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Agricultural Water Management
Elsevier
Agricultural Water Management

Elsevier

0378-3774

Agricultural Water Management/Journal Agricultural Water ManagementSCIISTPEI
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    Evapotranspiration estimates in a traditional irrigated area in semi-arid Mediterranean. Comparison of four remote sensing-based models

    Elfarkh J.Er-Raki S.Simonneaux V.Jarlan L....
    18页
    查看更多>>摘要：? 2022 Elsevier B.V.Quantification of actual crop evapotranspiration (ETa) over large areas is a critical issue to manage water resources, particularly in semi-arid regions. In this study, four models driven by high resolution remote sensing data were intercompared and evaluated over an heterogeneous and complex traditional irrigated area located in the piedmont of the High Atlas mountain, Morocco, during the 2017 and 2018 seasons: (1) SAtellite Monitoring of IRrigation (SAMIR) which is a software-based on the FAO-56 dual crop coefficient water balance model fed with Sentinel-2 high-resolution Normalized Difference Vegetation Index (NDVI) to derive the basal crop coefficient (Kcb); (2) Soil Plant Atmosphere and Remote Sensing Evapotranspiration (SPARSE) which is a surface energy balance model fed with land surface temperature (LST) derived from thermal data provided from Landsat 7 and 8; (3) a modified version of the Shuttleworth–Wallace (SW) model which uses the LST to compute surface resistances and (4) METRIC-GEE which is a version of METRIC model (“Mapping Evapotranspiration at high Resolution with Internalized Calibration”) that operates on the Google Earth Engine platform, also driven by LST. Actual evapotranspiration (ETa) measurements from two Eddy-Covariance (EC) systems and a Large Aperture Scintillometer (LAS) were used to evaluate the four models. One EC was used to calibrate SAMIR and SPARSE (EC1) which were validated using the second one (EC2), providing a Root Mean Square Error (RMSE) and a determination coefficient (R) of 0.53 mm/day (R=0.82) and 0.66 mm/day (R=0.74), respectively. SW and METRIC-GEE simulations were obtained respectively from a previous study and Google Earth Engine (GEE), therefore no calibration was performed in this study. The four models predict well the seasonal course of ETa during two successive growing seasons (2017 and 2018). However, their performances were contrasted and varied depending on the seasons, the water stress conditions and the vegetation development. By comparing the statistical results between the simulation and the measurements of ETa it has been shown that SAMIR and METRIC-GEE are the less scattered and the better in agreement with the LAS measurements (RMSE equal to 0.73 and 0.68 mm/day and R equal to 0.74 and 0.82, respectively). On the other hand, SPARSE is less scattered (RMSE = 0.90 mm/day, R = 0.54) than SW which is slightly better correlated (RMSE = 0.98 mm/day, R = 0.60) with the observations. This study contributes to explore the complementarities between these approaches in order to improve the evapotranspiration mapping monitored with high-resolution remote sensing data
      原文链接:
    • NSTL
    • Elsevier

    Avoiding the point of no return: Maintaining infiltration to remediate saline-sodic Vertosols in high rainfall environments

    Das B.T.Menzies N.W.McKenna B.A.Kopittke P.M....
    11页
    查看更多>>摘要：? 2022 Elsevier B.V.Saline-sodic soils are often too saline and alkaline for plant survival. These soils are prone to dispersing and eroding after high rainfall events when salinity is reduced before the sodicity. Cost-effective and water efficient methods are needed to leach salts while maintaining sufficient ionic strength of the soil solution. We tested the ability of gypsum, both alone and combined with elemental sulfur and organic matter to remediate the upper 15 cm of a strongly saline-sodic alkaline Vertosol when leached with deionised water in repacked columns. Prior to leaching, all amendment combinations reduced soil alkalinity by 80% and dispersion by 47% by displacing exchangeable sodium (Na). After leaching with 600 mm of deionised water, electrical conductivity of the soil solution (ECss) decreased from an average of 38–4.8 dS m?1 at 8 cm depth. Importantly, structure was maintained in all amended soils, despite this decrease in ECss. In contrast, for the control treatment, there was a concomitant loss of soil structural stability as ECss decreased. This decrease in stability also occurred in the subsoils of all treatments (which were not amended) because the applied calcium (Ca) precipitated before it could be leached to remediate the deeper layers. This study demonstrated that it was critical to first apply amendments as deep in the soil profile as possible to prevent the development of a non-saline sodic soil. Leaching the soil with low ionic strength water removed excess soluble salts from the plant root zone. We estimated that > 300 mm of water (rainfall or irrigation) was required to leach through the root zone to ensure a suitable soil profile for establishing of salt tolerant pioneer species such as Rhodes grass (Chloris gayana Kunth).
      原文链接:
    • NSTL
    • Elsevier

