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Article ; Online: Linking Land Cover Change with Landscape Pattern Dynamics Induced by Damming in a Small Watershed

Zheyu Xie / Jihui Liu / Jinliang Huang / Zilong Chen / Xixi Lu

Remote Sensing, Vol 14, Iss 3580, p

2022 Volume 3580

Abstract: Cascade damming can shape land surfaces; however, little is known about the specific impacts of dam construction on watershed land cover changes. Therefore, we developed a framework in which remote sensing, transition patterns, and landscape metrics were ...

Abstract	Cascade damming can shape land surfaces; however, little is known about the specific impacts of dam construction on watershed land cover changes. Therefore, we developed a framework in which remote sensing, transition patterns, and landscape metrics were coupled to measure the impact of dam construction on watershed land cover changes and landscape patterns in the Longmen–Su (L–S) Creek, a small headwater watershed in Southeast China. During the transition and post-impact periods of dam construction, the land cover in the L–S Creek watershed underwent dynamic changes within the affected area. Changes in land cover were dominated by a surge in water and buildup and a decrease in woodland and cropland areas; bareland also increased steadily during construction. Woodlands and croplands were mainly flooded into water areas, although some were converted to bareland and built-up areas owing to the combined impact of dam construction and urbanization. By linking land cover changes with landscape patterns, we found that land use changes in water were significantly associated with landscape fragmentation and heterogeneity in the impacted zone. Our research demonstrates how damming can change land cover locally and may provide a basis for sustainable land management within the context of the extensive development of cascade hydropower dams.
Keywords	cascade dam ; small-scale watershed ; intensity analysis ; land cover change ; landscape pattern ; Science ; Q
Language	English
Publishing date	2022-07-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Can restoring water and sediment fluxes across a mega-dam cascade alleviate a sinking river delta?

Chua, Samuel De Xun / Yang, Yuheng / Kondolf, G Mathias / Oeurng, Chantha / Sok, Ty / Zhang, Shurong / Xixi, Lu

Science advances

2024 Volume 10, Issue 18, Page(s) eadn9731

Abstract: Hydropower, although an attractive renewable energy source, can alter the flux of water, sediments, and biota, producing detrimental impacts in downstream regions. The Mekong River illustrates the impacts of large dams and the limitations of conventional ...

Abstract	Hydropower, although an attractive renewable energy source, can alter the flux of water, sediments, and biota, producing detrimental impacts in downstream regions. The Mekong River illustrates the impacts of large dams and the limitations of conventional dam regulating strategies. Even under the most optimistic sluicing scenario, sediment load at the Mekong Delta could only recover to 62.3 ± 8.2 million tonnes (1 million tonnes = 10
Language	English
Publishing date	2024-05-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	2810933-8
ISSN	2375-2548 ; 2375-2548
ISSN (online)	2375-2548
ISSN	2375-2548
DOI	10.1126/sciadv.adn9731
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Impacts of Climate Change on Lake Fluctuations in the Hindu Kush-Himalaya-Tibetan Plateau

Xiankun Yang / Xixi Lu / Edward Park / Paolo Tarolli

Remote Sensing, Vol 11, Iss 9, p

2019 Volume 1082

Abstract: Lakes in the Hindu Kush-Himalaya-Tibetan (HKHT) regions are crucial indicators for the combined impacts of regional climate change and resultant glacier retreat. However, they lack long-term systematic monitoring and thus their responses to recent ... ...

