Evaluation of relative water use efficiency (RWUE) at a regional scale: a case study of Tuhai-Majia Basin, China

2012 ◽  
Vol 66 (5) ◽  
pp. 927-933 ◽  
Author(s):  
Yao-Huan Huang ◽  
Dong Jiang ◽  
Da-Fang Zhuang ◽  
Jian-Hua Wang ◽  
Hai-Jun Yang ◽  
...  
Keyword(s):  
Land Use ◽  
Water Use Efficiency ◽  
Water Use ◽  
Regional Scale ◽  
Land Development ◽  
Accurate Estimation ◽  
Wetland Protection ◽  
Unused Land ◽  
Relative Water ◽  
Use Efficiency

Enhancing water use efficiency (WUE) is the key approach to maintain sustainable water resource supply. Due to the complexity of the water cycle, accurate estimation of WUE at the regional scale is a challenging task. Here we presented a framework of relative water use efficiency (RWUE). According to the linkage between RWUE and land use types, assessment of WUE at a regional scale could be performed operationally. This approach was evaluated in a study area, Tuhai-Majia Basin, North China. Based on remote sensing-derived evapotranspiration (ET) and land use data, regional WUE were assessed accordingly. The mean RWUE of agriculture, ecosystem and total basin in 2005 was 60.12, 30.07 and 62.5%, respectively. Spatial analysis showed that the agricultural WUE played the dominant role in water-saving of the study area; water management of unused land (RWUE of 2005 was 5.46%), especially wetland protection and other unused land development, will contribute significantly to ecological RWUE improvement. Temporal analysis indicated that there was considerable inter-annual variability in RWUE time series profiles. The agricultural interlude period might be important for enhancing WUE in the Tuhai-Majia Basin. In general, the results indicated that the RWUE-based method was an efficient and simple method to evaluate WUE at regional scale.

scholarly journals Calcium and Potassium Nutrition Increases the Water Use Efficiency in Coffee: A Promising Strategy to Adapt to Climate Change

Hydrology ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 75
Author(s):  
Victor Hugo Ramírez-Builes ◽  
Jürgen Küsters
Keyword(s):  
Climate Change ◽  
Climate Variability ◽  
Water Use Efficiency ◽  
Water Use ◽  
Agricultural Sector ◽  
Regional Scale ◽  
Adaptation Strategies ◽  
Caribbean Region ◽  
Coffee Production ◽  
Use Efficiency

Coffee (Coffea spp.) represents one of the most important sources of income and goods for the agricultural sector in Central America, Colombia, and the Caribbean region. The sustainability of coffee production at the global and regional scale is under threat by climate change, with a major risk of losing near to 50% of today’s suitable area for coffee by 2050. Rain-fed coffee production dominates in the region, and under increasing climate variability and climate change impacts, these production areas are under threat due to air temperature increase and changes in rainfall patterns and volumes. Identification, evaluation, and implementation of adaptation strategies for growers to cope with climate variability and change impacts are relevant and high priority. Incremental adaptation strategies, including proper soil and water management, contribute to improved water use efficiency (WUE) and should be the first line of action to adapt the coffee crop to the changing growing conditions. This research’s objective was to evaluate at field level over five years the influence of fertilization with calcium (Ca+2) and potassium (K+) on WUE in two coffee arabica varieties: cv. Castillo and cv. Caturra. Castillo has resistance against coffee leaf rust (CLR) (Hemileia vastatrix Verkeley and Brome), while Caturra is not CLR-resistant. WUE was influenced by yield changes during the years by climate variability due to El Niño–ENSO conditions and CLR incidence. Application of Ca+2 and K+ improved the WUE under such variable conditions. The highest WUE values were obtained with an application of 100 kg CaO ha−1 year−1 and between 180 to 230 kg K2O ha−1 year−1. The results indicate that adequate nutrition with Ca+2 and K+ can improve WUE in the long-term, even underwater deficit conditions and after the substantial incidence. Hence, an optimum application of Ca+2 and K+ in rain-fed coffee plantations can be regarded as an effective strategy to adapt to climate variability and climate change.

Climate and land use controls over terrestrial water use efficiency in monsoon Asia

Ecohydrology ◽  
2011 ◽  
Vol 4 (2) ◽  
pp. 322-340 ◽  
Author(s):  
Hanqin Tian ◽  
Chaoqun Lu ◽  
Guangsheng Chen ◽  
Xiaofeng Xu ◽  
Mingliang Liu ◽  
...  
Keyword(s):  
Land Use ◽  
Water Use Efficiency ◽  
Water Use ◽  
Monsoon Asia ◽  
Terrestrial Water ◽  
Use Efficiency ◽  
Land Use Controls

Ecosystem Water-Use Efficiency of Annual Corn and Perennial Grasslands: Contributions from Land-Use History and Species Composition

Ecosystems ◽  
2016 ◽  
Vol 19 (6) ◽  
pp. 1001-1012 ◽  
Author(s):  
Michael Abraha ◽  
Ilya Gelfand ◽  
Stephen K. Hamilton ◽  
Changliang Shao ◽  
Yahn-Jauh Su ◽  
...  
Keyword(s):  
Land Use ◽  
Species Composition ◽  
Water Use Efficiency ◽  
Water Use ◽  
Land Use History ◽  
Ecosystem Water Use Efficiency ◽  
Use Efficiency

Polyamines in relation to metal concentration, distribution, relative water content and abscisic acid in wheat plants irrigated with waste water heavily polluted with heavy metals

