An assessment of erosivity distribution and its influence on the effectiveness of land use conversion for reducing soil erosion in Jiangxi, China

Xiao, Linlin; Yang, Xiaomei; Chen, Sixu; Cai, Hongyan

doi:10.1016/j.catena.2014.10.016

Cited by 53 publications

(32 citation statements)

References 50 publications

(48 reference statements)

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“…(13)) is widely used to determine the soil erodibility factor (Sun et al, 2014;Xiao et al, 2015). The physical properties of the soil (such as texture, thickness and organic matter content) were acquired from China's second soil survey data.…”

Section: Soil Erodibility Factor (K)mentioning

confidence: 99%

Changes and influencing factors of the sediment load in the Xiliugou basin of the upper Yellow River, China

Yao

Shi

Shao

et al. 2016

CATENA

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Based on the MK test and RUSLE model, changes in the soil erosion and sediment yield of the Xiliugou basin in the upper Yellow River during the period 1960-2013 were studied. The results indicate that hyperconcentrated floods are very typical in the Xiliugou basin. Hyperconcentrated floods occurred in 87.1% of the years during the period . Since the 2000s, the number of such floods was reduced considerably with the application of soil and water conservation, and only one hyperconcentrated flood was recorded from 2006 to 2013. Hyperconcentrated flows transfer most of the sediment yield in the Xiliugou basin. The sediment load carried by hyperconcentrated floods accounted for 84.7% of the total sediment yield in that basin during the period . Because hyperconcentrated flows may cause high and intensive erosion, the sediment eroded in gullies may be the main sediment source in the basin. Our results show that the percentages of gully erosion and slope erosion in this basin in the period 1964-1990 were 76.1% and 23.9%, respectively. A daily rainfall larger than 12 mm can cause hyperconcentrated flows, and the frequency of hyperconcentrated floods increases with the rainfall intensity. As a result of vegetation recovery and check-dam building, the frequency of hyperconcentrated flows and the annual sediment concentration and sediment yield for the same intensity of rainstorms were noticeably lower from 2006 to 2013 than those from 1964 to 1990. From 1960 to 2013, the annual sediment yield of the basin showed a significant downward trend, whereas no significant trend was detected in the annual precipitation. The annual sediment yield and precipitation from 1999 to 2013 decreased by 82.1% and 1.7%, respectively, compared with those in the period 1960-1998. The implementation of water and soil conservation measures and the reduced frequency of hyperconcentrated floods were the main reasons for the significant reduction in sediment yield in the period 2006-2013.

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Section: Soil Erodibility Factor (K)mentioning

confidence: 99%

Changes and influencing factors of the sediment load in the Xiliugou basin of the upper Yellow River, China

Yao

Shi

Shao

et al. 2016

CATENA

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“…The topography in the Poyang Lake basin varies from highly mountainous and hilly areas (with a maximum elevation of 2200 m above sea level) to alluvial plains in the lower reaches of the primary watercourses. The soils in the basin are mainly composed of red soil [59], which has a low infiltration rate of precipitation and is degraded and erosion-prone [60]. Thus, it is quite necessary to extend the previous studies at the local scale to provide a better understanding of variations in rainfall erosivity.…”

Section: Introductionmentioning

confidence: 99%

Variability of Rainfall Erosivity and Erosivity Density in the Ganjiang River Catchment, China: Characteristics and Influences of Climate Change

2018

Atmosphere

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Soil erosion is one of the most critical environmental hazards in the world. Understanding the changes in rainfall erosivity (RE) and erosivity density (ED), as well as their affecting factors, at local and catchment scales in the context of climate warming is an important prerequisite of soil erosion prevention and soil loss risk assessment. The present study identified the variability and trends of RE and ED in terms of both time and space in the Ganjiang River catchment over the period of 1960-2012, and also analyzed and discussed the impact of climate change. The results show that RE and ED in the catchment had great monthly variations and high year-to-year variability. Both presented long-term increasing trends over the entire study period. The highest RE and ED were observed in June and in the eastern and northeast parts of the catchment, which indicated that June was the most susceptible month for soil erosion in this area and the lower reaches of the Ganjiang River was the riskiest area for soil erosion. Finally, the East Asian summer monsoon and climate change were highly correlated with changes in RE and ED.

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“…We used rainfall erosivity to represent the ability of rainfall to cause soil erosion by considering the rainfall amount and intensity [32]. Based on the annual spatial data products of rainfall erosivity (1980-2014) developed by Xiao et al [33] using the daily precipitation dataset provided by the China Meteorological Data Sharing Service System (http://cdc.nmic.cn/home.do), we investigated the annual rainfall erosivity trends in the five watersheds (Ganjiang, Xiushui, Fuhe, Xinjiang and Raohe) during the 34 year period. As shown in Table 1, three time periods (1992-1994, 2004-2006, and 2011-2013) with similar mean annual rainfall erosivities (MAEs) were selected.…”

Section: Study Area Descriptionmentioning

confidence: 99%

Responses of Sediment Yield to Vegetation Cover Changes in the Poyang Lake Drainage Area, China

Xiao

Yang

Cai

2016

Water

Self Cite

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Abstract:Ascertaining the relationships between sediment transport processes and vegetation cover is essential for watershed soil and water conservation. However, it is not easy to realize this target on a large scale. In this study, the location-weighted landscape contrast index (LCI) based on the "source-sink" theory of ecological processes was introduced to unravel the response of sediment yield to vegetation cover changes in the Poyang Lake drainage area (the largest freshwater lake in China). A modified location-weighted landscape contrast index (mLCI) was proposed to improve the accuracy and efficiency of the LCI. The average vegetation fraction of the study area significantly increased from 46.2% in Period I (1992Period I ( -1994 to 76.5% in Period II (2004)(2005)(2006) and then slightly decreased to 73.2% in Period III (2011. From Period I to Period II, the area-specific sediment yield (ASY) sharply decreased by 55%. In Period II, the "source" vegetation patches were found further away from the water bodies, and were more likely to be located on gentler slopes than in Period I. From Period II to Period III, the ASY sharply increased by 83%. In Period III, "source" patches were found closer to the water bodies than in Period II, whereas the "sink" patches were found further away from the water bodies. The high statistical correlation between LCIs/mLCIs and ASY indicated a sensitive response of the sediment yield to vegetation cover changes that significantly altered the sediment transport processes in the study area. The ASY was better correlated with the mLCI than with the LCI. Three key harnessing sub-watersheds of the Ganjiang watershed were identified by calculating the mLCIs: Qingfengshan, Yuanhe, and Jinjiang. This study supported watershed ecological management in the Poyang Lake drainage area and provided a methodology reference for future sediment transport process studies.

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An assessment of erosivity distribution and its influence on the effectiveness of land use conversion for reducing soil erosion in Jiangxi, China

Cited by 53 publications

References 50 publications

Changes and influencing factors of the sediment load in the Xiliugou basin of the upper Yellow River, China

Changes and influencing factors of the sediment load in the Xiliugou basin of the upper Yellow River, China

Variability of Rainfall Erosivity and Erosivity Density in the Ganjiang River Catchment, China: Characteristics and Influences of Climate Change

Responses of Sediment Yield to Vegetation Cover Changes in the Poyang Lake Drainage Area, China

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