Abstract	Lakes in the Hindu Kush-Himalaya-Tibetan (HKHT) regions are crucial indicators for the combined impacts of regional climate change and resultant glacier retreat. However, they lack long-term systematic monitoring and thus their responses to recent climatic change still remain only partially understood. This study investigated lake extent fluctuations in the HKHT regions over the past 40 years using Landsat (MSS/TM/ETM+/OLI) images obtained from the 1970s to 2014. Influenced by different regional atmospheric circulation systems, our results show that lake changing patterns are distinct from region to region, with the most intensive lake shrinking observed in northeastern HKHT (HKHT Interior, Tarim, Yellow, Yangtze), while the most extensive expansion was observed in the western and southwestern HKHT (Amu Darya, Ganges Indus and Brahmaputra), largely caused by the proliferation of small lakes in high-altitude regions during 1970s−1995. In the past 20 years, extensive lake expansions (~39.6% in area and ~119.1% in quantity) were observed in all HKHT regions. Climate change, especially precipitation change, is the major driving force to the changing dynamics of the lake fluctuations; however, effects from the glacier melting were also significant, which contributed approximately 31.9−40.5%, 16.5−39.3%, 12.8−29.0%, and 3.3−6.1% of runoff to lakes in the headwaters of the Tarim, Amu Darya, Indus, and Ganges, respectively. We consider that the findings in this paper could have both immediate and long-term implications for dealing with water-related hazards, controlling glacial lake outburst floods, and securing water resources in the HKHT regions, which contain the headwater sources for some of the largest rivers in Asia that sustain 1.3 billion people.
Keywords	lake fluctuation ; remote sensing ; climate change ; glacier retreat ; Hindu Kush Himalayas ; Tibetan Plateau ; Science ; Q
Subject code	550
Language	English
Publishing date	2019-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Geomorphometric Assessment of the Impacts of Dam Construction on River Disconnectivity and Flow Regulation in the Yangtze Basin

Xiankun Yang / Xixi Lu / Lishan Ran / Paolo Tarolli

Sustainability, Vol 11, Iss 12, p

2019 Volume 3427

Abstract: Rivers are under increasing pressure from anthropogenic impacts with incremental dam construction, experiencing global and regional alteration due to river disconnectivity, flow regulation, and sediment reduction. Assessing the cumulative impacts of dams ...

Abstract	Rivers are under increasing pressure from anthropogenic impacts with incremental dam construction, experiencing global and regional alteration due to river disconnectivity, flow regulation, and sediment reduction. Assessing the cumulative impacts of dams on river disconnectivity in large river basins can help us better understand how humans disintegrate river systems and change the natural flow regimes. Using the Yangtze basin as the study area, this study employed three modified metrics (river connectivity index, RCI; basin disconnectivity index, BDI; and the degree of regulation for each river section, DOR) to evaluate the cumulative impacts on river disconnectivity over the past 50 years. The results indicated that the Yangtze had experienced strong alterations, despite varying degrees and spatial patterns. Among the major tributaries, the greatest impact (lowest RCI value) happened in the Wu tributary basin due to the construction of cascade dams on the main stem of the tributary, while the lowest impact (highest RCI value) happened in the Fu tributary basin, which still has no dams on its main stem. Collectively, rivers in the upper Yangtze reaches experienced more serious disturbances than their counterparts in the middle and lower reaches. The BDI results displayed that a substantial part of the Yangtze River, especially the Wu, Min, Jialing, and Yuan tributaries, only maintain connectivity among one to three representative river systems. No part of the Yangtze connects all the 12 representative river systems. This study also revealed that small dams can also exert significant impacts in flow regulation on regional river systems through their sheer number and density. The study results can help promote more environmentally sustainable river management policies in the Yangtze basin.
Keywords	geomorphometric assessment ; river disconnectivity ; Yangtze River ; hydropower dams ; river regulation ; anthropogenic impacts ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Subject code	550 ; 910
Language	English
Publishing date	2019-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Integrated decision-making model for groundwater potential evaluation in mining areas using the cusp catastrophe model and principal component analysis

Xiaofei Sun / Yingzhi Zhou / Linguo Yuan / Xianfeng Li / Huaiyong Shao / Xixi Lu

Journal of Hydrology: Regional Studies, Vol 37, Iss , Pp 100891- (2021)

2021

Abstract: Study Region: Panxi mining area (15061 km2, located in Sichuan, China). Study Focus: This study aims to delineate groundwater potential zones in mining areas using a new method based on the cusp catastrophe model (CCM) and principal component analysis ( ... ...