    Grain yield, actual evapotranspiration and water productivity responses of maize crop to deficit irrigation: A global meta-analysis

    Allakonon M.G.B.Zakari S.Tovihoudji P.G.Fatondji A.S....
    10页
    查看更多>>摘要：? 2022 Elsevier B.V.Deficit irrigation (DI) has been implemented in arid regions to improve water productivity while maintaining or increasing crop yield. In this study, we carried out a global scale meta-analysis to (1) quantify the response ratios of grain yield (GY), actual crop evapotranspiration (ETc act) and water productivity (WP) under DI stress. Then, we (2) examined the effects of nitrogen (N), phosphorus (P) and potassium (K) fertilizer rates, climate, soil texture, DI application mode, and maize growing cycle on GY, ETc act and WP. A total of 1192 observations retrieved from 167 studies were used to estimate the effect size and generate forest plots for each factor at three different growth stages. The response ratio (RR) of maize GY was higher for short-cycle varieties (RR, ?0.14), in semi-arid climates (RR, ?0.25) and under irrigation amount reduction (RR, ?0.21). Maize ETc act was higher for long and medium cycle varieties (RR, ?0.22), for medium-textured soils (RR, ?0.14) and drier climates. The WP improved by 9% on heavy soils compared to both light and medium soils, indicating that heavy soils are more suitable for growing maize under DI. This study highlights that high DI stress was often applied with low nitrogen rates to limit reciprocal effect on yield loss. The application of DI stress before the reproductive stage induced an adaptation strategy that limits maize yield loss and improves WP. Thus, the application of DI stress should start earlier at the vegetative stage to be more beneficial to maize. Furthermore, DI stress should target early-maturing maize varieties to achieve higher crop WP. The findings imply that DI stress could be a promising strategy for water management in maize cropping systems while considering appropriate soil, growing stages, varieties and climate.
      原文链接:
    • NSTL
    • Elsevier

    Analysis of the regional differences in agricultural water poverty in China: Based on a new agricultural water poverty index

    Song J.Shen J.Zhao Y.
    17页
    查看更多>>摘要：? 2022 Elsevier B.V.China's agricultural water resource utilization contradiction is prominent, and there are obvious differences in the distribution and utilization of water resources among regions. The theory of agricultural water poverty is of great significance to promote the efficient utilization of agricultural water resources and alleviate the contradiction of agricultural water use. However, the definition of the existing agricultural water poverty theory is quite controversial, and the mainstream agricultural water poverty index (AWPI) for measuring agricultural water poverty has disadvantages such as complex index selection and lack of unified weights. In this regard, this research takes the lead in providing a more complete definition of agricultural water poverty with reference to the definition of water poverty. In terms of method, the research refers to the Social Water Stress/Scarcity Index (SWSI) framework and proposes a new agricultural water poverty index from the two aspects of agricultural water scarcity and agricultural development capability. Based on this index, the regional differences in agricultural water poverty in China are analyzed. The main findings of the study: The agricultural water poverty index proposed in this study has rich connotations, is easy to compare objectively between regions and is applicable in the field of agriculture. The regional differences in agricultural water poverty in China are large, the number of areas with serious agricultural water poverty problems is large, and such problems last for a long time. The distribution of agricultural water poverty in China has spatial autocorrelation rather than a random distribution. China's relative agricultural water poverty index fluctuates around high values, the gap in agricultural water poverty between regions has not narrowed, and the contradiction in relative agricultural water poverty is prominent. The occurrence paths of agricultural water poverty in different regions are different, and the situation in different regions should be identified based on the scarcity of agricultural water resources and the development capability of agricultural production. Finally, this study expects to improve agricultural water poverty theory to effectively alleviate the problem of agricultural water poverty in different regions and promote balanced regional development.
      原文链接:
    • NSTL
    • Elsevier

