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Article ; Online: Sensitivity and attribution analysis of vegetation changes on evapotranspiration with the Budyko framework in the Baiyangdian catchment, China

Henian Wang / Xizhi Lv / Manyin Zhang

Ecological Indicators, Vol 120, Iss , Pp 106963- (2021)

2021

Abstract: Due to its role in intercepting and evaporating water, vegetation has a great influence on the catchment hydrological process, and an increased quantitative understanding of how vegetation changes affect the terrestrial water cycle is of considerable ... ...

Abstract	Due to its role in intercepting and evaporating water, vegetation has a great influence on the catchment hydrological process, and an increased quantitative understanding of how vegetation changes affect the terrestrial water cycle is of considerable interest for a range of spatial scales. In this study, we determine the effects of vegetation changes on evapotranspiration within the Budyko framework by adapting an analytical expression between vegetation and the Budyko parameter at a steady state. We then analyzed the attributions for evapotranspiration change in the Baiyangdian catchment and quantified the effects of vegetation change. The evapotranspiration changes during 1998–2017 in the Baiyangdian catchment were mainly caused by climate change, which accounted for 58.56%, and the contribution of the Budyko parameter (n) change to evapotranspiration was 40.04%. Among the impact factors, the effect of vegetation change on evapotranspiration was not the largest, with vegetation changes in the Baiyangdian catchment resulting in a decrease in evapotranspiration of 22.9715 mm, but only accounting for 10.23%. And we also discuss the spatial pattern of the sensitivities of evapotranspiration to vegetation based on the 66 catchments in the Hai River basin, and the results indicate that an increase in the normalized difference vegetation index (NDVI) would cause a decrease in evapotranspiration in dry regions (W < 1) and cause an increase in evapotranspiration in wet regions (W > 1). Evapotranspiration was more sensitive to NDVI changes in regions of W closer to 1.
Keywords	Attribution analysis ; Sensitivity ; Budyko parameter ; Evapotranspiration ; Vegetation ; Ecology ; QH540-549.5
Subject code	550
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Sensitivity and attribution analysis based on the Budyko hypothesis for streamflow change in the Baiyangdian catchment, China

Henian Wang / Xizhi Lv / Manyin Zhang

Ecological Indicators, Vol 121, Iss , Pp 107221- (2021)

2021

Abstract: In the past 50 years, the decrease of river runoff in China has attracted wide attention from government decision-making departments and the public. The Baiyangdian catchment is one of the regions with the most serious water shortage and the most ... ...

Abstract	In the past 50 years, the decrease of river runoff in China has attracted wide attention from government decision-making departments and the public. The Baiyangdian catchment is one of the regions with the most serious water shortage and the most prominent human-water conflicts, and attribution analysis of the runoff change is of considerable interest at a range of spatial scales. The Budyko framework has been widely used to attribute changes in streamflow to the effects of climate and catchment changes. In this study, we used the elasticity method based on the Budyko framework to examine the sensitivity of streamflow to climate and catchment variables, which indicated that a 1-mm decrease in precipitation would induce a 0.3546-mm decrease in streamflow, a 1-mm decrease in potential evapotranspiration would induce a 0.1045-mm increase in streamflow, and an increase of 1 in the catchment characteristic coefficient would induce a 79.6711-mm decrease in streamflow. The absolute sensitivities of streamflow to climate variables decreased with increases in the aridity index, which indicates that the streamflow was more sensitive to climate change in wet regions. Among the total changes in streamflow (−43.41 mm), the effect of climate change was +3.86 mm (accounting for 7.55%), and the effect of the catchment characteristic changes is −45.99 mm (accounting for 89.95%) based on the sensitivity analyses. The results indicate that streamflow changes in the Baiyangdian catchment are mainly caused by catchment changes.
Keywords	Attribution analysis ; Budyko hypothesis ; Streamflow change ; Baiyangdian catchment ; Ecology ; QH540-549.5
Subject code	550
Language	English
Publishing date	2021-02-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Sensitivity analysis of runoff to climate variability and land-use changes in the Haihe Basin mountainous area of north China

Wang, Dandan / Guodong Jia / Henian Wang / Xinxiao Yu

Agriculture, ecosystems & environment. 2019 Jan. 01, v. 269

2019

Abstract: Runoff has changed significantly in most regions in China over the past decades. Climate variability and land-use changes are considered to be the two main factors contributing to runoff variation. Investigating the mechanism of runoff variation is of ... ...

