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Michael G Sunde, Hong S He, Jason A Hubbart, Michael A Urban
Future urban development and climatic changes are likely to affect hydrologic regimes in many watersheds. Quantifying potential water regime changes caused by these stressors is therefore crucial for enabling decision makers to develop viable environmental management strategies. This study presents an approach that integrates mid-21st century impervious surface growth estimates derived from the Imperviousness Change Analysis Tool with downscaled climate model projections and a hydrologic model Soil and Water Assessment Tool to characterize potential water regime changes in a mixed-use watershed in central Missouri, USA...
May 16, 2018: Journal of Environmental Management
John N Christensen, Baptiste Dafflon, Alyssa E Shiel, Tetsu K Tokunaga, Jiamin Wan, Boris Faybishenko, Wenming Dong, Kenneth H Williams, Chad Hobson, Shaun T Brown, Susan S Hubbard
Recharge of alluvial aquifers is a key component in understanding the interaction between floodplain vadose zone biogeochemistry and groundwater quality. The Rifle Site (a former U-mill tailings site) adjacent to the Colorado River is a well-established field laboratory that has been used for over a decade for the study of biogeochemical processes in the vadose zone and aquifer. This site is considered an exemplar of both a riparian floodplain in a semiarid region and a post-remediation U-tailings site. In this paper we present Sr isotopic data for groundwater and vadose zone porewater samples collected in May and July 2013 to build a mixing model for the fractional contribution of vadose zone porewater (i...
May 11, 2018: Science of the Total Environment
Mana Gharun, Malcolm Possell, R Willem Vervoort, Mark A Adams, Tina L Bell
Empirical evidence from Australia shows that fuel reduction burning significantly reduces the incidence and extent of unplanned fires. However, the integration of environmental values into fire management operations is not yet well-defined and requires further research and development. WAVES, a plant growth model that incorporates Soil-Vegetation-Atmosphere Transfer, was used to simulate the hydrological and ecological effects of three fuel management scenarios on a forest ecosystem. WAVES was applied using inputs from a set of forest plots for one year after three potential scenarios: (1) all litter removed, (2) all litter and 50% of the understorey removed, (3) all litter and understorey removed...
February 15, 2018: Science of the Total Environment
Pradeep Wagle, Prasanna H Gowda, Jerry E Moorhead, Gary W Marek, David K Brauer
Net ecosystem exchange (NEE) of carbon dioxide (CO2 ) and water vapor (H2 O) fluxes from irrigated grain sorghum (Sorghum bicolor L. Moench) and maize (Zea mays L.) fields in the Texas High Plains were quantified using the eddy covariance (EC) technique during 2014-2016 growing seasons and examined in terms of relevant controlling climatic variables. Eddy covariance measured evapotranspiration (ETEC ) was also compared against lysimeter measured ET (ETLys ). Daily peak (7-day averages) NEE reached approximately -12 g C m-2 for sorghum and -14...
May 8, 2018: Science of the Total Environment
Yue Li, Shilong Piao, Laurent Z X Li, Anping Chen, Xuhui Wang, Philippe Ciais, Ling Huang, Xu Lian, Shushi Peng, Zhenzhong Zeng, Kai Wang, Liming Zhou
China has experienced substantial changes in vegetation cover, with a 10% increase in the leaf area index and an ~41.5 million-hectare increase in forest area since the 1980s. Earlier studies have suggested that increases in leaf area and tree cover have led to a decline in soil moisture and runoff due to increased evapotranspiration (ET), especially in dry regions of China. However, those studies often ignored precipitation responses to vegetation increases, which could offset some of the negative impact on soil moisture by increased ET...
May 2018: Science Advances
Juan Wang, Jian Lin Wang, Jia Bin Liu, Wen Jiang, Chang Xing Zhao
The dynamic variations of evapotranspiration (ET) and weather data during summer maize growing season in 2013-2015 were monitored with eddy covariance system, and the applicability of two operational models (FAO-PM model and KP-PM model) based on the Penman-Monteith model were analyzed. Firstly, the key parameters in the two models were calibrated with the measured data in 2013 and 2014; secondly, the daily ET in 2015 calculated by the FAO-PM model and KP-PM model was compared to the observed ET, respectively...
June 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Xiao Wu Xu, Xin Xiao Yu, Guo Dong Jia, Han Zhi Li, Wei Wei Lu, Zi Qiang Liu
Soil-vegetation-atmosphere continuum (SPAC) is one of the important research objects in the field of terrestrial hydrology, ecology and global change. The process of water and carbon cycling, and their coupling mechanism are frontier issues. With characteristics of tracing, integration and indication, stable isotope techniques contribute to the estimation of the relationship between carbon sequestration and water consumption in ecosystems. In this review, based on a brief introduction of stable isotope principles and techniques, the applications of stable isotope techniques to water and carbon exchange in SPAC using optical stable isotope techniques were mainly explained, including: partitioning of net carbon exchange into photosynthesis and respiration; partitioning of evapotranspiration into transpiration and evaporation; coupling of water and carbon cycle at the ecosystem scale...