    Optimization of winter irrigation management for salinized farmland using a coupled model of soil water flow and crop growth

    Liu Y.Zeng W.Ao C.Lei G....
    13页
    查看更多>>摘要：? 2022 Elsevier B.V.Drip irrigation under film mulch (DIUFM) and subsurface pipe drainage (SPD) are important measures to cope with water shortages and soil salinization in arid areas of northwest China. To investigate the coordinated operation mode of DIUFM and SPD, a new H2DSWAP model was developed based on coupling the HYDRUS-2D with a Soil–Water–Atmosphere–Plant model (SWAP). In the H2DSWAP model, real-time evapotranspiration, simple root growth, and the interaction between crops and soil water and salt are considered to improve the simulation accuracy. The model was calibrated and validated using parameter estimation and uncertainty analysis software (PEST) using field experiment datasets in 2019 and 2020 respectively. Compared with the original HYDRUS-2D model, the simulation accuracy of the H2DSWAP for soil water (root mean square error (RMSE) = 0.011 cm3·cm?3; mean absolute error (MAE) = 0.008 cm3·cm?3; determinant coefficient (R2) = 0.869) and soil salt (RMSE = 0.296 g·kg?1; MAE = 0.231 g·kg?1; R2 = 0.959) contents has been greatly improved. In addition, the simulation of the leaf area index (LAI) and yield also fitted well with field observations. The calibrated model was used to predict salt transport at depths of 0–100 cm and the change in maize yield under DIUFM. The results indicated that maize yield decreased yearly, and soil salinity increased yearly under DIUFM without SPD. Based on the obtained results, the management strategies of winter irrigation (WIR) under different drip irrigation water amounts, namely 600 mm (S1), 540 mm (S2), 480 mm (S3), and 420 mm (S4), were further investigated. Water productivity (WP) and yield were used as evaluation indices. The WIR was carried out every 4–5 years when the drip irrigation amount of the maize field was S1 and S2 was recommended. However, it was recommended to carry out WIR every 2 and 3 years under S3 and S4, respectively. Overall, the H2DSWAP model can be used as a useful tool to guide the operation mode of drip irrigation under mulch and subsurface pipe drainage in saline soils.
      原文链接:
    • NSTL
    • Elsevier

    Resilience of various innovative water management practices: The case of rice production in the Vietnamese Mekong Delta floodplains

    Binh N.T.Thuy Tien L.V.Thi Tang L.Dung T.D....
    13页
    查看更多>>摘要：? 2022 Elsevier B.V.The floodplains play an important role in agricultural development and rural livelihoods in the Vietnamese Mekong Delta. As an intensive rice production area of Vietnam, the floodplain has experienced significant changes in water management regime during the recent decades. Depending on specific locations and irrigation infrastructure investments, four main water management practices have been innovated, particularly a planting season of two crops per year (2C1Y), three crops per year (3C1Y), three years eight crops (3Y8C) and two years five crops (2Y5C). The 4R framework (Reform, Result, Resilience, and Return) was developed based on grounded theory approach for resilience assessment of various innovative water management practices. In terms of resilience, we found that each crop pattern involves pros and cons, and the intensive crop practices are less resilient systems, especially in social, environmental, and ecological aspects. The findings provide good lessons learned not only for Vietnam but also for the other rice-producing deltas implementing ecosystem resilience to adapt to global challenges such as flood, drought, and salinity intrusion.
      原文链接:
    • NSTL
    • Elsevier

