+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Net nitrogen mineralization and net nitrification rates in soils following deforestation for pasture across the southwestern Brazilian Amazon Basin landscape

, : Net nitrogen mineralization and net nitrification rates in soils following deforestation for pasture across the southwestern Brazilian Amazon Basin landscape. Oecologia (Berlin) 110(2): 243-252

Previous studies of the effect of tropical forest conversion to cattle pasture on soil N dynamics showed that rates of net N mineralization and net nitrification were lower in pastures compared with the original forest. In this study, we sought to determine the generality of these patterns by examining soil inorganic N concentrations, net mineralization and nitrification rates in 6 forests and 11 pastures 3 years old or older on ultisols and oxisols that encompassed a wide variety of soil textures and spanned a 700-km geographical range in the southwestern Brazilian Amazon Basin state of Rondonia. We sampled each site during October-November and April-May. Forest soils had higher extractable NO-3--N and total inorganic N concentrations than pasture soils, but substantial NO-3--N occurred in both forest and pasture soils. Rates of net N mineralization and net nitrification were higher in forest soils. Greater concentrations of soil organic matter in finer textured soils were associated with greater rates of net N mineralization and net nitrification, but this relationship was true only under native forest vegetation; rates were uniformly low in pastures, regardless of soil type or texture. Net N mineralization and net nitrification rates per unit of total soil organic matter showed no pattern across the different forest sites, suggesting that controls of net N mineralization may be broadly similar across a wide range of soil types. Similar reductions in rates of net N transformations in pastures 3 years old or older across a range of textures on these soils suggest that changes to soil N cycling caused by deforestation for pasture may be Basin-wide in extent. Lower net N mineralization and net nitrification rates in established pastures suggest that annual N losses from largely deforested landscapes may be lower than losses from the original forest. Total ecosystem N losses since deforestation are likely to depend on the balance between lower N loss rates from established pastures and the magnitude and duration of N losses that occur in the years immediately following forest clearing.


DOI: 10.1007/s004420050157

Other references

Wang, H.; Sun, J., 2003: Investigation and evaluation on the harmfulness of partial vibration and the contact vibration time. The harmfulness from partial vibration with extended contact vibration time was studied by investigating into the symptoms and signs of workers with local vibration disease in Taiyuan Iron & Steel Company. The sense of hand, the function of ne...

Kasmel, A.; Andersen, P.Tanggaard., 2011: Measurement of community empowerment in three community programs in Rapla (Estonia). Community empowerment approaches have been proven to be powerful tools for solving local health problems. However, the methods for measuring empowerment in the community remain unclear and open to dispute. This study aims to describe how a context...

Tsai, A.L.; Palmer, G., 1986: The role of phospholipids in the binding of antimycin to yeast Complex III. Treatment of yeast Complex III with hexane or repeated fractionation with ammonium sulfate-cholate abolishes the ability of antimycin to bind to the complex. Antimycin binding is partially restored by addition of phospholipids to the depleted comp...

Cassaday, J.; Shah, T.; Murray, J.; O'Donnell, G.T.; Kornienko, O.; Strulovici, B.; Ferrer, M.; Zuck, P., 2007: Miniaturization and automation of an ubiquitin ligase cascade enzyme-linked immunosorbent assay in 1,536-well format. Enzyme-linked immunosorbent assays (ELISAs) are a long established and widely used assay format for drug discovery and diagnostics. They offer many advantages over homogeneous assay formats, including high sensitivity and separation (wash) steps t...

Donatelli, M.; Bellocchi, G.; Carlini, L., 2006: Sharing knowledge via software components: Models on reference evapotranspiration. Evapotranspiration (ET) is a cross-platform software component containing routines to estimate daily and hourly values of reference evapotranspiration (and related variables) according to alternative approaches. A standardized form of the FAO-56 i...

Bertin P.; Lapicque F.; Payan E.; Netter P.; Treves R.; Rigaud M.; Bailleul F., 1991: Clinical efficacy plasma and synovial levels effect on eicosanoids interleukin 1 beta hyaluronic acid of sodium naproxen during rheumatoid arthritis. Clinical Pharmacology & Therapeutics 49(2): 168

Fischer, E., 1986: Enthetic reactions of the hand in progressive scleroderma. Frequent bone changes in progressive systemic sclerosis are the marginal osteolysis, the arthritic erosions and also the reactions at the numerous entheses of the hand, where the resorptive reactions predominate the osteoproliferative ones. The mo...

Darsie, Richard F.Jr, 1997: Description of the pupa of Aedes pseudotaeniatus. The pupal stage of Aedes pseudotaeniatus (Giles) is described for the first time. Collections of this species were made in the Himalayan Kingdom of Nepal. Group E of subgenus Finlaya is discussed.

Rignault, D.; Pailler, J.L.; Brillac, J.; Essioux, H.; Bon, J.C., 1977: Nonsurgical treatment of pilonidal fistulas by the curettage-phenolization method. Gastroenterologie Clinique et Biologique 1(11): 941-944

Barrick, J.E.; Breaker, R.R., 2006: The power of riboswitches. Scientific American 296(1): 50-57