Abstract	Study Region: Panxi mining area (15061 km2, located in Sichuan, China). Study Focus: This study aims to delineate groundwater potential zones in mining areas using a new method based on the cusp catastrophe model (CCM) and principal component analysis (PCA). First, 13 indicators were selected from natural and anthropogenic dimensions, and a comprehensive analysis of the indicators was performed using PCA. Second, the results of the PCA were considered as control variables, and the CCM was used for groundwater potential evaluation modeling. Finally, the receiver operating characteristic (ROC) curve was used to validate the new method and compare it with catastrophe fuzzy membership functions (CFMFs). New Hydrological Insights for the Region: The results suggest that the area under the ROC curve of the success and prediction rate accounted for approximately 0.85 and 0.76, respectively, in the new method, which were higher than those in the CFMFs. The largest area (39 %) with groundwater potential in the study area has a “moderate” groundwater potential status, followed by an area (28 %) with a “good” status, an area (20 %) with a “poor” status, and areas (12 % and 1%) with “very good” and “very poor” statuses, respectively. The groundwater potential in the study area was unevenly distributed and changed drastically. Topography, drainage density, and land use/land cover had the highest contribution in the modeling process.
Keywords	Groundwater potential mapping ; Groundwater management ; Spatial modeling ; Multicriteria decision-making ; Evaluation indicators ; Physical geography ; GB3-5030 ; Geology ; QE1-996.5
Subject code	550
Language	English
Publishing date	2021-10-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Assessment of vegetation growth and drought conditions using satellite-based vegetation health indices in Jing-Jin-Ji region of China

Rengui Jiang / Jichao Liang / Yong Zhao / Hao Wang / Jiancang Xie / Xixi Lu / Fawen Li

Scientific Reports, Vol 11, Iss 1, Pp 1-

2021 Volume 18

Abstract: Abstract Terrestrial vegetation growth activity plays pivotal roles on regional development, which has attracted wide attention especially in water resources shortage areas. The paper investigated the spatiotemporal change characteristics of vegetation ... ...

Abstract	Abstract Terrestrial vegetation growth activity plays pivotal roles on regional development, which has attracted wide attention especially in water resources shortage areas. The paper investigated the spatiotemporal change characteristics of vegetation growth activity using satellite-based Vegetation Health Indices (VHIs) including smoothed Normalized Difference Vegetation Index (SMN), smoothed Brightness Temperature (SMT), Vegetation Condition Index (VCI), Temperature Condition Index (TCI) and VHI, based on 7-day composite temporal resolution and 16 km spatial resolution gridded data, and also estimated the drought conditions for the period of 1982–2016 in Jing-Jin-Ji region of China. The Niño 3.4 was used as a substitution of El Niño Southern Oscillation (ENSO) to reveal vegetation sensitivity to ENSO using correlation and wavelet analysis. Results indicated that monthly SMN has increased throughout the year especially during growing season, starts at approximate April and ends at about October. The correlation analysis between SMN and SMT, SMN and precipitation indicated that the vegetation growth was affected by joint effects of temperature and precipitation. The VCI during growing season was positive trends dominated and vice versa for TCI. The relationships between VHIs and drought make it possible to identify and quantify drought intensity, duration and affected area using different ranges of VHIs. Generally, the intensity and affected area of drought had mainly decreased, but the trends varied for different drought intensities, regions and time periods. Large-scale global climate anomalies such as Niño 3.4 exerted obvious impacts on the VHIs. The Niño 3.4 was mainly negatively correlated to VCI and positively correlated to TCI, and the spatial distributions of areas with positive (negative) correlation coefficients were mainly opposite. The linear relationships between Niño 3.4 and VHIs were in accordance with results of nonlinear relationships revealed using wavelet analysis. The results are of great ...
Keywords	Medicine ; R ; Science ; Q
Subject code	910
Language	English
Publishing date	2021-07-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Effective soil erosion control represents a significant net carbon sequestration

Lishan Ran / Xixi Lu / Nufang Fang / Xiankun Yang

Scientific Reports, Vol 8, Iss 1, Pp 1-

2018 Volume 8

Abstract: Abstract The debate over whether soil erosion is a carbon (C) sink or atmospheric CO2 source remains highly controversial. For the first time, we report the magnitude of C stabilization associated with soil erosion control for an entire large river basin. ...