July 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Wei Wei Lu, Xin Xiao Yu, Guo Dong Jia, Han Zhi Li, Zi Qiang Liu
Water use efficiency (WUE) is different among species and regions. Few literatures have been reviewed related to long-term WUE of Platycladus orientalis in mountainous areas of Beijing, China. Tree-ring δ13 C of P. orientalis was used to determine the long-term variation of annual intrinsic water use efficiency (WUEi ) and its response to environmental change. Combining with quantification of tree-ring width, the relationship between net carbon sequestration and WUEi of P. orientalis was eventually explored...
July 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Jingyuan Xue, Zailin Huo, Fengxin Wang, Shaozhong Kang, Guanhua Huang
Water scarcity and salt stress are two main limitations for agricultural production. Groundwater evapotranspiration (ETg ) with upward salt movement plays an important role in crop water use and water productivity in arid regions, and it can compensate the impact of deficit irrigation on crop production. Thus, comprehensive impacts of shallow groundwater and deficit irrigation on crop water use results in an improvement of irrigation water productivity (IWP). However, it is difficult to quantify the effects of groundwater and deficit irrigation on IWP...
April 1, 2018: Science of the Total Environment
Getahun Legesse, Marcos R C Cordeiro, Kim H Ominski, Karen A Beauchemin, Roland Kroebel, Emma J McGeough, Sarah Pogue, Tim A McAllister
The amount of beef produced per animal in Canada increased significantly from 1981 to 2011, due to enhanced production efficiency and increased carcass weight. This study examined the impact of improvements in production efficiency on water use intensity over this period. Temporal and regional differences in cattle categories, water use for drinking, feed production and meat processing, feeding systems, average daily gains, and carcass weight were considered in the analysis. Potential evapotranspiration (PET) was estimated by the National Drought Model (NDM) from 679 weather stations across Canada using the Priestley and Taylor equation...
April 1, 2018: Science of the Total Environment
Chukwuemeka Ajaero, Kerry M Peru, Monique Simair, Vanessa Friesen, Gwen O'Sullivan, Sarah A Hughes, Dena W McMartin, John V Headley
Large volumes of oil sands process-affected water (OSPW) are generated during the extraction of bitumen from oil sands in the Athabasca region of northeastern Alberta, Canada. As part of the development of treatment technologies, molecular characterization of naphthenic acids (NAs) and naphthenic acid fraction compounds (NAFC) in wetlands is a topic of research to better understand their fate and behavior in aquatic environments. Reported here is the application of high-resolution negative-ion electrospray Orbitrap-mass spectrometry for molecular characterization of NAs and NAFCs in a non-aerated constructed treatment wetland...
August 1, 2018: Science of the Total Environment
A Mentzafou, S Wagner, E Dimitriou
Identifying the historical hydrometeorological trends in a river basin is necessary for understanding the dominant interactions between climate, human activities and local hydromorphological conditions. Estimating the hydrological reference conditions in a river is also crucial for estimating accurately the impacts from human water related activities and design appropriate water management schemes. In this effort, the output of a regional past climate model was used, covering the period from 1660 to 1990, in combination with a dynamic, spatially distributed, hydrologic model to estimate the past and recent trends in the main hydrologic parameters such as overland flow, water storages and evapotranspiration, in a Mediterranean river basin...
April 29, 2018: Science of the Total Environment
Yunqi Wang, Yinghua Zhang, Shunli Zhou, Zhimin Wang
No-tillage (NT) is a popular agricultural technique worldwide, but it remains unclear how NT affects the yield, evapotranspiration (ET), and water use efficiency (WUE) of maize and wheat. We performed a meta-analysis of the NT effects on the yield, ET and WUE for wheat and maize based on the literatures published during 1950-2018. Yield, ET, and WUE varied by species, region, and agronomic and environmental factors. Averaged across all the geographic locations NT had no effect on the yield, ET, or WUE of wheat in northwestern and northern China, and no effect on the yield or ET of maize, but significantly increased the maize WUE by 5...
