Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region of Guizhou Province, China

doi:10.1007/s11783-012-0391-1

Front Envir Sci Eng

2012, Vol. 6

Issue (2) : 195-203 https://doi.org/10.1007/s11783-012-0391-1

RESEARCH ARTICLE

Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region of Guizhou Province, China

Xiaoliang LI^1,2, Xiaomin CHEN¹(

), Xia LIU², Lianchuan ZHOU¹, Xinqiang YANG¹

1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China; 2. College of Urban Construction and Environmental Sciences, Anhui Science and Technology University, Fengyang 233100, China

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Abstract

Soil low-molecular-weight (LMW) organic acids play important roles in the soil-forming process and the cycling of nutrients in Karst regions. In this study, we quantified the contents of LMW organic acids (including lactate, acetate, formate, malate, and oxalate) in soil solution over the Karst region of Guizhou Province, China using ion chromatography. The concentration of total LMW organic acids in topsoil solution ranged from 0.358 to 1.823 μmol·g^-1, with an average of 0.912 μmol·g^-1. The mean concentrations of lactate, acetate, formate, malate, and oxalate were 0.212±0.089, 0.302±0.228, 0.301±0.214, 0.014±0.018 and 0.086±0.118 μmol·g^-1, respectively. There were also significant difference in the contents of these acids among four phases of rocky desertification, and their concentrations decreased with the aggravation of rocky desertification. The concentrations of the LMW organic acids were significantly positive correlated each other. Significant positive correlations were also observed among individual LMW organic acids in soil solution, and between them and soil available P, available K, exchangeable Ca, respectively. Furthermore, the concentrations of LMW organic acids were significantly positively correlated with inorganic anions (chlorides, nitrates, and sulfates) in Karst topsoil solution. Therefore, the concentrations of soil LMW organic acids might be one of driving force in the Karst rock desertification process in Guizhou Province.

Keywords Karst rocky desertification low-molecular-weight (LMW) organic acids distribution characteristics soil

Corresponding Author(s): CHEN Xiaomin,Email:xmchen@njau.edu.cn

Issue Date: 01 April 2012

Cite this article:

Xiaomin CHEN,Xia LIU,Lianchuan ZHOU, et al. Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region of Guizhou Province, China[J]. Front Envir Sci Eng, 2012, 6(2): 195-203.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0391-1
https://academic.hep.com.cn/fese/EN/Y2012/V6/I2/195

Tab.1 Grading standards of rocky desertification in Karst mountain area

Tab.2 Phases of rocky desertification for sampling and their biophysical settings

Fig.1 Ion chromatography of organic acid and inorganic anions in soil solution

Tab.3 Soil samples properties in different phases of Karst rocky desertification

Fig.2 Soil LMW organic acid concentrations in Karst rocky desertification area(A) the concentrations of soil LMW organic acid species in Karst topsoils and (B) the soil LMW organic acid concentrations in different phases of rocky desertification. Different letters indicate significant differences between LMW organic acid species and phases of rocky desertification using Duncan’s test (P<0.05). Each bar indicates one standard deviation (sample number is seven)

Fig.3 Distribution of LMW organic acids in soil profile in Karst region. (A) the phase of non-degraded rocky desertification, and (B) the phase of light rocky desertification (Maolan National Nature Reserve)

Tab.4 Correlation efficient () of the correlations between LMW organic acids, organic carbon, available P, available K, and exchangeable Ca in Karst topsoils

Fig.4 Regression analysis of LMW organic acids with Cl, , and in Karst topsoil solution (=28)

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