Mean annual concentration of mineral nitrogen in soil water (mgN / kgH20) in the pre 1788 scenario

\n\nDefinition: Mean annual dissolved concentration of mineral nitrogen in soil\nwater (mg of nitrogen per kg of water), averaged for both soil layers.\nInterpretation: The dissolved N concentration is calculated as the ratio of\nthe mineral N store to soil water store, which assumes that all the mineral N\nis in solution. Rainfall has a strong influence on the pattern of both these\nstores, but not on their ratio. The pattern of mineral N concentrations is\nexplained by the effect of air dryness (saturation deficit) on the mineral N\nstore (mainly controlled by NPP) which is greater than the effect of air\ndryness on the soil water store (mainly determined by rainfall or energy\nlimitation). This gives a pattern of N concentration in soil water that\ndecreases as the climate-average air dryness increases from temperate to semi-\narid tropical environments. Notes: These are model-based estimates from the\nBiosEquil model. Results are given for the aBasea (pre-1788) and aAgrica\n(present day) conditions. The aAgrica case includes (1) current agricultural\ninputs of water from irrigation; (2) current agricultural inputs of nutrients\n(nitrogen and phosphorus) from fertiliser, legume crops, and legume pastures;\n(3) current nutrient offtakes by product removal (harvest, stock).\nNMnlConc0.Agric a Mean annual concentration of mineral nitrogen in soil water\n(mgN kgH2O-1) in the aAgrica (present day) scenario NMnlConc0.Base a Mean\nannual concentration of mineral nitrogen in soil water (mgN kgH2O-1) in the\naBasea (pre-1788) scenario Data is in geographics and GDA94.\n\nSee [further metadata](http://data.daff.gov.au/anrdl/metadata_files/pa_cmnswr9cl\n__02811a02.xml) for more detail.\n\n