Towards a greater awareness for drought mitigation in China

2021 ◽  
Author(s):  
Zhen Weng ◽  
Jun Niu ◽  
Wenming Zhang ◽  
Bellie Sivakumar ◽  
Ji Chen ◽  
...  
Keyword(s):  
Drought Mitigation

THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF COCONUT (Cocos nucifera): A REVIEW

2011 ◽  
Vol 47 (1) ◽  
pp. 27-51 ◽  
Author(s):  
M. K. V. CARR
Keyword(s):  
Water Potential ◽  
Water Use ◽  
Water Relations ◽  
Leaf Water Potential ◽  
Water Productivity ◽  
Chloride Ions ◽  
Leaf Water ◽  
Flower Initiation ◽  
Plant Water ◽  
Drought Mitigation

SUMMARYThe results of research on the water relations and irrigation needs of coconut are collated and summarized in an attempt to link fundamental studies on crop physiology to drought mitigation and irrigation practices. Background information on the centres of origin and production of coconut and on crop development processes is followed by reviews of plant water relations, crop water use and water productivity, including drought mitigation. The majority of the recent research published in the international literature has been conducted in Brazil, Kerala (South India) and Sri Lanka, and by CIRAD (France) in association with local research organizations in a number of countries, including the Ivory Coast. The unique vegetative structure of the palm (stem and leaves) together with the long interval between flower initiation and the harvesting of the mature fruit (44 months) mean that causal links between environmental factors (especially water) are difficult to establish. The stomata play an important role in controlling water loss, whilst the leaf water potential is a sensitive indicator of plant water status. Both stomatal conductance and leaf water potential are negatively correlated with the saturation deficit of the air. Although roots extend to depths >2 m and laterally >3 m, the density of roots is greatest in the top 0–1.0 m soil, and laterally within 1.0–1.5 m of the trunk. In general, dwarf cultivars are more susceptible to drought than tall ones. Methods of screening for drought tolerance based on physiological traits have been proposed. The best estimates of the actual water use (ETc) of mature palms indicate representative rates of about 3 mm d−1. Reported values for the crop coefficient (Kc) are variable but suggest that 0.7 is a reasonable estimate. Although the sensitivity of coconut to drought is well recognized, there is a limited amount of reliable data on actual yield responses to irrigation although annual yield increases (50%) of 20–40 nuts palm−1 (4–12 kg copra, cultivar dependent) have been reported. These are only realized in the third and subsequent years after the introduction of irrigation applied at a rate equivalent to about 2 mm d−1 (or 100 l palm−1 d−1) at intervals of up to one week. Irrigation increases female flower production and reduces premature nut fall. Basin irrigation, micro-sprinklers and drip irrigation are all suitable methods of applying water. Recommended methods of drought mitigation include the burial of husks in trenches adjacent to the plant, mulching and the application of common salt (chloride ions). An international approach to addressing the need for more information on water productivity is recommended.

scholarly journals The Use of Pigeon Pea (Cajanus cajan) for Drought Mitigation in Nigeria

2013 ◽  
Vol 1 ◽  
pp. 6-16 ◽  
Author(s):  
M.E. Emefiene ◽  
A.B. Salaudeen ◽  
A.Y. Yaroson
Keyword(s):  
Resource Use ◽  
Cajanus Cajan ◽  
Climate Change Mitigation ◽  
Soil Improvement ◽  
Pigeon Pea ◽  
Widespread Adoption ◽  
Sustainable Resource Use ◽  
Drought Mitigation ◽  
The Tropics ◽  
Change Mitigation

Drought poses one of the most important environmental constraints to plant survival and productivity and by implication-food insecurity in the tropics. Pigeon pea (Cajanus cajan) has the potential of fertilizing the soil thereby improving agricultural production and ensure green environmental and ecosystem stability. Despite the ability of the plant to improve soil fertility and promote greening environment, it has not attracted adequate awareness as a soil improvement plant. This paper highlights the information on the plant in order to intensify awareness for its widespread adoption to achieve the much desired sustainable resource use for greening our economy and environmental management. The successful widespread adoption of the plant will translate to effective drought, desertification and sustainable climate change mitigation approach in Nigeria.

