Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithm
Soil erosion is an important cause of global land degradation and other ecological and environmental problems. Revealing the influence mechanism of land use/cover change (LUCC) on sediment yield can provide a scientific basis for efficient comprehensive and decision-making management of watersheds....
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-10-01
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| Series: | Geoderma |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0016706123002999 |
| _version_ | 1797689588117929984 |
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| author | Qin Zhang Wei Qin Lin Ding Wenhong Cao Haichao Xu Qi Liu Chenyu Shi |
| author_facet | Qin Zhang Wei Qin Lin Ding Wenhong Cao Haichao Xu Qi Liu Chenyu Shi |
| author_sort | Qin Zhang |
| collection | DOAJ |
| description | Soil erosion is an important cause of global land degradation and other ecological and environmental problems. Revealing the influence mechanism of land use/cover change (LUCC) on sediment yield can provide a scientific basis for efficient comprehensive and decision-making management of watersheds. As an important indicator of sediment yield and transport capacity, sediment connectivity has been widely studied in recent years. However, the existing index of sediment connectivity (IC) ignores the influence of upslope land use/cover on confluence and the corresponding changes in downslope sediment transport. Moreover, a formula describing the upslope and downslope components does not establish an effective correlation with existing soil erosion formulas. Therefore, the index is not closely related to the erosion process and does not reflect the physical process of sediment transport and sediment deposition. In addition, there have been few reports concerning the effect of LUCC on sediment connectivity inside (on-site impact) and outside (off-site impact) the changed patches. Consequently, by based on addition of the revised parameters of the effective confluence area (Ar) and the runoff velocity factor (v) of the sediment delivery distributed (SEDD) model, an improved sediment connectivity index (ICZQ) is proposed. The results indicate that ICZQ has a significant linear relationship with annual runoff depth or sediment yield modulus in small watersheds within 100 km2 in the Loess Plateau, except for feature years containing rainstorm events (daily rainfall exceeding 50 mm). Therefore, the runoff and sediment transport capacity of small watersheds can be characterized by ICZQ under the influence of LUCC and rainfall change. In 1982–2020, driven by LUCC with an enhancement in vegetation (forest and grass), the ICZQ decreased in 90% of the area and decreased by a significant or extremely significant level over 48% of the area. To better understand the effects of LUCC on sediment connectivity, we analyzed on-site and off-site impacts with rainfall remaining unchanged to control the variables. The contribution rates of the on-site and off-site impacts caused by LUCC on sediment connectivity in Lvergou were 61% and 39%, 48% and 52%, respectively, over two typical periods (1985–1990 and 2015–2020). Due to the large proportion that off-site impacts occupied in the sediment connectivity change, the impact of LUCC on sediment connectivity cannot be ignored, especially when the associated scale is relatively small. The present study provides a quantitative method for the optimization of land use/cover patterns, such as vegetation restoration in watersheds along with a reference for further revealing the impact mechanism of erosion and sediment yield in watersheds. |
| first_indexed | 2024-03-12T01:47:45Z |
| format | Article |
| id | doaj.art-c2574e081df14148a82d23483920a2d1 |
| institution | Directory Open Access Journal |
| issn | 1872-6259 |
| language | English |
| last_indexed | 2024-03-12T01:47:45Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
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| series | Geoderma |
| spelling | doaj.art-c2574e081df14148a82d23483920a2d12023-09-09T04:54:13ZengElsevierGeoderma1872-62592023-10-01438116622Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithmQin Zhang0Wei Qin1Lin Ding2Wenhong Cao3Haichao Xu4Qi Liu5Chenyu Shi6State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, PR China; Research Center on Soil and Water Conservation of the Ministry of Water Resources, Beijing 100048, PR ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, PR China; Research Center on Soil and Water Conservation of the Ministry of Water Resources, Beijing 100048, PR China; Corresponding author at: China Institute of Water Resources and Hydropower Research, 20 Chegongzhuang West Road, Haidian District, Beijing 100048, PR China.