Emission of nitrous oxide and carbon dioxide from semi-arid tropical soils in Chiapas México

Revista Brasileira de Ciência do Solo

Alejandro Ponce-mendoza²  Juan Manuel Ceballos-ramírez²  Federico Gutierrez-micelli¹  Luc Dendooven² 

[1] ,GIB Laboratory of Soil Ecology Ciudad de México,México

关键词: Acacia angustissima;    denitrification;    nitrification;    soil water content;    urea;    Acacia angustissima;    desnitrificação;    nitrificação;    teor de água do solo;    ureia;   

DOI  :  10.1590/S0100-06832010000500015

来源: SciELO

【 摘 要 】

The semi-arid region of Chiapas is dominated by N2 -fixing shrubs, e.g., Acacia angustissima. Urea-fertilized soil samples under maize were collected from areas covered and uncovered by A. angustissima in different seasons and N2O and CO2 emissions were monitored. The objective of this study was to determine the effects of urea and of the rainy and dry season on gas emissions from semi-arid soil under laboratory conditions. Urea and soil use had no effect on CO2 production. Nitrons oxide emission from soil was three times higher in the dry than in the rainy season, while urea fertilization doubled emissions. Emissions were twice as high from soil sampled under A. angustissima canopy than from arable land, but 1.2 lower than from soil sampled outside the canopy, and five times higher from soil incubated at 40 % of the water-holding capacity (WHC) than at soil moisture content, but 15 times lower than from soil incubated at 100 WHC. It was found that the soil sampling time and water content had a significant effect on N2O emissions, while N fertilizer and sampling location were less influent.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License