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A STELLA Model to Estimate Water and Nitrogen Dynamics in a Short‐Rotation Woody Crop Plantation
Author(s) -
Ouyang Ying,
Zhang Jiaen,
Leininger Theodor D.,
Frey Brent R.
Publication year - 2015
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2014.01.0015
Subject(s) - environmental science , evapotranspiration , transpiration , soil water , agronomy , leaching (pedology) , water content , hydrology (agriculture) , soil science , ecology , botany , photosynthesis , biology , geotechnical engineering , engineering
Although short‐rotation woody crop biomass production technology has demonstrated a promising potential to supply feedstocks for bioenergy production, the water and nutrient processes in the woody crop planation ecosystem are poorly understood. In this study, a computer model was developed to estimate the dynamics of water and nitrogen (N) species (e.g., NH 4 –N, NO 3 –N, particulate organic N, and soluble organic N [SON]) in a woody crop plantation using STELLA ( S tructural T hinking and E xperiential L earning L aboratory with A nimation) software. A scenario was performed to estimate diurnal and monthly water and N variations of a 1‐ha mature cottonwood plantation over a 1‐yr simulation period. A typical monthly variation pattern was found for soil water evaporation, leaf water transpiration, and root water uptake, with an increase from winter to summer and a decrease from summer to the following winter. Simulations further revealed that the rate of soil water evaporation was one order of magnitude lower than that of leaf water transpiration. In most cases, the relative monthly water loss rates could be expressed as evapotranspiration > root uptake > percolation > runoff. Leaching of NO 3 –N and SON depended not only on soil N content but also on rainfall rate and duration. Leaching of NO 3 –N from the cottonwood plantation was about two times higher than that of SON. The relative monthly rate of N leaching was NO 3 –N > SON > NH 4 –N. This study suggests that the STELLA model developed is a useful tool for estimating water and N dynamics from a woody crop plantation.