Drought- and heat-induced shifts in vegetation composition impact biomass production and water use of alpine grasslands

2020 ◽  
Vol 169 ◽  
pp. 103921 ◽  
Author(s):  
Elena Tello-García ◽  
Lisa Huber ◽  
Georg Leitinger ◽  
Andre Peters ◽  
Christian Newesely ◽  
...  
Keyword(s):  
Water Use ◽  
Biomass Production ◽  
Vegetation Composition ◽  
Alpine Grasslands

scholarly journals A STELLA-Based Model to Simultaneously Predict Hydrological Processes, N Uptake and Biomass Production in a Eucalyptus Plantation

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 515
Author(s):  
Ying Ouyang ◽  
Gary Feng ◽  
Heidi Renninger ◽  
Theodor D. Leininger ◽  
Prem Parajuli ◽  
...  
Keyword(s):  
Water Use ◽  
Biomass Production ◽  
Net Primary Production ◽  
N Uptake ◽  
Hydrological Processes ◽  
Modeling Tools ◽  
Eucalyptus Plantation ◽  
Simulation Scenario ◽  
Use Efficiency ◽  
N Use

Eucalyptus is one of the fastest growing hardwoods for bioenergy production. Currently, few modeling tools exist to simultaneously estimate soil hydrological processes, nitrogen (N) uptake, and biomass production in a eucalyptus plantation. In this study, a STELLA (Structural Thinking and Experiential Learning Laboratory with Animation)-based model was developed to meet this need. After the model calibration and validation, a simulation scenario was developed to assess eucalyptus (E. grandis × urophylla) annual net primary production (ANPP), woody biomass production (WBP), water use efficiency (WUE), and N use efficiency (NUE) for a simulation period of 20 years. Simulation results showed that a typical annual variation pattern was predicted for water use, N uptake, and ANPP, increasing from spring to fall and decreasing from fall to the following winter. Overall, the average NUE during the growth stage was 700 kg/kg. To produce 1000 kg eucalyptus biomass, it required 114.84 m3 of water and 0.92 kg of N. This study suggests that the STELLA-based model is a useful tool to estimate ANPP, WBP, WUE, and NUE in a eucalyptus plantation.

scholarly journals Effect of fertilization level on water use and production of corn (Zea mays L.) in a cereal producing area in Colombia - a modeling exercise using AquaCrop-FAO

2017 ◽  
Vol 35 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Javier García A. ◽  
Gerhard Fischer ◽  
Nestor Riaño H.
Keyword(s):  
Grain Yield ◽  
Water Use ◽  
Biomass Production ◽  
Harvest Index ◽  
Potential Evapotranspiration ◽  
Growing Season ◽  
Total Biomass ◽  
Water Shortages ◽  
White Grain ◽  
Fertilization Level

The effect of the amount of fertilization applied to the corn variety 'ICA V-156' (white grain) was calibrated and validated with the simulator AquaCrop in Cerete (Cordoba, Colombia) at an altitude of 20 m. The fertilization level determined factors related to biomass production, the harvest index, yield and water use, and potential evapotranspiration (Eto). The basic information which calibrated and validated the model came from research conducted in different altitudes in maize growing areas in Colombia. Unexpectedly, the water shortages occurred during the growing season, which the modelling had not considered. Levels of 90 to 60% of fertilization were applied to the crop according to the analysis of the evaluated soil. The information was subjected to an analysis of variance; the results showed that the level of fertilization affected the formation of biomass, harvest index and yield, as well as, the use of water during the growing season. The ETo values were extreme at 0.9 and 7.3 mm day-1. Likewise the total biomass production was 4.64% less at the level of 90 and 25.04% less at 60% fertilization, as compared to the biomass measurements in the field. Similarly, the harvest index was 32.3 and 29.8% for the 90 and 60% levels of fertilization, respectively; on the other hand the grain yield was not affected by the highest level (90%), whereas when the reduction in fertilization was 40%, a decrease of 14.335% in the grain yield was obtained. In addition, per m3 of water 18.87 and 23.02 kg of grain for the fertilization levels of 60 and 90% were formed, respectively.

scholarly journals Ecophysiological screening of tree species for biomass production: trade-off between production and water use

Ecosphere ◽  
2013 ◽  
Vol 4 (11) ◽  
pp. art138 ◽  
Author(s):  
Dan Wang ◽  
David LeBauer ◽  
Gary Kling ◽  
Thomas Voigt ◽  
Michael C. Dietze
Keyword(s):  
Water Use ◽  
Biomass Production ◽  
Tree Species ◽  
Trade Off
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