Simulation of <i>Populus euphratica</i> root uptake of groundwater in an arid woodland of the Ejina Basin, China

Zhu, Yonghua; Ren, Liliang; Skaggs, Todd H.; Lü, Haishen; Yu, Zhongbo; Wu, Yanqing; Fang, Xiuqin

doi:10.1002/hyp.7353

Cited by 80 publications

(59 citation statements)

References 28 publications

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“…Here we can only estimate the critical range in shallow groundwater table depth. Zhu et al (2009) We can estimate the magnitude of the fluctuations in groundwater table depth on the basis of the observations of Akiyama et al (2007) in the Ejina Oasis. They measured groundwater table depth daily for 14 months at three sites 20 m (Site 1), 300 m (Site 2) and 10 km (Site 3) from the river.…”

Section: Discussionmentioning

confidence: 99%

Phenological response of vegetation to upstream river flow in the Heihe Rive basin by time series analysis of MODIS data

Shang

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. Liquid and solid precipitation is abundant in the high elevation, upper reach of the Heihe River basin in northwestern China. The development of modern irrigation schemes in the middle reach of the basin is taking up an increasing share of fresh water resources, endangering the oasis and traditional irrigation systems in the lower reach. In this study, the response of vegetation in the Ejina Oasis in the lower reach of the Heihe River to the water yield of the upper catchment was analyzed by time series analysis of monthly observations of precipitation in the upper and lower catchment, river streamflow downstream of the modern irrigation schemes and satellite observations of vegetation index. Firstly, remotely sensed NDVI data acquired by Terra-MODIS are used to monitor the vegetation dynamic for a seven years period between 2000 and 2006. Due to cloud-contamination, atmospheric influence and different solar and viewing angles, however, the quality and consistence of time series of remotely sensed NDVI data are degraded. A Fourier Transform method -the Harmonic Analysis of Time Series (HANTS) algorithm -is used to reconstruct cloud-and noise-free NDVI time series data from the Terra-MODIS NDVI dataset. Modification is made on HANTS by adding additional parameters to deal with large data gaps in yearly time series in combination with a Temporal-Similarity-Statistics (TSS) method developed in this study to seek for initial values for the large gap periods. Secondly, the same Fourier Transform method is used to model time series of the vegetation phenology. The reconstructed cloud-free NDVI time series data are used to study the relationship between the water availability (i.e. the

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Section: Discussionmentioning

confidence: 99%

Phenological response of vegetation to upstream river flow in the Heihe Rive basin by time series analysis of MODIS data

Shang

et al. 2011

Hydrol. Earth Syst. Sci.

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“…Nevertheless, quantifying groundwater use is another issue. The contribution of groundwater to vegetation water use varies by crop [46], grass [47], and trees [39] according to the Richards equation. However, these studies did not consider the effect of thermal driving flow.…”

Section: Discussionmentioning

confidence: 99%

“…Likewise, a larger value of p was required to account for the steepness of the soil water retention curve. Similar to the approach reported by Zhu, Y., et al [39], we performed simulations using a range of values for h 50 and p in an effort to calibrate the HYDRUS-1D model. As expected for Aeolian sand, the simulated water contents were not very sensitive to h 50 and p. This finding agrees with the results of Zhu, Y., et al [39], which simulated Populus euphratica root uptake in coarse sand soil.…”

Section: Model Calibration and Validationmentioning

confidence: 99%

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Simulation of Water Use Dynamics by Salix Bush in a Semiarid Shallow Groundwater Area of the Chinese Erdos Plateau

Huang

Zhou

Hou

et al. 2015

Water

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Abstract:This study analyzed the water use of the Salix psammophila bush in a semi-arid area in northwest China using a Hydrus-1D model. The model incorporated the effect of thermally driven water flow coupling liquid water, water vapor and heat transport. The model was calibrated and validated using hourly field measurements of soil water content and temperature at different depths for a growing season of 154 days. Furthermore, another Hydrus-1D model was established to simulate environments with decreased heat, rainfall or temperature and an increased leaf area index using calibrated and validated parameters. Our results show that upward and downward thermally driven water vapor fluxes account for 0.11% and 0.28%, respectively, of the corresponding direction of total water flux during the bush's growing season. Although the vapor flux is very small, simulations incorporating heat flow revealed alterations in the temperature and pressure head gradients over the root zone, especially during dry periods. Consequently, the cumulative contributions of groundwater to evapotranspiration (ETg) with heat flow and without heat flow were 26.9% and 40.6%, respectively, during the simulation period. Therefore, the cumulative contribution of groundwater to ETg is overestimated when heat flow is excluded. Thus, we recommended that heat transport be incorporated when evaluating ETg in arid and semi-arid areas.

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“…The capillary for farmland, grassland and desert are much less and are 64.6 mm/year, 53.1 mm/year and 16.5 mm/year, respectively. This is because of the root of the plant in forest 10 could reach deep soil and the transpiration could cause higher moisture deficit pressure than other ecosystems (Zhu et al, 2009). …”

Section: Explicit Green and Blue Water Analysis For Different Ecosystemsmentioning

confidence: 99%

Assessing Green and Blue Water: Understanding Interactions and Making Balance between Human and Nature

Mao

Liu

Feng

et al. 2018

Preprint

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Abstract. Water resources assessment is crucial for human well-being and ecosystem's health. Assessments by considering both the blue and green water are of great significance as the green water plays a critical but often ignored role in the terrestrial ecosystem, especially in arid and semi-arid regions. Many approaches have been developed for green and blue 10 water valuation, while few of them considers the interrelationship between them. This study proposed a new framework for green and blue water assessment by considering the interactions between them in an arid endorheic river basin where hydrological cycling is dramatically altered by human activities. Results show that even though the green water is the dominant water resources, the blue water is also critical. Most of the blue water are transformed to green water through physically and human induced processes to meet the water demand of ecosystems. Time and spatial variability of water 15 supply and consumption forms totally different blue and green water regimes in different ecosystems. We also found that human use an increasing share of water with the decrease of the water availability. The massive water use by human reduces the water use for natural ecosystems. This indicates that natural ecosystems will take a higher risk of freshwater use when the water use competition increases. This study provides crucial information to better understand the interactions between green and blue water by assessing water resources in an explicit way. It also provides crucial implications for water 20 management aiming to make the balance between humankind and nature.

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Simulation of Populus euphratica root uptake of groundwater in an arid woodland of the Ejina Basin, China

Cited by 80 publications

References 28 publications

Phenological response of vegetation to upstream river flow in the Heihe Rive basin by time series analysis of MODIS data

Phenological response of vegetation to upstream river flow in the Heihe Rive basin by time series analysis of MODIS data

Simulation of Water Use Dynamics by Salix Bush in a Semiarid Shallow Groundwater Area of the Chinese Erdos Plateau

Assessing Green and Blue Water: Understanding Interactions and Making Balance between Human and Nature

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