NDLI: Sixteen-Year Biomass Yield and Soil Carbon Storage of Giant Reed (Arundo donax L.) Grown Under Variable Nitrogen Fertilization Rates

Content Provider	Springer Nature Link
Author	Monti, Andrea Zegada Lizarazu, Walter
Copyright Year	2015
Abstract	High and stable biomass yields for long periods (15–20 years) are indispensable for the successful establishment of a well-developed bioenergy sector. However, the effects of management practices, particularly nitrogen fertilization, on productivity and soil organic carbon (SOC) are difficult to understand, especially when considering that continuous harvesting cycles may have cumulative effects on the crop and its resources use capacity. The objective of this study was to evaluate the effects of different N fertilization levels on biomass production and SOC accumulation of giant reed over 16 years. Every year, starting from the second one, two N fertilization rates were applied: 80 (N$_{80}$) and 160 (N$_{160}$) kg N ha$^{−1}$. The control treatment (N$_{0}$) was unfertilized. Nitrogen content and use capacity, and SOC gains were determined. Mean 16-year biomass yields were 16.2, 17.1, and 19.5 Mg ha$^{−1}$ in the N$_{0}$, N$_{80}$, and N$_{160}$ treatments, respectively. Variable yielding phases were observed in the N$_{160}$ treatment with declining yields towards the last sampling season, whereas the N$_{0}$ was characterized by increasing yields up to the fourth growing season; thereafter, declining yields were observed. Nitrogen concentration and removed N in the aboveground harvested biomass increased from N$_{0}$ to N$_{160}$ and as the stand become older. Mean total SOC stock gains were 1.0 and 0.6 Mg C ha$^{−1}$ year$^{−1}$ in the N$_{160}$ and N$_{0}$ treatments, respectively. The largest SOC stocks were found in the topsoil, with the largest amount (12 Mg C ha$^{−1}$ in 16 years) in the N$_{160}$ treatment. In conclusion, long-term high N fertilization rates result in marginal increments in biomass productivity (about 3 Mg ha$^{−1}$ year$^{−1}$), but in substantial increments in SOC, especially in surface soil layers. A farmer might prefer to grow giant reed without the burdens of fertilization despite the seemingly benefits on SOC and lower yields of unfertilized plots.
Starting Page	248
Ending Page	256
Page Count	9
File Format	PDF
ISSN	19391234
Journal	BioEnergy Research
Volume Number	9
Issue Number	1
e-ISSN	19391242
Language	English
Publisher	Springer US
Publisher Date	2015-10-22
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bioenergy Biomass Marginal land Long-term Soil carbon Yield Plant Sciences Plant Genetics & Genomics Plant Breeding/Biotechnology Plant Ecology Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment Agronomy and Crop Science

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