Abstract	Runoff has changed significantly in most regions in China over the past decades. Climate variability and land-use changes are considered to be the two main factors contributing to runoff variation. Investigating the mechanism of runoff variation is of great significance for the sustainable utilization of water resources. In this study, Mann-Kendall test, double cumulative curve method, and runoff sensitivity analysis method are adopted to separate and quantify the relative impacts of climate variability and land-use changes on runoff. Furthermore, the sensitivities of runoff were estimated with regard to these two factors in north China during the study period from 1957 to 2000. The results revealed a significant decreasing trend in annual runoff and indicated that land-use changes had a greater effect on runoff than climate variability since 1979. The runoff decline due to land-use changes was 68.33%, whereas the runoff decline due to climate variability was only 30.85%. Further analysis of the sensitivities of runoff to climate variability and land-use changes suggested that, with a 10% increase in precipitation, the runoff will increase by 35.1%; while a 10% increase in potential evapotranspiration or the aridity index will induce 25.1% or 27.5% decrease in runoff, respectively. The sensitivity coefficients of runoff to precipitation, potential evapotranspiration and aridity index (εP, εEP and εφ), and runoff ratio (Q/P) and the aridity index exhibited a significant nonlinear negative correlation (Y = ax−b, R2 > 0.85), and a positive linear correlation (Y = ax + b, R2 < 0.50), respectively. All these results implied that runoff is more sensitive to the regions with water scarcity and drying climate. The average sensitivity coefficients of runoff to forest, grassland, and farmland were 1.46, 1.21 and 1.18, respectively. This means that a 10% increase in forest, grassland, and farmland coverage would induce 1.46, 1.21, and 1.18 mm decrease of runoff, respectively. This demonstrates that forests have the most effective impact on runoff reduction, followed by grassland or farmland.
Keywords	agricultural land ; basins ; climate ; dry environmental conditions ; drying ; evapotranspiration ; forests ; grasslands ; land use change ; mountains ; runoff ; water shortages ; China
Language	English
Dates of publication	2019-0101
Size	p. 193-203.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	602345-9
ISSN	1873-2305 ; 0167-8809
ISSN (online)	1873-2305
ISSN	0167-8809
DOI	10.1016/j.agee.2018.09.025
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: The effects of climate and catchment characteristic change on streamflow in a typical tributary of the Yellow River

Xizhi Lv / Zhongguo Zuo / Yongxin Ni / Juan Sun / Henian Wang

Scientific Reports, Vol 9, Iss 1, Pp 1-

2019 Volume 10

Abstract: Abstract Hydrological cycle changes that occur due to a changing environment is a hot topic in the field of hydrological science. It is of great practical significance to study the response mechanism of hydrological process change for future water ... ...

Abstract	Abstract Hydrological cycle changes that occur due to a changing environment is a hot topic in the field of hydrological science. It is of great practical significance to study the response mechanism of hydrological process change for future water resources planning and management. In this study, the effects of climate and watershed characteristic change on the streamflow in a typical tributary of the Yellow River (the Fen River watershed) are studied based on the Budyko hypothesis. The results show that: the sensitivity coefficients of streamflow to precipitation, potential evapotranspiration, and the watershed characteristic coefficient were 0.1809, −0.0551, and −27.0882, respectively. This meant that a 1 mm decrease in the precipitation would induce a 0.1809 mm decrease in the streamflow. Additionally, a 1 mm decrease in the potential evapotranspiration would induce a 0.0551 mm increase in the streamflow, and an increase of 1 in the watershed characteristic coefficient would induce a 27.0882 mm decrease in the streamflow. The streamflow of the Fen River watershed showed a significant decreasing trend during the reference period (1951–1977). In addition, the streamflow of the change period (1978–2010) decreased 26.87 mm; and this was primarily caused by watershed characteristic change which accounted for 92.27%, while climate change only accounted for 6.50%.
Keywords	Medicine ; R ; Science ; Q
Subject code	550
Language	English
Publishing date	2019-10-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Estimating leaf mercury content in Phragmites australis based on leaf hyperspectral reflectance

Weiwei Liu / Mengjie Li / Manyin Zhang / Daan Wang / Ziliang Guo / Songyuan Long / Si Yang / Henian Wang / Wei Li / Yukun Hu / Yuanyun Wei / Hongye Xiao

Ecosystem Health and Sustainability, Vol 6, Iss

2020 Volume 1

Abstract: Introduction: High mercury (Hg) concentrations affect the chlorophyll in leaves, thereby modifying leaf spectra. Hyperspectra is a promising technique for the rapid, nondestructive evaluation of leaf Hg content. In this study, we investigated Hg contents ...

