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 valuable function within the a number of capabilities of rural landscapes. Agro-ecosystem versions are more and more used to aid determination making on assorted scales in the direction of sustainable land use and management.This is followed by way of a requirement of version clients for version validation to get an idea concerning the reliability of versions. This publication includes articles from a workshop on "Modelling water and nutrient dynamics in crop-soil systems". info units from lysimeters and experimental fields of multiyear crop rotations have been supplied for modellers. a special information set is supplied of a a hundred yr long-term box scan concerning crop yield and natural carbon improvement below assorted administration systems.

The ebook incorporates a distinctive description of knowledge units which might be utilized by modellers and the papers describe the purposes of 18 diversified modelling techniques describing soil-crop-atmosphere interactions for water, nitrogen and carbon dynamics.

A comparability of the types utilized to an analogous information set is equipped which issues out similarities and adjustments within the description of unmarried tactics among the version techniques. this provides strength version clients and choice makers the chance to check the version outputs and get a more in-depth perception in regards to the applicability and required variations for the engaging models.

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Additional 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

The discrepancies between the measured aboveground biomass accumulation rates and yields with those simulated by OPUS is due to an overestimation of the impact of the limitations in nitrogen availability on the aboveground biomass accumulation and yield by the model OPUS. For the lysimeter data set, THESEUS simulated adequately daily evapotranspiration rates, but underestimated the flow peaks of ground water recharge (GWR) in comparison with the lysimeter data. The model OPUS was not applied to this data set.

Mai 31. Mai 1. Jul 1. Aug 31. Aug -200 1. Okt Fig. 3 Simulated and measured evapotranspiration and percolation/capillary rise at the sandy Wildeshausen soil. Measured rain is also shown Accumulated rain & evapotranspiration (mm) 600 500 400 600 measured rain measured evapotranspiration simulated evapotranspiration LAB simulated evapotranspiration PTF simulated percolation LAB simulated percolation PTF measured percolation 500 400 300 300 200 200 100 100 0 0 -100 -100 -200 1. Mär -200 31. Mär 1.

1995; Jamieson et al. 1998; Eitzinger et al. 2004). The main objective of our study is a report about the application of the modelling system THESEUS (Wegehenkel 2000) and the agroecosystem model OPUS (Smith 1992a) for the simulation of soil water balance and crop growth including a validation based on the comparison of simulated with measured model outputs such as soil water contents, pressure heads, soil nitrate contents, aboveground biomass, yield, actual evapotranspiration (AET) rates and ground water recharge (GWR) rates obtained from two field data sets.

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