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, PR China; Research Center on Soil and Water Conservation of the Ministry of Water Resources, Beijing 100048, PR ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, PR China; Research Center on Soil and Water Conservation of the Ministry of Water Resources, Beijing 100048, PR ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, PR China; Research Center on Soil and Water Conservation of the Ministry of Water Resources, Beijing 100048, PR ChinaScientific Trail Station of Soil and Water Conservation in Tianshui City, Water Conservancy Committee of Yellow River, Tianshui, 741000, PR ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100048, PR China; Research Center on Soil and Water Conservation of the Ministry of Water Resources, Beijing 100048, PR ChinaSoil erosion is an important cause of global land degradation and other ecological and environmental problems. Revealing the influence mechanism of land use/cover change (LUCC) on sediment yield can provide a scientific basis for efficient comprehensive and decision-making management of watersheds. As an important indicator of sediment yield and transport capacity, sediment connectivity has been widely studied in recent years. However, the existing index of sediment connectivity (IC) ignores the influence of upslope land use/cover on confluence and the corresponding changes in downslope sediment transport. Moreover, a formula describing the upslope and downslope components does not establish an effective correlation with existing soil erosion formulas. Therefore, the index is not closely related to the erosion process and does not reflect the physical process of sediment transport and sediment deposition. In addition, there have been few reports concerning the effect of LUCC on sediment connectivity inside (on-site impact) and outside (off-site impact) the changed patches. Consequently, by based on addition of the revised parameters of the effective confluence area (Ar) and the runoff velocity factor (v) of the sediment delivery distributed (SEDD) model, an improved sediment connectivity index (ICZQ) is proposed. The results indicate that ICZQ has a significant linear relationship with annual runoff depth or sediment yield modulus in small watersheds within 100 km2 in the Loess Plateau, except for feature years containing rainstorm events (daily rainfall exceeding 50 mm). Therefore, the runoff and sediment transport capacity of small watersheds can be characterized by ICZQ under the influence of LUCC and rainfall change. In 1982–2020, driven by LUCC with an enhancement in vegetation (forest and grass), the ICZQ decreased in 90% of the area and decreased by a significant or extremely significant level over 48% of the area. To better understand the effects of LUCC on sediment connectivity, we analyzed on-site and off-site impacts with rainfall remaining unchanged to control the variables. The contribution rates of the on-site and off-site impacts caused by LUCC on sediment connectivity in Lvergou were 61% and 39%, 48% and 52%, respectively, over two typical periods (1985–1990 and 2015–2020). Due to the large proportion that off-site impacts occupied in the sediment connectivity change, the impact of LUCC on sediment connectivity cannot be ignored, especially when the associated scale is relatively small. The present study provides a quantitative method for the optimization of land use/cover patterns, such as vegetation restoration in watersheds along with a reference for further revealing the impact mechanism of erosion and sediment yield in watersheds.http://www.sciencedirect.com/science/article/pii/S0016706123002999Sediment connectivityUpslope confluence areaLand use/cover changeSediment transport of watershedOff-site impactLoess Plateau |
| spellingShingle | Qin Zhang Wei Qin Lin Ding Wenhong Cao Haichao Xu Qi Liu Chenyu Shi Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithm Geoderma Sediment connectivity Upslope confluence area Land use/cover change Sediment transport of watershed Off-site impact Loess Plateau |
| title | Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithm |
| title_full | Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithm |
| title_fullStr | Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithm |
| title_full_unstemmed | Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithm |
| title_short | Impact of land use/cover change (LUCC) on sediment connectivity in small watersheds based on a revised index algorithm |
| title_sort | impact of land use cover change lucc on sediment connectivity in small watersheds based on a revised index algorithm |
| topic | Sediment connectivity Upslope confluence area Land use/cover change Sediment transport of watershed Off-site impact Loess Plateau |
| url | http://www.sciencedirect.com/science/article/pii/S0016706123002999 |
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