Abstract	Introduction: High mercury (Hg) concentrations affect the chlorophyll in leaves, thereby modifying leaf spectra. Hyperspectra is a promising technique for the rapid, nondestructive evaluation of leaf Hg content. In this study, we investigated Hg contents and reflective hyperspectra of reed leaves (Phragmites communis) in a gold mining (Jilin province, China). Spectral parameters sensitive to Hg content were identified through basic spectral transformations, continuous wavelet transformation (CWT), and spectral indices techniques. Leaf Hg inversion models were developed using stepwise multiple linear regression, partial least squares regression, and random forest algorithms.Outcomes: The results indicated that: 1) leaf Hg content decreased with increasing distance from the mine: Jiapigou (JPG) > Erdaocha (EDC) > Laojingchang (LJC) > Erdaogou (EDG) > Lingqian (LQ) > Weishahe (WSH). 2) Hg–sensitive wavelengths were primarily in the visible region; CWT increased the correlation between hyperspectral data and leaf Hg content, and improved the regression and accuracy of inversion; 3) the continuum removal–CWT–stepwise multiple linear regression was better for estimating low leaf Hg content; while the differential spectral index–partial least squares regression was better for estimating high leaf Hg content.Conclusion: These hyperspectral inversion methods could be used for rapid, nondestructive monitoring of wetland plants.
Keywords	mercury pollution ; reed leaf ; hyperspectrum ; inversion model ; nondestructive monitoring ; Ecology ; QH540-549.5
Subject code	580
Language	English
Publishing date	2020-12-01T00:00:00Z
Publisher	Taylor & Francis Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Simulated erosion using soils from vegetated slopes in the Jiufeng Mountains, China

Sun, Jiamei / Hanzhi Li / Henian Wang / Hongru Liang / Xinxiao Yu / Yu Chang / Zhihua Tu

Catena. 2016 Jan., v. 136

2016

Abstract: The effects of rainfall intensity, slope gradient and vegetation cover on the intensity of runoff and rate of soil erosion were examined with simulated rainfall. All five affected soil erosion in experimental soil boxes containing Vitex negundo var. ... ...

Abstract	The effects of rainfall intensity, slope gradient and vegetation cover on the intensity of runoff and rate of soil erosion were examined with simulated rainfall. All five affected soil erosion in experimental soil boxes containing Vitex negundo var. heterophylla (VN), VN with litter (VN-L), Broussonetia papyrifera (BP), BP with litter (BP-L), and a control with bare land (BL). The presence of the vegetation and litter layers significantly reduced the rates of sediment yields, the mean rate of sediment yield values of BP-L, BP, VN-L, VN and BL were 2.873g/min, 11.264g/min, 4.220g/min, 16.781g/min and 21.594g/min, respectively. The mean rates of sediment yield increased linearly with increases of rainfall intensity and slope gradient, but not beyond a certain gradient. B. papyrifera reduced sediments by 6.24 and 25.55% more than V. negundo var. heterophylla with and without litter layers, respectively. The rate of sediment yield was positively and linearly correlated with runoff shear force, with rates increasing quickly in VN, and the critical runoff shear force of BP was 0.8282N/m2, and VN was 0.2098N/m2. The results of this study will help to determine appropriate methods for reducing soil erosion.
Keywords	Broussonetia papyrifera ; mountains ; rain intensity ; rainfall simulation ; runoff ; sediment yield ; sediments ; soil ; soil erosion ; vegetation cover ; Vitex negundo ; China
Language	English
Dates of publication	2016-01
Size	p. 128-134.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	519608-5
ISSN	1872-6887 ; 0008-7769 ; 0341-8162
ISSN (online)	1872-6887 ; 0008-7769
ISSN	0341-8162
DOI	10.1016/j.catena.2015.02.019
Database	NAL-Catalogue (AGRICOLA)

