Proton accumulation accelerated by heavy chemical nitrogen fertilization and its long-term impact on acidifying rate in a typical arable soil in the Huang-Huai-Hai Plain

HUANG Ping; ZHANG Jia-bao; XIN Xiu-li; ZHU An-ning; ZHANG Cong-zhi; MA Dong-hao; ZHU Qiang-gen; YANG Shan; WU Sheng-jun

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Proton accumulation accelerated by heavy chemical nitrogen fertilization and its long-term impact on acidifying rate in a typical arable soil in the Huang-Huai-Hai Plain

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Cropland productivity has been signiifcantly impacted by soil acidiifcation resulted from nitrogen (N) fertilization, especialy as a result of excess ammoniacal N input. With decades’ intensive agricultural cultivation and heavy chemical N input in the Huang-Huai-Hai Plain, the impact extent of induced proton input on soil pH in the long term was not yet clear. In this study, acidiifcation rates of different soil layers in the soil proifle (0–120 cm) were calculated by pH buffer capacity (pHBC) and net input of protons due to chemical N incorporation. Topsoil (0–20 cm) pH changes of a long-term fertilization ifeld (from 1989) were determined to validate the predicted values. The results showed that the acid and alkali buffer capacities varied signiifcantly in the soil proifle, averaged 692 and 39.8 mmolc kg–1 pH–1, respectively. A signiifcant (P<0.05) correlation was found between pHBC and the content of calcium carbonate. Based on the commonly used application rate of urea (500 kg N ha–1 yr–1), the induced proton input in this region was predicted to be 16.1 kmol ha–1 yr–1, and nitriifcation and plant uptake of nitrate were the most important mechanisms for proton producing and consuming, respectively. The acidiifcation rate of topsoil (0–20 cm) was estimated to be 0.01 unit pH yr–1 at the assumed N fertilization level. From 1989 to 2009, topsoil pH (0–20 cm) of the long-term fertilization ifeld decreased from 8.65 to 8.50 for the PK (phosphorus, 150 kg P2O5 ha–1 yr–1;potassium, 300 kg K2O ha–1 yr–1; without N fertilization), and 8.30 for NPK (nitrogen, 300 kg N ha–1 yr–1; phosphorus, 150 kg P2O5 ha–1 yr–1; potassium, 300 kg K2O ha–1 yr–1), respectively. Therefore, the apparent soil acidiifcation rate induced by N fertilization equaled to 0.01 unit pH yr–1, which can be a reference to the estimated result, considering the effect of atmospheric N deposition, crop biomass, ifeld management and plant uptake of other nutrients and cations. As protons could be consumed by some ifeld practices, such as stubble return and coupled water and nutrient management, soil pH would maintain relatively stable if proper management practices can be adopted in this region.

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《农业科学学报（英文版）》 |2015年第1期|148-157|共10页
作者
HUANG Ping; ZHANG Jia-bao; XIN Xiu-li; ZHU An-ning; ZHANG Cong-zhi; MA Dong-hao; ZHU Qiang-gen; YANG Shan; WU Sheng-jun;
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Fengqiu Agro-Ecological Experimental Station, State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

Fengqiu Agro-Ecological Experimental Station, State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

Fengqiu Agro-Ecological Experimental Station, State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

Fengqiu Agro-Ecological Experimental Station, State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

Fengqiu Agro-Ecological Experimental Station, State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

Fengqiu Agro-Ecological Experimental Station, State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

Fengqiu Agro-Ecological Experimental Station, State Key Laboratory of Soil Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Inteligent Technology, Chinese Academy of Sciences, Chongqing 400714, P.R.China;

Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Inteligent Technology, Chinese Academy of Sciences, Chongqing 400714, P.R.China;

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Proton accumulation accelerated by heavy chemical nitrogen fertilization and its long-term impact on acidifying rate in a typical arable soil in the Huang-Huai-Hai Plain

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