Soil erosion modelled with USLE and PESERA using QuickBird derived vegetation parameters in an alpine catchment     

K. Meusburger  N. KonzM. Schaub  C. Alewell 《International Journal of Applied Earth Observation and Geoinformation》2010

The focus of soil erosion research in the Alps has been in two categories: (i) on-site measurements, which are rather small scale point measurements on selected plots often constrained to irrigation experiments or (ii) off-site quantification of sediment delivery at the outlet of the catchment. Results of both categories pointed towards the importance of an intact vegetation cover to prevent soil loss. With the recent availability of high-resolution satellites such as IKONOS and QuickBird options for detecting and monitoring vegetation parameters in heterogeneous terrain have increased. The aim of this study is to evaluate the usefulness of QuickBird derived vegetation parameters in soil erosion models for alpine sites by comparison to Cesium-137 (Cs-137) derived soil erosion estimates. The study site (67 km²) is located in the Central Swiss Alps (Urseren Valley) and is characterised by scarce forest cover and strong anthropogenic influences due to grassland farming for centuries. A fractional vegetation cover (FVC) map for grassland and detailed land-cover maps are available from linear spectral unmixing and supervised classification of QuickBird imagery. The maps were introduced to the Pan-European Soil Erosion Risk Assessment (PESERA) model as well as to the Universal Soil Loss Equation (USLE). Regarding the latter model, the FVC was indirectly incorporated by adapting the C factor. Both models show an increase in absolute soil erosion values when FVC is considered. In contrast to USLE and the Cs-137 soil erosion rates, PESERA estimates are low. For the USLE model also the spatial patterns improved and showed “hotspots” of high erosion of up to 16 t ha⁻¹ a⁻¹. In conclusion field measurements of Cs-137 confirmed the improvement of soil erosion estimates using the satellite-derived vegetation data.  相似文献   

Subsurface flow processes in sloping cropland of purple soil   总被引：3，自引：1，他引：2  

LIN Henry 《山地科学学报》2012,9(1):1-9

Subsurface flow is a prominent runoff process in sloping lands of purple soil in the upper Yangtze River basin.However,it remains difficult to identify and quantify.In this study,in situ runoff experimental plots were used to measure soil moisture dynamics using an array of time domain reflectometry(TDR) together with overland flow and subsurface flow using isolated collecting troughs.Frequency of preferential flow during rainfall events and the controls of subsurface flow processes were investigated through combined analysis of soil properties,topography,rainfall intensity,initial wetness,and tillage.Results showed that subsurface flow was ubiquitous in purple soil profiles due to welldeveloped macropores,especially in surface soils while frequency of preferential flow occurrence was very low(only 2 cases in plot C) during all 22 rainfall events.Dry antecedent moisture conditions promoted the occurrence of preferential flow.However,consecutive real-time monitoring of soil moisture at different depths and various slope positions implied the possible occurrence of multiple subsurface lateral flows during intensive storms.Rainfall intensity,tillage operation,and soil properties were recognized as main controls of subsurface flow in the study area,which allows the optimization of management practices for alleviating adverse environmental effects of subsurface flow in the region.  相似文献   

Potential Heavy Metals Accumulation of Indigenous Plant Species along the Mafic and Ultramafic Terrain in the Mohmand Agency,Pakistan          下载免费PDF全文

Mohammad T. Shah  Jamila Ara  Said Muhammad  Sardar Khan  Saeed A. Asad  Liaqat Ali 《洁净——土壤、空气、水》2014,42(3):339-346

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Removal of Cd and Pb in Calcareous Soils by Using Na2EDTA Recycling Washing          下载免费PDF全文

Shujuan Zhang  Zhihui Yang  Baolin Wu  Yangyang Wang  Ruiping Wu  Yingping Liao 《洁净——土壤、空气、水》2014,42(5):641-647

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Seasonal Dynamics of Rhizosphere Soil Microbial Abundances and Enzyme Activities under Different Vegetation Types in the Coastal Zone,Shandong, China          下载免费PDF全文

Gang Xu  Peng Chen  Jun‐Na Sun  Hong‐Bo Shao 《洁净——土壤、空气、水》2014,42(8):1115-1120

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Electrokinetic Remediation of Fluorine‐Contaminated Soil Using Approaching Cathodes          下载免费PDF全文

Ming Zhou  Shufa Zhu  Yana Liu  Hui Wang 《洁净——土壤、空气、水》2014,42(12):1771-1775

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Immobilisation of Pb and Zn in Soils Using Stabilised Zero‐valent Iron Nanoparticles: Effects on Soil Properties          下载免费PDF全文

María Mar Gil‐Díaz  Araceli Pérez‐Sanz  María Ángeles Vicente  María Carmen Lobo 《洁净——土壤、空气、水》2014,42(12):1776-1784

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Discrimination of Soils and Assessment of Soil Fertility Using Information from an Ion Selective Electrodes Array and Artificial Neural Networks          下载免费PDF全文

Aitor Mimendia  Juan M. Gutiérrez  Josep M. Alcañiz  Manel del Valle 《洁净——土壤、空气、水》2014,42(12):1808-1815

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Changes in Enzyme Activities and Microbial Community Structure in Heavy Metal‐Contaminated Soil under in Situ Aided Phytostabilization          下载免费PDF全文

Daniel Wasilkowski  Agnieszka Mrozik  Zofia Piotrowska‐Seget  Jacek Krzyżak  Marta Pogrzeba  Grażyna Płaza 《洁净——土壤、空气、水》2014,42(11):1618-1625

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Application of Endophytic Bacteria to Reduce Persistent Organic Pollutants Contamination in Plants          下载免费PDF全文

Xuezhu Zhu  Xue Ni  Juan Liu  Yanzheng Gao 《洁净——土壤、空气、水》2014,42(3):306-310

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