All Title Author
Keywords Abstract


A Brief Study on Using pHH2O to Predict pHKCl for Acid Soils

DOI: 10.4236/as.2019.102012, PP. 142-149

Keywords: Predicting Model, pHKCl, pHH2O, Correlation, Influential Factors, Acid Soil

Full-Text   Cite this paper   Add to My Lib

Abstract:

pHKCl and pHH2O are two basic necessary indexes to reflect the acidity of asoil. Predicting pHKCl?directly from pHH2O?could save the cost of laboratory work. In this study, the values of pHKCl and of 442 and 310 horizon samples from 126 and 98 soil profiles (0 - 120 cm in depth) surveyed from 2014 to 2015 in Guangxi and Yunnan were used to establish the optimal correlation model between pHKCl and pHH2O. The results showed that: 1) pHKCl is lower than pHH2O, pHKCl?was 0.07 - 1.99 units with a mean of 0.99 units lower than for Guangxi, while 0.03 - 1.90 units with a mean of 0.89 lower than pHH2O?for Yunan. 2) There is significant positive correlation between pHKCl?and pHH2O, the optimal correlation models between pHKCl?(y) and pHH2O?(x) for Guangxi and Yunnan are y = 0.1963x2 1.0512x + 4.338, R2 = 0.836, p < 0.01 and y = 1.5882e0.1859x, R2 = 0.769, p < 0.01, respectively, and the values of MAE and RSME of the models are 0.13 and 0.36 for Guangxi, 0.08 and 0.28 for Yunnan, respectively. There are significant negative correlations between pHKCl?with exchangeable H+ and Al3+ (R2 = 0.487, 0.716, p < 0.01), and pH

References

[1]  Zhang, G.L. and Gong, Z.T., Eds. (2012) Soil Survey Laboratory Methods. Science Press, Beijing. (In Chinese)
[2]  Soil Survey Staff (2010) Keys to Soil Taxonomy. 11th Edition, USDA, Washington DC.
[3]  Cooperative Research Group on Chinese Soil Taxonomy (2001) Chinese Soil Taxonomy. Science Press, Beijing & New York.
[4]  Lin, Y.X. and Yu, T.R. (1958) Relationship between Acidity with Exchangeable H+ and Al3+. Acta Pedologica Sinica, 5, 234-246. (in Chinese)
[5]  Kong, X. L. and Ji, G.L. (1992) Relationship between Acidity with Exchangeable H+ and Al3+ of Soils in South Chinese. Chinese Journal of Soil Science, 23, 203-204. (In Chinese)
[6]  Fan, Q.F., Zhang, Y.L., Chen, Z., et al. (2009) Acidity Characteristics and Acidification Mechanism of Soils in Protected Fields. Acta Pedologica Sinica, 46, 466-471. (In Chinese)
[7]  Deng, X.H., Li, Y.H., Zhou, M.L., et al. (2018) Acidity Characteristics and Influencing Factors of Tobacco-Planting Soils in Wuling Mountains—A Case Study in Xiangxi Autonomic Prefectural, Hunan Province. Journal of Soil and Water Conservation, 32, 304-309. (In Chinese)
[8]  Wu, Z.D., Jiang, F.Y., You, Z.M., et al. (2016) Acidic Characteristics of Subtropical Tea Garden Soil: A Case Study in Wuyishan City, Fujian Province, Southeast China. China Environmental Science, 36, 181-189. (In Chinese)
[9]  Sun, H.D., Liu, B., Wu, B.S., et al. (2016) Characteristics and Causes of Soil Acidification in the Rubber Plantation. Journal of Northwest Forestry University, 31, 49-54. (In Chinese)
[10]  Xiong, Y. and Li, Q.K. (1990) Soil of China. 2nd Edition, Science Press, Beijing. (In Chinese)
[11]  Huang, C.Y. (2000) Soil Science. China Agriculture Press, Beijing. (In Chinese)
[12]  Yu, J.Y. and He, X.X. (2006) Data Statistical Analysis and SPSS Application. Posts & Telecommunications Press, Beijing. (In Chinese)
[13]  Krug, E.C. and Frink, C.R. (1983) Acid Rain on Acid Soil—A New Perspective. Science, 221, 520-525.
https://doi.org/10.1126/science.221.4610.520
[14]  van Breemen, N., Driscoll, C.T. and Mulder, J. (1984) Acidic Deposition and Internal Proton Sources in Acidification of Soils and Waters. Nature, 307, 599-604.
[15]  Ulrich, B. and Sumner, M. E. (1991) Soil Acidity. Springer-Verlag, Berlin.
https://doi.org/10.1007/978-3-642-74442-6
[16]  Xu, R.K., Coventry, D.R., Farhoodi, A., et al. (2002) Soil Acidification as Influenced by Crop Rotations, Stubble Management, and Application of Nitrogenous Fertiliser, Tarlee, South Australia. Australian Journal of Soil Research, 40, 483-496.
https://doi.org/10.1071/SR00104
[17]  Schroder, J.L., Zhang, H.L., Girma, K., et al. (2011) Soil Acidification from Long-Term Use of Nitrogen Fertilizers on Winter Wheat. Soil Science Society of America Journal, 75, 957-964.
https://doi.org/10.2136/sssaj2010.0187
[18]  Guo, J.H., Liu, X.J., Zhang, Y., et al. (2010) Significant Acidification in Major Chinese Croplands. Science, 327, 1008-1010.
https://doi.org/10.1126/science.1182570
[19]  Xu, R.K. (2015) Research Progresses in Soil Acidification and Its Control. Soils, 47, 238-244. (In Chinese)
[20]  Reuss, J.O. and Johnson, D.W. (1986) Acid Deposition and the Acidification of Soils and Waters. Springer-Verlag, Berlin.
https://doi.org/10.1007/978-1-4419-8536-1
[21]  Huang, P.M. (1997) Mechanism of Soil Acidification. In: Dahama, A.K., Ed., Agro’s Ann. Rev. of Crop Ecology, Agro Botanica, Bikaner, 79-100.
[22]  Yu, T.R. (1997) Chemistry of Variable Charge Soils. Oxford University Press, New York.

Full-Text

comments powered by Disqus