Evapotranspiration over the Grassland Field in the Liudaogou Basin of the Loess Plateau, China

Kimura, Reiji; Fan, Jun; Zhang, Xingchang; Takayama, Nobuki; Kamichika, Makio; Matsuoka, Norimasa

doi:10.1016/j.actao.2005.07.003

Cited by 43 publications

(31 citation statements)

References 13 publications

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“…Therefore, our estimates of E are very likely not underestimated but we cannot exclude on overestimation of E by our approach. Comparing our data with results from similar studies, the water loss by E on rainfed soil columns of 75% of the total water loss are in the upper range of values reported by Le Houérou (1984) and Kimura et al (2006). The possible overestimation of E by 20% (in the graph indicated by a change of −20%) would result in δ 13 C-values of the abscissa of intersection approaching −30 δ ‰, a value considered to represent the numerically lower limit of realistic values.…”

Section: N and Water Effects On Anppsupporting

confidence: 80%

Effects of N and water supply on water use-efficiency of a semiarid grassland in Inner Mongolia

et al. 2009

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Productivity of semiarid grasslands is primarily limited by seasonal rainfall amount and becomes increasingly limited by nutrient availability under wet conditions. Interactive effects of water and N availability on grassland productivity and parameters related to water use were studied on a grassland site in Inner Mongolia, China, in a 2-factorial experiment with two levels of water (rainfed: 158 mm; irrigated: 839 (N0) and 972 (N1) mm) and N supply (0 or 180 kg N ha −1 ). RUE was calculated from ANPP and cumulative water supply. Bare soil evaporation (E) was calculated from climatic data and leaf area dynamics, and percolation (D) and transpiration (T) were estimated with HYDRUS-1D. Water-use efficiency (WUE, ANPP / (T + D)) and transpiration efficiency (TE, ANPP / T) were calculated. Resource availability had pronounced effects on the water-use efficiency of semiarid grassland. RUE, WUE, and TE all decreased under irrigated compared to rainfed conditions and were significantly increased with N fertilizer application at both levels of water supply. While the irrigation effect on parameters of water-use efficiency were accordingly reflected in stable carbon isotope signatures, N supply resulted in significantly less negative δ 13 C-values under rainfed but not irrigated conditions. It is concluded, that spatial or temporal gradients in resource availability have pronounced effects on the water-use efficiency of semiarid grassland. The decrease of water use-efficiency under high water supply was related to differences in TE and not to a relative increase of unproductive water loss. Carbon isotope discrimination was highly correlated with WUE and TE, but can be a poor predictor of RUE.

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Section: N and Water Effects On Anppsupporting

confidence: 80%

Effects of N and water supply on water use-efficiency of a semiarid grassland in Inner Mongolia

et al. 2009

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“…However, only preliminary studies on the land-surface moisture processes and water balance of the semi-arid Loess Plateau have been conducted (Kimura et al 2006;Xie et al 2006;Kimura et al 2007). Most studies have focused on understanding the variation in soil moisture and land-surface evapotranspiration (Jacobs 1994;Jacobs and Verhoef 1997;Mohamed et al 2004;Zhu et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Dew Formation and Distribution, and Its Contribution to the Surface Water Budget in a Semi-arid Region in China

Qiang

Wang²,

Yang³

et al. 2014

Boundary-Layer Meteorol

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Observations in the semi-arid Loess Plateau area of north-west China are utilized to reveal the characteristics and variations in the seasonal distribution of dewfall (frost) and the influence of micrometeorology, precipitation, and other weather conditions. Precipitation is the dominant water source in the Loess Plateau; however, non-rainfall water accounts for 13 % of the total land-surface water source. Dew is the second largest non-rainfall component next only to soil adsorption water. Observations show that dew (frost) occurrence is likely to occur when an inversion occurs between the heights of 1 and 4 m with a temperature difference of 0.25 K, surface wind speed of 1.5 m s −1 , and surface relative humidity greater than 80 %.

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“…2. The details of the study site and weather measurements have been reported by Kimura et al (2006) and Kimura (2007). The study site is located in a semi-arid region, having an annual temperature of 8.4 • C and where annual precipitation is 437 mm.…”

Section: Test Site and Analysis Methodsmentioning

confidence: 99%

“…Most of the precipitation occurs during the period of July to September (Kimura et al, 2004;Yamanaka, 2008). Soil erosion is a major issue in the region (Kimura et al, 2006;Yamanaka, 2008), and vegetation cover is a primary factor of soil erosion (Hupy, 2004). Several studies have been conducted to prevent erosion by controlling vegetation coverage in this region Zhou et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Estimation of volumetric soil water content over the Liudaogou river basin of the Loess Plateau using the SWEST method with spatial and temporal variability

Tasumi

Kimura

2013

Agricultural Water Management

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Evapotranspiration over the Grassland Field in the Liudaogou Basin of the Loess Plateau, China

Cited by 43 publications

References 13 publications

Effects of N and water supply on water use-efficiency of a semiarid grassland in Inner Mongolia

Effects of N and water supply on water use-efficiency of a semiarid grassland in Inner Mongolia

Characteristics of Dew Formation and Distribution, and Its Contribution to the Surface Water Budget in a Semi-arid Region in China

Estimation of volumetric soil water content over the Liudaogou river basin of the Loess Plateau using the SWEST method with spatial and temporal variability

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