Stable oxygen isotope analysis of the water uptake mechanism via the roots in spring maize under the ridge–furrow rainwater harvesting system in a semi-arid region

Xu, Jing; Guo, Ziyan; Li, Zhimin; Li, Fangjian; Xue, Xuanke; Wu, Xiaorong; Zhang, Xuemei; Li, Hui; Zhang, Xudong; Han, Qingfang

doi:10.1016/j.agwat.2021.106879

Cited by 22 publications

(4 citation statements)

References 46 publications

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“…In the six-leaf stage (V6), tasseling stage (VT), and grain-milking stage (R3) of summer maize, three representative plants were selected from each plot, and the roots were excavated by profile method ( Supplementary Figure 2 ). According to Xu et al (2021) , the excavated roots were carefully cleaned. Then, a scanner (Epson V700, Indonesia) was used to obtain the root image file.…”

Section: Methodsmentioning

confidence: 99%

Suitable Fertilizer Application Depth Enhances the Efficient Utilization of Key Resources and Improves Crop Productivity in Rainfed Farmland on the Loess Plateau, China

Chen

Cai²,

Wang³

et al. 2022

Front. Plant Sci.

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Appropriate fertilizer application methods can help to improve crop yields. However, limited information is available regarding how different fertilizer application depths might affect crop production in dryland winter wheat-summer maize cropping in the Loess Plateau region of China. Therefore, we conducted field experiments in 2019–2020 and 2020–2021 to evaluate the effects of changing the fertilizer placement depth on summer maize (current crop) and winter wheat (succeeding crop) productivity, as well as the resource use efficiency and soil nitrate-nitrogen residue (SNR) level. Four fertilizer placement depths were tested comprising 5 cm (FD5), 15 cm (FD15), 25 cm (FD25), and 35 cm (FD35). The nitrogen uptake by summer maize in the two seasons was 10.0, 6.5, and 11.8% higher under FD15 compared with those under FD5, FD25, and FD35, respectively, because FD15 effectively increased the root length density, root surface area density, and rate of root bleeding sap. Due to the increased nitrogen uptake, the leaf area index, plant height, stem diameter, and accumulated dry matter were improved in summer maize. The interception of photosynthetically active radiation was 3.6, 3.7, and 5.9% higher under FD15 compared with those under FD5, FD25, and FD35, respectively. The summer maize grain yield increased by 13.9–22.4% under FD15 compared with the other treatments. In addition, the SNR in the deep soil (200–300 cm) was significantly lower under FD15 during the summer maize harvest (17.9–30.7%) compared with the other treatments. Moreover, FD15 increased the winter wheat (succeeding crop) grain yield (2.6–11.2%) and reduced the SNR in the 200–300 cm soil layer (8.8–16.8%) at the winter wheat harvest. The highest radiation use efficiency, precipitation use efficiency, and nitrogen use efficiency were obtained under FD15 in both summer maize and winter wheat. These results clearly suggest that depth fertilization of 15 cm enhanced the productivity and resource use efficiency for the current and subsequent crops in rainfed farmland in the Loess Plateau of China, as well as reducing the SNR in the deep soil to promote sustainable agricultural development. These findings provide a practical reference for optimizing fertilizer application management.

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Section: Methodsmentioning

confidence: 99%

Suitable Fertilizer Application Depth Enhances the Efficient Utilization of Key Resources and Improves Crop Productivity in Rainfed Farmland on the Loess Plateau, China

Chen

Cai²,

Wang³

et al. 2022

Front. Plant Sci.

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“…5. subsoil layers hence increases linearly with root length (Ma and Song, 2016;Xu et al, 2021). In the topsoil, roots are densely distributed and compete for water.…”

Section: Figmentioning

confidence: 99%

Root Phenotyping and Root Water Uptake Calculation Using Soil Water Contents Measured in a Winter Wheat Field

Huang

Zhang

Ashton

et al. 2023

Preprint

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“…In semi‐arid regions, water stable isotopes have been used successfully as environmental tracers for studying fluxes such as infiltration (e.g., Allison & Hughes, 1983; Dincer et al, 1974) and groundwater recharge (e.g., Boumaiza et al, 2021; Faye et al, 2019; Gaj et al, 2016; Koeniger et al, 2016; Scanlon et al, 2006). These isotopes have also been used to investigate evapotranspiration (e.g., Barnes & Allison, 1988; Dubbert et al, 2013; Skrzypek et al, 2015; Wang et al, 2012); uptake of water by plant roots (e.g., Dawson & Ehleringer, 1991; Xu et al, 2021; Yang et al, 2010); and hydraulic redistribution (e.g., Caldwell et al, 1998; Dawson, 1993; Oerter et al, 2021; Priyadarshini et al, 2016). Some authors have used water stable isotopes to study flow pathways and mixing in the unsaturated zone (e.g., Mueller et al, 2014; Stumpp & Maloszewski, 2010; Windhorst et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimating water fluxes in the critical zone using water stable isotope approaches in the Groundnut and Ferlo basins of Senegal

Diongue

Stumpp

Roupsard

et al. 2023

Hydrological Processes

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Sustainable water management in semi-arid agriculture practices requires quantitative knowledge of water fluxes within the soil-vegetation-atmosphere system. Therefore, we used stable-isotope approaches to evaluate evaporation (E a ), transpiration (T a ), and groundwater recharge (R) at sites in Senegal's Groundnut basin and Ferlo Valley pasture region during the pre-monsoon, monsoon, and post-monsoon seasons of 2021. The approaches were based upon (i) the isothermal evaporation model (for quantifying E a ); (ii) water and isotope mass balances (to partition E a and T a for groundnut and pasture); and (iii) the piston displacement method (for estimating R). E a losses derived from the isothermal evaporation model corresponded primarily to Stage II evaporation, and ranged from 0.02 to 0.09 mm d À1 in the Groundnut basin, versus 0.02-0.11 mm d À1 in Ferlo. At the groundnut site, E a rates ranged from 0.01 to 0.69 mm d À1 ; T a was in the range 0.55-2.29 mm d À1 ; and the T a /ET a ratio was 74%-90%. At the pasture site, the ranges were 0.02-0.39 mm d À1 for E a ; 0.9-1.69 mm d À1 for T a ; and 62-90% for T a /ET a . The ET a value derived for the groundnut site via the isotope approach was similar to those from eddy covariance measurements, and also to the results from the previous validated HYDRUS-1D model. However, the HYDRUS-1D model gave a lower T a /ET a ratio (23.2%). The computed groundwater recharge for the groundnut site amounted to less than 2% of the local annual precipitation. Recommendations are made regarding protocols for preventing changes to isotopic compositions of water in samples that are collected in remote arid regions, but must be analysed days later. The article ends with suggestions for studies to follow up on evidence that local aquifers are being recharged via preferential pathways.

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Stable oxygen isotope analysis of the water uptake mechanism via the roots in spring maize under the ridge–furrow rainwater harvesting system in a semi-arid region

Cited by 22 publications

References 46 publications

Suitable Fertilizer Application Depth Enhances the Efficient Utilization of Key Resources and Improves Crop Productivity in Rainfed Farmland on the Loess Plateau, China

Suitable Fertilizer Application Depth Enhances the Efficient Utilization of Key Resources and Improves Crop Productivity in Rainfed Farmland on the Loess Plateau, China

Root Phenotyping and Root Water Uptake Calculation Using Soil Water Contents Measured in a Winter Wheat Field

Estimating water fluxes in the critical zone using water stable isotope approaches in the Groundnut and Ferlo basins of Senegal

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