Carbon and nitrogen accumulation within four black walnut alley cropping sites across Missouri and Arkansas, USA
| Autor: | Wendi Rogers, David M. Burner, David K. Brauer, Mark V. Coggeshall, Christian Dold, Thomas J. Sauer, Robert L. Kallenbach, Sougata Bardhan, Shibu Jose, Andrew L. Thomas |
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| Rok vydání: | 2020 |
| Předmět: |
Biomass (ecology)
010504 meteorology & atmospheric sciences biology business.industry Tree allometry chemistry.chemical_element Forestry 04 agricultural and veterinary sciences Understory biology.organism_classification 01 natural sciences chemistry Agronomy Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Livestock Allometry business Agronomy and Crop Science Carbon 0105 earth and related environmental sciences Juglans |
| Zdroj: | Agroforestry Systems. 94:1625-1638 |
| ISSN: | 1572-9680 0167-4366 |
| Popis: | Agroforestry systems that integrate useful long-lived trees have been recognized for their potential in mitigating the accumulation of atmospheric fossil fuel-derived carbon (C). Black walnut (Juglans nigra) is frequently planted and cultivated in North America for its valuable lumber and edible nuts, and is highly amenable to the integration of understory crops or livestock in agroforestry systems. However, little is known about C content in black walnut trees, including the amounts of C assimilated into lignocellulosic tissues within different tree compartments. Therefore, allometric equations for above- and below-ground compartments of 10-year-old black walnut trees across diverse locations were developed. Ten grafted black walnut trees from each of four sites across the midwestern USA were destructively harvested for above- and below-ground biomass, and dry biomass weight (DWw), C (Cw) and nitrogen (N; Nw) stocks were quantified. Soils surrounding the harvested trees were sampled and analyzed for soil organic C (SOC) and total N (TN). Total DWw ranged from 27 to 54 kg tree−1, with woody tissues containing an average of 467 g kg−1 C and 3.5 g kg−1 N. Woody tissues differed in Cw and Nw across location, and above-ground sections contained more C and less N compared with most root tissues. The slopes of the allometric equations did not differ significantly among locations, while intercepts did, indicating that trees only differed in initial size across locations. SOC and TN did not vary in distance from the trees, likely because the trees were not yet old enough to have impacted the surrounding soils. Our results establish a foundation for quantifying C and N stocks in newly established black walnut alley cropping systems across diverse environments. |
| Databáze: | OpenAIRE |
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