scholarly journals Modelling Sediment Retention Services and Soil Erosion Changes in Portugal: A Spatio-Temporal Approach

2021 ◽  
Vol 10 (4) ◽  
pp. 262
Author(s):  
Susana M. Marques ◽  
Felipe S. Campos ◽  
João David ◽  
Pedro Cabral
Keyword(s):  
Soil Erosion ◽  
Water Conservation ◽  
National Level ◽  
Well Being ◽  
Environmental Conservation ◽  
Delivery Ratio ◽  
Sediment Retention ◽  
Erosion Processes ◽  
Spatio Temporal ◽  
Sdr Model

Soils provide important regulating ecosystem services and have crucial implications for human well-being and environmental conservation. However, soil degradation and particularly soil erosion jeopardize the maintenance and existence of these services. This study explores the spatio–temporal relationships of soil erosion to understand the distribution patterns of sediment retention services in mainland Portugal. Based on Corine Land Cover maps from 1990 to 2018, the InVEST Sediment Delivery Ratio (SDR) model was used to evaluate the influence of sediment dynamics for soil and water conservation. Spatial differences in the sediment retention levels were observed within the NUTS III boundaries, showing which areas are more vulnerable to soil erosion processes. Results indicated that the Region of Leiria, Douro and the coastal regions have decreased importantly in sediment retention capacity over the years. However, in most of the territory (77.52%), changes in sediment retention were little or were not important (i.e., less than 5%). The statistical validation of the model proved the consistency of the results, demonstrating that the InVEST SDR model is an appropriate tool for estimating soil loss potential by water at regional/national levels, although having its limitations. These findings can be relevant to support strategies for more efficient land-use planning regarding soil erosion mitigation practices and to stimulate further investigation at a national level on this important ecosystem service.

scholarly journals Modelling Sediment Retention Services and Soil Erosion Changes in Portugal: A Spatio-Temporal Approach

2021 ◽  
Author(s):  
Susana M. Marques ◽  
Felipe S. Campos ◽  
João David ◽  
Pedro Cabral
Keyword(s):  
Soil Erosion ◽  
Land Use Planning ◽  
Water Conservation ◽  
Well Being ◽  
Environmental Conservation ◽  
Delivery Ratio ◽  
Sediment Retention ◽  
Retention Capacity ◽  
Erosion Processes ◽  
Spatio Temporal

Soils provide important regulating ecosystem services and have crucial implications for human well-being and environmental conservation. However, soil degradation and particularly soil erosion jeopardize the maintenance and existence of these services. This study explores the spatio-temporal relationships of soil erosion to understand the distribution patterns of sediment retention services in mainland Portugal. Based on Corine Land Cover maps from 1990 to 2018, the InVEST Sediment Delivery Ratio (SDR) model was used to evaluate the influence of sediment dynamics for soil and water conservation. Spatial differences in the sediment retention levels were observed within the NUTS III boundaries, showing which areas are more vulnerable to soil erosion processes. Results indicated that the Region of Leiria, Douro and the coastal regions have decreased importantly sediment retention capacity over the years. However, in most of the territory (77.52%) changes in sediment retention were little or not important (i.e., less than 5%). The statistical validation of the model proved the consistency of the results, highlighting the usefulness of this methodology to analyse the state of soil erosion in the country. These findings can be relevant to support strategies for more efficient land use planning regarding soil erosion mitigation practices.

scholarly journals Impact of Wheat Residue on Soil Erosion Processes

2018 ◽  
Vol 46 (2) ◽  
pp. 553-562 ◽  
Author(s):  
Ataollah KAVIAN ◽  
Leila GHOLAMI ◽  
Maziar MOHAMMADI ◽  
Velibor SPALEVIC ◽  
Moghadeseh FALAH SORAKI
Keyword(s):  
Soil Erosion ◽  
Water Conservation ◽  
Soil Conservation ◽  
Rainfall Intensity ◽  
Sandy Loam ◽  
Sediment Concentration ◽  
Runoff Coefficient ◽  
Northern Iran ◽  
Erosion Processes ◽  
Loam Soil

