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- Title
Uncertainty assessment for mapping changes in soil organic matter using sparse legacy soil data and dense new-measured data in a typical black soil region of China.
- Authors
Zhao, Yongcun; Xu, Xianghua; Hai, Nan; Huang, Biao; Zheng, Hailong; Deng, Wenjing
- Abstract
A total of 89 legacy soil organic matter (SOM) data (0-20 cm) sourced from the soil survey in 1980 in Hailun County of Northeastern China and 268 SOM data (0-20 cm) measured in the area in 2008 were collected in this study. The most straightforward mapping methods such as ordinary kriging (OK), inverse distance weighting interpolation (IDW), and the soil type-based method (ST) were used to derive the spatial patterns of changes in SOM; and the uncertainties associated with the mapping methods were quantitatively assessed through the uncertainty intervals of SOM realizations that were generated by sequential Gaussian simulation and/or Monte Carlo simulation. Results showed that the overall trend of changes in SOM over the last 28 years in the area decreased. The spatial patterns of changes in SOM derived by OK-OK (abbreviations before and after the dash represent the mapping method for SOM data in 2008 and 1980, respectively) and IDW-OK, OK-IDW and IDW-IDW, OK-ST and IDW-ST are similar. The change map obtained by the ST-ST method is also similar to those derived by OK-ST and IDW-ST methods, but local details of changes in SOM presented by the ST-ST method are coarser than those obtained by the OK-ST and IDW-ST methods. The OK-ST method, with an uncertainty tradeoff compared to the OK-OK and ST-ST methods, can be considered as the most suitable method for mapping changes in SOM in the area due to the limited legacy soil survey data and inaccurate sample location information records in the area.
- Subjects
CHINA; SOIL mapping; ORGANIC compound content of soils; ACQUISITION of data; BLACK cotton soil; SOIL surveys
- Publication
Environmental Earth Sciences, 2015, Vol 73, Issue 1, p197
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-014-3411-6