Significant acidification in major Chinese croplands.
Science
; 327(5968): 1008-10, 2010 Feb 19.
Article
en En
| MEDLINE
| ID: mdl-20150447
ABSTRACT
Soil acidification is a major problem in soils of intensive Chinese agricultural systems. We used two nationwide surveys, paired comparisons in numerous individual sites, and several long-term monitoring-field data sets to evaluate changes in soil acidity. Soil pH declined significantly (P < 0.001) from the 1980s to the 2000s in the major Chinese crop-production areas. Processes related to nitrogen cycling released 20 to 221 kilomoles of hydrogen ion (H+) per hectare per year, and base cations uptake contributed a further 15 to 20 kilomoles of H+ per hectare per year to soil acidification in four widespread cropping systems. In comparison, acid deposition (0.4 to 2.0 kilomoles of H+ per hectare per year) made a small contribution to the acidification of agricultural soils across China.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Suelo
/
Productos Agrícolas
/
Agricultura
País/Región como asunto:
Asia
Idioma:
En
Revista:
Science
Año:
2010
Tipo del documento:
Article
País de afiliación:
China