Root growth and soil water utilization of winter wheat in the North China Plain

Zhang, Xiying; Pei, Dong; Chen, Suying

doi:10.1002/hyp.5533

Cited by 173 publications

(111 citation statements)

References 26 publications

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“…Ishaq et al (2003) described that the higher RLD was obtained by deep tillage and that the RLD positively correlated with nutrient uptake and yield of grain and straw. Holloway and Dexter (1991) and Zhang et al (2004) also reported the enhancement of wheat root development into deep soil layer by deep tillage.…”

Section: Biomass Production and Yieldmentioning

confidence: 92%

Effects of Subsoiling to the Non-tilled Field of Wheat-Soybean Rotation on the Root System Development, Water Uptake, and Yield

Izumi

Yoshida

Iijima

2009

Plant Production Science

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Section: Biomass Production and Yieldmentioning

confidence: 92%

Effects of Subsoiling to the Non-tilled Field of Wheat-Soybean Rotation on the Root System Development, Water Uptake, and Yield

Izumi

Yoshida

Iijima

2009

Plant Production Science

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“…In this case, the accuracy of estimated rooting depth directly influences the precision of estimates of soil moisture in the two layers. In our study, the development of crop rooting depth was estimated based on observation results in one year (Zhang, 1999). However, the real maximum rooting depth in different years might be different due to meteorological conditions and irrigation application, as discussed above.…”

Section: Strong and Weak Points Of The Current Swb Modelmentioning

confidence: 99%

“…Daily precipitation rates were measured by summing up hourly tipping-bucket measurements. The rooting depths of winter wheat and maize were reported by Zhang (1999) as a function of the number of days since planting.…”

Section: Experimental Datamentioning

confidence: 99%

Estimation of soil water content and evapotranspiration from irrigated cropland on the North China Plain

Jiang

Zhang

Wegehenkel

et al. 2008

Z. Pflanzenernähr. Bodenk.

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For nearly 30 y, cropland on the North China Plain (NCP) has been irrigated primarily by pumping groundwater with no sustainable management strategy. This has caused a continuous decline of the water table. A sustainable groundwater management and irrigation strategy must be established in order to prevent further decline of the water table; to do this, one must quantify soil water content and daily rates of deep percolation and locate evapotranspiration from irrigated cropland. For that purpose, we developed a three-layer soil-water balance (SWB) model based on an approach described by Kendy et al. (2003). In this model, the unsaturated soil zone is divided into three layers: a surface active layer, a middle active soil layer, and a lowest passive soil layer. The middle and the lowest layers dynamically change with the development of crop rooting depth. A simple "tipping bucket" routine and an exponential equation are used to redistribute soil water in the three soil layers. The actual evapotranspiration estimated is partitioned into soil evaporation and crop transpiration using a dual crop coefficient reference approach. At first, the model was calibrated using data obtained from five deficiently irrigated field plots located at an experimental site in the NCP between 1998 and 2003. Then, the model was validated by comparing estimated soil water contents with measured ones at three other plots with nondeficient irrigation. The estimates of actual evapotranspiration were compared with those measured with a large-scale weighing lysimeter (3 m 2 ). The index of agreement (IA) for soil water contents varied between 0.62 and 0.80; the concordance correlation coefficient (CCC) and the root mean square error obtained from the same comparison were 0.34-0.65 and 0.043-0.074 cm 3 cm -3 , respectively. The rates of 10 d mean evapotranspiration estimated by the model show a good fit to those measured by the large-scale lysimeter; this is indicated by IA = 0.94 and CCC = 0.88. Our results indicate that at the irrigated cropland on the plain, deep soil water-percolation rates are usually <200 mm y -1 under nondeficient-irrigation conditions.

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“…Class A pan evaporation was measured daily. Root depths of winter wheat and maize were reported by Zhang (1999) as a function of the number of days since planting. Leaf-area index was measured by Zhang et al (2002) and Wang et al (2001).…”

Section: Field Site Descriptionmentioning

confidence: 99%

A soil‐water‐balance approach to quantify groundwater recharge from irrigated cropland in the North China Plain

Kendy¹,

Gerard-Marchant²,

Walter³

et al. 2003

Hydrological Processes

239

201

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Abstract:Rapidly depleting unconfined aquifers are the primary source of water for irrigation on the North China Plain. Yet, despite its critical importance, groundwater recharge to the Plain remains an enigma. We introduce a one-dimensional soil-water-balance model to estimate precipitation-and irrigation-generated areal recharge from commonly available crop and soil characteristics and climate data. To limit input data needs and to simplify calculations, the model assumes that water flows vertically downward under a unit gradient; infiltration and evapotranspiration are separate, sequential processes; evapotranspiration is allocated to evaporation and transpiration as a function of leaf-area index and is limited by soil-moisture content; and evaporation and transpiration are distributed through the soil profile as exponential functions of soil and root depth, respectively. For calibration, model-calculated water contents of 11 soildepth intervals from 0 to 200 cm were compared with measured water contents of loam soil at four sites in Luancheng County, Hebei Province, over 3 years (1998)(1999)(2000)(2001). Each 50-m 2 site was identically cropped with winter wheat and summer maize, but received a different irrigation treatment. Average root mean-squared error between measured and model-calculated water content of the top 180 cm was 4Ð2 cm, or 9Ð3% of average total water content. In addition, model-calculated evapotranspiration compared well with that measured by a large-scale lysimeter. To test the model, 12 additional sites were simulated successfully. Model results demonstrate that drainage from the soil profile is not a constant fraction of precipitation and irrigation inputs, but rather the fraction increases as the inputs increase. Because this drainage recharges the underlying aquifer, improving irrigation efficiency by reducing seepage will not reverse water-table declines.

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Root growth and soil water utilization of winter wheat in the North China Plain

Cited by 173 publications

References 26 publications

Effects of Subsoiling to the Non-tilled Field of Wheat-Soybean Rotation on the Root System Development, Water Uptake, and Yield

Effects of Subsoiling to the Non-tilled Field of Wheat-Soybean Rotation on the Root System Development, Water Uptake, and Yield

Estimation of soil water content and evapotranspiration from irrigated cropland on the North China Plain

A soil‐water‐balance approach to quantify groundwater recharge from irrigated cropland in the North China Plain

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