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THE NITROGEN CYCLE IN SURFACE WATERS. PHYTOPLANKTON ELEMENTAL COMPOSITION O53% C27% K6.2% H5.5% N4.6% Ca1.0% S0.7% Na0.7% P0.5% Fe0.4% Mg0.4% Zn0.3% Cu0.02%

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Presentation on theme: "THE NITROGEN CYCLE IN SURFACE WATERS. PHYTOPLANKTON ELEMENTAL COMPOSITION O53% C27% K6.2% H5.5% N4.6% Ca1.0% S0.7% Na0.7% P0.5% Fe0.4% Mg0.4% Zn0.3% Cu0.02%"— Presentation transcript:

1 THE NITROGEN CYCLE IN SURFACE WATERS

2 PHYTOPLANKTON ELEMENTAL COMPOSITION O53% C27% K6.2% H5.5% N4.6% Ca1.0% S0.7% Na0.7% P0.5% Fe0.4% Mg0.4% Zn0.3% Cu0.02% B0.01% Mn0.009% Co0.0006% V0.0006% Mo0.0001% Si0.1%; DIATOMS 20%

3 N2N2

4 FIGURE 12-1; N 2 IN GREEN LAKE AND BELOIE LAKE

5 N-FIXATION

6 CYANOBACTERIA AND N-FIXATION

7 OTHER MICROBIAL NITROGEN FIXERS Azotobacter

8 MEROMICTIC LAKES AND N-FIXATION

9 SYMBIOSIS N-FIXATION OFTEN THROUGH SYMBIOSIS WITH VASCULAR PLANTS e.g. – Alders (wetland plants) – Legumes – Azolla (aquatic fern)

10 AMMONIUM AND NITRATE

11 AMMONIUM BY-PRODUCT OF DEAMINATION NH 4 + and NH 4 OH (see p233) pHNH 4 + : NH 4 OH 63000:1 7300:1 830:1 9.51:1

12 NITROGEN CYCLE

13 NITRIFICATION NH 4 + NO 2 - Nitrosomonas – Requires O 2 ; wide range of temperature and pH NO 2 - NO 3 - Nitrobacter – Requires O 2 ; warm temperatures and low pH

14 DENITRIFICATION C 6 H 12 O NO NO CO 2 +6H 2 O C 6 H 12 O 6 + 8NO 2 - 4N 2 + 2CO 2 + 4CO H 2 O

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16 REDUCTION IN AN ANOXIC ENVIRONMENT

17 NITRIFICATION AND DENITRIFICATION

18 ORGANIC NITROGEN DISSOLVED ORGANIC NITROGEN (DON) PARTICULATE ORGANIC NITROGEN (PON) DON:PON INCREASES WITH EUTROPHICATION

19 NITRATE AND PON

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21 INORGANIC NITROGEN IN WINTERGREEN LAKE

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23 NITROGEN CYCLE

24 NITROGEN IN STREAMS

25 NUTRIENT SPIRALLING

26 NITROGEN LOADING

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28 NITRATE IN THE CHESAPEAKE BAY

29 Dead Zone summer 2011, USEPA

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