    Effects of muddy water irrigation with different sediment particle sizes and sediment concentrations on soil microbial communities in the Yellow River Basin of China

    Chen L.Zhao Z.Li J.Wang H....
    11页
    查看更多>>摘要：? 2022Soil microbial communities are critically important for the transformation of nitrogen in agricultural farmlands. The effects of muddy water irrigation with different sediment particle sizes and sediment concentrations on microbial communities in the Yellow River Basin of China have not yet been studied. The 16 S rRNA profiles of bacterial communities in paddy soils were characterized using an orthogonal experiment with four moisture treatments (60%, 80%, and 100% water-filled pore space (WFPS), and drowned), four sediment particle sizes (d50 = 0.017, 0.038, 0.046, and 0.069 mm), and four sediment concentrations (0%, 1%, 5%, and 10%). Proteobacteria, Bacteroidetes, Gemmatimonadetes, Acidobacteria, Chlorobi, and Nitrospirae were the most abundant phyla, and Azospirillum, Limnobacter, Methylophaga, Ramlibacter, Mesorhizobium, Anaeromyxobacter, Geobacter, Candidatus_Solibacter, Gallionella, and Rubrivivax were the most abundant nitrogen-related genera across all treatments. Soil bulk density (SBD) was significantly correlated with Azospirillum, Limnobacter, Methylophaga, Geobacter, and Gallionella. Alpha diversity was highest in the treatment with 100% WFPS, 1% sediment concentration, and 0.069 mm particle size. pH, NH4+, and NO3- were most closely related to the relative abundance of nitrogen-related genera according to correlation analysis. Redundancy analysis (RDA) showed that SBD was the most important factor affecting soil microorganisms; however, NH4+ and NO3- also had substantial effects on soil microorganisms. Structural equation modeling revealed that SBD and pH were the most important factors affecting nitrogen transformation and the microbial community; however, NO3-, NH4+, and the nitrification rate also had significant effects. Overall, the results indicate that muddy water irrigation can be used to enhance the diversity of the soil microbial community. The findings will also aid future research examining the effects of moisture and sediment variables on soil microbial communities in the Yellow River Basin.
      原文链接:
    • NSTL
    • Elsevier

    Long-term saline water irrigation decreased soil organic carbon and inorganic carbon contents

    Dong X.Wang J.Zhang X.Liu X....
    7页
    查看更多>>摘要：? 2022 Elsevier B.V.Soil carbon is a key component of ecosystem functions and is crucial to global climate conservation and crop productivity. Saline water irrigation can maintain crop yield inmost world regions of freshwater shortage. However, saline water irrigation may also induce soil salt accumulation, which would result in the change of soil physical or chemical properties. Saline water irrigation's effect on soil organic carbon (SOC) and soil inorganic carbon (SIC) contents is of little concern. In this study, we irrigated soil with 1 g L?1, 4 g L?1 and 8 g L?1 saline water in a winter-wheat and summer-maize rotation system. After 14 years of irrigation, we sampled soils in a winter wheat and summer maize rotation system, and analyzed soil water, soil salt, SOC, and SIC contents. The results showed that, compared with 1 g L?1 water irrigation, 8 g L?1 saline water irrigation significantly increased soil water and salt contents. Moreover, 8 g L?1 saline water irrigation significantly decreased SOC and SIC contents in the 0–20 cm soil layer (p < 0.05) and mainly decreased SOC content in > 1 mm aggregates and wheat-derived SOC content in bulk soil. In comparison, 4 g L?1 saline water had no significant effect on soil water, soil salt, SOC, and SIC contents. These results indicated that a high concentration of saline water irrigation is harmful for soil carbon sequestration, while a low concentration of saline water did not affect soil carbon sequestration. Thus, using no more than 4 g L?1 saline water irrigation for 14 years can maintain soil carbon storage in the water shortage areas.
      原文链接:
    • NSTL
    • Elsevier