Spatio-temporal Variation of pH in Cropland of Jiangxi Province in the Past 30 Years and Its Relationship with Acid Rain and Fertilizer Application

LI Wei-feng, YE Ying-cong, ZHU An-fan, RAO Lei, SUN Kai, YUAN Jie, GUO Xi

JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (11) : 1942-1953.

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JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (11) : 1942-1953. DOI: 10.11849/zrzyxb.20161089
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Spatio-temporal Variation of pH in Cropland of Jiangxi Province in the Past 30 Years and Its Relationship with Acid Rain and Fertilizer Application

  • LI Wei-feng1, YE Ying-cong1, ZHU An-fan2, RAO Lei1, SUN Kai1, YUAN Jie1, GUO Xi1
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Abstract

Soil acidification has become the most common problem of the world's farmland. Cropland soil acidification causes serious damage to Chinese food security and agricultural sustainable development. This study, which was based on the two periods of pH data during the second soil survey in 1980S (1979-1986) and during the soil testing and formulated fertilization in 2010S (2005-2012), analyzed the spatio-temporal variation of pH in cropland soil of Jiangxi Province in the past 30 years and its relations with nitrogen fertilizer application and acid rain. The results showed that the pH value of cropland in Jiangxi Province presented a trend of acidification. The average pH value of cropland soil in Jiangxi Province was 5.24 in 2010S, decrease 0.53 compared with that in 1980S. Acidification is more serious in southwest of the province. The most prominent area of acidification is Ganzhou City, followed by Nanchang City and Yingtan City, where the average pH value fell more than 0.8 units. According to linear regression, the acidification of cropland soil is closely related to the nitrogen application rate and acid rain. The long-term excessive application of nitrogen fertilizer is the main reason of soil acidification in Jiangxi Province. Cropland soil acidification was positively correlated with nitrogen application rate. Soil pH of cropland declined 0.26 unit with nitrogen application rate increasing 50 kg/hm2 in the past 30 years. Cropland soil acidification has negative correlation with the pH value of acid rain. The lower the pH value of acid rain, the faster the acidification of cropland.

Key words

acid rain / cropland pH / Jiangxi Province / nitrogen application rate / soil

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LI Wei-feng, YE Ying-cong, ZHU An-fan, RAO Lei, SUN Kai, YUAN Jie, GUO Xi. Spatio-temporal Variation of pH in Cropland of Jiangxi Province in the Past 30 Years and Its Relationship with Acid Rain and Fertilizer Application[J]. JOURNAL OF NATURAL RESOURCES, 2017, 32(11): 1942-1953 https://doi.org/10.11849/zrzyxb.20161089

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Funding

National Natural Science Foundation of China, No.41361049; Natural Science Foundation of Jiangxi Province, No.20122BAB204012; Ganpo “555” Talent Research Funds of Jiangxi Province, No.201295
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