Identification method for salt tolerance of seedling stage of forestation nursery stocks

Abstract

The invention relates to an identification method for the salt tolerance of a seedling stage of forestation nursery stocks. The identification method comprises the following steps: firstly, selectingforestation nursery stock seedlings with relatively consistent growth and development and transplanting the forestation nursery stock seedlings into a pot filled with expanded vermiculite; then irrigating a Hoagland nutrient solution every day and carrying out rain-shielding and light-transmission curing management; recovering the seedlings for 1 to 2 weeks; then preparing stress saline water withdifferent concentrations by taking the Hoagland nutrient solution as a basic solution and adding sodium chloride; carrying out salt stress treatment gradually from low concentration to high concentration; after treatment is finished, shearing over-ground parts of the nursery stocks and weighing and recording; carrying out regression curve estimation analysis on data by applying SPSS to obtain a corresponding curve formula; and after calculating a salt stress attenuation coefficient, calculating a salt tolerance threshold value of the nursery stocks. By adopting the method, the problems in anexisting identification method that the salt distribution of soil is not uniform, water and salt transportation is difficult to control and the like are solved; and the identification method has the advantages that the repeatability of an identification result is strong, the actual salt tolerance capability of the nursery stocks can be accurately judged and the identification method is applicableto the fields including a salt-tolerance new variety of the nursery stocks and the like.

Description

technical field [0001] The invention belongs to the technical field of garden plants, and relates to a method for identifying the salt tolerance of green seedlings at the seedling stage. Background technique [0002] Saline soil is a soil type widely distributed on the earth, which seriously hinders the development of local agriculture and forestry, affects the improvement of ecological environment, and becomes one of the main limiting factors of economic development in saline areas. Planting salt-tolerant plants is one of the effective ways to improve saline soil. To plant salt-tolerant plants, it is first necessary to clarify the salt-tolerant ability of the plants, and it is necessary to accurately identify the salt-tolerant plants. At present, there are various salt-tolerant identification methods used by people, with different standards and their own defects. For example: the field identification method of saline-alkali land has uneven distribution of soil salinity, an...

AI Technical Summary

Problems solved by technology

To plant salt-tolerant plants, it is first necessary to clarify the salt-tolerant ability of the plants, and it is necessary to accurately identify the salt-tolerant plants. At present, there are various salt-tolerant identification methods used by people, with different standards and their own defects.

For example: the field identification method of saline-alkali land has uneven distribution of soil salinity, and it is difficult to find the problem in saline soil that meets the requirements; the saline soil potting method has the problem of difficult water and salt migration control; the hydroponic salt-tolerant identification has some plant roots that cannot breathe, causing the root system to rot easily The problem

The identification results of the above methods are quite different, and the repeatability is poor, so it is difficult to accurately determine the actual salt tolerance of seedlings

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