ABSTRAKKeberadaan vegetasi mangrove dalam tambak wanamina berfungsi sebagai penyedia jasa lingkungan, diantaranya dalam pengendalian suplai nutrien ke dalam kolam. Penelitian ini bertujuan untuk mengkaji variasi kandungan nutrien dalam tambak wanamina dan menguji pengaruh jenis serta jumlah tegakan terhadap perubahan kandungan nutrien tambak wanamina. Penelitian dilaksanakan selama 4 bulan dengan perlakuan jenis vegetasi (A. marina; R. mucronata; Campuran) dan jumlah tegakan mangrove (5 tegakan; 10 tegakan; 15 tegakan). Kandungan nutrien yang diamati meliputi bahan organik, nitrat, nitrogen dan fosfat terlarut. Pengamatan dilakukan sebanyak 2 kali dengan jeda waktu 1 bulan. Pengujian dilakukan dengan uji-t dan ANOVA. Hasil pengamatan menunjukkan bahwa terdapat variasi kandungan nutrien dalam tambak wanamina baik pada pengamatan pertama maupun kedua. Pola perubahan kandungan nutrien bervariasi antar jenis nutrien dimana pada beberapa perlakuan ditemukan penurunan kandungan semua jenis nutrien. Hasil uji-t menunjukkan bahwa antar periode pengamatan tidak terdapat perbedaan yang signifikan terhadap kandungan bahan organik, nitrat, nitrogen dan fosfat terlarut. Hasil ANOVA menunjukkan bahwa tidak terdapat pengaruh yang signifikan terhadap kandungan nutrien dalam tambak wanamina baik pada pengamatan pertama maupun kedua. Perbedaan kandungan nutrien yang signifikan hanya diperoleh pada kandungan bahan organik pada pengamatan pertama.
Kata kunci: jenis, jumlah tegakan, mangrove, nutrien, wanamina
ABSTRACTThe presence of mangrove vegetation in silvofishery ponds provide environmental services, such as controling nutrient supply to the ponds. This research aimed to study the variations of nutrient concentration in silvofishery pond and to analyze the effect of mangrove species and stand population on the change of nutrient concentration in silvofishery ponds. Research was conducted for 4 months involving treatments of mangrove species (A. marina; R. mucronata; Mixed) and stand population (5 stands; 10 stands; 15 stands). Concentration of nutrient observed in this research were dissolved organic matter, nitrate, nitrogen and phosphate. Observations were conducted twice with spare period of 1 month. Analysis were conducted with ttest and ANOVA. The observation result showed there were variation of nutrient concentration in silvofishery pond for both first and second observations. Change pattern of nutrients were varied among nutrient types, were some treatments showed consistent decrease for all nutrient types. Result of t-test showed there were no significant difference of dissolved organic matter, nitrate, nitrogen and phosphate resulted from first and second observations. ANOVA showed generally there were no significant efect of the treatments on the concentration of nutrient in silvofishery pond partially in first observation and second obsercation. Significant difference of nutrient concentration was achieved from organic matter in first observation.