The Study of Gaining More Detailed Variability Information of Soil Organic Carbon in Surface Soils and Its Significance to Enriching the Existing Soil Database
| Autor: | Chun-Chih Tsui, Zueng-Sang Chen, Jingzhang Li, Zhongqi Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Soil depth
lcsh:TJ807-830 Geography Planning and Development lcsh:Renewable energy sources Soil science 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences equal-area spline model Soil database lcsh:Environmental sciences 0105 earth and related environmental sciences lcsh:GE1-350 Renewable Energy Sustainability and the Environment lcsh:Environmental effects of industries and plants 04 agricultural and veterinary sciences Soil carbon vertical variation lcsh:TD194-195 soil organic carbon (SOC) soil database Digital soil mapping Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | Sustainability Volume 12 Issue 12 Sustainability, Vol 12, Iss 4866, p 4866 (2020) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su12124866 |
| Popis: | To meet the increasing demands of precision agricultural and environmental management, more abundant and accurate information is needed to describe soil organic carbon (SOC) vertical variation. Based on 923 soil profiles (collected at the depths of 0&ndash 15, 15&ndash 30, 30&ndash 60, 60&ndash 90, 90&ndash 120, and 120&ndash 150 cm) in the central area of Changhua County, Taiwan, the distribution curve of the SOC content of each profile was fitted by the equal-area spline model, and it was possible to obtain the SOC content at all depths. Taking the 0&ndash 5 cm (L1), 5&ndash 10 cm (L2), and 10&ndash 15 cm (L3) sub-layers as examples, their SOC contents and stocks were compared to the mean values of the average 5-cm-thick sub-layers (Lm) derived from the value of the 0&ndash 15 cm layer. The results indicated that the SOC contents and stocks both reduced with increasing soil depths. The mean SOC contents of L1, L2, and L3 were 22.1, 21.0, and 18.7 g kg&minus 1, respectively, with significant variation, and the values of L2 and L3 were 5.0% and 15.4% lower than that of L1. Similarly, the mean SOC stocks were 1.29, 1.25, and 1.16 kg m&minus 2 of the L1, L2, and L3 layers, also with significant variation, and the values of L2 and L3 were 4.0% and 10.1% lower than that of L1. Meanwhile, it was found that the SOC content and stock of Lm were both close to the corresponding values in L2, but were significantly different to that of L1 and L3. Furthermore, the interpolation contours of the SOC contents and stocks in L1, L2, and L3 by digital soil mapping also presented regular variation with increasing soil depths, while the contours of Lm had nearly identical patterns to that of L2. The results demonstrate that the typically used mean SOC contents with certain thicknesses calculated from the sampling layer can only approximately inflect the SOC situation at intermediate depths, but the SOC content in the upper and lower parts within the sampling layer varies greatly. Therefore, the actual distribution of SOC varies gradually depending on the soil depth. This study indicates that the combination of the equal-area spline model and digital soil mapping can greatly enrich the current soil SOC database and provide more abundant and accurate SOC content and stock information for precision agricultural and environmental management based on legacy soil database. |
| Databáze: | OpenAIRE |
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