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Introduction
Skills and Expertise
Publications
Publications (189)
Raindrops impact can affect the flow resistance to sheet flow by interfering with flow velocity profile. However, quantitative information regarding the flow resistance induced by raindrops impact to sheet flow (Δf) under the influence of different surface roughnesses is limited. In this study, multiple experimental simulations of rainfall and infl...
Purpose
Soil erosion and sediment transport are often induced by a few extreme precipitation events. Currently, there is limited information on the effects of changes in precipitation extremes on river sediment load over a long time period at the basin scale. The objectives of this study were to quantify the effects of variations in precipitation e...
Understanding the responses of soil enzyme activities to elevated CO2 concentration and warming can provide a scientific basis for nutrient management of croplands under global climate change. We conducted a pot expe-riment with climate chamber to examine the effects of elevated CO2 concentration and warming and winter wheat growth on soil enzyme a...
Understanding hillslope erosion processes is important for the development of physically-based erosion prediction models. However, quantitative information about the successive development of interrill–rill–ephemeral gully erosion on hillslopes is still rare. In this study, rare earth elements (REEs) were employed as tracers to monitor the successi...
Soil internal forces can affect aggregate breakdown, and then impact splash detachment and transport of aggregate fragments. However, currently, the processes of soil splash detachment and transport under different soil internal forces are still not fully understood. Thus, to determine the effects of soil internal forces on the splash transport pro...
Revealing the responses of soil microbial community to soil erosion can provide guidance for agricultural ecosystem management. We investigated the impacts of soil erosion intensity on soil microbial quantity at the Binzhou River Basin, a typical thin layer Mollisol area in Bin County of Heilongjiang Province, using 137Cs tracer. The results showed...
Ephemeral gully (EG) is an important linear erosion feature, often occurring at mid-slope position, that can be greatly influenced by upslope inflow and its sediment transport capacity. How sediment concentration in upslope inflow influences downslope EG erosion is still unclear. Thus, field monitoring on a natural hillslope and indoor simulations...
Because soil erosion is a primary cause of land degradation globally, it has received increasing attention in food production regions, such as the Chernozem region of Northeast China. This study assessed soil quality under soil erosion degradation using a novel optimal data set (ODS) approach and a comparative minimum data set (MDS) approach to der...
Soil interparticle forces can pose important effects on soil aggregate stability and rainfall splash erosion. Meanwhile, these interparticle forces are strongly influenced by specific ion effects. In this study, we applied three monovalent cations (Li⁺, Na⁺, and K⁺) with various concentrations to investigate the influence of specific ion effects on...
China is one of the countries with severest soil erosion in the world due to special features of soil erosion environment background with complex geological structure, diverse geomorphologic types, multiple extreme climates, thousands of years’ cultivation history and dense population distribution.
Snowmelt erosion is an important way of soil loss in Chinese Mollisol region. However, little is known about the effects of seepage flow and soil thaw depth on hillslope snowmelt runoff erosion. An indoor simulated experiment was conducted to analyze the impacts of seepage flow and soil thaw depth on hillslope snowmelt erosion. There were two snowm...
Overland flow in an ephemeral gully (EG) system includes the EG channel, rill and interrill sheet flows, which comprise an interconnected drainage network. There are abundant researches on the hydraulics of rill flow and interrill sheet flow, as well as their relationships with soil detachment rates and sediment loads. Few studies have quantified t...
Although concern for ephemeral gully (EG) erosion has been growing within the research community, knowledge gaps still need to be identified for a state-of-the-art review. This review is based on an extensive search of published literature in the Web of Science database that specifically addressed EG erosion. This review included 173 papers publish...
Given that soil erosion is a primary cause of land degradation globally, it has been receiving increasing attention in food production regions, such as the Mollisol region in northeastern China. This study assessed soil quality under soil erosion degradation using a novel optimal data set (ODS) approach and a comparative minimum data set (MDS) appr...
Understanding seasonal soil erosion and deposition rates and their spatial distribution along sloping farmlands are necessary for erosion prediction technology and implementing effective soil conservation practices. To date seasonal change of soil erosion and soil redistribution on long gentle hillslopes are not fully quantified due to the variable...
Ecological stoichiometry can reveal nutrient cycles in soil and plant ecosystems and their interactions. However, the ecological stoichiometry characteristics of leaf-litter-soil system of dominant grasses, shrubs and trees are still unclear as are their intrinsic relationship during vegetation restoration. This study selected three dominant plant...
