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ABSTRAK Perairan muara merupakan perairan yang mempunyai karakteristik yang khas karena dipengaruhi oleh faktor hidrodinamika dan pola musim, yaitu musim timur dan musim barat. Tujuan penelitian ini adalah untuk mengaplikasikan metode perhitungan biogeokimia berdasarkan pendekatan LOICZ pada perairan muara Ciliwung dan memperoleh informasi tentang karakteristik nitrogen pada perairan muara Ciliwung. Berdasarkan hasil analisis diketahui bahwa pada musim timur dan musim barat perairan muara Ciliwung berperan sebagai nitrogen. Pada musim timur perairan muara Ciliwung bersifat autotrofik, sedangkan pada musim barat perairan tersebut bersifat heterotrofik. Hal ini dicirikan melalui siklus nitrogen dengan laju fiksasi lebih besar daripada laju respirasi pada musim timur, sedangkan pada musim barat yang terjadi adalah sebaliknya, laju respirasi lebih besar dibandingkan dengan laju fiksasinya, sebesar 21,14 mg/hari.  ABSTRACT Estuarine ecosystem was an unique ecosystem because of the hydrodynamic factor and seasonal pattern i.e. east season and west season, that influence the characteristic of the estuarine. The purpose of this study was to apply the LOICZ biogeochemical budgeting approach to Ciliwung estuary and to get the information about nitrogen budget in Ciliwung estuary. Based on the analysis the function of the estuary was as source of nitrogen on west season and east season. Nitrogen budget of the Ciliwung estuary obtained that the system was autotrophic while in east season, and tend to heterotrophic in west season. This condition was indicated that in the east season the fixation rate was more than respiration rate, but in west season the respiration rate was more than fixation rate with the respiration rate is 21.14 mg/day. /* Style Definitions */  table.MsoNormalTable  {mso-style-name:"Table Normal";  mso-tstyle-rowband-size:0;  mso-tstyle-colband-size:0;  mso-style-noshow:yes;  mso-style-priority:99;  mso-style-parent:"";  mso-padding-alt:0in 5.4pt 0in 5.4pt;  mso-para-margin:0in;  mso-para-margin-bottom:.0001pt;  mso-pagination:widow-orphan;  font-size:10.0pt;  font-family:"Calibri","sans-serif";}  Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */  table.MsoNormalTable  {mso-style-name:"Table Normal";  mso-tstyle-rowband-size:0;  mso-tstyle-colband-size:0;  mso-style-noshow:yes;  mso-style-priority:99;  mso-style-parent:"";  mso-padding-alt:0in 5.4pt 0in 5.4pt;  mso-para-margin:0in;  mso-para-margin-bottom:.0001pt;  mso-pagination:widow-orphan;  font-size:10.0pt;  font-family:"Calibri","sans-serif";}

KAJIAN KARAKTERISTIK MUARA CILIWUNG DENGAN MODEL BUDGET NITROGEN (Assessment of Ciliwung Estuary Characteristic with Nitrogen Budget Model)