Analysis of spatio-temporal patterns of CO2 and H2O fluxes in relation to crop growth under field conditions

作者：Kupisch Moritz^*; Stadler Anja; Langensiepen Matthias; Ewert Frank

来源：Field Crops Research, 2015, 176: 108-118.

DOI：10.1016/j.fcr.2015.02.011

• Canopy gas exchange
• Photosynthesis
• Transpiration
• Spatial heterogeneity
• Wheat
• Barley

This study aimed at observing and analyzing spatial and temporal patterns of growth and CO2 and H2O fluxes in winter wheat (Triticum aestivum L) and winter barley (Hordeum vulgare L.) under heterogeneous soil conditions. Canopy level gas exchange, dry matter, leaf area development and plant available water were measured for this purpose at eight different observation points in three consecutive years (2011-2013) in a 0.72 ha farmer's field with variable soil conditions. Results show that the dynamics of crop growth and carbon and water fluxes can have a high spatial and inter-annual variability depending on the underlying water supply patterns. Vegetation patterns arise from responses of growth processes and LAI development to drought stress. Flux patterns of CO2 could be linked to soil heterogeneity and leaf area development patterns. This has implications for the choice of scale and model complexity in applying crop growth models at the field level, suggesting a variable selection of scale and model setup depending on the variability of environmental drivers of plant growth and gas exchange.

• 出版日期2015-5