Ecosystem water use efficiency in an irrigated cropland in the North China Plain

Tong, Xiaochong; Li, Jun; Yu, Qiang; Qin, Zhong

doi:10.1016/j.jhydrol.2009.06.030

Cited by 55 publications

(42 citation statements)

References 42 publications

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“…It then implies that saturated storage loss in the basin is somewhat counter-balanced by storage gain in especially root-zone soil moisture. This is because agricultural irrigation, which is almost exclusively dependent on groundwater pumping, augments root-zone soil moisture storage in the wheatmaize rotational cultivation system (also see Tong et al, 2009). …”

Section: Resultsmentioning

confidence: 99%

“…Based on GRACE data, the central plains are the worst storagedepletion zones in the basin. The storage pattern further suggests that GRACE responds more to regional storage change (also see Tapley et al, 2005;Swenson et al, 2006), hence GRACE data application in hydrological studies is for now limited to a minimum of ≈200 000 km 2 . For the soil moisture and groundwater storage, the plots on Fig.…”

Section: Seasonal Storage Changementioning

confidence: 98%

“…GRACE data are available for virtually all river basins and can be inverted for water storage change in the thin layer of the earth (Brunner et al, 2006;Swenson et al, 2006) with unprecedented accuracy (Tapley et al, 2005;Flamsteed, 2007). GRACE is promising because no global network exists of hydrological observations with temporal and spatial resolutions necessary to characterise storage on regional to continental scale Klees et al, 2006;Chen et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of GRACE with in situ hydrological measurement data shows storage depletion in Hai River basin, Northern China

Moiwo¹,

Yang²,

Li³

et al. 2009

WSA

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Water storage change has implications not only for the hydrological cycle, but also for sustainable water resource management in especially semi-arid river basins. Satellite/remote sensing techniques have gained increasing application in monitoring basin and regional hydrological processes in recent decades. In this study, the latest version of GRACE (Gravity Recovery and Climate Experiment) is used to estimate total water storage change in the Hai River basin (HRB) of Northern China for the period January 2003 to December 2006. Time-series comparisons show a good agreement between the estimated storage change from the GRACE satellite data and in situ hydrological measurement data at especially the seasonal cycle with R = 0.82 and RMSE = 17.25 mm. The good agreement suggests that GRACE detects storage change in the 318 866 km 2 HRB study area. It also implies that the in situ hydrological measurements of soil moisture and groundwater sufficiently characterise storage change in the semi-arid river basin. Change in soil moisture storage is less than that in saturated storage, suggesting that storage depletion in the basin is mainly in the saturated zone. Both the GRACE and hydrological measurement data indicate storage loss in the range of 12.72 to 23.76 mm/yr -a phenomenon that has been detected in previous studies in the basin. GRACE hydrology data could therefore be handy in monitoring storage dynamics and water availability in the study area. As GRACE data are available for virtually every region of the world, their application in conjunction with hydrological models could improve hydrological studies. This may lead not only to water balance closures, but also to sustainable water resource management at basin to regional scale.

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Section: Resultsmentioning

confidence: 99%

Section: Seasonal Storage Changementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Comparison of GRACE with in situ hydrological measurement data shows storage depletion in Hai River basin, Northern China

Moiwo¹,

Yang²,

Li³

et al. 2009

WSA

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“…Vegetation on Earth assimilates atmospheric CO 2 through photosynthesis, which is inherently accompanied with the loss of water that regulates the mass-energy exchange between the biosphere and the atmosphere (Field et al, 1995;Berry et al, 2010). Therefore, ecosystem WUE is relevant to the reasonable utilization of water resource and survival strategies, as well as responses to changing hydrological environment (Tong et al, 2009;Kharrou et al, 2011;Ito and Inatomi, 2012). Especially for agriculture, WUE is important for agronomy and irrigation management that represents an expected crop yield at the expense of water supply.…”

Section: Introductionmentioning

confidence: 99%

Characterizing ecosystem water-use efficiency of croplands with eddy covariance measurements and MODIS products

Tang

Ding

et al. 2015

Ecological Engineering

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a b s t r a c tHow to quantify the variability in ecosystem water use efficiency (WUE) of croplands is of vital importance. Especially in the context of changing hydrologic environment, much attention need to be paid on how to use limited water to improve crop yield. However, the biophysical performances of environmental/biological controls, crop types, and effects of diverse farming practices on WUE remain unclear. Therefore, this study aims to address these questions through tower-based measurements from eddy covariance and satellite-based estimates from MODIS GPP and ET products at the two annual soybean/corn rotation fields. The results exhibited that temperature and solar radiation are the most important meteorological factors. MODIS WUE estimates captured the broad trend of 8-day tower-based observations. However, ecosystem WUE was overpredicted at the seedling stage and after harvest, and was severely underestimated at the peak periods of maize, which was mainly ascribed to the uncertainties in MODIS GPP. Finally, we evaluated the effects of two farming practices (conventional vs alternative) on WUE and carbon sequence (NEE). On annual time scale, WUE of both soybean and maize are improved obviously under the alternative management whereas contrasting effects are observed on NEE. But the overall carbon balance for both treatments is nearly identical over 2-year rotation.

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“…In recent decades a large number of researchers have demonstrated that WUE also has a strong negative correlation with VPD on ecosystems (Law et al 2002;Scanlon and Albertson 2004;Ponton et al 2006;Song et al 2006;Zhao et al 2007;Kuglitsch et al 2008;Testi et al 2008;Tong et al 2009;Yang et al 2010). In the current study as VPD increased, WUE linearly decreased, with 36.3% of the variation in WUE explained by VPD (Fig.…”

Section: Effect Of Vpd On Wuementioning

confidence: 99%

Bamboo Forest Water Use Efficiency in the Yangtze River Delta Region, China

Wang¹,

Jiang²,

Chen³

et al. 2016

Terr. Atmos. Ocean. Sci.

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An eddy covariance technique was used to measure the gross primary productivity (GPP), evapotranspiration (ET), and water use efficiency (WUE) during the 2011 -2014 period over a moso bamboo forest at a site in Anji (AJ), China. WUE declined during the severe summer drought of 2013 when the vapor pressure deficit (VPD) was above 15 hPa, and was significantly higher than the average value. At AJ the average annual GPP, ET, and WUE were 1522 ± 73 C m -2 year -1 , 693 ± 41 kg H 2 O m -2 year -1 , and 2.21 ± 0.23 g C kg -1 H 2 O, respectively. GPP and ET were closely correlated at AJ, with R 2 equal to 0.64. The monthly GPP and ET showed strong positive linear, exponential or quadratic polynomial correlations to meteorological variables, including air temperature (Ta), net radiation (Rn), and VPD. WUE was negatively correlated to VPD, with 36.3% of the variation in WUE explained by VPD. This study contributes to the understanding of the carbon and water cycle response mechanisms in forest ecosystems in the climate change context and is significant in relation to forest carbon sequestration management.

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Ecosystem water use efficiency in an irrigated cropland in the North China Plain

Cited by 55 publications

References 42 publications

Comparison of GRACE with in situ hydrological measurement data shows storage depletion in Hai River basin, Northern China

Comparison of GRACE with in situ hydrological measurement data shows storage depletion in Hai River basin, Northern China

Characterizing ecosystem water-use efficiency of croplands with eddy covariance measurements and MODIS products

Bamboo Forest Water Use Efficiency in the Yangtze River Delta Region, China

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