In:
Scientific Reports, Springer Science and Business Media LLC, Vol. 6, No. 1 ( 2016-06-21)
Abstract:
To gain the effects of N fertilizer applications on N 2 O emissions and local climate change in fertilized rubber ( Hevea brasiliensi s) plantations in the tropics, we measured N 2 O fluxes from fertilized (75 kg N ha −1 yr −1 ) and unfertilized rubber plantations at Xishuangbanna in southwest China over a 2-year period. The N 2 O emissions from the fertilized and unfertilized plots were 4.0 and 2.5 kg N ha −1 yr −1 , respectively and the N 2 O emission factor was 1.96%. Soil moisture, soil temperature and the area weighted mean ammoniacal nitrogen (NH 4 + -N) content controlled the variations in N 2 O flux from the fertilized and unfertilized rubber plantations. NH 4 + -N did not influence temporal changes in N 2 O emissions from the trench, slope, or terrace plots, but controlled spatial variations in N 2 O emissions among the treatments. On a unit area basis, the 100-year carbon dioxide equivalence of the fertilized rubber plantation N 2 O offsets 5.8% and 31.5% of carbon sink of the rubber plantation and local tropical rainforest, respectively. When entire land area in Xishuangbanna is considered, N 2 O emissions from fertilized rubber plantations offset 17.1% of the tropical rainforest’s carbon sink. The results show that if tropical rainforests are converted to fertilized rubber plantations, regional N 2 O emissions may enhance local climate warming.
Type of Medium:
Online Resource
ISSN:
2045-2322
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2016
detail.hit.zdb_id:
2615211-3
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