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EUTROFIKASI – MITIGASI FOSFAT

EUTROFIKASI – MITIGASI FOSFAT

 

MITIGASI EUTROFIKASI BERBASIS PENGELOLAAN FOSFAT  telah  lama dianggap sebagai alat utama dalam manajemen eutrofikasi , dalam banyak kasus metode ini belum menghasilkan perbaikan kualitas air dan pengurangan gangguan pertumbuhan alga di sungai dan ekosistem hilir yang terkait.

Mengapa kualitas air dan ekologi air belum pulih kembali, setelah dua dekade atau lebih berkurang input P , termasuk ( i ) warisan manajemen penggunaan lahan masa lalu , ( ii ) respon pertumbuhan alga sungai rehadap pasokan P di sungai yang terganggu secara eutrophic, dan ( iii ) jalur pemulihan , yang mungkin nonlinear dan ditandai dengan ambang batas dan kondisi alternatif yang stabil.  Ada kemungkinan bahwa baseline telah bergeser dan bahwa beberapa kualitas lingkungan sungai terganggu mungkin tidak pernah pulih kembali ke kondisi semula atau mungkin memerlukan pengurangan P hingga lebih rendah dari konsnetrasi awalnya sebelum mengalami degradasi ekologi .

Implikasi praktisnya adalah menetapkan kriteria hara berbasis-P untuk melindungi dan meningkatkan kualitas air sungai dan ekologi sungai.

Tantangan yang dihadapi manajemen hara dan pengendalian eutrofikasi memerlukan adanya terobosan IPTEK , di mana pada kondisi ketidakpastian yang besar , intervensi manajemen sangat diperlukan , dan risikonya sangat tinggi .

Pendekatan yang lebih holistik diperlukan bagi manajemen eutrofikasi yang mencakup kriteria hara yang lebih canggih dan melibatkan kontrol hara dan polutan lainnya,  serta restorasi sungai ( misalnya  habitat fisik dan interaksi jaring-jaring makanan fungsional ) untuk meningkatkan kualitas air yang lebih bagus dan fungsi ekosistem kontinum tanah – air tawar .

 

Sumber: Helen P. Jarvie,  Andrew N. Sharpley,  Paul J. A. Withers,  J. Thad Scott,  Brian E. Haggard  and  Colin Neal. 2013.  Phosphorus Mitigation to Control River Eutrophication: Murky Waters, Inconvenient Truths, and “Postnormal” Science. jEQ 2013. Vol. 42 No. 2, p. 295-304

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