Total aboveground biomass and net dry matter accumulation by plant component in young Eucalyptus globulus in response to irrigation |
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| Institution: | 1. Research Animal Scientist, USDA Agricultural Research Service, Jornada Experimental Range, Las Cruces, NM 88003, USA;2. Professor, Department of Animal and Range Science, New Mexico State University, Las Cruces, NM 88001, USA;3. Assistant Professor, Department of Animal Science, Kellogg Biological Station, Michigan State University, Hickory Corners, MI 49060, USA;4. Graduate Student, Dept of Animal and Range Science, New Mexico State University, Las Cruces, NM 88001, USA;5. Student Intern, Dept of Biology, Brigham Young University - Idaho, Rexburg, ID 83460, USA;6. Associate Professor, Department of Animal and Range Science, New Mexico State University, Las Cruces, NM 88001, USA |
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| Abstract: | A system of equations describing total aboveground biomass, the proportion of total aboveground biomass accumulated by different plant components, and instantaneous net dry matter accumulation fraction is developed as a function of tree diameter, height, and the growth rates of diameter and height. This system is utilized in the analysis of a Eucalyptus globulus fertilization/irrigation experiment in central Portugal. The data were from the period prior to competition-induced mortality in the stands, but previous analyses had reported apparent changes in tree growth rates due to intraspecific competition in the experimental stands. The irrigation treatments affected the relationship between tree dimensions and total aboveground biomass as well as the accumulation of biomass by different aboveground plant components (p≤0.05). There were no differences in these relationships due to fertilization (p=0.05), in spite of previously reported increases in biomass production in response to fertilization. Even though irrigation affects dimensional biomass relationships in E. globulus, analyses demonstrate that previously reported differences in biomass production and accumulation by the various aboveground plant components are, to a much greater extent, due to changes in the growth rates of diameter and height among the treatments rather than to the changes in structural relationships due to the experimental treatments. |
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