Soil erosion is one of the key challenges in soil and water conservation. Vegetation that covers soil and organic and inorganic mulch is very useful for the control of erosion processes. This study examined treatment with wheat residual (as agriculture mulch) on infiltration, time to runoff, runoff coefficient, sediment concentration and soil erosion processes. The study has been conducted for sandy-loam soil taken from summer rangeland (Northern Iran) with simulated rainfall intensities of 50 and 100 mm h-1. The experiment was conducted in slopes of 30% in three replications with two amounts of wheat residual of 50 and 90 %. The results showed that conservation percent of soil erosion for wheat residual 50 and 90% was 61.68 and 73.25%, respectively (in rainfall intensity of 50 mm h-1). Also, the conservation percent of soil erosion for wheat residual of 50 and 90% cover was 70.68 and 90.55, respectively (in rainfall intensity of 100 mm h-1). It was concluded that the conservation treatments could reduce runoff coefficient, sediment concentration and soil erosion and increase the time to runoff and infiltration coefficient. This effect was significant on time for infiltration, sediment concentration and soil erosion variables (R2=0.99), time to runoff and runoff coefficient variables (R2=0.95). The interaction effects of rainfall intensity and soil conservation was significant for sediment concentration and soil erosion variables (R2=0.99).

scholarly journals Functional Diversity Effects of Vegetation on Runoff to Design Herbaceous Hedges for Sediment Retention

Diversity ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 131
Author(s):  
Léa Kervroëdan ◽  
Romain Armand ◽  
Mathieu Saunier ◽  
Michel-Pierre Faucon
Keyword(s):  
Soil Erosion ◽  
Plant Species ◽  
Functional Diversity ◽  
Species Interactions ◽  
Agricultural Landscapes ◽  
Stem Density ◽  
Herbaceous Plant ◽  
Sediment Retention ◽  
Erosion Processes ◽  
Diversity Effects

Background: Functional diversity effects on ecosystem processes, like on soil erosion, are not fully understood. Runoff and soil erosion in agricultural landscapes are reduced by the hydraulic roughness (HR) of vegetation patches, which furthers sediment retention. Vegetation with important stem density, diameters, leaf areas, and density impact the HR. A functional structure composed of these negatively correlated traits involved in the increase of the HR would constitute a positive effect of the functional diversity. Methods: Runoff simulations were undertaken on four mono-specific and two multi-specific communities, using herbaceous plant species from North-West Europe, presenting six contrasting aboveground functional traits involved in the HR increase. Results: An effect of dominant traits in the community was found on the HR, identified as the community-weighted leaf density. The non-additive effect of functional diversity on the HR could be explained by the presence of species presenting large stems in the communities with high functional diversity. Conclusion: We argued that functional diversity effect on the HR could change due to idiosyncratic effects of the plant traits, which would be influenced by soil properties, phylogeny diversity, and plant species interactions. These findings constitute an advancement in the understanding of plant trait assemblage on runoff and soil erosion processes.

scholarly journals Effects of vegetation cover and slope on soil erosion in the Eastern Chinese Loess Plateau under different rainfall regimes

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11226
Author(s):  
Congjian Sun ◽  
Huixin Hou ◽  
Wei Chen
Keyword(s):  
Soil Erosion ◽  
Loess Plateau ◽  
Water Conservation ◽  
Vegetation Cover ◽  
Interactive Effects ◽  
Chinese Loess Plateau ◽  
Slope Gradient ◽  
Chinese Loess ◽  
Sediment Yields ◽  
Erosion Processes