Abstract	Abstract The debate over whether soil erosion is a carbon (C) sink or atmospheric CO2 source remains highly controversial. For the first time, we report the magnitude of C stabilization associated with soil erosion control for an entire large river basin. The soil erosion of the Yellow River basin in northern China is among the most severe worldwide. Progressive soil conservation has been implemented by the Chinese government since the 1970s, including the largest ever revegetation programme, the Grain-for-Green Project, which began in 1999. Based on compiled hydrological records and organic carbon (OC) data, together with primary production estimates, we evaluated the sequestered OC resulting from soil conservation. Compared with that at baseline in 1950–1970, in which significant soil conservation did not occur, the fate of erosion-induced OC was substantially altered in the period from 2000–2015. Approximately 20.6 Tg of OC were effectively controlled per year by soil conservation efforts. Simultaneously, the decomposition of erosion-induced soil organic carbon (SOC) declined from 8 Tg C yr−1 to current 5.3 Tg C yr−1. The reduced C emissions (2.7 Tg C yr−1) within the Yellow River basin alone account for 12.7% of the mean C accumulation acquired via forest expansion throughout all of China previously assessed. If the accumulated C in restored plants and soils was included, then 9.7 Tg C yr−1 was reduced from the atmospheric C pool during this period, which represents a tremendous C-capturing benefit. Thus, the increased C storage obtained via soil conservation should be considered in future C inventories.
Keywords	Medicine ; R ; Science ; Q
Language	English
Publishing date	2018-08-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Distribution and storage of soil organic and inorganic carbon in steppe riparian wetlands under human activity pressure

Xinyu Liu / Xixi Lu / Ruihong Yu / Heyang Sun / Xiangwei Li / Xiang Li / Zhen Qi / Tingxi Liu / Changwei Lu

Ecological Indicators, Vol 139, Iss , Pp 108945- (2022)

2022

Abstract: Soil organic carbon (SOC) and soil inorganic carbon (SIC) are key components of the global wetland soil carbon pool, which plays a crucial role in carbon cycling. However, research on carbon storage in riparian wetland soils, especially in inland steppe ... ...

Abstract	Soil organic carbon (SOC) and soil inorganic carbon (SIC) are key components of the global wetland soil carbon pool, which plays a crucial role in carbon cycling. However, research on carbon storage in riparian wetland soils, especially in inland steppe river environments impacted by human activities, is relatively scarce. Thus, we evaluated the SOC and SIC distributions and storage in riparian wetland soils under the pressure of human activities in the Xilin River Basin (XRB). We collected surface and profile soil samples, determined the SOC and SIC contents, aboveground biomass, and soil physicochemical properties, and calculated the SOC and SIC storage (SOCs and SICs) values. The surface soil SOC content decreased substantially from the upstream to the downstream zones (mean value range: 76.30–3.18 g/kg), and the SIC content showed the opposite trend (mean value range: 0.08–34.38 g/kg). The SIC content of the riparian wetlands along the permanently flowing stretch of river was much lower than that in the wetlands along the intermittently flowing stretch. In the XRB, the SOCs was primarily affected by vegetation coverage, soil water content, and soil pH, whereas the SICs was greatly affected by soil texture. A dry lake zone was markedly affected by wetland degradation, indicating a potential increase in the decomposition rate of the surface soil SOC; however, the SOC in the deep soils was relatively stable. The high SIC content most likely resulted from weathering, resuspension, and carbonate rock reprecipitation. Compared to different steppe grassland types, riparian wetlands appear to be potential hotspots of SOCs and SICs in the Inner Mongolian region. Riparian wetland SOCs in the upstream zones was substantially greater than in adjacent terrestrial locations. However, the SOCs in the downstream wetlands was similar to that in the grasslands. Under the impact of human activities, the water and soil environments in the downstream zone of the Xilin River were substantially modified, leading to severe wetland ...
Keywords	Riparian wetlands ; Soil organic carbon ; Soil inorganic carbon ; Storage ; Human activities ; Wetland degradation ; Ecology ; QH540-549.5
Subject code	550
Language	English
Publishing date	2022-06-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: How to Balance Green and Grain in Marginal Mountainous Areas?

