Construction method of sunflower dynamic root distribution model considering various salt and nitrogen levels

Abstract

The present invention relates to a construction method of a sunflower dynamic root system distribution model considering multiple salt and nitrogen levels. The construction method comprises the following steps: observing root system down-growing depth of sunflowers in a growing period under a variety of different salt and nitrogen application levels, and establishing a function of a relationship between the maximum root system depth along time changes under the variety of the salt and nitrogen levels; obtaining measured values of root length density of water-absorbing fine roots of the sunflowers under the variety of the salt and nitrogen levels and establishing a function relationship between root length density distribution of the water-absorbing fine roots of the sunflowers in differentgrowth stages under the variety of the salt and nitrogen levels; and fitting parameters q, p and z<*> in the function of the previous step, then establishing a quantitative relationship between the shape parameters q, p and z<*> and the different salt and nitrogen levels, obtaining the function relationship of the shape parameters q, p and z<*> along with the time changes under the different saltand nitrogen levels, and finally obtaining a dynamic root system distribution function. The dynamic root system distribution function can accurately simulate dynamic root system distribution of actual sunflower growth.

Description

technical field [0001] The invention relates to the technical field of sunflower root growth research, in particular to a construction method of a sunflower dynamic root distribution model considering various levels of salt and nitrogen. Background technique [0002] Soil salinization is one of the important factors threatening global food security, especially in arid and semi-arid regions. The area of ​​arable land affected by soil salinization in my country is about 140 million mu, accounting for 7% of the total arable land in the country, and is widely distributed in important grain-producing areas such as North China, Northwest China and Northeast China. Among them, 68.65% of the cultivated land in the Hetao Irrigation District, which is the largest irrigation district in Asia, is affected by salinization to varying degrees. Soil salinization has become an important limiting factor affecting the growth of crops in this area, seriously restricting the sustainable develop...

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Problems solved by technology

However, this method ignores the changes in root distribution at different growth stages, and cannot reflect the changing situation of crop root growth with changes in soil water and salt conditions.

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