Assessment of sediment deposition rates in a karst depression of a small catchment in Huanjiang, Guangxi, southwest China, using the cesium-137 technique

2010 ◽  
Vol 65 (4) ◽  
pp. 223-232 ◽  
Author(s):  
H. Li ◽  
X. Zhang ◽  
K. Wang ◽  
A. Wen
Keyword(s):  
Southwest China ◽  
Sediment Deposition ◽  
Deposition Rates ◽  
Small Catchment ◽  
Karst Depression ◽  
Cesium 137

Soil erosion impacts on nutrient deposition in a typical karst watershed

2021 ◽  
Author(s):  
Li Chengfang ◽  
Wang Zhongcheng ◽  
Li Zhenwei ◽  
Xu Xianli
Keyword(s):  
Soil Erosion ◽  
Nutrient Dynamics ◽  
Southwest China ◽  
Clay Content ◽  
Nutrient Concentrations ◽  
Deposition Rates ◽  
Nutrient Deposition ◽  
Peak Cluster ◽  
The Past ◽  
Karst Depression

<p>Soil erosion has a significant influence on nutrient redistribution and deposition. However, the effect of soil erosion on nutrient deposition remains unclear in karst areas such as southwest China, which represents an ecologically fragile zone experiencing severe soil erosion. The objective of this study was to investigate the characteristics of soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) deposition in a karst watershed of southwest China over the past 60 years and evaluate the relationship between soil erosion and nutrient deposition. The peak-cluster depressions in southwest China are typical for the geomorphological type, which is an ideal place to determine the sediment chronology, and the estimation of sediment and nutrient deposition rates. Three soil profiles were excavated in a typical karst depression. The characteristics of <sup>137</sup>Cs, <sup>210</sup>Pb<sub>ex</sub>, particle size distribution, and nutrients at different soil depths were investigated to evaluate the effect of soil erosion on nutrient deposition. Results showed that there was a significant negative correlation between nutrient concentrations and clay content (<em>P</em><0.001). Generally, compared with<sup> 137</sup>Cs, <sup>210</sup>Pb<sub>ex</sub> had a higher correlation with SOC and TN. In an undisturbed sediment profile, Pb/Cs can reflect nutrient dynamics better than a single nuclide. The nutrient deposition rates increased before 1953, reached its maximum in 1954-1956, and then dropped rapidly from 1957 to 2015. The sediment deposition rates were negatively correlated with nutrient concentrations (<em>P</em><0.01), but had a positive influence on nutrient deposition rates (<em>P</em><0.01). This implies that the temporal variation in nutrient deposition rates over the past 60 years was dominated by soil erosion rather than nutrient concentrations. This study provides a new insight to explore the historical nutrient deposition rates in a peak-cluster karst depression, and may help effectively control soil erosion and sustainable development of agro-ecosystems.</p>

Recent sediment deposition rates in the oyster ground, North Sea

1989 ◽  
Vol 23 (3) ◽  
pp. 263-269 ◽  
Author(s):  
Z. Zuo ◽  
D. Eisma ◽  
G.W. Berger
Keyword(s):  
North Sea ◽  
Sediment Deposition ◽  
Recent Sediment ◽  
Deposition Rates ◽  
Oyster Ground

Deposition Rates in Valleys Determined Using Fallout Cesium-137

1975 ◽  
Vol 86 (8) ◽  
pp. 1128 ◽  
Author(s):  
JERRY C. RITCHIE ◽  
PAUL H. HAWKS ◽  
J. ROGER McHENRY
Keyword(s):  
Deposition Rates ◽  
Cesium 137

Sediment deposition rates on the continental margins of the eastern Arabian Sea using 210Pb, 137Cs and 14C

1999 ◽  
Vol 237-238 ◽  
pp. 429-439 ◽  
Author(s):  
B.L.K. Somayajulu ◽  
R. Bhushan ◽  
Ashish Sarkar ◽  
G.S. Burr ◽  
A.J.T. Jull
Keyword(s):  
Arabian Sea ◽  
Sediment Deposition ◽  
Continental Margins ◽  
Deposition Rates ◽  
Eastern Arabian Sea
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