Soil erosion is a critical environmental problem of the Chinese Loess Plateau (CLP). The effects of vegetation cover on soil erosion reduction under different rainfall types are not well understood especially in the eastern Chinese Loess Plateau (ECLP). In this study, we monitored runoff and sediment yield at the Fengjiagou water and soil conservation station with five types of vegetation cover (arbor trees (ARC), shrubs (SHC), arable (ABC), natural vegetation (NVC), and artificial grass (APC)) and three slope gradients (10°, 15°, and 20°) in the ECLP. Based on long-term monitoring data, five rainfall types were classified by the maximum 30 min rainfall intensity (I30). We also quantitatively revealed the interactive effects of different types precipitation, vegetation cover and slope gradients on regional soil erosion. The results showed that (1) The RII (13 times) and RIII (eight times) type are the most threatening erosive rainfall in this region. (2) The ARC and SHC type were most beneficial for soil and water conservation in the ECLP; The APC and ABC are not conductive to the prevention of regional soil erosion. (3) Runoff and sediment yields increased with the slope gradient. The farmland is vulnerable to soil erosion when the slope gradient exceeds 10°. The results of this study can improve the understanding of regional soil erosion processes on the ECLP and provide useful information for managing regional water and land resources.

Quantification and Evaluation of Water Erosion

2020 ◽  
pp. 140-161
Author(s):  
Souad Ben Salem ◽  
Abdelkrim Ben Salem ◽  
Ahmed Karmaoui ◽  
Mohammed Khebiza Yacoubi ◽  
Mohammed Messouli
Keyword(s):  
Erosion Rate ◽  
Water Erosion ◽  
Delivery Ratio ◽  
Arid Zones ◽  
Human Intervention ◽  
Sedimentation Analysis ◽  
Sediment Retention ◽  
Sediment Delivery ◽  
Eastern Morocco ◽  
Sdr Model

The Ziz Watershed is located in the arid zones of South-Eastern Morocco and belongs to the large basin of Ziz-Rheris. In this basin, floods are related to natural factors and mainly to the occupation of the hydraulic public domain and the human intervention on the courses of the rivers. Increases in sediment yield are observed in many places in the Ziz, dramatically affecting water quality and reservoir management. In order to map overland sediment generation and delivery to the stream (studying the service of sediment retention), the InVEST sediment delivery ratio (SDR) model was applied. The sedimentation analysis in the Hassan Dakhil Dam, located in this watershed, shows that there is a very important erosion rate. The proof is the rapid filling of the dam. This is due to the transport of sediments in the rivers. If this situation continues at the current rate, the dam will no longer be fully operational for irrigation by 2050.

scholarly journals Assessment of Residents' Understanding of Potential Ecosystem Services of Phewa Watershed

2020 ◽  
Vol 2 (1) ◽  
pp. 61-78
Author(s):  
Shivaraj Thapa ◽  
Subina Shrestha ◽  
Suman Bhattarai ◽  
Mahamad Sayab Miya ◽  
Deepak Gautam
Keyword(s):  
Ecosystem Services ◽  
Ecosystem Service ◽  
Service Providers ◽  
National Level ◽  
Well Being ◽  
Economic Benefits ◽  
Management Tool ◽  
Payment For Ecosystem Services ◽  
Sediment Retention ◽  
Community Forests

Phewa watershed, the second largest natural lake system in Nepal, is considered vital for the well being and economy at local, provincial and national level. Phewa watershed offers multiple benefits to the downstream dwellers involved in tourism, hotel, boating, fishing, irrigation, hydropower, etc. The constant degradation of watershed has become a serious challenge to sustain the watershed. Payment for Ecosystem Services (PES) can be an effective environmental management tool for sustaining ecological and economic benefits, especially in an urban watershed like Phewa. This study has assessed the opportunities for the potentialityof PES in Phewa watershed. It first identified and ranked the tradable ecosystem services along with service providers and beneficiaries using Likert scale. Then, 137 households were surveyed to evaluate their perceptions of payment for ecosystem services and sustainable management of Phewa Lake. The results identified tourism as the major ecosystem service in the watershed followed by biodiversity and sediment retention to control flooding and erosion. Protected and community forests users groups within the watershed area, landowners, and farmers were identified as upstream users or service providers whereas the business owners like boat agencies, hotels and restaurants, drinking water users, and Nepal electricity authority were identifiedas the service beneficiaries of the identified ecosystem service. The challenges associated with implementing PES scheme were the lack of financial resource, lack of institutional organization and marketing for ecosystem services, population growth, lack of coordination between stakeholders, and lack of public participation. Thus, this study showed that education-based activities should be organized to enhance participation of beneficiaries and upstream dwellers. Also, PES policy mechanism with clear guidelines should be formulated for assuring the participation of the community people forthe implementation of PES.

