辽河流域土壤酸化与作物籽实镉生物效应的地球化学预警

Journal of Jilin University(Earth Science Edition) ›› 2012, Vol. 42 ›› Issue (6): 1889-1895.

Geochemical Early Warning for Soil Acidification and Its Adverse Biological Effect of Cd in Rice and Maize Seeds in the Catchment Area of Liaohe, Liaoning Province

Cheng Hang-xin^1,2，Yang Xiao-bo³，Li Kuo^1,2，Liu Fei^1,2，Yang Ke^1,2，Nie Hai-feng^1,2，Peng Min^1,2，Zhao Chuan-dong^1,2，Liu Ying-han^1,2

1．Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth’s Critical Zone，CAGS, Langfang065000, Hebei, China;
2．Institute of Geophysical & Geochemical Exploration, CAGS, Langfang065000, Hebei, China;
3．The Liaoning Institute of Geological Survey, Shenyang110032

Received:2012-06-14 Online:2012-12-26 Published:2012-11-26

Abstract

Abstract: The impact of acidified soil and the subsequent effects on terrestrial ecosystems has raised public concern and become a hot research topic over the past decade. From 2002 to 2004, a systematic soil geochemical survey was conducted with the aim of studying the changing trend of the soil chemical elements in the catchment area of Liaohe in Liaoning Province. The results showed that the pH is unaffected by acid inputs when CaO+K₂O concentration in soil is more than 3.86%, which may buffer against the acidity inputs, whereas the soil pH drops rapidly when CaO+K₂O concentration in soil is lower than 3.86%. A map of buffering ability was developed, and it predicted that the soil in the eastern region of Liaohe catchment is much more vulnerable to further acidification. We then discuss the effects of increased Cd leaching upon soil acidic processes, biogeochemical processes, areas susceptible to Cd in rice and maize seeds are manifested.

Key words: soil acidification, cadmium, staple crops, geochemical early warning, catchment area of Liaohe

CLC Number:

P595

Cheng Hang-xin，Yang Xiao-bo，Li Kuo，Liu Fei，Yang Ke，Nie Hai-feng，Peng Min，Zhao Chuan-dong，Liu Ying-han. Geochemical Early Warning for Soil Acidification and Its Adverse Biological Effect of Cd in Rice and Maize Seeds in the Catchment Area of Liaohe, Liaoning Province[J].Journal of Jilin University(Earth Science Edition), 2012, 42(6): 1889-1895.

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Geochemical Early Warning for Soil Acidification and Its Adverse Biological Effect of Cd in Rice and Maize Seeds in the Catchment Area of Liaohe, Liaoning Province

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