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  • 1

    Model to Estimate Carbon in Organic

    Soils Sequestration and Emissions

    (ECOSSE).

    User-Manual August 2010 Issue

    Smith J, Gottschalk P, Bellarby J, Richards M, Nayak D, Coleman K, Hillier J, Flynn H, Wattenbach M,

    Aitkenhead M, Yeluripurti J, Farmer J, Smith P

    Contact: Jo Smith

    Address: Institute of Biological and Environmental Sciences,

    School of Biological Sciences,

    University of Aberdeen,

    23 St Machar Drive, Room G45

    Aberdeen,

    AB24 3UU,

    Scotland,

    UK

    Tel: +44 (0)1224 272702

    Fax: +44 (0)1224 272703

    E-mail: jo.smith@abdn.ac.uk

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    WWW: http://www.abdn.ac.uk/ibes/staff/jo.smith/ECOSSE

    Contents

    PART A - MODEL DESCRIPTION ............................................................................................................. 11

    A1 Introduction ..................................................................................................................................... 11

    A1.1 Importance of long term estimates of aerobic decomposition ................................................ 11

    A1.2 The ECOSSE approach ............................................................................................................... 11

    A2 The activity of soil organic matter decomposition .......................................................................... 13

    A2.1 Definition of pools used in ECOSSE ........................................................................................... 13

    A2.2 Determining the initial sizes of soil organic matter pools ........................................................ 14

    A2.2.1 Rapid determination of initial soil organic matter pool sizes ............................................ 14

    A2.2.2 Initialization by full ECOSSE simulation .............................................................................. 16

    A2.3 Evaluation of the methods used to determine the initial sizes of the soil organic matter pools

    ........................................................................................................................................................... 17

    A3 Aerobic decomposition of soil organic matter pools ....................................................................... 18

    A3.1 Impact of soil water on aerobic decomposition ....................................................................... 19

    A3.2 Impact of soil temperature on aerobic decomposition ............................................................ 21

    A3.3 Impact of soil pH on aerobic decomposition ............................................................................ 21

    A3.4 Impact of crop cover on aerobic decomposition ...................................................................... 23

    A3.5 Impact of nitrogen on aerobic decomposition ......................................................................... 24

    A3.6 Impact of clay content on aerobic decomposition ................................................................... 25

    A3.7 Evaluation of ECOSSE simulations of aerobic decomposition .................................................. 26

    A4 Anaerobic decomposition of soil organic matter pools ................................................................... 26

    A4.1 Impact of soil water on anaerobic decomposition ................................................................... 27

    A4.2 Impact of soil temperature on anaerobic decomposition ........................................................ 28

    A4.3 Impact of soil pH on anaerobic decomposition ........................................................................ 30

    A4.4 Impact of crop cover on anaerobic decomposition .................................................................. 31

    A4.5 Impact of nitrogen on anaerobic decomposition ..................................................................... 31

    A4.6 Impact of clay content on anaerobic decomposition ............................................................... 31

    A4.7 Impact of oxygen on methane emissions ................................................................................. 31

    A4.8 Evaluation of ECOSSE simulations of anaerobic decomposition .............................................. 32

    A5 Nitrogen transformations ................................................................................................................ 32

    A5.1 Mineralisation / Immobilisation ................................................................................................ 32

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    A5.2 Nitrification ............................................................................................................................... 32

    A5.3 Denitrification ........................................................................................................................... 35

    A5.4 Nitrate leaching ......................................................................................................................... 38

    A5.5 Leaching of dissolved organic matter ....................................................................................... 38

    A5.6 Ammonia volatilisation ............................................................................................................. 41

    A5.6.1 Volatilisation loss from applied manure ............................................................................ 41

    A5.6.2 Volatilisation loss from fertiliser ........................................................................................ 42

    A5.7 Crop nitrogen uptake ................................................................................................................ 43

    A5.7.1 Plant Inputs ........................................................................................................................ 43

    A5.7.2 Timing of Management Events .......................................................................................... 43

    A.5.7.3 Fertiliser Applications ........................................................................................................ 43

    A.5.7.4 Pattern of Debris Incorporation ........................................................................................ 44

    A.5.7.5 Pattern of Nitrogen Uptake .............................................................................................. 46

    A5.8 Senescence ................................................................................................................................ 46

    A5.9 Evaluation of ECOSSE simulations of nitrogen transformations ............................................... 46

    A6 Water Movement ............................................................................................................................. 47

    A6.1 Vertical water movement ......................................................................................................... 47

    A6.2 Restricted flow .......................................................................................................................... 47

    A6.3 Evaluation of ECOSSE simulations of water movement ........................................................... 48

    PART B - SITE SPECIFIC SIMULATIONS ................................................................................................... 48

    B1 Input files .......................................................................................................................................... 48

    B1.1 Management Data .................................................................................................................... 48

    B1.1.1 Input through file MANAGEMENT.DAT .............................................................................. 48

    B1.1.2 Input by setup file .............................................................................................................. 49

    B1.2. Weather Data ........................................................................................................................... 50

    B1.3 Crop Parameters ....................................................................................................................... 50

    B1.4 Soil Parameters ......................................................................................................................... 52

    B2 Output files ....................................................................................................................................... 52

    PART C - LIMITED DATA SITE SIMULATIONS .......................................................................................... 54

    C1 Input files .......................................................................................................................................... 54

    C1.1 Site and management data ....................................................................................................... 54

    C1.2 Weather data ............................................................................................................................ 58

    C2 Output files ....................................................................................................................................... 58

    PART D - SPATIAL SIMULATIONS ........................................................................................................... 59

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    D1 Input files ..............................................................................................................

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