scholarly journals Spatio-Temporal Variation of Ecosystem Services and Its Trade-off Relationships in Southwest Guangxi

2021 ◽  
Author(s):  
Yichao Tian ◽  
Yongwei Yang
Keyword(s):  
Ecosystem Services ◽  
Water Conservation ◽  
Soil Conservation ◽  
Well Being ◽  
Mutual Relationship ◽  
Invest Model ◽  
The Past ◽  
Trade Offs ◽  
Integrated Valuation ◽  
Spatio Temporal

Identifying the mutual relationship between ecosystem services in southwest Guangxi can jointly optimize a variety of services to avoid damaging others while improving one service, which is of great significance for promoting the sustainable management of regional ecosystem, guiding the rational development of natural resources and improving human well-being. Based on remote sensing data, land use data, meteorological data and DEM data, with the support of Carnegie-Ames-Stanford Approach (CASA) model, Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) model and Revised Universal Soil Loss Equation (RUSLE) model, this paper studies the changing characteristics of typical ecosystem services in southwest Guangxi and explores the mutual relationship between different ecosystem services. The results showed that the mean change trend of the whole vegetation net primary productivity (NPP) has been increasing in the study area over the past 19 years. In the past 19 years, water conservation in southwest Guangxi has shown a fluctuating upward trend, with the growth rate of water conservation quality 255.88 mm/hm−2·a−1. During the study period, the range of soil retention variation to the total of 65.38–96.88 t/hm−2·a−1 increased 22.73 t/hm−2·a−1, with a mean of 79.19 t/hm−2·a−1. Vegetation NPP in the study area is synergistic with soil conservation and water conservation, and soil conservation with water conservation as well.

scholarly journals CliFEM – Climate Forcing and Erosion Modelling in the Sele River Basin (Southern Italy)

2009 ◽  
Vol 9 (5) ◽  
pp. 1693-1702 ◽  
Author(s):  
N. Diodato ◽  
M. Fagnano ◽  
I. Alberico
Keyword(s):  
Soil Erosion ◽  
River Basin ◽  
Climate Forcing ◽  
Soil Tillage ◽  
Delivery Ratio ◽  
Scale Invariant ◽  
Sediment Delivery ◽  
Erosion Processes ◽  
Erosion Modelling ◽  
Soil Losses

Abstract. This study presents a revised and scale-adapted Foster-Meyer-Onstad model (Foster et al., 1977) for the transport of soil erosion sediments under scarce input data, with the acronym CliFEM (Climate Forcing and Erosion Modelling). This new idea was addressed to develop a monthly time scale invariant Net Erosion model (NER), with the aim to consider the different erosion processes operating at different time scales in the Sele River Basin (South Italy), during 1973–2007 period. The sediment delivery ratio approach was applied to obtain an indirect estimate of the gross erosion too. The examined period was affected by a changeable weather regime, where extreme events may have contributed to exacerbate soil losses, although only the 19% of eroded sediment was delivered at outlet of the basin. The long-term average soil erosion was very high (73 Mg ha−1 per year ± 58 Mg ha−1). The estimate of monthly erosion showed catastrophic soil losses during the soil tillage season (August–October), with consequent land degradation of the hilly areas of the Sele River Basin.

