Establishment method for irrigation test system in forest root division zone

Abstract

The invention relates to an establishment method for an irrigation test system in a forest root division zone. Seedlings are adopted as root stocks, the parts, more than 10-12 cm away from the ground, of the root stocks are cut off, opposite faces of two adjacent root stocks are obliquely cut to piths, a branch on a seed tree of tree species to be researched is adopted as a scion, the two sides of the scion are obliquely cut and then grafted into the cut surfaces of the two root stocks, and a grafted seedling can have two complete root systems and one shared scion. A root division cultivation device comprising two plastic basins is assembled, nutrient soil or matrixes, of equal quantity, are filled into the two independent plastic basins, the two complete root systems of the grafted seedling are transplanted into the two plastic basins respectively, the grafted seedling is cultivated, and an irrigation test is carried out on the root division zone at the right moment. According to the method, uneven water supply conditions of a forest root system can be simulated, and alternate irrigation of the root division zone can be simulated for relevant researches. The method is applied to researches on alternate irrigation of the root division zone, drought stress, salt stress and other aspects and has important research and application value.

Description

technical field [0001] The invention relates to a method for establishing a test system for split-root zone irrigation of forest trees. Specifically, splitting the roots is realized through double-stock grafting of forest tree seedlings, and the complete root systems after splitting are planted in two independent culture substrate environments. To study the regulation mechanism of alternate root zone irrigation, drought stress and salt stress on the same plant. Background technique [0002] Alternate root irrigation is a new type of water-saving conditioning and fertilization technology proposed based on the relationship between plant photosynthesis, transpiration dehydration and leaf stomatal opening, root system signal transmission and stomatal regulation under drought conditions, and has been widely used in agriculture and forestry. At present, the application of split-root alternate irrigation technology is relatively single, focusing on crops and some fruit trees that ...

AI Technical Summary

Problems solved by technology

[0003] Forest trees are perennial plants. Generally, the trees are relatively tall, their roots penetrate deep into the soil, and their growth cycle is long. Scientific research takes a long time, covers a large area, and requires a lot of work. There are great difficulties in the study of the physiological response and growth and development regulation mechanism of forest tree positioning irrigation

However, if the research results of photosynthesis characteristics and regulation mechanism under the condition of non-uniform root water supply of other plants are directly applied to perennial trees, sometimes there will be inconsistencies.

For example, most studies have confirmed that roots can synthesize ABA to regulate stomatal closure under drought stress, but other studies have shown that other factors may regulate stomatal opening and closing, rather than ABA.

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