Download Modelling water and nutrient dynamics in soil–crop systems: by Kurt Christian Kersebaum, Jens-Martin Hecker (auth.), Kurt PDF

By Kurt Christian Kersebaum, Jens-Martin Hecker (auth.), Kurt Christian Kersebaum, Jens-Martin Hecker, Wilfried Mirschel, Martin Wegehenkel (eds.)

Soil-crop-atmosphere interactions play a important position within the a number of capabilities of rural landscapes. Agro-ecosystem versions are more and more used to help determination making on varied scales in the direction of sustainable land use and management.This is followed by means of a requirement of version clients for version validation to get an concept concerning the reliability of versions. This e-book comprises articles from a workshop on "Modelling water and nutrient dynamics in crop-soil systems". facts units from lysimeters and experimental fields of multiyear crop rotations have been supplied for modellers. a special information set is equipped of a a hundred yr long-term box scan relating to crop yield and natural carbon improvement below assorted administration systems.

The publication contains a exact description of information units which are utilized by modellers and the papers describe the purposes of 18 diverse modelling techniques describing soil-crop-atmosphere interactions for water, nitrogen and carbon dynamics.

A comparability of the versions utilized to a similar info set is supplied which issues out similarities and modifications within the description of unmarried strategies among the version methods. this offers power version clients and selection makers the chance to check the version outputs and get a more in-depth perception concerning the applicability and required variations for the partaking models.

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Read Online or Download Modelling water and nutrient dynamics in soil–crop systems: Proceedings of the workshop on “Modelling water and nutrient dynamics in soil–crop systems” held on 14–16 June 2004 in Müncheberg, Germany PDF

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Extra info for Modelling water and nutrient dynamics in soil–crop systems: Proceedings of the workshop on “Modelling water and nutrient dynamics in soil–crop systems” held on 14–16 June 2004 in Müncheberg, Germany

Example text

Model output covers the daily values of soil water storage, accumulated amounts and daily fluxes of precipitation, evapotranspiration, transpiration, deep percolation, capillary rise and surface runoff, as well as daily water contents and matric potentials of each soil layer. The model mainly has been used in practical work of the Institute for Soil Water Management Research experts in assessing influence of capillary rise upon plant growth, influence of land use change upon ground water recharge and estimating irrigation demand.

2t 2h 2 (k (h) $ + k (h)) 2z + qe 2z (7) where Cc(h) is the slope of the curve ∂q/∂h, h is soil water pressure head in mm, t is time, z is depth in mm, k(h) is the hydraulic conductivity, and qe is a sink due to the removal of water by plants and/or losses of water by evaporation from soil surface layers, both in mm day−1. A modification of the Brooks–Corey func- tions (Brooks and Corey 1964) describes the soil water retention and hydraulic characteristics. The dynamics of the soil microbial system and the carbon, nitrogen and phosphorus cycles in the soil are simulated using an organic residue decomposition model.

2 and 3. In THESEUS2, the impact of the vegetation on soil water balance is simulated with a semiempirical plant modelling approach according to Koitzsch and Günther (1990). This approach is based on simple empirical two-dimensional table functions with linear interpolation between neighbouring table values for rooting depth (RD), for plant height, and for soil coverage of a given crop for the calculation of transpiration, interception, and evaporation (Koitzsch and Günther 1990). These table functions consist of a certain number of data pairs (crop parameter; Julian day of the year), which correspond to significant phenological stages of the crop.

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