scholarly journals Evaluating soil erosion and sediment deposition rates by the <sup>137</sup>Cs fingerprinting technique at karst gabin basin in Yunnan Province, southwest China

2020 ◽  
Author(s):  
Yanqing Li ◽  
Zhongcheng Jiang ◽  
Zhihua Chen ◽  
Yang Yu ◽  
Funing Lan ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Water Conservation ◽  
Yunnan Province ◽  
Southwest China ◽  
Soil Depth ◽  
Principal Component ◽  
Delivery Ratio ◽  
Sediment Delivery ◽  
Deposition Rates ◽  
Soil Sediment

Abstract. Soil erosion is a global environmental problem that can lead to the loss of nutrients in topsoil layers, particularly in fragile karst environments where the low contents of organic carbon and steep slopes used to be key pedological and geomorphological factors. Researching the erosion and deposition rates in small watersheds is important for designing efficient soil and water conservation measures. In this research, the Dapotou closed catchment, a representative depression in karst gabin basin, located in the Yunnan province, Southwest China, was selected to assess the variation of soil erosion and soil sediment mobilisation at different hillslope positions using the 137Cs tracing technique. The results showed that the soil erosion rates in the shoulders, backslopes and footslopes were 0.87, 0.35 and 0.49 cm a−1, respectively, meanwhile the soil sediment rate in depression bottom was 2.65 cm a−1. The average annual soil erosion modulus of the complete hillslope was 632 t km−2 a−1, which confirmed in the serious gradation according to karst soil erosion standards. The soil deposition modulus reached up to 3180 t km−2 a−1. The sediment delivery ratio summarized 0.82 in the whole catchment according to the square of hillslope and depression bottom. To identify which factor could play the most important role, a Principal Component Analysis was conducted. The results showed 137Cs concentration of different soil depth at different hillslope positions were significant correlated with soil organic matter (SOM) and total nitrogen (TN) (P 

scholarly journals The Impact of Land Use Changes on Soil Erosion in the River Basin of Miocki Potok, Montenegro

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2973
Author(s):  
Velibor Spalevic ◽  
Goran Barovic ◽  
Dusko Vujacic ◽  
Milic Curovic ◽  
Morteza Behzadfar ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
River Basin ◽  
Land Use Changes ◽  
National Level ◽  
River Basins ◽  
The Other ◽  
Erosion Processes ◽  
The Impact ◽  
Erosion Intensity

Land use change in all river basins leads to changes in hydrologic response, soil erosion, and sediment dynamics characteristics. Those changes are often viewed as the main cause of accelerated erosion rates. We studied the impact of land use changes on soil erosion processes in one of the watersheds in Montenegro: the Miocki Potok, using this watershed as a pilot river basin for this area. We simulated responses of soil erosion processes by using a process-oriented soil erosion Intensity of Erosion and Outflow (IntErO) model, with different settings of land use for the years 1970, 1980, 1990, 2000, 2010, and 2020. The model provides fast, effective, and affordable insight into the effects of land use change on soil erosion processes. Testing of the applied procedures was important for the further establishment of watershed management methodologies at the national level, for the other 300 river basins of Montenegro. For the current state of land use, calculated peak discharge for the Miocki Potok was 364 m3 s−1 (2020)–372 m3 s−1 (1970) for the incidence of 100 years, and there is a possibility for large flood waves to appear in the studied basin. Real soil losses, Gyear, were calculated at 13680 m3 year−1 (2020) and specific 333 m3 km−2 year−1 (2020). A Z coefficient value of 0.439 (2020) indicated that the river basin belongs to destruction category III. The strength of the erosion process was medium, and according to the erosion type, it was mixed erosion. According to our analysis, the land use changes in the last 50 years influenced a decrease in the soil erosion intensity for 14% in the Miocki Potok River Basin. Further studies should be focused on the detailed analysis of the land use changes trends with the other river basins at the national level, closely following responses of soil erosion to the changed land use structure, and effects of plant-and-soil interaction on soil erosion and sediment dynamics.

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