Evaluation on Early Drought Warning System in the Jinghui Channel Irrigation Area

Abstract

With the economic growth, continuous global environment deterioration, and increasingly serious water resources shortage, droughts have become more and more serious and produced great impacts on both the regional ecology and sustainable economic development. This paper has established the “green, blue, yellow, orange, and red lights” as the early warning grades for agricultural droughts. By using the two influencing factors, namely precipitation and soil moisture, this paper has established the drought assessment index evaluation model using weighted coupling method. It has carried out the analogue simulation of the early drought warning based on the Jinghui Channel’s 2013 water source situations. The soil moisture in January and February is relatively ideal, and the actual early drought warning is expressed by the “green light”. The soil moisture deficit is comparatively serious in March, but the situation concerning water inflow is ideal with the “green light”. Actually, the early warning signal is basically consistent with the soil moisture drought degree between April and August. The actual early warning is expressed by the “green light” as well, but the soil moisture is not so ideal, however, this is the seeding time of the winter wheat so the lack of soil moisture has no impact on the crops output. In November and December, the winter wheat is at the growth and development stage and does not need much moisture. At this stage, the soil moisture is relatively poor. By integrating the time effects into the early drought warning system, this paper provides administrators of irrigation areas with a scientific decision-making based on the drought control measures.

Ecological Water Requirement in Upper and Middle Reaches of the Yellow River Based on Flow Components and Hydraulic Index

“…The core idea of ecological water requirements coupling is to obtain the flow duration curve to meet the multiple functional needs of the ecological water requirements [43][44][45]. The principles of ecological water requirements coupling are 1 the general consideration of the whole stream segment: carry out the integration of important fracture surface flow; it should take such factors as the matching and flow routing of flows between high and low fracture surfaces and then make the coupling after comprehensive optimization; 2 the consideration of water in taking and water loss: there are lots of water intakes at the mainstream of the Yellow River and their distribution is complicated.…”

Influence of irrigation and weather conditions on the duration of interphase periods of winter wheat varieties

“…During abiotic stresses, physiological and biochemical changes in cells suppress plant growth and development, which ultimately reduces wheat yield. To ensure the food and nutritional security of the ever-growing world population, new approaches are needed for sustainable wheat production in the face of climate change, one of which is the creation of wheat varieties resistant to abiotic stress through molecular selection, rapid selection, genetic engineering, and improvement of existing technologies [11].…”