Evaluation of soil erosion and sediment deposition rates by the 137 Cs fingerprinting technique at different hillslope p
- PDF / 1,171,300 Bytes
- 13 Pages / 547.087 x 737.008 pts Page_size
- 64 Downloads / 227 Views
Evaluation of soil erosion and sediment deposition rates by the 137Cs fingerprinting technique at different hillslope positions on a catchment Yanqing Li & Zhongcheng Jiang & Yang Yu & Zhijie Shan & Funing Lan & Xiangfei Yue & Peng Liu & Yeboah Gyasi-Agyei & Jesús Rodrigo-Comino
Received: 12 May 2020 / Accepted: 13 October 2020 # Springer Nature Switzerland AG 2020
Abstract Assessment of the variation of soil erosion and sediment mobilization at different hillslope positions using the 137Cs tracing technique has been carried out for the Dapotou closed watershed, a representative depression in the karst gabin basin in Southwest China. The results showed that the annual soil erosion rates in the shoulders, backslopes, and footslopes were 0.87, Y. Li : Z. Jiang : F. Lan : X. Yue : P. Liu Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China Y. Li : Z. Jiang : F. Lan : X. Yue : P. Liu Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Guilin 541004, China Y. Yu (*) School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China e-mail: [email protected] Z. Shan Department of Sediment Research, China Institute of Water Resources and Hydropower Research, Beijing 100038, China Y. Gyasi-Agyei School of Engineering and Built Environment, Griffith University, Nathan, Queensland 4111, Australia J. Rodrigo-Comino Department of Physical Geography, University of Trier, 54296 Trier, Germany J. Rodrigo-Comino Soil Erosion and Degradation Research Group, Department of Geography, Valencia University, Blasco Ibàñez, 28, 46010 Valencia, Spain
0.35 and 0.49 cm year−1, respectively, while the soil sediment deposition rate in the depression bottom was 2.68 cm year−1. The average annual soil erosion modulus of the complete hillslope was 632 t km−2year−1, which confirmed the seriousness of erosion according to the gradation of the karst soil erosion standards. For the whole catchment, the sediment delivery ratio was estimated as 0.82. To identify which factor could play the most important role in influencing the estimates using 137Cs, a linear correlation and principal component analysis were conducted. The results showed that 137 Cs concentrations at different soil depths of the different hillslope positions were significantly correlated with soil organic matter and total nitrogen (P < 0.05). As this watershed is a typical karst geomorphological type, these findings are expected to provide data support for larger watershed soil erosion management and ecological restoration in fragile karst ecosystems. Keywords Soil erosion . 137Cs . Geomorphology . Karst gabin basin . Principal component analysis
Introduction Soil erosion has been identified as a global geoenvironmental hazard (Nearing et al. 2005; Salesa et al. 2019; Prise et al. 2009; Panagos et al. 2014). Due to the nutrient-poor characteristics of carbonate-rock parent materials, the effects of soil erosion are greater in karst areas, which occupy approximately 12% of global continental terrains
Data Loading...
