Publication Date:
2010-02-13
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉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 -- New York, N.Y. -- Science. 2010 Feb 19;327(5968):1008-10. doi: 10.1126/science.1182570. Epub 2010 Feb 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20150447" target="_blank"〉PubMed〈/a〉
Keywords:
*Agriculture
;
Cations
;
China
;
Crops, Agricultural/*growth & development/metabolism
;
Fertilizers
;
Hydrogen-Ion Concentration
;
Nitrogen
;
*Soil
;
Time Factors
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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