Gramp Model Instance

HTTP 200 OK
Allow: GET, PUT, PATCH, DELETE, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "/models/15",
    "family": "DNDC",
    "title": "NZ-DNDC",
    "description": "<p><p>NZ-DNDC is a modified version of DNDC that\r\nincludes a number of alterations to best reflect the conditions found in New\r\nZealand and was developed by a team at Landcare Research in New Zealand. The\r\npresence of distinctive and diverse soil types within a short distance and\r\nsoils having a higher organic carbon content than the world average; coupled\r\nwith climatic conditions and grazed pastoral systems which differ from many\r\nother countries meant that the application of the DNDC model to New Zealand was\r\nchallenging.&nbsp; </p>\r\n<p>Originally, the relationship between air\r\nand soil temperatures in the DNDC model was based on northern hemisphere\r\nconditions.&nbsp; This was altered for the New\r\nZealand model, based on calculations using New Zealand specific national soil\r\nand air temperature datasets.&nbsp; The Water\r\nFilled Pore Space (WFPS) threshold value to switch dentrification on/off was\r\nalso altered in this version of the DNDC from a value to 35% to the field\r\ncapacity value.&nbsp; Additionally, the model\r\nallows soil saturation by simulating drainage followed by infiltration (the\r\nreverse of the DNDC), which is representative of the winter months.&nbsp; </p>\r\n<p>Annual pasture growth rates vary with\r\nseason in New Zealand, with growth rates typically highest in spring and lowest\r\nin winter.&nbsp; A multiplicative day-length\r\nfactor was introduced into NZ-DNDC to reflect the seasonal changes and produce\r\nN uptake rates typical of New Zealand (more N is taken up on longer days, less\r\non shorter days).&nbsp; Excretal-N inputs\r\nfrom grazing animals were also included in the model and are described further\r\nin Saggar et al. (2004).</p>\r\n<p>Total yearly N2O emission estimates from\r\nboth grazed and ungrazed pastures in New Zealand were found to be within the\r\nuncertainty ranges of measured data.&nbsp; The\r\nmodel reflected observations due to climatic variations in rainfall and\r\ndifferences in soil texture on field scale experiments; measured emissions\r\nchanged with varying soil moisture and were approximately 20% higher in silt\r\nloam soil (poorly drained) than in sandy loam soil (well drained). Saggar et\r\nal. (2004) found the model to effectively simulate most of the patterns in WFPS\r\nand nitrous oxide (N2O) emissions observed on grazed and ungrazed land.&nbsp; The model represented real variability in\r\nthe processes regulating N2O emissions and is suitable for simulating emissions\r\nfor a range of New Zealand grazed pastures.&nbsp;</p></p>",
    "keywords": "Excretal inputs, Grazed Pastures, IPCC methodology, New Zealand Modified DNDC, Nitrous Oxide, Temperate Grasslands",
    "principal_authors": "S. Saggar, R. M. Andrew, K.R. Tate, C.C.Hedley, N.J. Rodda and J. A Townsend",
    "contact_name": "S. Saggar",
    "contact_email": "saggars@Landcareresearch.co.nz",
    "organization": "Landcare Research, Palmerston North, New Zealand.",
    "latest_version": "",
    "website": "",
    "language": "",
    "systems_supported": "",
    "source_code_available": "",
    "model_extended_family": "",
    "sectors": "Agriculture, Grassland",
    "submitted_by": "",
    "reference_url": "",
    "published_on": "2004-07-01",
    "lft": 210,
    "rght": 225,
    "tree_id": 1,
    "level": 1,
    "parent": "http://gramp.ags.io/api/models/2/?format=api"
}