Abstract
The constructions of canals for water use and management as well as supporting activities of productions, transportation and firebreaks lines are expected to have an impact on the biophysical and chemical changes in construction land. Therefore, the aims of this research are to know the amount of vegetation lost due to land clearing for canal constructions, land biophysical-chemical conditions changed as a result of canal clearing, aboveground carbon dioxide estimation and soil carbon stock estimation. Primary data collection determined by purposive on canal line for stand structure and composition, along with soil carbon estimation. The results showed that the opening of canal area of 82,35 ha will result in the loss of 19.866 sago trees on 40 cm average in diameter and 3.642 mature trees. Thus, sago starch on 82,35 ha will lost as much as 637,27 tons or 637.265,48 kg. Changes in land biophysical-chemical due to canal constructions are habitat fragmentation, increase in soil erosion, land slide of canal wall, changes in water quality particularly solid suspension total as a direct impact to increased turbidity, sedimentation, and siltation of canals. Furthermore, the impact of 82,35 ha canal construction was increasing of carbon dioxide (CO2) emission as much as 38.716,48 ton, and it is estimated that it will increase in line with future canal construction. Based on soil bulk density ranging from 0,58 to 1.22 g/cm3 and Carbon-organic content ranging from 16.65 to 54,16 %, it is estimated that carbon stock on 0 to 30 cm soil layer on 1 Ha area will be lost as 109 ton.
Highlights
The constructions of canals for water use and management as well as supporting activities of productions, transportation and firebreaks lines are expected to have an impact on the biophysical and chemical changes in construction land
The aims of this research are to know the amount of vegetation lost due to land clearing for canal constructions, land biophysical-chemical conditions changed as a result of canal clearing, aboveground carbon dioxide estimation and soil carbon stock estimation
The results showed that the opening of canal area of 82,35 ha will result in the loss of 19.866 sago trees on 40 cm average in diameter and 3.642 mature trees
Summary
Analisis data sesuai dengan kebutuhan yaitu perubahan biofisik-kimia lahan yang ditimbulkan dan jumlah emisi karbondioksida yang dihasilkan oleh pembukaan kanal. 9. Perhitungan kualitas air (sifat fisik), dengan parameter Bau dan Rasa secara Organoleptik, Warna secara visual, Kekeruhan dengan alat Turbidimeter di Laboratorium Perikanan UNIPA, Kecerahan dengan alat secci disk, Total Padatan Terlarut (TDS) dan Total Padatan Tersuspensi (TSS) melalui analisis secara gravimetri di Laboratorium Badan Lingkungan Hidup Kabupaten Manokwari, Suhu Air dengan alat temometer air, sumber data merupakan data primer. A. Pengumpulan Data Pengumpulan data primer dilakukan pada titik sampling yang telah ditentukan secara purposif atau sengaja pada jalur kanal guna me-ngkaji perubahan biofisik-kimia lahan yang ditimbulkan dan pada areal konsesi yang diperkirakan akan berdampak langsung akibat pembukaan kanal, dan melakukan pengambilan data komposisi dan struktur tegakan serta pendugaan karbon di dalam tanah (di bawah permukaan).
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