Sites were selected as part of an urban afforestation project by NYC Department of Parks and Recreation 2009-2011. Ten sites in urban parks in NYC were planted with two plots of low diversity treatment and two plots with high diversity treatment; four plots total at each site. Low diversity treatment included two tree species, and high diversity treatment included six tree species. The experimental sites served as a long-term project to study afforestation outcomes under different restoration strategies. More detailed site description is provided by Downey et al. 2021. The data provided here only includes soil chemistry analysis conducted at each site.
Site locations (Latitude – N, Longitude – W): Alley Pond (40.76379121, -73.7509591), Canarsie (40.63427316, -73.88329729), Clearview (40.77822153, -73.78559891), Clove Lakes (40.6189031, -74.11644244), Conference House (40.50295497, -74.22803331), Fort Totten (40.79566063, -73.77727224), Marine Park 1 (40.59406886, -73.923558), Marine Park 2 (40.5914048, -73.92268008), Marine Park 3 (40.59633507, -73.92652368), Pelham Bay (40.86188697, -73.79628156).
Field sampling was was conducted over a one-month period in the summer of 2018 (mid-June to mid-July) using a standard 3.3 cm diameter soil corer (JMC ESP slide hammer) to a depth of 1 meter (2 cores per plot at 10 urban park sites). Sampling was repeated at all sites in fall of 2019 (September to October) to verify the soil data collected in 2018. Sampling took place in proximity to the sampling points from the previous year using a 3.81 cm diameter soil corer, to a depth of 30 cm. Each soil sample was enclosed in a plastic sleeve with secured end caps, then placed in a cooler for transport to the laboratory, where samples were stored in a refrigerator at 4°C until samples were processed.
Laboratory methods followed those used by Raciti et al. (2011a,b) and described by Groffman et al. (1999) to measure microbial biomass carbon and nitrogen content, microbial respiration, potential net nitrogen mineralization, potential net nitrification, potential denitrification, pools of extractable ammonium and nitrate, total soil carbon and nitrogen.
==================== Data Sources =========================
References: Downey, A.E., Groffman, P.M., Mejia, G.A., Cook, E.M., Sanpinsa, S., Karty, R., Palmer, M.I.,
McPhearson, T. 2021. Soil Carbon Sequestration in Urban Afforestation Sites in New York City. Urban Forestry & Greening: 127342.
Groffman, P. M., E. Holland, D. D. Myrold, G. P. Robertson, and X. Zou. 1999. Denitrification. In: G. P. Robertson, C. S. Bledsoe, D. C. Coleman, and P. Sollins, editors. Standard soil methods for long term ecological research. New York (NY): Oxford University Press. p. 272– 288.
Raciti, S. M., P. M. Groffman, J. C. Jenkins, R. V. Pouyat, T. J. Fahey, S. T. A. Pickett, and M. L. Cadenasso. 2011. Nitrate production and availability in residential soils. Ecological Applications 21:2357–2366.
Raciti, S. M., P. M. Groffman, J. C. Jenkins, R. V. Pouyat, T. J. Fahey, S. T. A. Pickett, and M. L. Cadenasso. 2011. Accumulation of Carbon and Nitrogen in Residential Soils with Different Land-Use Histories. Ecosystems 14:287–297.
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