scholarly journals Particulate Organic Matter and Soil Nitrogen Availability in Urban Landscapes

2006 ◽  
Vol 32 (4) ◽  
pp. 180-191
Author(s):  
Bryant Scharenbroch ◽  
John Lloyd
Keyword(s):  
Organic Matter ◽  
Microbial Biomass ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Quality Index ◽  
Nitrogen Availability ◽  
Nitrogen Management ◽  
Site Quality ◽  
Urban Landscapes ◽  
Soil Nitrogen Availability

Toward developing nitrogen management in amenity tree care, we studied soil organic matter, microbial biomass, and carbon and nitrogen mineralization in an attempt to characterize the plant available nitrogen under a variety of landscape management conditions. Fine particulate organic matter (POM) fractions were significantly correlated with microbial biomass, carbon mineralization, and nitrogen mineralization (R 2values ranging from 0.42 to 0.89). These urban landscapes were assigned a site quality index based on landscape age and management practices. Fine POM, microbial biomass N, and N mineralization were significantly and positively correlated with the site quality index (R 2values of 0.86, 0.90, and 0.84, respectively). We propose that with refinement and further testing, a fine POM measurement can be used to accurately predict soil nitrogen availability in urban landscapes. This research shows that urban landscapes are quite variable in terms of nitrogen availability. As a result of this variability, we recommend that urban landscapes be assessed on a per-site basis for proper nitrogen management.

Effect of water, temperature and fertilizers on soil nitrogen net transformations and tree growth in an elfin cloud forest of Colombia

2000 ◽  
Vol 16 (1) ◽  
pp. 83-99 ◽  
Author(s):  
Jaime Cavelier ◽  
Edmund Tanner ◽  
Johanna Santamaría
Keyword(s):  
Water Temperature ◽  
Soil Water ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
Cloud Forest ◽  
Mineral Nutrient ◽  
Phosphorus Fertilization ◽  
Nitrogen And Phosphorus ◽  
Soil Nitrogen Availability

(Accepted 31st July 1999)In the ‘elfin’ cloud forest of Serrania de Macuira, exchangeable ammonium and nitrate, and the rates of soil nitrogen mineralization and nitrification were measured in soil samples under different water, temperature and mineral nutrient additions. The effects of nitrogen, phosphorus and nitrogen plus phosphorus fertilization on radial trunk growth were measured in three tree species. In the cloud forest soils, concentrations of ammonium were much higher than those of nitrate. Nitrate was higher in samples collected during the afternoon than during the morning, probably as a result of leaching during the night or nitrification during the day. When samples were incubated under different water and temperature treatments, rates of nitrogen mineralization and nitrification increased more with changes in soil water content than with changes in temperature. Nitrification was significantly increased in soils amended with ammonium or with ammonium plus phosphorus, suggesting that nitrification is substrate-limited. Fertilization with nitrogen and phosphorus resulted in significantly increased girth increments in Guapira fragrans (Dum. -Cours.) Little and Rapanea guianensis Aublet. Myrcianthes fragrans (Sw.) D.C. did not respond to the fertilization. The results of this study support the hypothesis that the characteristics of montane rain forest in small and large tropical mountains (the ‘Massenerhebung’ effect) are greatly controlled by soil water conditions and related soil nitrogen availability.

Impact of soil nitrogen availability and pH on tropical heath forest organic matter decomposition and decomposer activity

Pedobiologia ◽  
2020 ◽  
Vol 80 ◽  
pp. 150645
Author(s):  
Giacomo Sellan ◽  
Jill Thompson ◽  
Noreen Majalap ◽  
Rolando Robert ◽  
Francis Q. Brearley
Keyword(s):  
Organic Matter ◽  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
Organic Matter Decomposition ◽  
Soil Nitrogen Availability ◽  
Heath Forest

Intensive Harvesting and Site Preparation Decrease Soil Nitrogen Availability in Young Plantations

1985 ◽  
Vol 9 (2) ◽  
pp. 120-125 ◽  
Author(s):  
Peter M. Vitousek ◽  
Pamela A. Matson
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
Site Preparation ◽  
Soil Nitrogen Availability ◽  
Net Nitrogen Mineralization ◽  
Reduced Nitrogen ◽  
Whole Tree

Abstract Intensive harvesting and site preparation remove large amounts of nitrogen and other nutrients. The effects of these removals on the nitrogen-supplying power of remaining soil were examined in five 1- to 5-year-old loblolly pine (Pinus taeda) plantation trials. Whole-tree harvest and shear-pile-disk site preparation reduced nitrogen availability relative to stem-only harvest and chop-and-burn preparation. Net nitrogen mineralization during 30-day incubation averaged 7.8 μg N/g of soil in stem-only/chopped plots in the two youngest sites; the corresponding value in the whole-tree/ shear-pile-disk sites was 4.2 μg N/g of soil. Herbicide applications were associated with increased nitrogen availability up to 3 years after the last application.1

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