Freeze-thaw action is a common natural phenomenon in cold regions, which affects soil erodibility by changing soil structure and mechanical properties. However, quantifying the impacts of freeze-thaw cycles (FTCs) at different initial soil water contents (ISWCs) on soil erodibility is challenging due to the complex interactive soil mechanical respo...
Detachment and transport processes of interrill soil erosion are not yet fully understood and quantified due to their complexity. Understanding these processes and their interaction is essential to developing effective interrill erosion prediction models. Thus, the objectives are to (1) identify detachment-limiting and transport-limiting regimes by...
Quantifying rill bed incision provides fundamental information for process-based erosion modeling; while the morphodynamic and hydrodynamic mechanism in bed incision processes are still unclear. Thus, experiments were conducted to examine rill bed incision processes in upland concentrated flows. DEMs (2 mm × 2 mm resolution) obtained by photogramme...
Rill network development not only potentially affects hillslope and drainage network evolution, but also causes severe soil degradation. However, the studies on rill network development remain inconclusive. This study aimed to investigate the temporal and spatial development of hillslope rill networks and their characteristics based on rainfall sim...
Rainfall and snowfall differ greatly in terms of their effects on hydrological processes. Snowfall is usually regarded as snow water equivalent in studying precipitation extremes, without considering the difference between snowfall and rainfall. Although snowfall is a key indicator of global change, no generally accepted and no unified indices for...
Long-term natural vegetation succession plays a substantial role in the accumulation and distribution of plant and soil C:N:P stoichiometry. However, how plant and soil C:N:P relationships or ratios change along with successional stages over a century in the severely eroded areas remain unclear. These were measured over a 100-year natural successio...
The Water Erosion Prediction Project (WEPP) model has been extensively evaluated at lower slope gradients, but its applicability to steep slopes is not yet known. The objectives of this study were to evaluate the WEPP model’s ability to predict runoff and soil erosion on steep slopes in the hilly-gully region of the Loess Plateau of China, and to p...
Headcut formation and migration was sometimes mistaken as the result of overland flow without realizing that the headcut was formed by and being influenced by flow through soil pipes into the headcut. To determine the effects of the soil pipe and flow through a soil pipe on headcut migration in loessic soils, laboratory experiments were conducted u...
Rill development is a major soil erosion process that causes severe soil degradation. This study examined the effects of representative rainfall intensities (50 and 75 mm h−1), slope gradients (10° and 15°), and slope lengths (7.5 and 10.0 m) on rill development and rill characteristics on loessial hillslopes in China. Loessial soil was collected f...
Overland flow through an ephemeral gully (EG) system integrates flow from upslope areas and lateral side slopes. Lateral overland inflow creates tributaries to the main EG channel for runoff and sediment discharge which exacerbates the EG erosion and local soil degradation. However, research concerning tributary formation by overland flow, especial...
Raindrop impact (RI) and groundwater seepage (GWS) play important roles in slope erosion processes. However, reliable quantification of their interactive effects on erosion is still lacking. Therefore, a laboratory study was conducted to reveal the effects of RI and GWS on hillslope erosion. A soil box (5.0 m long, 0.5 m wide, and 0.5 m deep) was s...
Sediment discharge Accurate soil erosion monitoring provides a basis for soil erosion prediction and prevention. Channel bank erosion quantification is prerequisite to couple effectively the bank sediment supply system with fluvial sediment transport fluxes. The objectives of this study were to describe and evaluate methods for monitoring and data...
Purpose
Characterizations of soil aggregates and soil organic carbon (SOC) losses affected by different water erosion patterns at the hillslope scale are poorly understood. Therefore, the objective of this study was to quantify how sheet and rill erosion affect soil aggregates and soil organic carbon losses for a Mollisol hillslope in Northeast Chi...
Many erosion control techniques, such as stone pitching, concrete revetment, and geotextile covering, have been effective at protecting cut slopes along roads or railways. However, these methods are expensive and hard to operate for high stairstep cut-slopes. To investigate the efficiency of several easily implemented and low-cost techniques, five...
Ridge tillage is the most common tillage method in Mollisol region of Northeast China, and contour ridge tillage is one of the practices to promote soil and water conservation on the farmland. However, the effects of contour ridge tillage for controlling hillslope soil erosion and its erosion process under different rainfall intensities have not be...
