermochron SL type, KN laboratories, Japan), yang dilengkapi dengan baterai dan perekam data terpisah. Pengukuran dilakukan pada lahan dengan perekaman data juga setiap 30 menit.
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