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Article: Environmental relationships with the interannual and seasonal variation of soil respiration in a cedar (Platycladus orientalis) plantation in northern China

Pang, Zhuo / Xinxiao Yu / Tianshan Zha / Guodong Jia / Hailong Wu / Xizhi Lv / Yitao Li / Bin Zhou / Minrui Fan / Siming Song / Yang Zhao / Zhiying Huang / Wenping Deng / Henian Wang / Yi Zhang / Zhige Yang / Dengxing Fan

Canadian journal of forest research =. 2012 Apr. 20, v. 42, no. 5

2012

Abstract: The relationships between soil respiration and environmental factors determine the effect of warming soil on the carbon balance in temperate forest ecosystems and on changes in atmospheric COâ concentrations. Here, we used 3Â years of data regarding ... ...

Abstract	The relationships between soil respiration and environmental factors determine the effect of warming soil on the carbon balance in temperate forest ecosystems and on changes in atmospheric COâ concentrations. Here, we used 3Â years of data regarding soil respiration rates (Râ), soil temperature (Tâ), and soil volumetric water content (Î¸) from a 50-year-old mature cedar (Platycladus orientalis L.) plantation at Jiufeng Mountain, Beijing, China, to demonstrate the seasonal and interannual variation of Râ dependence on Tâ and Î¸ throughout the period 2008â2010. We used the exponential model to calculate the temperature sensitivity indicator Qââ and we examined the annual and seasonal patterns of Râ and Qââ. The Râ correlated with Tâ annually (pÂ < 0.05). The RââTâ exponential relationship was significant in the autumn and winter (pÂ < 0.05), while the combined Tâ and Î¸ relationships with Râ were significant in the spring and summer (pÂ < 0.001). The spring Râ anomalies caused by drought appeared to have carryover effects that translated to Râ anomalies in the following summer. Finally, the summer Râ, which was influenced by the coincident precipitation and Î¸ anomalies, determined the magnitude of the annual total amount of soil respiration. This result has implications for how abiotic factors may drive shifts in seasonal patterns of soil respiration under a changing climate.
Keywords	Platycladus orientalis ; autumn ; carbon ; carbon dioxide ; climate change ; drought ; environmental factors ; forest ecosystems ; models ; seasonal variation ; soil heating ; soil respiration ; soil temperature ; spring ; summer ; temperate forests ; water content ; winter ; China
Language	English
Dates of publication	2012-0420
Size	p. 934-942.
Publishing place	NRC Research Press
Document type	Article
ZDB-ID	1473096-0
ISSN	1208-6037 ; 0045-5067
ISSN (online)	1208-6037
ISSN	0045-5067
DOI	10.1139/x2012-043
Database	NAL-Catalogue (AGRICOLA)

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Article: Environmental relationships with the interannual and seasonal variation of soil respiration in a cedar (Platycladus orientalis) plantation in northern China

Canadian journal of forest research =

Volume v. 42,, Issue no. 5

Abstract	The relationships between soil respiration and environmental factors determine the effect of warming soil on the carbon balance in temperate forest ecosystems and on changes in atmospheric COâ concentrations. Here, we used 3Â years of data regarding soil respiration rates (Râ), soil temperature (Tâ), and soil volumetric water content (Î¸) from a 50-year-old mature cedar (Platycladus orientalis L.) plantation at Jiufeng Mountain, Beijing, China, to demonstrate the seasonal and interannual variation of Râ dependence on Tâ and Î¸ throughout the period 2008â2010. We used the exponential model to calculate the temperature sensitivity indicator Qââ and we examined the annual and seasonal patterns of Râ and Qââ. The Râ correlated with Tâ annually (pÂ < 0.05). The RââTâ exponential relationship was significant in the autumn and winter (pÂ < 0.05), while the combined Tâ and Î¸ relationships with Râ were significant in the spring and summer (pÂ < 0.001). The spring Râ anomalies caused by drought appeared to have carryover effects that translated to Râ anomalies in the following summer. Finally, the summer Râ, which was influenced by the coincident precipitation and Î¸ anomalies, determined the magnitude of the annual total amount of soil respiration. This result has implications for how abiotic factors may drive shifts in seasonal patterns of soil respiration under a changing climate.
Language	English
Document type	Article
ISSN	1208-6037
Database	AGRIS - International Information System for the Agricultural Sciences and Technology

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