The need to estimate event soil loss better than the USLE and the RUSLE has led to the development of WEPP and the USLE-M, a modification of the USLE that estimates event soil loss for bare fallow runoff and soil loss plots in the USLE database better than the USLE/RUSLE when runoff is known or predicted well. Although the erosivity indicies in the...
Tracking sediment source and movement is essential to fully understanding soil erosion processes. The objectives of this study were to identify dominant erosion process and to characterize the effects of upslope interrill erosion on downslope interrill and rill erosion in a preformed interrill-rill system. A coarse textured soil with 2% clay and 20...
Quantifying rill bed incision provides fundamental information for process-based erosion modeling; while the morphodynamic and hydrodynamic mechanism in bed incision processes are still unclear. Thus, experiments were conducted to examine rill bed incision processes in upland concentrated flows. DEMs (2 mm × 2 mm resolution) obtained by photogramme...
Purpose
Rills are basic pathways for runoff, sediment, and pollutant transport at hillslopes within agricultural watershed. The objectives of this study were to investigate the development processes of rill network and morphological characteristics and to examine their affecting factors.
Materials and methods
A soil box (10 m long, 1.5 m wide, and...
Longitudinal ridge tillage is the conventional tillage method in the cold, Mollisol region of Northeast China in which furrows are oriented up and down the slope. In part due to the use of this tillage system with large slope lengths, soil erosion is a serious problem in this region. Currently, it is unclear what the best tillage system and ridge o...
Topsoil loss and overloaded sediment deposition profoundly influence soil productivity. Understanding the changes in crop yield with the decrease of topsoil thickness and the increase of sediment deposition depth is crucial to elucidate the effects of soil erosion and deposition on soil productivity. However, little information is available concern...
Chao Qin C. He Fenli Zheng- [...]
C. Zeng
Headcut erosion constitutes more than 60% of hillslope soil loss. Quantitative research on rill headcut erosion processes provides fundamental information for process-based erosion modeling. Due to the complicated headcut morphologies and flow regimes near a headcut, it is hard to accurately predict the erosion rate of a headcut in some soil erosio...
Different precipitation phases (rain, snow or sleet) differ greatly in their hydrological and erosional processes. Therefore, accurate discrimination of the precipitation phase is highly important when researching hydrologic processes and climate change at high latitudes and mountainous regions. The objective of this study was to identify suitable...
The information of aggregate disintegration mechanisms during splash erosion is scant. This study was conducted to quantify contributions of the mechanisms of aggregate disintegration to splash erosion. Six soils with five soil textures were used. Soil aggregate stability was determined by the Le Bissonnais (LB) method. Deionized water was used to...
Gully morphology characteristics can be well used effectively to describe the status of gully development. The Chabagou watershed, located in the hilly-gully region of the Loess Plateau in China, was selected to investigate gully morphological characteristics using 3D laser scanning technique (LIDAR). Thirty-one representative gullies located at di...
Gully erosion contributes large amounts of sediment within watersheds around the world. Gully widening constitutes about 80% of total soil loss, especially in the presence of a plow pan which manifests a less or non-erodible soil layer. Current knowledge on sidewall toe scour (scour arcs) and tension crack processes in gully widening is limited. Th...
Core Ideas
Rare‐earth element oxide tracers are preferably bound to silt and clay particles.
Rare‐earth element tracers are conservative during erosion and transport in each size class.
A simple correction factor reduced erosion estimation error to greater than 4.5%.
The correction method does not require rare‐earth element measurement in different...
Upslope runoff has a great influence on hillslope soil erosion in typical black soil regions. However, few attempts have been made to clearly distinguish the effects of rainfall and upslope runoff on the hillslope soil erosion. Therefore, quantifying the contributions of rainfall and upslope runoff to the hillslope soil erosion is important, which...
Ephemeral gullies (EGs) are major contributors to sediment loss and land degradation on cultivated lands. However, the topography and rainfall impacts on EG development processes are still unclear, especially on steep loessial hillslopes like the Loess Plateau. A series of laboratory rainfall simulation experiments were conducted to investigate the...
The contributions of different mechanisms of aggregate breakdown to splash erosion are still obscure. This study was designed to investigate the effects of various mechanisms of soil disaggregation on splash erosion. Loamy clay, clay loam and sandy loam soil types were used in this research. Soil aggregate stability was determined by the Le Bissonn...