April 25, 2018: Science of the Total Environment
Kun Hao, Xiao Gang Liu, Yan Zhang, Zhi Hui Han, Ning Yu, Qi Liang Yang, Yan Wei Liu
The effects of periodic rewatering after drought stress and nitrogen fertilizer on growth, yield, photosynthetic characteristics of leaves and water and nitrogen productivity of Coffea arabica (Katim P7963) were studied under different nitrogen application levels in 2.5 consecutive years. Irrigation (periodic rewatering after drought stress) and nitrogen were designed as two factors, with four modes of irrigation, namely, full irrigation (IF-F : 100%ET0 +100%ET0 , ET0 was reference crop evapotranspiration), rewatering after light drought stress (IL-F : 80%ET0 +100%ET0 ), rewatering after moderate drought stress (IM-F : 60%ET0 +100%ET0 ) and rewatering after severe drought stress (IS-F : 40%ET0 +100%ET0 ), and three levels of nitrogen, namely, high nitrogen (NH : 750 kg N·hm-2 each time), middle nitrogen (NM : 500 kg N·hm-2 each time), low nitrogen (NL : 250 kg N·hm-2 each time), and nitrogen was equally applied for 4 times...
December 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Pablo Imbach, Sin Chan Chou, André Lyra, Daniela Rodrigues, Daniel Rodriguez, Dragan Latinovic, Gracielle Siqueira, Adan Silva, Lucas Garofolo, Selena Georgiou
The objective of this work is to assess the downscaling projections of climate change over Central America at 8-km resolution using the Eta Regional Climate Model, driven by the HadGEM2-ES simulations of RCP4.5 emission scenario. The narrow characteristic of continent supports the use of numerical simulations at very high-horizontal resolution. Prior to assessing climate change, the 30-year baseline period 1961-1990 is evaluated against different sources of observations of precipitation and temperature. The mean seasonal precipitation and temperature distribution show reasonable agreement with observations...
2018: PloS One
Peng Zhan Li, Li Wang, Di Wang
Soil reservoir is the basis of stable grain production and sustainable development in dry farming area. Based on the long-term field experiment, this paper investigated the changes of soil moisture in wheat field located in the rain-fed Changwu Tableland, and analyzed the interannual and annual variation characteristics and dynamics trends of soil reservoir from 2012 to 2015. The results showed that the vertical distribution curves of average soil water content were double peaks and double valleys: first peak and valley occurred in the 10-20 and 50 cm soil layer, respectively, while for the second peak and valley, the corresponding soil layer was the 100 and 280 cm soil layer...
November 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Heather E Golden, Nahal Hoghooghi
Urbanizing environments alter the hydrological cycle by redirecting stream networks for stormwater and wastewater transmission and increasing impermeable surfaces. These changes thereby accelerate the runoff of water and its constituents following precipitation events, alter evapotranspiration processes, and indirectly modify surface precipitation patterns. Green infrastructure, or low-impact development (LID), can be used as a standalone practice or in concert with gray infrastructure (traditional stormwater management approaches) for cost-efficient, decentralized stormwater management...
2018: WIREs. Water
Zhixiang Lu, Yongping Wei, Qi Feng, Jiali Xie, Honglang Xiao, Guodong Cheng
There is limited quantitative understanding of interactions between human and environmental systems over the millennial scale. We aim to reveal the co-evolutionary dynamics of the human-environment system in a river basin by simulating the water use and net primary production (NPP) allocation for human and environmental systems over the last 2000years in Heihe River basin (HRB) in northwest China. We partition the catchment total evapotranspiration (ET) into ET for human and environmental systems with a social-hydrological framework and estimate the NPP for human and environmental systems using the Box-Lieth model, then classify the co-evolutionary processes of the human-environment system into distinct phases using the rate of changes of NPP over time, and discover the trade-offs or synergies relationships between them based on the elasticity of change of the NPP for humans to the change of NPP for environment...
April 17, 2018: Science of the Total Environment
Jianping Gao, Junkui Pan, Ning Hu, Chengzuo Xie
Bioretention can be an effective measure for stormwater treatment. However, there is a lack of systematic analysis of the impact of bioretention design parameters on hydrologic performance. Herein, SWMM and RECARGA models were applied to generate the typical annual rainfall runoff and simulate the water balance of the bioretention system in an expressway service area. The purpose of the investigation was to identify key design parameters for the bioretention system and delineate the priorities in developing the design...
April 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Mustafa Goodarzi, Jahangir Abedi-Koupai, Manouchehr Heidarpour
In this study, the impacts of climate change on crop water requirements and irrigation water requirements on the regional cropping pattern were evaluated using two climate change scenarios and combinations of 20 GCM models. Different models including CROPWAT, MODFLOW and statistical models were used to evaluate the climate change impacts. The results showed that in the future period (2017-2046) the temperature in all months of the year will increase at all stations. The average annual precipitation decline in Isfahan, Tiran, Flavarjan and Lenj stations for RCP 4...
April 15, 2018: Ground Water
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