2016 ◽  
Vol 5 (05) ◽  
pp. 4534 ◽  
Author(s):  
Heshmat Soliman Aldesuquy
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Abscisic Acid ◽  
Water Use Efficiency ◽  
Water Content ◽  
Water Use ◽  
Relative Water Content ◽  
Relative Water ◽  
Use Efficiency ◽  
Growth Vigor

Present study was carried out in order to investigate the effect of grain presoaking in spermine (0.15 mM), spermidine (0.3 mM) and their interaction on growth vigor, metal distribution as well as leaf turgidity and abscisic acid in wheat plants. Waste water at concentrations 25%, 50% and 100% caused noticeable decreases in growth vigor of root and shoot, leaf area, relative water content and water use efficiency. On the other hand, waste water stress caused remarkable increases in heavy metals and saturation water deficit as well as abscisic acid content of flag leaf. Exogenous application of Spm, Spd or their interaction could counteract the adverse effects of heavy metals in waste water by improving growth vigor of root and shoot, water use efficiency, retention of leaf turgidity and decreasing abscisic acid in leaves and grains. Furthermore, these polyamines reduced heavy metals translocation from root to leaves till reach to grains.

scholarly journals Land‐use legacies influence tree water‐use efficiency and nitrogen availability in recently established European forests

2021 ◽  
Author(s):  
Rossella Guerrieri ◽  
Marta Correia ◽  
Irene Martín‐Forés ◽  
Raquel Alfaro‐Sánchez ◽  
Joan Pino ◽  
...  
Keyword(s):  
Land Use ◽  
Water Use Efficiency ◽  
Water Use ◽  
Nitrogen Availability ◽  
European Forests ◽  
Tree Water Use ◽  
Use Efficiency ◽  
Land Use Legacies

scholarly journals Response of bell pepper crop subjected to irrigation depths calculated by different methodologies

2018 ◽  
Vol 22 (1) ◽  
pp. 45-50
Author(s):  
Gustavo H. da Silva ◽  
Mariane G. Ferreira ◽  
Silvio B. Pereira ◽  
Fábio T. Delazari ◽  
Derly J. H. da Silva
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Block Design ◽  
Irrigation Management ◽  
Fruit Production ◽  
Accurate Estimation ◽  
Randomized Block Design ◽  
Irrigation Depth ◽  
Growth Production ◽  
Use Efficiency

ABSTRACT Water must be supplied to a crop in the proper amount and in a timely manner. Vegetables require a good water availability in soil during their entire cycle. Thus, it is very important the implementation of an irrigation management and accurate estimation of water requirement. The objective of this work was to evaluate the effect of five irrigation depths estimated by the dual-Kc and single-Kc methodologies on the characteristics of growth, production and water use efficiency in the pepper crop. A randomized block design was adopted in a split plot arrangement. The effect of five irrigation depths (50, 75, 100, 125 and 150% of crop evapotranspiration - ETc) was evaluated in the plots, and the methodologies were evaluated in the subplots. It was evaluated the root dry matter, total fruit production, leaf temperature, number of aborted flowers and water use efficiency. The interaction between both effects was not significant for any of the variables. The effect of methodology was observed only on the number of aborted flowers. The effect of the irrigation depths was significant on all variables. The irrigation depths that lead to the best agronomic characteristics were superior to 100% of ETc. The ratio between the irrigation depths estimated by single-Kc and dual-Kc methodologies was 1.14. Single-Kc methodology and irrigation depth of 143% ETc were more suitable for the horticulturist. The most efficient irrigation depth in the use of water was 105% ETc.

scholarly journals Monitoring Spatio-Temporal Changes of Terrestrial Ecosystem Soil Water Use Efficiency in Northeast China Using Time Series Remote Sensing Data

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1481 ◽  
Author(s):  
Hang Qi ◽  
Fang Huang ◽  
Huan Zhai
Keyword(s):  
Time Series ◽  
Soil Moisture ◽  
Water Use Efficiency ◽  
Soil Water ◽  
Water Use ◽  
Northeast China ◽  
Regional Scale ◽  
Positive Effects ◽  
Use Efficiency ◽  
Spatio Temporal

Soil water use efficiency (SWUE) was proposed as an effective proxy of ecosystem water use efficiency (WUE), which reflects the coupling of the carbon–water cycle and function of terrestrial ecosystems. The changes of ecosystem SWUE at the regional scale and their relationships with the environmental and biotic factors are yet to be adequately understood. Here, we aim to estimate SWUE over northeast China using time-series Moderate Resolution Imaging Spectroradiometer (MODIS) gross primary productivity data and European Space Agency climate change initiative (ESA CCI) soil moisture product during 2007–2015. The spatio-temporal variations in SWUE and their linkages to multiple factors, especially the phenological metrics, were investigated using trend and correlation analysis. The results showed that the spatial heterogeneity of ecosystem SWUE in northeast China was obvious. SWUE distribution varied among vegetation types, soil types, and elevation. Forests might produce higher photosynthetic productivity by utilizing unit soil moisture. The seasonal variations of SWUE were consistent with the vegetation growth cycle. Changes in normalized difference vegetation index (NDVI), land surface temperature, and precipitation exerted positive effects on SWUE variations. The earlier start (SOS) and later end (EOS) of the growing season would contribute to the increase in SWUE. Our results help complement the knowledge of SWUE variations and their driving forces.

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