Understanding changes in Holocene erosion is essential for predicting soil erosion in the future. However, the quantitative response of natural erosion to Holocene climate change is limited for the Loess Plateau of China. In this study, two soil profiles were investigated on the Luochuan and Yanchang sites in the central Loess Plateau of China; and...
Abstract: Study on the effects of extreme precipitation events on runoff and sediment load not only can reveal the mechanism of runoff and sediment, but also provide important scientific support for basin disaster warning. Currently, there is limited information on the effects of extremes precipitation events on river sediment load. Thus, this stud...
A soil aggregate represents a key soil structural unit that influences several physical soil properties such as water infiltration, runoff and erosion. The relationships between soil aggregate stability and interrill and rill erodibility are critical to process-based erosion prediction models yet remain unclear, likely due to the difficulty of dist...
Previous research on sediment transport capacity has been inadequate and incomplete in describing the detachment and transport process of concentrated flows on slope farmlands during rill development. An indoor concentrated flow scouring experiment was carried out on steep loessial soil slope with erodible bed to investigate the sediment transport...
The impact of rainfall patterns on the interrill erosion process is not fully understood despite its importance. Systematic rainfall simulation experiments involving various rainfall intensities, stages, intensity sequences, and surface cover conditions were conducted in this study to investigate their effects on interrill erosion process. Five rai...
Understanding dynamic changes in climate extremes is important in forecasting extreme climate events and reducing their associated impacts. The objectives of this study were to analyze the spatiotemporal variations in temperature extremes and their association with atmospheric circulation, based on daily maximum (TX) and minimum temperatures (TN) c...
Accurate measurements of rill geometry and flow parameters provide theoretical basis for erosion processes on hillslopes. Rill width and depth are basic rill morphological characteristics. Rill flow width and depth are the foundation for calculating hydraulic and hydrodynamic parameters. A soil box (2.0 m long, 0.3 m wide and 0.5 m deep) was subjec...
【Objective】Modifying soil physical properties is an important approach to improving soil anti-erodibility. As by-product of some industries, corn stalk sap is often discharged as waste. Recent studies have demonstrated that spraying corn stalk sap in the field may control sheet erosion. However, little is available in literature regarding effects o...
Understanding the relationship between hillslope soil loss with ephemeral gully and rainfall regime is important for soil loss prediction and erosion control. Based on 12-year field observation data, this paper quantified the rainfall regime impacts on soil loss at loessial hillslope with ephemeral gully. According to three rainfall parameters incl...
Understanding changes in Holocene erosion is essential for predicting soil erosion in the future. However, the quantitative response of natural erosion to Holocene climate change is limited for the Loess Plateau of China. In this study, two soil profiles were investigated in Luochuan and Yanchang sites on the central Loess Plateau of China, and fou...
Core Ideas
Directional components of splash erosion and effects of raindrop kinetic energy were investigated.
Lateral splash erosion played a significant role in supplying detached particles to adjacent areas.
We fit equations for total and net splash erosion to rainfall physical parameters.
We used cross‐validation to test the equations.
Splash e...
Soil erodibility (K-factor) is an essential factor in soil erosion prediction and conservation practises. The major obstacles to any accurate, large-scale soil erodibility estimation are the lack of necessary data on soil characteristics and the misuse of variable K-factor calculators. In this study, we assessed the performance of available erodibi...
Accurate measurements of rill geometry and flow parameters provide theoretical basis for erosion processes on hillslopes. Rill width and depth are basic rill morphological characteristics. Rill flow width and depth are the foundation for calculating hydraulic and hydrodynamic parameters. A soil box (2.0 m long, 0.3 m wide and 0.5 m deep) was subjec...
Rill erosion rate and hydrodynamics parameters present evident spatial and temporal variation characteristics during rill development process on hillslopes. Based on 3-D laser scanning technique (LIDAR) and intermittent simulated rainfall experiments, high-precision DEMs were extracted. Temporal and spatial variations of rill erosion and hydrodynam...
Soil aggregates profoundly influence soil fertility and soil erosion. A large number of studies have showed that soil aggregate loss was mainly affected by raindrop impact and runoff detachment during hillslope erosion process; however, few attempts have been made to investigate which one plays the dominant role in soil aggregate loss. Therefore, a...