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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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    Simulating the effect of subsurface tile drainage on watershed salinity using SWAT

    Addab H.Bailey R.T.
    10页
    查看更多>>摘要：? 2021 Elsevier B.V.Subsurface tile drains in areas with intensive agriculture can be a major contributor of salinity loadings to streams and rivers, as salts in soil and groundwater are transported into the tile drains. Modeling tools can be used to assess baseline conditions, quantify salt mass export, and assess management scenarios to decrease salt removal. In this study, a newly developed version of the SWAT model for salinity transport, SWAT-Salt, was modified to include salt ion transport in subsurface tile drains and used to explore the effects of region-wide implementation of subsurface drainage on salinity transport and export from an irrigated semi-arid watershed. The model includes the transport of 8 major salt ions (SO4, Ca, Na, Cl, Mg, K, CO3, HCO3), and with the inclusion of tile drain transport simulates the fate and reactive transport of these ions in soil water, groundwater, tile drain water, and stream water. The SWAT-Salt model is applied to a 732 km2 salinity-impaired irrigation region within the Arkansas River Valley in southeastern Colorado. The model is first tested against salt ion data in effluent from a 15 km2 tile drainage district, and then applied to the entire region to assess the impact of region-wide implementation of subsurface tile drainage on in-stream salt ion concentrations, in-stream salt ion loading, and total salt export from the watershed. The model can be a useful tool in simulating salinity transport in tile drained watershed and investigating the effect of salinity management practices at a variety of spatial and temporal scales.
      原文链接:
    • NSTL
    • Elsevier

    What is the past, present, and future of scientific research on the Yellow River Basin? —A bibliometric analysis

    He Z.Gong K.Zhang Z.Dong W....
    11页
    查看更多>>摘要：? 2021 Elsevier B.V.China's Yellow River Basin (YRB) has large watershed but scarce water resources. More importantly, most parts of the YRB are located in semi-arid areas of Northwest China, where the ecology and environments are fragile. So, ecological restoration and agricultural production always are the key research topics of the YRB. However, the specific research interest of YRB changed over time and was always closely related to the implementation of government policies. Hence, we conducted a comprehensive analysis of YRB's research topics based on the methods of bibliometrics. The results showed that the number of papers about YRB's research experienced a change from slowly increasing (1998–2010, 83 papers) to rapidly increasing (2011–2015, 128 papers), and then to exponentially rising (2016–2020, 369 papers). Secondly, the main research fields of the YRB included farming, crops, water, soil, environment, and etc. The journal of Agriculture Water Management had the highest global total citations and H-index, even local cited references were the highest among all of the reference papers about the YRB. Through summarizing the most cited papers and references, we found the most important research hotspots about the YRB were: the impacts of climate change and human activities on the amount of sediment in the YRB, the management of soil erosion and vegetation restoration in the YRB, and the relationship between crops and environment and management in the Loess Plateau of China. In addition, “Loess Plateau” was the most frequent keyword in the past ten years and the popularity of “climate change” rose sharply in the past five years. For YRB's research in near future, how to effectively control carbon emissions, greenhouse gas (GHG) emissions, and carbon surplus is becoming an important implication for YRB's agricultural production and ecological restoration in the future. In general, this research is expected to promote a comprehensive and quantitative understanding of the past, present and future of YRB's research.
      原文链接:
    • NSTL
    • Elsevier

    Plastic film mulching increases yield, water productivity, and net income of rain-fed winter wheat compared with no mulching in semiarid Northwest China

    Chai Y.Chai Q.Li R.Li Y....
    12页
    查看更多>>摘要：? 2021 Elsevier B.V.Whole-ground plastic film mulching with thin soil mulching above the film (PMS) and no mulching (NM) are the two dominant planting patterns for winter wheat in the semiarid rain-fed region (mean annual precipitation <450 mm) of Northwest China. In this study, differences in water consumption and production performance between PMS and NM were analyzed, as well as reasons for differences in wheat yield, in 24 field experiments conducted from 2008 to 2019 at three sites. Compared with NM, PMS had higher average grain yield (23.2%), crop water productivity based on grain yield (25.6%), and net income (603 ￥ ha?1) across all 24 experiments. In PMS, yield stability also improved under different environments. Yield differences between planting patterns and among environments primarily depended on differences in spike number ha?1. Average consumption of pre-sowing stored water in soil from 0 to 200 cm in PMS and NM accounted for 38% and 35%, respectively, of total evapotranspiration (ET). In early (sowing–jointing), middle (jointing–flowering), and late (flowering–maturity) phases, average water consumption in PMS was 36.4%, 39.3%, and 24.3%, respectively. In the middle phase, PMS increased water consumption by 29 mm and the proportion of water consumption relative to total ET by 5.6% compared with NM. In early and late phases, water consumption was similar in PMS and NM. Increased water consumption in the middle phase could increase vegetative growth and sink capacity (grain yield ha?1). ET, yield, and vegetative growth were highly positively correlated with one another. Compared with NM, PMS significantly increased yield and crop water productivity by maximizing transpiration, increasing water consumption in the middle phase, and improving use of pre-sowing stored water. In conclusion, PMS is suitable to cultivate wheat for improving water productivity and economic benefits in the semiarid rain-fed agricultural region of Northwest China.
      原文链接:
    • NSTL
    • Elsevier

    The effect of mulched ridge and furrow micro catchment water harvesting on red pepper yield and quality features in Bafra Plain of Northern Turkey

    Yildirim D.Cemek B.Unlukara A.
    13页
    查看更多>>摘要：? 2021 Elsevier B.V.For two decades, promising results have been obtained by ridge-furrow rainwater harvesting systems (RWHS) to feed the increasing world population and cope with water scarcity and drought in semiarid and arid areas. A two-year study in Turkey's semi-humid Black Sea Region was conducted to examine RWHS's effects on harvested water, soil water content, red pepper growth, yield, quality attributes, water consumption, and crop water productivity (WPc), crop water stress index (CWSI). The profitability of the system was examined by economic analysis. For these purposes, three different polyethylene-covered ridge widths (RWHS1: 100 cm, RWHS2: 120 cm, and RWHS3: 140 cm) were considered. To allow the harvested water infiltration root zone and grow red pepper, 80 cm width furrow areas with double plant rows were left between the covered ridges on contours. To compare the RWHS treatments, three conventional rainfed farming or dry farming treatments (DFS1, DFS2, and DFS3) with 90 cm, 100 cm, and 110 cm plant row distances were considered. Each treatment was replicated three times in the randomized block design experiment. Besides, a multiple regression model was developed to estimate the runoff from the plastic-covered ridges by using independent parameters such as covered ridge ratios and rainfall amounts (R2 = 0.97). The red pepper consumed between 165 and 174 mm water in 2017 and 118–147 mm in 2018. Maximum red pepper yields, which increased by 68% in 2017 and 149% in 2018, were derived from RWHS1 as 33.2 and 27.19 t ha?1, respectively. As plastic-covered ridge width increased, red pepper yield decreased because of lowering plant density. RWHS improved red pepper yield and significantly increased leaf area, plant height, fruit length, and diameter. RWHS produced Turkey's highest red pepper WPc ratios, and RWHS1 improved WPc by 74% in 2017 and 169% in 2018. Although the red pepper consumed nearly the same amount of water under whole treatments, CWSI was lower under RWHS treatments. It was determined that sustainable red pepper farming according to the net income values under rainfed farmland in the region would not be possible without using rainwater harvesting systems such as RWHS1.
      原文链接:
    • NSTL
    • Elsevier