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Changes in Soil C, N, and P Concentrations and Stoichiometry in Karst Trough Valley Area under Ecological Restoration: The Role of Slope Aspect, Land Use, and Soil Depth

College of Resources and Environment, Southwest University, Chongqing 400715, China
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Forests 2021, 12(2), 144; https://doi.org/10.3390/f12020144
Received: 29 December 2020 / Revised: 15 January 2021 / Accepted: 25 January 2021 / Published: 26 January 2021
(This article belongs to the Section Forest Ecology and Management)
This study aims to investigate the roles of slope aspect, land use and soil depth in altering the soil organic carbon (C), total nitrogen (N), and total phosphorus (P) traits in the karst trough valley area experiencing extensive ecological restoration. A total of 54 soil samples were collected at 0–10, 10–20, and 20–30 cm soil depths from secondary forest, plantation forest, and grassland on the relatively more shaded east-facing slope and the contrasting west-facing slope, respectively. The independent and interactive effects of slope aspect, land use, and soil depth on soil C, N, and P concentrations and stoichiometry were determined. The results show that soil C and N concentrations were markedly higher on the east-facing slope than on the west-facing slope, and soil P concentrations showed an opposite trend, leading to significant differences in soil C:P and N:P but not in C:N ratios between the two aspects. Soil C and N concentrations were not affected by land use, and soil P concentration was significantly higher in plantation forest than in secondary forest and grassland. Soil C and N concentrations significantly decreased with increasing soil depth, but soil P concentration presented no significant changes with soil depth. Both the land use and soil depth did not differ in terms of their elemental stoichiometry. There were no significant interactive effects of slope aspect, land use and soil depth on soil C, N, and P traits. Our results indicate that soil C, N, and P changes are more sensitive to slope aspect rather than land use and soil depth in the karst trough valley area under ecological restoration. View Full-Text
Keywords: stoichiometric ratio; topography; human activities; karst area stoichiometric ratio; topography; human activities; karst area
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MDPI and ACS Style

Li, T.; Zeng, J.; He, B.; Chen, Z. Changes in Soil C, N, and P Concentrations and Stoichiometry in Karst Trough Valley Area under Ecological Restoration: The Role of Slope Aspect, Land Use, and Soil Depth. Forests 2021, 12, 144. https://doi.org/10.3390/f12020144

AMA Style

Li T, Zeng J, He B, Chen Z. Changes in Soil C, N, and P Concentrations and Stoichiometry in Karst Trough Valley Area under Ecological Restoration: The Role of Slope Aspect, Land Use, and Soil Depth. Forests. 2021; 12(2):144. https://doi.org/10.3390/f12020144

Chicago/Turabian Style

Li, Tianyang; Zeng, Jiangmin; He, Binghui; Chen, Zhanpeng. 2021. "Changes in Soil C, N, and P Concentrations and Stoichiometry in Karst Trough Valley Area under Ecological Restoration: The Role of Slope Aspect, Land Use, and Soil Depth" Forests 12, no. 2: 144. https://doi.org/10.3390/f12020144

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