scholarly journals Glacier runoff variations since 1955 in the Maipo River basin, in the semiarid Andes of central Chile

2020 ◽  
Vol 14 (6) ◽  
pp. 2005-2027 ◽  
Author(s):  
Álvaro Ayala ◽  
David Farías-Barahona ◽  
Matthias Huss ◽  
Francesca Pellicciotti ◽  
James McPhee ◽  
...  
Keyword(s):  
Mass Balance ◽  
River Basin ◽  
Climate Scenario ◽  
Glacier Mass Balance ◽  
Time Step ◽  
Ice Melt ◽  
Kinematic Approximation ◽  
Glacier Runoff ◽  
Drought Mitigation ◽  
Year 2000

Abstract. As glaciers adjust their size in response to climate variations, long-term changes in meltwater production can be expected, affecting the local availability of water resources. We investigate glacier runoff in the period 1955–2016 in the Maipo River basin (4843 km2, 33.0–34.3∘ S, 69.8–70.5∘ W), in the semiarid Andes of Chile. The basin contains more than 800 glaciers, which cover 378 km2 in total (inventoried in 2000). We model the mass balance and runoff contribution of 26 glaciers with the physically oriented and fully distributed TOPKAPI (Topographic Kinematic Approximation and Integration)-ETH glacio-hydrological model and extrapolate the results to the entire basin. TOPKAPI-ETH is run at a daily time step using several glaciological and meteorological datasets, and its results are evaluated against streamflow records, remotely sensed snow cover, and geodetic mass balances for the periods 1955–2000 and 2000–2013. Results show that in 1955–2016 glacier mass balance had a general decreasing trend as a basin average but also had differences between the main sub-catchments. Glacier volume decreased by one-fifth (from 18.6±4.5 to 14.9±2.9 km3). Runoff from the initially glacierized areas was 177±25 mm yr−1 (16±7 % of the total contributions to the basin), but it shows a decreasing sequence of maxima, which can be linked to the interplay between a decrease in precipitation since the 1980s and the reduction of ice melt. Glaciers in the Maipo River basin will continue retreating because they are not in equilibrium with the current climate. In a hypothetical constant climate scenario, glacier volume would reduce to 81±38 % of the year 2000 volume, and glacier runoff would be 78±30 % of the 1955–2016 average. This would considerably decrease the drought mitigation capacity of the basin.

Perceptions of Flash Drought in the U.S.: How do End-Users and Researchers Compare?

2021 ◽  
Author(s):  
Tonya Haigh ◽  
Joel Lisonbee ◽  
Marina Skumanich ◽  
Molly Woloszyn
Keyword(s):  
Information System ◽  
Public Engagement ◽  
End Users ◽  
Research Community ◽  
Federal Agencies ◽  
Decision Makers ◽  
Policy Makers ◽  
Drought Mitigation ◽  
Similarities And Differences ◽  
The U.S

<p>Defining flash drought is important not only for the development of the science but also for ensuring clear and useful early warning information to end users. In preparation for a December 2020 U.S-based workshop on flash drought, the National Integrated Drought Information System (NIDIS) and National Drought Mitigation Center (NDMC) undertook a survey of NIDIS contacts to explore how flash drought is understood within and outside of the research community. End users represented in the survey include researchers (outside of flash drought specialty), policy-makers, decision-makers, communicators, and educators and public engagement specialists, largely working within universities or federal agencies across the U.S. Flash drought researchers were asked to describe how they intend for the term “flash drought” to be interpreted when they use it. End users (whether they had heard/used the term before or not) were asked to describe what they think of when they hear the term “flash drought”. Their answers emerged into themes, including: onset/intensification, duration, drivers, impacts, seasonality, predictability, intensity, spatial scale, and uncertainty about its meaning. In this presentation, we will elaborate upon these themes, and discuss similarities and differences in how flash drought researchers and end users conceptualize flash drought.</p>

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