Details

Autor(en) / Beteiligte

• Guo, J.H
• Liu, X.J
• Zhang, Y
• Shen, J.L
• Han, W.X
• Zhang, W.F
• Christie, P
• Goulding, K.W.T
• Vitousek, P.M
• Zhang, F.S

Titel

Significant Acidification in Major Chinese Croplands

Ist Teil von

• Science (American Association for the Advancement of Science), 2010-02, Vol.327 (5968), p.1008-1010

Ort / Verlag

Washington, DC: American Association for the Advancement of Science

Erscheinungsjahr

2010

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• 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.