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Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
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Significant acidification in major Chinese croplands.

J H Guo1, X J Liu, Y Zhang

  • 1College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.

Science (New York, N.Y.)
|February 13, 2010
PubMed
Summary
This summary is machine-generated.

Intensive farming in China has led to significant soil acidification, with nitrogen cycling and cation uptake being primary drivers. Acid deposition contributes minimally to this widespread agricultural soil problem.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • Soil acidification is a critical issue in China's intensive agricultural systems.
  • Declining soil pH poses a threat to crop production and soil health.

Purpose of the Study:

  • To evaluate changes in soil acidity across major Chinese crop-production areas.
  • To identify the primary drivers of soil acidification in these agricultural soils.

Main Methods:

  • Utilized two nationwide surveys to assess soil pH changes.
  • Employed paired comparisons at numerous sites and analyzed long-term monitoring data.
  • Quantified contributions of nitrogen cycling and base cation uptake to soil acidification.

Main Results:

  • Soil pH significantly declined from the 1980s to the 2000s in key agricultural regions (P < 0.001).
  • Nitrogen cycling processes released 20–221 kmol H+ per hectare per year.
  • Base cation uptake contributed an additional 15–20 kmol H+ per hectare per year.
  • Acid deposition contributed minimally (0.4–2.0 kmol H+ per hectare per year).

Conclusions:

  • Intensive agricultural practices, particularly nitrogen cycling and base cation uptake, are the main drivers of soil acidification in China.
  • Acid deposition plays a minor role in the acidification of Chinese agricultural soils.
  • Urgent management strategies are needed to mitigate soil acidification and sustain agricultural productivity.