Yi Zeng / Lishan Ran / Nufang Fang / Zhen Wang / Zhenci Xu / Xixi Lu / Qiang Yu / Ling Wang / Shuxia Yu / Zhihua Shi

Earth's Future, Vol 10, Iss 5, Pp n/a-n/a (2022)

2022

Abstract: Abstract China has implemented the world's largest‐ever vegetation restoration program in marginal mountainous areas to sustain life on land. However, land competition between the demand for grain and the need for green has threatened sustainable ... ...

Abstract	Abstract China has implemented the world's largest‐ever vegetation restoration program in marginal mountainous areas to sustain life on land. However, land competition between the demand for grain and the need for green has threatened sustainable vegetation restoration. Here, focusing on China's marginal mountainous areas with the highest density of slope cropland, we explore the optimal solution in the trade‐offs between green and grain. We find that current vegetation restoration strategies are not sufficiently optimized, which may threaten the survival and development of local farmers and in turn destroy existing vegetation restoration achievements. Through adjusting vegetation restoration objectives carefully tailored to local conditions, the population experiencing grain shortages can be greatly reduced by 51–66% (from 18.26 million to 6.29–8.90 million) compared with the current scheme. The optimal design will alleviate the conflict between grain and green, thereby promoting sustainable ecological restoration in China. Our research provides an important reference for the world's mountainous areas to achieve a win‐win situation between green and grain.
Keywords	sustainable vegetation restoration ; Grain for Green Program ; marginal mountainous areas ; slope cropland ; scenario analysis ; Environmental sciences ; GE1-350 ; Ecology ; QH540-549.5
Subject code	669
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	Wiley
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: CO2 partial pressure and CO2 degassing in the Daning River of the upper Yangtze River, China

Ni, Maofei / Jiachen Luo / Siyue Li / Xixi Lu

Journal of hydrology. 2019 Feb., v. 569

2019

Abstract: Rivers and streams are important agents for global and regional carbon cycle, which represent a nonnegligible carbon source to the atmosphere. However, carbon dioxide (CO2) degassing via water-air interface from inland waters currently has a large ... ...

Abstract	Rivers and streams are important agents for global and regional carbon cycle, which represent a nonnegligible carbon source to the atmosphere. However, carbon dioxide (CO2) degassing via water-air interface from inland waters currently has a large uncertainty in estimation. Here we examined the CO2 partial pressure (pCO2) and CO2 degassing in the Daning River, a main tributary of the Yangtze in the Three Gorges Reservoir (TGR) region. The riverine pCO2 showed obvious spatial and temporal variations on the main stem and its tributaries, ranging from 483.2 ± 293.9 μatm (May) to 2183.3 ± 1309.2 μatm (August) with an average of 1198.2 ± 1122.9 μatm. pCO2 increased with the intensive agricultural practices and population on the lower reach of the tributary. The daytime average water-air CO2 flux was 329.8 ± 470.2 mmol/m2/d, and yielded a total CO2 efflux approximately 0.12 Tg CO2/y. The results also indicated that carbon loss via atmospheric exchange accounted for 38.8% of riverine dissolved carbon fluxes. There were close relations between pCO2 and environmental parameters such as total dissolved nitrogen (TDN), total dissolved phosphorus (TDP) and water temperature in the rainy season, but not in the dry season. Our results demonstrated the essential need to highlight the importance of anthropogenic activities on global and regional CO2 outgassing, and it is urgent to underscore the detailed biogeochemical processes in riverine pCO2, as well as the couplings between pCO2 and environmental parameters.
Keywords	anthropogenic activities ; carbon ; carbon cycle ; carbon dioxide ; carbon dioxide production ; deaeration ; dry season ; environmental factors ; hydrology ; liquid-air interface ; rivers ; streams ; temporal variation ; total dissolved nitrogen ; total dissolved phosphorus ; uncertainty ; water reservoirs ; water temperature ; wet season ; China ; Yangtze River
Language	English
Dates of publication	2019-02
Size	p. 483-494.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1473173-3
ISSN	0022-1694
ISSN	0022-1694
DOI	10.1016/j.jhydrol.2018.12.017
Database	NAL-Catalogue (AGRICOLA)

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